2025/01/30 更新

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写真a

アダチ チハヤ
安達 千波矢
ADACHI CHIHAYA
所属
工学研究院 応用化学部門 教授
■廃止組織■ 分子システムデバイス産学連携教育研究センター(併任)
■廃止組織■ 水素製造研究部門(併任)
最先端有機光エレクトロニクス研究センター (併任)
未来化学創造センター (併任)
工学部 応用化学科(併任)
工学府 応用化学専攻(併任)
職名
教授
連絡先
メールアドレス
電話番号
0928026920
プロフィール
有機光エレクトロニクス材料・デバイスに関する研究開発-有機EL,有機トランジスタ,有機太陽電池,有機レーザーなどの有機半導体デバイスの材料設計・合成から光物性デバイス物理の解明まで取り組んでいる。
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外部リンク

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 電子デバイス、電子機器

  • ナノテク・材料 / 基礎物理化学

  • ナノテク・材料 / 応用物性

  • ナノテク・材料 / 結晶工学

学位

  • 博士(工学)

経歴

  • 国立大学法人 九州大学大学院工学研究院  教授 

    2010年 - 現在

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  • 国立大学法人 九州大学最先端有機光エレクトロニクス研究センター  センター長 

    2010年 - 現在

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  • 国立大学法人 九州大学未来化学創造センター  教授 

    2005年 - 現在

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  • 千歳科学技術大学  教授 

    2004年 - 2005年

  • 千歳科学技術大学  助教 

    2001年 - 2004年

  • プリンストン大学 電気工学科  研究員  

    1999年 - 2001年

  • 信州大学  助手 

    1996年 - 1999年

  • 株式会社リコー 化成品技術研究所  R&D Center  Research Scientist /Polymer Science, Research Associate 

    1991年 - 1996年

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学歴

  • 九州大学   Graduate School, Division of Integrated Science and Engineering  

    - 1991年

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  • 九州大学   総合理工学研究科   材料開発工学

    - 1991年

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    国名:日本国

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  • 中央大学   Faculty of Science and Engineering   Department of Physicis

    - 1986年

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  • 中央大学   理工学部   物理

    - 1986年

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    国名:日本国

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研究テーマ・研究キーワード

  • 研究テーマ: 「有機エレクトロニクス材料・デバイス物理の解明」

    研究キーワード: 有機EL,有機トランジスタ,有機太陽電池,有機レーザーダイオード、有機超伝導体

    研究期間: 2005年10月

受賞

  • Highly Cited Researchers 2024

    2025年1月   クラリベイト・アナリティクス社  

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  • Highly Cited Researchers 2023

    2024年1月   クラリベイト・アナリティクス社  

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    2012年にNatureに発表後、世界を先導して開発を進めてきた熱活性化遅延蛍光(TADF)の科学技術が高く評価された。本研究成果が、物理の根幹に係わる学理の開拓に繋がっていることを実証している。

  • 第56回 市村学術賞 功績賞

    2024年   公益財団法人 市村清新技術財団   高効率熱活性化遅延蛍光分子の創製とOLEDへの展開

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  • 紫綬褒章

    2023年4月   内閣府  

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    黎明期における世界初の電子輸送材料の発見によるOLED の基本構造の構築、熱活性化遅延蛍光(TADF:Thermally activated delayed fluorescence)技術の開拓は特筆すべき研究業績であり、材料化学、光化学、物性物理の学理の深化とともに、実社会におけるディスプレイ産業の振興にも多大な貢献を果たしたことなどが高く評価された。

  • 第38回(2022 年度) 櫻井健二郎氏記念賞

    2023年2月   一般財団法人光産業技術振興協会(OITDA)   高効率有機発光材料の創製と光デバイスへの応用

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    大型テレビなどに用いられている有機発光ダイオード(OLED)の研究開発に黎明期から携わり、電子輸送層を有するダブルヘテロ構造をいち早く提案するとともに、発光層に従来の蛍光材料に替えて燐光材料を用いれば内部量子効率がほぼ100%となることを実証した。また、分子設計の自由度が大きく、レアメタル・フリーな熱活性化遅延蛍光材料を創製し、ほぼ100%の内部量子効率のOLEDを実現した。さらに、色純度を上げて色域を広げた OLED の開発や有機半導体レーザーへの挑戦にも意欲的に取り組んできている。
    このように、有機分子の発光についての深い知見と洞察に基づき、高効率な有機発光材料を創製することにより、OLEDの学術的基盤の構築に貢献するとともに、その実用化に向けた研究開発を主導し、我が国の光産業とりわけディスプレイ分野の発展に貢献しており、本賞に相応しい業績と考える。

  • Highly Cited Researchers 2022

    2023年1月   クラリベイト・アナリティクス社  

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    2012年にNatureに発表後、世界を先導して開発を進めてきた熱活性化遅延蛍光(TADF)の科学技術が高く評価された。本研究成果が、物理の根幹に係わる学理の開拓に繋がっていることを実証している。

  • 2022年(第92回)服部報公会「報公賞」

    2022年10月   公益財団法人服部報公会   「熱活性化遅延蛍光分子の創成と高効率OLEDの実現」

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    有機発光ダイオード(有機 EL, OLED)は、スマートフォンやタブレット端末の小型ディスプレイから大型 TV の画面に至るまで幅広い先端電子デバイスにおいて実用化が進んでいる。1990 年代後半から、第二世代の発光分子として白金やイリジウム等を含有する有機金属錯体の研究が盛んに行われ実用化に至っているが、分子設計の自由度の低さや高コスト、更には希少資源などの問題を抱えていた。
    これに対して、熱活性化遅延蛍光(TADF)に着目し、緻密な量子化学計算と巧みな分子設計によって、100%の内部量子効率を単純な芳香族化合物によって実現した。高効率の TADF を実現するために、励起一重項エネルギーと励起三重項エネルギーの差が小さい(100 meV 以下)化合物を設計して、通常ではスピン状態が異なるために遷移確率の低い励起三重項状態から励起一重項状態への遷移を熱的に可能とした(変換効率 100%)。この新規分子を発光層に用いた OLED において、電流励起によって得られた励起三重項状態を励起一重項状態に変換することによって、100%の内部量子効率を有する OLED を実現している。TADF 分子は比較的単純な芳香族化合物であることから、世界的にも多くの研究が追随された(論文の引用回数の多さが物語っている)。
    また、従来開発が困難であった青色発光 TADF 分子の開発にも成功しており、さらに、TADF の派生技術として1時間以上の連続発光が可能な有機蓄光現象など、有機電荷移動(CT)状態の精密制御によって新基軸の開拓に繋がっている。
    以上のように、理論に基づいた分子設計によって実用可能なエレクトロニクス材料を創出しており、学術的にも工業的にも高いレベルであると判断される。特に、有機CT 状態の精密制御がデバイス性能の向上に重要であることを体系的に明らかにしたことは、有機デバイス分野の発展に大きく貢献した。Nature およびその姉妹誌に掲載された論文の引用数(TADF の論文は 5000 件)(総論文の引用数は 75571 件)は群を抜いており、376 件の特許出願も注目に値する。また、実用化に関しては、九大発のベンチャー((株)Kyulux)が設立され、世界初の TADF 材料を用いた OLED パネルが台湾の企業(WiseChip 社)から上市され、実用化に至っている。

  • 第22回(2021年度)応用物理学会業績賞

    2022年3月   応用物理学会   革新的な材料創成による有機発光デバイスの高性能化

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    革新的な材料創成による有機発光デバイスの高性能化

    有機発光ダイオード(Organic Light-Emitting Diode: OLED,あるいは,有機EL)は,1990年代後半からカーナビゲーション用ディスプレイとしての製品化が始まり,2010年代からスマートフォン,大型テレビ,医療機器,車載パネル,照明パネル等,産業的に大きな広がりを示している。1980年代後半の黎明期から現在に至るまで一貫してOLEDの研究に取り組み,OLEDの設計指針を示し,新規発光材料を設計・合成することで,当該分野を先導する革新的な成果を挙げた。

    OLEDの発光原理は,蛍光(第1世代),燐光(第2世代),熱活性化遅延蛍光(TADF)(第3世代)である。全ての世代で,重要な役割を果たした。第1世代のOLEDは当初,電子輸送層・発光層/正孔輸送層の二層構造であったが,電子輸送層/発光層/正孔輸送層なるダブルヘテロ構造により高効率化を実現した。ダブルヘテロ構造はその後のOLEDの基本構造となった。

    第1世代の蛍光OLEDの内部量子効率は25%程度であったが,燐光材料を発光層に用いたダブルヘテロ構造OLEDにより,内部量子効率が100%となること実証し,第2世代燐光OLEDの有用性を示した。この後,TADFを発現する分子群を設計・合成し,燐光材料とは異なるレアメタルを含有しない比較的単純な芳香族化合物でありながら内部量子効率100%の第3世代TADF OLEDを実現した。究極のOLED発光材料としての地位を確立し,多数の研究活動を触発している。さらに,TADF材料に蛍光材料を添加した第4世代OLEDにおいて,TADF材料と同等な内部量子効率を有する高色純度を実現している。

    また、TADF OLEDに関する100件を超える特許出願を行い,それをもとに2015年に九州大学発ベンチャーである(株) Kyulux を設立している。

  • Highly Cited Researchers 2021

    2022年1月   クラリベイト・アナリティクス社  

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    2012年にNatureに発表後、世界を先導して開発を進めてきた熱活性化遅延蛍光(TADF)の科学技術が高く評価された。特に今年度は物理分野での選定であり、本研究成果が、物理の根幹に係わる学理の開拓に繋がっていることを実証している。

  • Highly Cited Researchers 2020

    2021年1月   クラリベイト・アナリティクス社  

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    2012年にNatureに発表後、世界を先導して開発を進めてきた熱活性化遅延蛍光(TADF)の科学技術が高く評価された。特に今年度は物理分野での選定であり、本研究成果が、物理の根幹に係わる学理の開拓に繋がっていることを実証している。

  • 応用物理学会優秀論文賞

    2020年9月   応用物理学会  

  • Highly Cited Researchers 2019

    2020年1月   クラリベイト・アナリティクス社  

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    2012年にNatureに発表後、世界を先導して開発を進めてきた熱活性化遅延蛍光(TADF)の科学技術が高く評価された。

  • 第24回名古屋メダル「シルバーメダル」

    2019年2月   公益財団法人MSD生命科学財団  

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    2012年にNature誌に発表し、その後、世界を先導して研究開発を進めてきた熱活性化遅延蛍光(TADF)の研究成果が基礎学術の視点(化学の新しい学理の開拓)から広く認められた。

  • Highly Cited Researchers 2018

    2019年1月   クラリベイト・アナリティクス社  

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    2012年にNature誌に発表し、その後、世界を先導して研究開発を進めてきた熱活性化遅延蛍光(TADF)の研究成果が広く認められたことを意味している。

  • 文部科学大臣表彰 科学技術賞

    2018年4月   文部科学省   熱活性化遅延蛍光分子の創成とOLEDの高効率化の研究

  • 仁科記念賞

    2017年11月   仁科記念財団  

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    100%の三重項励起子の励起一重項状態への遷移が実現された。これにより、100%の電流ー光変換を実現する高効率有機EL素子の実現のみならず、分子励起子のスピン状態の基礎的な理解が進み、分子物性物理学にも大きな貢献を果たした。

  • 応用物理学会 第10回(2016年度)フェロー表彰

    2016年9月   応用物理学会  

  • トムソン・ロイター Research Front Award

    2016年7月   トムソンロイター  

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    作業中

  • SID Fellow Awards

    2014年5月   SID  

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    【受賞コメント】TADFは骨格を限定せず、有機材料設計の無限の可能性を生かした分子設計が可能であるため、RGB全ての色において、高効率な材料の創出が可能となります。今後、有機ELの新しいアプリケーションが各企業から販売され身近なものになるに伴って、TADF材料が世界中で使われ、有機ELの世界的普及に貢献できることを願っております。

  • 有機EL討論会第6回業績賞

    2013年3月   有機EL討論会  

  • Best Poster Award

    2010年11月   ACOE2010   Nanocrystal growth and improved performance of small molecule bulk heterojunctions solar cells

  • 文部科学大臣表彰 科学技術賞

    2007年4月   文部科学省   有機ELの技術の振興

  • nano-tech 2004 国際ナノテクノロジー総合展・技術会議 ナノテック大賞IT・エレクトロニクス部門受賞

    2004年3月   nano-tech 2004  

  • 第1回 応用物理学会 有機分子・バイオエレクトロニクス分科会 論文賞

    2003年7月   応用物理学会   “有機ELに関する研究”

  • 千歳科学技術大学教育研究貢献賞受賞

    2003年3月   千歳科学技術大学  

  • 第2回 船井情報科学振興財団振興賞 エレクトロニクス部門

    2003年3月   船井情報科学振興財団   “高効率有機エレクトロルミネッセンス(有機EL)素子の研究開発”

  • Outstanding paper award and presentation award

    1989年   The 9th International Display Research conference  

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論文

  • Investigation and modulation of charge transport properties with thin films of an isoindigo-based donor-acceptor molecular semiconductor

    Liu X., Placide V., Chu L., Haidaraly K.M., Sosa Vargas L., Adachi C., Wu J.W., Heinrich B., Lacaze E., Yan W., D'Aléo A., Mathevet F.

    Applied Surface Science   686   162057 - 162057   2025年3月   ISSN:0169-4332

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Applied Surface Science  

    Charge mobility plays a crucial role in determining the performance of organic semiconducting devices. Organic semiconductors (OSCs) based on donor–acceptor (D-A) small molecules generally have planar backbones that facilitate charge transport. However, their hole transport property in thin film transistors (TFTs) still required to be further improved, and simultaneously achieving electron transport alongside hole transport remains a great challenge due to the presence of electron traps on the substrate surface. In this study, an isoindigo-based oligothiophene that is a D-A small molecule, was synthesized and employed as an active layer in TFTs. The impact of thermal annealing on the structure, morphology and charge transport properties of its thin films was investigated. By implementing a facile surface engineering, electron traps on the SiO2 dielectric surface were effectively eliminated. As a result, the charge transport behavior in the TFTs was successfully transformed from solely p-type to ambipolar characteristics. This accomplishment holds great significance for the advancement of optoelectronic devices in which both p-type and n-type conduction are harnessed.

    DOI: 10.1016/j.apsusc.2024.162057

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  • Thermally activated delayed fluorescence properties of through-space charge-transfer-type organic molecule depending on solvent polarity 査読

    Lee S.H., Auffray M., Tsuchiya Y., Adachi C.

    Chemical Physics Letters   861   141835 - 141835   2025年2月   ISSN:0009-2614

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Chemical Physics Letters  

    We investigate the photophysical properties of a newly synthesized molecule, 2PhCz-3PhTrz-DMeCz, which has two phenyl carbazole (PhCz) donors and a triphenyl triazine (3PhTrz) acceptor connected by a dimethyl carbazole (DMeCz) spacer. This architecture enables both through-bond charge-transfer (TBCT) and through-space CT (TSCT) interactions. In polar solvents, the molecule exhibits enhanced photoluminescence quantum yield (PLQY) and reverse intersystem crossing rate (kRISC). Theoretical calculations show that polar solvents reduce the dihedral angle between PhCz and DMeCz in the excited states, increasing hole delocalization across the molecule. Our finding highlights that the conformational change of the target molecule is strongly influenced by the solvent polarity, resulting in distinct photophysical behavior.

    DOI: 10.1016/j.cplett.2024.141835

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  • Advancing efficiency in deep-blue OLEDs: Exploring a machine learning-driven multiresonance TADF molecular design.

    Kim HS, Cheon HJ, Lee SH, Kim J, Yoo S, Kim YH, Adachi C

    Science advances   11 ( 4 )   eadr1326   2025年1月

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    記述言語:英語  

    DOI: 10.1126/sciadv.adr1326

    PubMed

  • White light-emitting electrochemical cells based on metal-free TADF emitters 査読

    Shi Tang; Youichi Tsuchiya; Jia Wang; Chihaya Adachi; Ludvig Edman

    16 ( 653 )   2025年1月

  • Regioisomer Effect of Pyrene on Multi-Resonance Emitters and Their Application for Hyperfluorescence Organic Light-Emitting Diodes 査読

    Lee, CH; Lee, YT; Chan, CY; Park, CW; Lee, SH; Kwon, HI; Boo, D; Tsuchiya, Y; Lee, SY; Adachi, C

    ADVANCED OPTICAL MATERIALS   2024年12月   ISSN:2195-1071 eISSN:2195-1071

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Advanced Optical Materials  

    Multiple-resonance (MR) type emitters have overcome several issues in organic light-emitting diodes (OLEDs) because of their narrowband emission and high electroluminescence quantum yield efficiency. Also, this kind of emitters has been widely used as hyperfluorescence (HF)-OLEDs thanks to their advantageous properties. However, there has been a significant challenge for HF-OLEDs based on MR emitters, which is impacted by the nature of the long-lived triplet excitons of MR emitters, as there is a trade-off between narrowband emission and short exciton lifetime. Herein, the low-possessed triplet energy level of pyrene is introduced to an MR core unit to achieve stable HF-OLEDs with the development of three isomers to investigate the regioisomer effect of pyrenes. The improved device lifetimes are successfully achieved, and the reasons for the differences in excimer formation and stability between those three isomers are studied.

    DOI: 10.1002/adom.202402862

    Web of Science

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  • Rational Molecular Design for Balanced Locally Excited and Charge- Transfer Nature for Two-Photon Absorption Phenomenon and Highly Efficient TADF-Based OLEDs 査読

    Mageswari, GV; Chitose, Y; Tsuchiya, Y; Lin, JH; Adachi, C

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   e202420417   2024年12月   ISSN:1433-7851 eISSN:1521-3773

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Angewandte Chemie - International Edition  

    The pursuit of highly efficient thermally activated delayed fluorescence (TADF) emitters with two-photon absorption (2PA) character is hampered by the concurrent achievement of a small singlet-triplet energy gap (ΔEST) and high photoluminescence quantum yield (ΦPL). Here, by introducing a terephthalonitrile unit into a sterically crowded donor-π-donor structure, inducing a hybrid electronic excitation character, we designed unique TADF emitters possessing 2PA ability. This rational molecular design was achieved through a main π-conjugated donor-acceptor-donor backbone in line with locally excited feature renders a large oscillator strength and transition dipole moment, maintaining a high 2PA cross-section value. The ancillary N-donor-acceptor-donor with charge transfer character highly balances the TADF phenomenon by minimizing ΔEST. A near-unity ΦPL value with a large radiative decay rate over an order of magnitude higher than the intersystem crossing rate and a high horizontal orientation ratio of 0.95 were simultaneously attained for TPCz2NP. The organic light-emitting diodes fabricated with this material exhibit a high maximum external quantum efficiency of 25.4 % with an elevated 2PA cross-section (σ2) value up to 143 GM at 850 nm. These findings offer a venue for designing high-performance TADF emitters with exceptional performance inclusive of 2PA properties, expanding for future functional material design.

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  • Electron Transport in Soft-Crystalline Thin Films of Perylene Diimide Substituted with Swallow-Tail Terminal Alkyl Chains 査読

    Sleczkowski, P; Xiao, YM; Wu, JW; Adachi, C; Vargas, LS; Kreher, D; Heinrich, B; Ribierre, JC; Mathevet, F

    JOURNAL OF PHYSICAL CHEMISTRY C   128 ( 51 )   21826 - 21835   2024年12月   ISSN:1932-7447 eISSN:1932-7455

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Physical Chemistry C  

    We have examined the structural and electron transport properties of a swallow-tailed N,N’-bis(1-heptyloctyl)-perylene-3,4:9,10-bis(dicarboximide) (PDI-C8,7) in thin films. A comprehensive analysis of material with the use of X-ray scattering methods evidenced the appearance of a new soft-crystalline mesophase that was induced by thermal processing of the swallow-tail PDI derivative. By combining electrical measurements with grazing-incidence wide-angle X-ray scattering (GIWAXS), we show that these morphological changes of thin films boost their charge transport in the organic field-effect transistor (OFET) configuration. The systematic device engineering of OFETs, including device architecture, thermal history, and preparation method of the active layer, resulted in a significant improvement in the electron field-effect mobility and the related performance parameters. In particular, the results demonstrate a strong improvement in the charge transport of PDI-C8,7 films in their soft-crystalline phase, which originates from the N-substitution by swallow-tails. In addition, our study demonstrates that the melt-processing route, a solvent-free and vacuum-free method for the fabrication of organic thin films, represents an efficient strategy for the fabrication of high-performance air-stable n-type OFETs.

    DOI: 10.1021/acs.jpcc.4c06222

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  • Dynamic Luminescence Vapochromism of Pyridinium-Based Organic Salts

    Sääsk, V; Abe, A; Kametani, Y; Shiota, Y; Sato, O; Adachi, C

    CHEMISTRY-A EUROPEAN JOURNAL   30 ( 69 )   e202402777   2024年12月   ISSN:0947-6539 eISSN:1521-3765

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    記述言語:英語   出版者・発行元:Chemistry - A European Journal  

    Organic vapochromic materials which undergo a drastic change in their photophysical properties upon exposure to vapors or gases are attracting growing scientific attention because of their low price and wide range of possible applications. In this work, luminescence vapochromism of carbazole-pyridinium-based organic salts with a general structure of (CzPy)X (CzPy+=2,3-di(9H-carbazol-9-yl)pyridinium ion; X=Cl, Br or I) is reported. It was found that (CzPy)X compounds form J-aggregates, which rearranged back to monomeric form upon exposure to methanol, ethanol, acetone, and water vapors. In contrast, acetonitrile was found to promote the J-aggregation in (CzPy)X compounds by occupying the voids in their crystal lattice and pushing cations closer together. It was further demonstrated that the efficiency of J-aggregation in (CzPy)X compounds depends on the size of the anion, which was employed to realize dynamic luminescence vapochromism, with vapochromic response times ranging from a couple of minutes in (CzPy)Cl to more than an hour in (CzPy)I. In addition, (CzPy)X compounds exhibited high melting points of about 250 °C and excellent thermal stability. (CzPy)Cl and (CzPy)Br have also shown good photoluminescence quantum yields at room temperature in a solid state.

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  • Anti-Stokes Emission Utilizing Reverse Intersystem Crossing 査読

    Kohata, S; Nakanotani, H; Hosokai, T; Yasuda, T; Tsuchiya, Y; Adachi, C

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   e202419323   2024年11月   ISSN:1433-7851 eISSN:1521-3773

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    Photon‐upconversion (PUC) processes in organic molecular systems, such as triplet‐triplet upconversion and hot‐band absorption, are promising technologies for future energy harvesting. Although these processes can generate high‐energy excitons compared to excitation energy, a PUC process with a high yield and no energy loss has not been established and, therefore, is highly desired. Here, we propose an alternative PUC mechanism that uses reverse intersystem crossing on thermally activated delayed fluorescence (TADF) molecules. This process combines a triplet sensitizer and a TADF molecule, generating a triplet in the former and transferring it to the latter. Specifically, the triplet energy transfer from Ir(ppy)3 (sensitizer) to CzBSe (TADF) results in anti‐Stokes emission with an anti‐Stokes energy of 0.18 eV. We found that the triplet energy transfer rate strongly depends on the triplet radiative decay rate of TADF molecules and the difference in Gibbs energy between the energy acceptor and donor. Our findings will contribute to understanding triplet energy transfer dynamics in organic energy donor‐acceptor systems and will lead to various applications, such as future optical cooling systems.

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  • Efficient Electroluminescence from Organic Fluorophore-Containing Perovskite Films 査読

    Matsushima, T; Qin, CJ; Teng, T; Kamatham, N; Vargas, LS; Kreher, D; Heinrich, B; Ishii, T; Terakawa, S; Leyden, MR; Sandanayaka, ASD; Bencheikh, F; Miyata, K; Onda, K; Kanemitsu, Y; Mathevet, F; Adachi, C

    ADVANCED MATERIALS   e2408775   2024年10月   ISSN:0935-9648 eISSN:1521-4095

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Advanced Materials  

    Two-dimensional perovskites containing an organic fluorophore can be a unique emitter for light-emitting diodes (LEDs). However, external quantum efficiencies (EQEs) of fluorophore-containing perovskite LEDs reported thus far are still very low. In this study, these are able to boost the EQE to ≈10% by choosing an organic fluorophore with appropriate energy levels for the perovskite structure organization. In the fluorophore-containing perovskite LEDs, carrier transport and exciton formation take place in the perovskite's metal halide framework, thereby avoiding the direct formation of nonradiative triplet excitons on the organic fluorophores. Subsequently, the bright triplet excitons formed in the metal halide framework are transferred to form the radiative singlet states of the organic fluorophores, leading to efficient electroluminescence (EL) from the organic fluorophores regularly dispersed inside the perovskite structure. Unexpectedly higher light-outcoupling efficiency, which is caused by the light scattering in the polycrystalline perovskite layer, will be another reason for efficient EL. These findings will contribute toward the fabrication of LED-based products with high performance at a low cost.

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  • Unexplored Exciplex Formation by Dual Excitation of Donor and Acceptor Layers Optically and Electrically 査読

    Rajakaruna, TPB; Tang, X; Nakanotani, H; Adachi, C

    ADVANCED OPTICAL MATERIALS   12 ( 28 )   2024年10月   ISSN:2195-1071 eISSN:2195-1071

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Advanced Optical Materials  

    Electron donor and acceptor interactions are the fundamentals for the emergence of optoelectronic functions in most organic devices. In particular, exciplexes, which hold the possibility to utilize dark triplets, are widely investigated in organic light-emitting diodes. However, the relatively low radiative decay rate with a low photoluminescence quantum yield poses further advanced challenges. Traditionally, it is well recognized that exciplexes are formed through a charge transfer process, i.e., direct electron transfer, by photoexciting either a donor or an acceptor component. In this study, the focus is on a long-range exciplex system where tris(4-carbazoyl-9-ylphenyl)amine (TCTA) and 2,4,6-tris[3-(diphenylphosphinyl)phenyl]−1,3,5-triazine (PO-T2T) serve as the donor and acceptor, respectively. Moreover, 1,2-bis(triphenylsilyl) benzene (UGH2) and bis[2-(diphenylphosphino)phenyl]ether oxide (DPEPO), having a wide energy gap and a high triplet energy level, are employed as the double insulating layer to suppressing direct electron transfer between the donor and acceptor. The indirect through-space exciplex formation is demonstrated by the simultaneous excitation of both donor and acceptor layers optically and electrically, providing a new route for exciplex formation.

    DOI: 10.1002/adom.202401237

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  • Organic thermoelectric device utilizing charge transfer interface as the charge generation by harvesting thermal energy 査読

    Kondo, S; Kameyama, M; Imaoka, K; Shimoi, Y; Mathevet, F; Fujihara, T; Goto, H; Nakanotani, H; Yahiro, M; Adachi, C

    NATURE COMMUNICATIONS   15 ( 1 )   8115   2024年9月   eISSN:2041-1723

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Nature Communications  

    We propose an organic thermoelectric device having a new power generation mechanism that extracts small-scale thermal energy, i.e., a few tens of millielectronvolts, at room temperature without a temperature gradient. We demonstrate a new operating mechanism based on an organic thermoelectric power generation architecture that uses the charge separation capabilities of organic charge transfer (CT) interfaces composed of copper (II) phthalocyanine and copper (II) 1,2,3,4,8,9,10,11,15,16,17,18,22,23,24,25-hexadecafluoro-29H,31H-phthalocyanine as the donor and acceptor, respectively. With the optimized device architecture, values of open-circuit voltage VOC of 384 mV, short-circuit current density JSC of 1.1 μA/cm2, and maximum output Pmax of 94 nW/cm2 are obtained. The temperature characteristics of the thermoelectric properties yield activation energy values of approximately 20–60 meV, confirming the low-level thermal energy’s contribution to the power generation mechanism. Furthermore, from surface potential analysis using a Kelvin probe, we confirm that charges are generated at the CT interface, and the electrons and holes are diffused to the counter-electrodes with the aid of Fermi-level alignment between adjacent layers.

    DOI: 10.1038/s41467-024-52047-5

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  • Donor-only substituted benzene achieves thermally activated delayed fluorescence 査読

    Mamada, M; Yada, S; Hayakawa, M; Uchida, R; Katagiri, H; Hatakeyama, T; Adachi, C

    COMMUNICATIONS CHEMISTRY   7 ( 1 )   212   2024年9月   ISSN:2399-3669 eISSN:2399-3669

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Communications Chemistry  

    Thermally activated delayed fluorescence (TADF) is a promising mechanism for harvesting triplet excitons in organic light-emitting diodes (OLEDs). The donor–acceptor (D–A) design is the most conventional strategy for developing efficient TADF emitters. A subsequently emerged approach, known as the multiple resonance (MR) effect, also employs electron-donating and electron-withdrawing functional groups. Thus, developing TADF materials has traditionally relied on ingenuity in selecting and combining two functional units. Here, we have realized a TADF molecule by utilizing only a carbazole donor moiety. This molecule is an unusual example in the family of TADF materials and offers better insight into the electronic structures in the excited states for luminescent materials. (Figure presented.)

    DOI: 10.1038/s42004-024-01301-4

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  • Modified Prompt and Delayed Kinetics in a Strongly Coupled Organic Microcavity Containing a Multiresonance TADF Emitter 査読

    Ishii, T; Pérez-Sánchez, JB; Yuen-Zhou, J; Adachi, C; Hatakeyama, T; Kéna-Cohen, S

    ACS PHOTONICS   11 ( 10 )   3998 - 4007   2024年9月   ISSN:2330-4022 eISSN:2330-4022

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:ACS Photonics  

    Exciton polaritons are collective matter-light excitations that can be spaced up to 1 eV away from the bare molecular excited states. This hints at their potential to modify molecular emission processes. In the vast majority of cases, however, the observed emission rates from exciton polaritons remain nearly unchanged from those of the bare molecule and can be explained through radiative pumping of polaritons by dark molecular excited states. In this study, we observe a reduction in the prompt and delayed emission rates from exciton polaritons in a microcavity containing molecules that show multiresonance thermally activated delayed fluorescence. We find that most of our experimental observations are due to the existence of molecular configurations supporting excimers in the film. In the presence of strong coupling, polariton emission at the excimer energy shows the same kinetics observed at the monomer energy. Using a semiclassical model to describe the polariton kinetics, we find that this can be explained by the transfer of polaritons initially populated by the monomers to the dark states, followed by re-emission at lower energies. At the lowest temperatures, the longest-lived component of the delayed emission lifetime still cannot be understood via this mechanism.

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  • Efficient photosensitized luminescence from Eu<SUP>3+</SUP> in inert nanocrystals via ligand coordination 査読

    Goushi, K; Kashiwagi, Y; Adachi, C

    JAPANESE JOURNAL OF APPLIED PHYSICS   63 ( 9 )   09SP31 - 09SP31   2024年9月   ISSN:0021-4922 eISSN:1347-4065

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers  

    Luminescent lanthanide ions incorporated in sodium yttrium fluoride nanocrystals are promising as new luminescent materials in optoelectronics and bioimaging since the nonradiative transition is significantly suppressed due to the absence of high-energy vibrational modes. To prepare optically and electrically active nanocrystals, we explored organic ligands that allow efficient triplet energy transfer to Eu3+ incorporated into nanocrystals, resulting in an efficient photosensitization effect in colloidal solutions and films. Further, we applied these emitting nanocrystals to light-emitting devices and observed the electroluminescence.

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  • Effect of Multiple Acceptor Structures in Electron Transport Materials on Operational Lifetime of Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes 査読

    Kiriyama, S; Mamada, M; Goushi, K; Madushani, B; Hatakeyama, T; Adachi, C

    ADVANCED FUNCTIONAL MATERIALS   34 ( 37 )   2024年9月   ISSN:1616-301X eISSN:1616-3028

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Advanced Functional Materials  

    Recent advances in organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF)-assisted fluorescence (TAF) attest to the great promise of this technology in practical use. However, the simultaneous realization of high efficiency and device durability in blue OLEDs remains a significant challenge. Clarification of the degradation mechanisms correlated to molecular structure and device configuration is the key to extending the device lifetime. In this study, electron transport materials incorporating two triazine units in close proximity are adopted to use in hole-blocking and electron-transporting layers, resulting in superior device performances. In addition, a modified photodegradation experiment reveals that the degradation origins closely relate to charge carriers. The optimization of the device according to the obtained findings leads to 4.5 times extension in the lifetime of the TAF-OLED using a multiple resonance emitter. These results also provide guidelines for designing robust electron transport materials for blue OLEDs.

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  • Naphthalene Diimide-Based Hydrogen-Bonded Organic Framework for High Electrical Conductivity and Ammonia Sensor Applications 査読

    Imaoka, K; Kim, HS; Yamamoto, Y; Fukutomi, S; Chamoreau, LM; Qu, LY; Iguchi, H; Tsuchiya, Y; Ono, T; Mathevet, F; Adachi, C

    ADVANCED FUNCTIONAL MATERIALS   2024年8月   ISSN:1616-301X eISSN:1616-3028

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Advanced Functional Materials  

    While metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) have been widely investigated as porous conductive materials, the research on the electrical properties of HOF materials has been limited. Moreover, the electrical conductivity of HOF materials is typically several orders of magnitude lower than that of MOFs and COFs. In this work, a HOF material based on naphthalene diimide is designed and achieved a remarkable electrical conductivity of 2.9 × 10−2 S cm−1 after hydrazine doping, which represents the highest value reported in the HOF system to date. In addition, this material exhibits a reversible change of its electrical conductivity under exposure to ammonia which is promising for gas-sensor applications. The demonstration reveals a new dimension of HOFs as conductive materials and opens up possibilities for new HOF-based devices.

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  • Molecular asymmetry and rigidification as strategies to activate and enhance thermally activated delayed fluorescence in deep-blue MR-TADF emitters 査読

    Weerasinghe, RW; dos Santos, JM; Chitose, Y; Matulaitis, T; Warriner, SL; Barman, D; Chan, CY; Tsuchiya, Y; Zysman-Colman, E; Adachi, C

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   26 ( 32 )   21337 - 21341   2024年8月   ISSN:1463-9076 eISSN:1463-9084

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Physical Chemistry Chemical Physics  

    Two novel deep-blue multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters, 1B-CzCrs and 2B-CzCrs, containing a fused carbazole unit were synthesized. The carbazole contributed to the emergence of TADF in these small molecules. Particularly, organic light-emitting diodes with 1B-CzCrs doped in the mCP host achieve a maximum external quantum efficiency of 12.8% at CIE coordinates of (0.146, 0.062).

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  • Thermally Stable Perovskite Solar Cells with Fluoropolymer Coating 査読

    Fujita, Y; Semba, D; Purev-Ochir, B; Nakamura, N; Raju, TB; Matsushima, T; Adachi, C

    SOLAR RRL   8 ( 16 )   2024年8月   ISSN:2367-198X eISSN:2367-198X

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Solar RRL  

    Halide perovskites are promising as the light absorbers of solar cells with efficient solar power conversion. However, why the degradation of perovskite solar cells (PSCs), especially at high temperatures, happens has not been completely understood to date. Herein, it is shown that evaporation of 4-tert-butylpyridine (4-tBP) from the hole transport layer (HTL) of 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamino)-9,9'-spirobifluorene (spiro-OMeTAD) is one of possible degradation mechanisms in PSCs at a high temperature of 85 °C. In fresh PSCs, the chemical doping of the spiro-OMeTAD HTL with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is not so efficient because of the formation of a LiTFSI:4-tBP complex in the HTL. When PSCs are placed at 85 °C, 4-tBP gradually evaporates from the HTL, resulting in the dissociation of the LiTFSI:4-tBP complex. This 4-tBP evaporation enhances the chemical doping of spiro-OMeTAD by LiTFSI and makes the hole transport level of the spiro-OMeTAD HTL deeper, thereby impeding hole extraction at the perovskite/spiro-OMeTAD/Au interfaces. Herein, the 4-tBP evaporation by covering PSCs with a fluoro-polymer CYTOP layer, significantly improving the high-temperature durability of PSCs, is suppressed. The basic understanding obtained in this study would help promote the spread of more thermally durable PSC products in the future.

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  • Spacer dependence of exciplex dynamics in donor/spacer/acceptor layers 査読

    Rajakaruna, TPB; Tang, X; Nakanotani, H; Adachi, C

    CHEMICAL PHYSICS LETTERS   848   2024年8月   ISSN:0009-2614 eISSN:1873-4448

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Chemical Physics Letters  

    Exciplexes are crucial in organic optoelectronic devices since well-elaborated charge-transfer (CT) complexes exhibit unique exciton generation behavior. Thus, understanding the CT energy structures with exciton dynamics depending on donor–acceptor separation distances is essential for extracting their full potential. In this study, we investigated a long-range exciplex behavior between the electron donor of tris(4-carbazoyl-9-ylphenyl)amine (TCTA) and the electron acceptor of 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (PO-T2T) by finely controlling their distance with 1,4-bis(triphenylsilyl)benzene (UGH-2) as a spacer layer. We report the characteristic exciplex photophysical kinetic behavior with time-dependent dynamics in terms of the donor–acceptor distance associated with the singlet–triplet energy gap and activation energy variation.

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  • Simultaneous control of carrier transport and film polarization of emission layers aimed at high-performance OLEDs 査読

    Tanaka, M; Chan, CY; Nakanotani, H; Adachi, C

    NATURE COMMUNICATIONS   15 ( 1 )   5950   2024年7月   eISSN:2041-1723

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Nature Communications  

    The orientation of a permanent dipole moment during vacuum deposition results in the occurrence of spontaneous orientation polarization (SOP). Previous studies reported that the presence of SOP in organic light-emitting diodes (OLEDs) lowers electroluminescence efficiency because electrically generated excitons are seriously quenched by SOP-induced accumulated charges. Thus, the SOP in a host:guest-based emission layer (EML) should be finely controlled. In this study, we demonstrate the positive effect of dipole-dipole interactions between polar host and polar emitter molecules on the OLED performance. We found that a small-sized polar host molecule that possesses both high molecular diffusivities and moderate permanent dipole moment, well cancels out the polarization formed by the SOP of the emitter molecules in the EML without a disturbance of the emitter molecules’ intrinsic orientation, leading to high-performance of OLEDs. Our molecular design strategy will allow emitter molecules to pull out the full potential of the EMLs in OLEDs.

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  • Hexacarbazolylbenzene: An Excellent Host Molecule Causing Strong Guest Molecular Orientation and the High-Performance OLEDs 査読

    Madushani, B; Mamada, M; Goushi, K; Katagiri, H; Nakanotani, H; Hatakeyama, T; Adachi, C

    ADVANCED MATERIALS   36 ( 30 )   e2402275   2024年7月   ISSN:0935-9648 eISSN:1521-4095

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Advanced Materials  

    Hexacarbazolylbenzene (6CzPh), which is benzene substituted by six carbazole rings, is a simple and attractive compound. Despite the success of a wide variety of carbazole derivatives in organic light-emitting diodes (OLEDs), 6CzPh has not received attention so far. Here, excellent performances of 6CzPh are revealed as a host material in OLEDs regarding conventional host materials. Various strategies are implemented to improve the performance of OLEDs, e.g., triplet utilization by thermally activated delayed fluorescence (TADF) and phosphorescence emitters for maximizing internal quantum efficiency, and molecular orientation control for increasing outcoupling efficiency. The present host material is suited for both criteria. Robustness of the structure and sufficiently high triplet energy enables a high external quantum efficiency with a long device lifetime. Besides, the host material boosts the horizontal molecular orientations of several guest emitters. It is noteworthy that disk-shaped 4CzIPN marks the complete horizontal molecular orientations (Θh = 100%, S = −0.50). These results provide an effective way of improving efficiencies without sacrificing device durability for future OLEDs.

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  • Efficient Near-Infrared Fluorescence in Deuterated Host-Guest System for Near-Infrared Organic Light-Emitting Diodes 査読

    Yu, Q; Tamura, Y; Nakanotani, H; Mamada, M; Adachi, C

    ADVANCED OPTICAL MATERIALS   12 ( 21 )   2024年7月   ISSN:2195-1071 eISSN:2195-1071

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Advanced Optical Materials  

    Near-infrared organic light-emitting diodes (NIR-OLEDs) possess substantial potential for future valuable applications, such as a light source for sensing applications. However, the low photoluminescence quantum yield (PLQY) of NIR-emitting molecules represents a significant impediment to these applications. In this study, the impact of the deuteration of both of host (mCP-d20: 1,3-Dicarbazole-benzene-d20) and guest (BBT-TPA-d28: 4,8-bis[4-(N,N-diphenylamino)phenyl]benzo[1,2-c:4,5-c']bis[1,2,5]thiadiazole-d28) on NIR PL properties in the host–guest codeposited film is reported. The 1 wt%-BBT-TPA-d28:mCP-d20 codeposited film exhibited PLQY of 15 ± 2% with an emission peak wavelength at ≈900 nm, which is about three times higher than that of the film composed of undeuterated molecules. Importantly, the deuteration of only the host or guest does not yield the PLQY up to 15%, underlining the importance of the deuteration of both host and guest molecules in suppressing nonradiative decay processes. The NIR-OLED with the deuterated codeposited film as an emissive layer demonstrates a maximum external electroluminescence quantum efficiency of 2.3 ± 0.2%.

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  • Visualization of Multiple-Resonance-Induced Frontier Molecular Orbitals in a Single Multiple-Resonance Thermally Activated Delayed Fluorescence Molecule 査読

    Bae, J; Imai-Imada, M; Kim, HS; Lee, MH; Imada, H; Tsuchiya, Y; Hatakeyama, T; Adachi, C; Kim, Y

    ACS NANO   18 ( 27 )   17987 - 17995   2024年6月   ISSN:1936-0851 eISSN:1936-086X

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ACS Nano  

    The spatial distribution and electronic properties of the frontier molecular orbitals (FMOs) in a thermally activated delayed fluorescence (TADF) molecule contribute significantly to the TADF properties, and thus, a detailed understanding and sophisticated control of the FMOs are fundamental to the design of TADF molecules. However, for multiple-resonance (MR)-TADF molecules that achieve spatial separation of FMOs by the MR effect, the distinctive distribution of these molecular orbitals poses significant challenges for conventional computational analysis and ensemble averaging methods to elucidate the FMOs’ separation and the precise mechanism of luminescence. Therefore, the visualization and analysis of electronic states with the specific energy level of a single MR-TADF molecule will provide a deeper understanding of the TADF mechanism. Here, scanning tunneling microscopy/spectroscopy (STM/STS) was used to investigate the electronic states of the DABNA-1 molecule at the atomic scale. FMOs’ visualization and local density of states analysis of the DABNA-1 molecule clearly show that MR-TADF molecules also have well-separated FMOs according to the internal heteroatom arrangement, providing insights that complement existing theoretical prediction methods.

    DOI: 10.1021/acsnano.4c04813

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  • Improved Photoluminescence, Electroluminescence, and Laser Characteristics of 1-Naphthylmethylamine-Based Quasi-Two-Dimensional Perovskite Films at Lower Temperatures 査読

    Nasu, R; Tang, X; Senevirathne, AMC; Matsushima, T; Adachi, C

    JOURNAL OF PHYSICAL CHEMISTRY C   128 ( 26 )   10974 - 10981   2024年6月   ISSN:1932-7447 eISSN:1932-7455

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Physical Chemistry C  

    In recent years, halide perovskite materials have made significant progress in optically pumped lasing. Among many reported perovskites, 1-naphthylmethylamine (NMA)-based quasi-two-dimensional (quasi-2D) perovskite films are promising as a gain medium for low-threshold optical lasing. However, their optical laser thresholds are still high for the realization of electrically pumped lasing. To explore the possibility of reducing the thresholds, we investigate temperature-dependent laser characteristics of NMA-based quasi-2D perovskite films fabricated on top of a circularly shaped distributed feedback resonator. Although the laser threshold of these films is already low (∼2 μJ cm-2) at room temperature (298 K), their threshold is further reduced by ∼1/200 to ∼0.01 μJ cm-2 as the film temperatures go down to 73 K. From the optical threshold at 73 K, the threshold current density required for the electrical lasing is estimated at a very low value of ∼3.4 A cm-2. However, the optical laser threshold and estimated current threshold are, respectively, increased to ∼6 μJ cm-2 and ∼2.04 kA cm-2 because of the presence of an optical loss in actual devices with a metal electrode. Therefore, future optimization of device architectures to reduce the optical loss is crucial to realizing the electrical lasing.

    DOI: 10.1021/acs.jpcc.4c01763

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  • "Core-Shell" Wave Function Modulation in Organic Narrowband Emitters 査読

    Hayakawa, M; Tang, X; Ueda, Y; Eguchi, H; Kondo, M; Oda, S; Fan, XC; Lestanto, GNI; Adachi, C; Hatakeyama, T

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   146 ( 27 )   18331 - 18340   2024年6月   ISSN:0002-7863 eISSN:1520-5126

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of the American Chemical Society  

    Efficient red-green-blue primary luminescence with an extraordinarily narrow band and durability is crucial for advanced display applications. Recently, the emergence of multiple-resonance (MR) from short-range atomic interactions has been shown to induce extremely narrow spectral widths in pure organic emitters. However, achieving wide-range color tuning without compromising color purity remains a persistent challenge for MR emitters. Herein, the concept of electronic donor/acceptor “core-shell” modulation is proposed within a boron/nitrogen (B/N) MR skeleton, enabling the rational utilization of intramolecular charge transfer to facilitate wavelength shift. The dense B atoms localized at the center of the molecule effectively compress the electron density and stabilize the lowest unoccupied molecular orbital wave function. This electron-withdrawing core is embedded with peripheral electron-donating atoms. Consequently, doping a single B atom into a deep-blue MR framework led to a profound bathochromic shift from 447 to 624 nm (∼0.8 eV) while maintaining a narrow spectral width of 0.10 eV in this pure-red emitter. Notably, organic light-emitting diodes assisted by thermally activated delayed fluorescence molecules achieved superb electroluminescent stability, with an LT99 (99% of the initial luminance) exceeding 400 h at an initial luminance of 1000 cd m-2, approaching commercial-level performance without the assistance of phosphors.

    DOI: 10.1021/jacs.4c02598

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  • Impact of Spontaneous Orientational Polarization on Triplet-Triplet Upconversion-Based Blue Organic Light-Emitting Diodes 査読

    Kakumachi, S; Nakanotani, H; Nagasaki, Y; Adachi, C

    ACS APPLIED MATERIALS & INTERFACES   16 ( 24 )   31392 - 31398   2024年6月   ISSN:1944-8244 eISSN:1944-8252

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ACS Applied Materials and Interfaces  

    The spontaneous orientation polarization (SOP) of a permanent dipole moment of the molecule induces a giant surface potential (GSP) in an organic semiconductor film, and GSP is expected to be a crucial parameter for understanding the operational mechanism of organic light-emitting diodes (OLEDs). This study demonstrates that the voltage-dependent migration of a carrier recombination zone induced by a polar electron transporting layer (ETL) having a positive SOP causes a decline in the overall performance of the OLED in triplet-triplet upconversion (TTU) based on OLEDs. Specifically, the TTU efficiency in an OLED with 2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) as the ETL decreased by 20% due to the reduction of electrically generated triplet exciton density. This decrease resulted in a lower external electroluminescence (EL) quantum efficiency (EQE) of 5.4% at 1 mA cm-2, while the OLED with a nonpolar ETL resulted in an EQE of around 8.1% at 1 mA cm-2. We confirmed a shift in the recombination zone from the current density dependence of the EL spectra in the OLEDs. Our results indicate that the fixed carrier recombination zone near a hole transport layer and an emitting layer (HTL/EML) strongly enhanced the TTU process, while the polar EML/ETL interface induced the migration of the recombination zone depending on voltage, resulting in the decrease of triplet exciton density.

    DOI: 10.1021/acsami.4c02821

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  • A Boron, Nitrogen, and Oxygen Doped π-Extended Helical Pure Blue Multiresonant Thermally Activated Delayed Fluorescent Emitter for Organic Light Emitting Diodes That Shows Fast <i>k</i><sub>RISC</sub> Without the Use of Heavy Atoms 査読

    Weerasinghe, RW; Suresh, SM; Hall, D; Matulaitis, T; Slawin, AMZ; Warriner, S; Lee, YT; Chan, CY; Tsuchiya, Y; Zysman-Colman, E; Adachi, C

    ADVANCED MATERIALS   36 ( 26 )   e2402289   2024年6月   ISSN:0935-9648 eISSN:1521-4095

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Advanced Materials  

    Narrowband emissive multiresonant thermally activated delayed fluorescence (MR-TADF) emitters are a promising solution to achieve the current industry-targeted color standard, Rec. BT.2020-2, for blue color without using optical filters, aiming for high-efficiency organic light-emitting diodes (OLEDs). However, their long triplet lifetimes, largely affected by their slow reverse intersystem crossing rates, adversely affect device stability. In this study, a helical MR-TADF emitter (f-DOABNA) is designed and synthesized. Owing to its π-delocalized structure, f-DOABNA possesses a small singlet-triplet gap, ΔEST, and displays simultaneously an exceptionally faster reverse intersystem crossing rate constant, kRISC, of up to 2 × 106 s−1 and a very high photoluminescence quantum yield, ΦPL, of over 90% in both solution and doped films. The OLED with f-DOABNA as the emitter achieved a narrow deep-blue emission at 445 nm (full width at half-maximum of 24 nm) associated with Commission Internationale de l'Éclairage (CIE) coordinates of (0.150, 0.041), and showed a high maximum external quantum efficiency, EQEmax, of ≈20%.

    DOI: 10.1002/adma.202402289

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  • Stable pure-green organic light-emitting diodes toward Rec.2020 standard 査読

    Tang, X; Tsagaantsooj, T; Rajakaruna, TPB; Wang, K; Chen, XK; Zhang, XH; Hatakeyama, T; Adachi, C

    NATURE COMMUNICATIONS   15 ( 1 )   4394   2024年5月   eISSN:2041-1723

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Nature Communications  

    Manipulating dynamic behaviours of charge carriers and excitons in organic light-emitting diodes (OLEDs) is essential to simultaneously achieve high colour purity and superior operational lifetime. In this work, a comprehensive transient electroluminescence investigation reveals that incorporating a thermally activated delayed fluorescence assistant molecule with a deep lowest unoccupied molecular orbital into a bipolar host matrix effectively traps the injected electrons. Meanwhile, the behaviours of hole injection and transport are still dominantly governed by host molecules. Thus, the recombination zone notably shifts toward the interface between the emissive layer (EML) and the electron-transporting layer (ETL). To mitigate the interfacial carrier accumulation and exciton quenching, this bipolar host matrix could serve as a non-barrier functional spacer between EML/ETL, enabling the distribution of recombination zone away from this interface. Consequently, the optimized OLED exhibits a low driving voltage, promising device stability (95% of the initial luminance of 1000 cd m−2, LT95 > 430 h), and a high Commission Internationale de L’Éclairage y coordinate of 0.69. This indicates that managing the excitons through rational energy level alignment holds the potential for simultaneously satisfying Rec.2020 standard and achieving commercial-level stability.

    DOI: 10.1038/s41467-024-48659-6

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  • Delocalized, asynchronous, closed-loop discovery of organic laser emitters 査読

    Strieth-Kalthoff, F; Hao, H; Rathore, V; Derasp, J; Gaudin, T; Angello, NH; Seifrid, M; Trushina, E; Guy, M; Liu, JL; Tang, X; Mamada, M; Wang, W; Tsagaantsooj, T; Lavigne, C; Pollice, R; Wu, TC; Hotta, K; Bodo, L; Li, SY; Haddadnia, M; Wolos, A; Roszak, R; Ser, CT; Bozal-Ginesta, C; Hickman, RJ; Vestfrid, J; Aguilar-Granda, A; Klimareva, EL; Sigerson, RC; Hou, WD; Gahler, D; Lach, S; Warzybok, A; Borodin, O; Rohrbach, S; Sanchez-Lengeling, B; Adachi, C; Grzybowski, BA; Cronin, L; Hein, JE; Burke, MD; Aspuru-Guzik, A

    SCIENCE   384 ( 6697 )   eadk9227   2024年5月   ISSN:0036-8075 eISSN:1095-9203

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Science  

    Contemporary materials discovery requires intricate sequences of synthesis, formulation, and characterization that often span multiple locations with specialized expertise or instrumentation. To accelerate these workflows, we present a cloud-based strategy that enabled delocalized and asynchronous design-make-test-analyze cycles. We showcased this approach through the exploration of molecular gain materials for organic solid-state lasers as a frontier application in molecular optoelectronics. Distributed robotic synthesis and in-line property characterization, orchestrated by a cloud-based artificial intelligence experiment planner, resulted in the discovery of 21 new state-of-the-art materials. Gram-scale synthesis ultimately allowed for the verification of best-in-class stimulated emission in a thin-film device. Demonstrating the asynchronous integration of five laboratories across the globe, this workflow provides a blueprint for delocalizing-and democratizing-scientific discovery.

    DOI: 10.1126/science.adk9227

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  • Efficient blue electroluminescence from reduced-dimensional perovskites

    Yuan, S; Dai, LJ; Sun, YQ; Auras, F; Zhou, YH; An, RZ; Liu, Y; Ding, CF; Cassidy, C; Tang, X; Dong, SC; Kang, HB; Chen, K; Liu, XM; Ye, ZF; Zhao, YX; Adachi, C; Liao, LS; Greenham, NC; Qi, YB; Stranks, SD; Cui, LS; Friend, RH

    NATURE PHOTONICS   18 ( 5 )   425 - 431   2024年5月   ISSN:1749-4885 eISSN:1749-4893

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    出版者・発行元:Nature Photonics  

    Perovskite light-emitting diodes (LEDs) show promises for next-generation displays owing to their excellent luminescent properties and low cost. Despite substantial progress with green- and red-emitting devices, the development of efficient blue perovskite LEDs has lagged behind. Here we demonstrate efficient blue perovskite LEDs based on a mixed two-dimensional–three-dimensional perovskite and a multifunctional ionic additive that enables control over the reduced-dimensional phases, non-radiative recombination channels and spectral stability. We report a series of devices that emit efficient electroluminescence from mixed bromide/chloride quasi-three-dimensional regions, with external quantum efficiencies of up to 21.4% (at a luminance of 22 cd m–2 and emission peak at 483 nm), 13.2% (at a luminance of 2.0 cd m–2 and emission peak at 474 nm) and 7.3% (at a luminance of 6 cd m–2 and emission peak at 464 nm). Devices show a nearly 30-fold increase in operational stability compared with control LEDs, with a half-lifetime of 129 min at an initial luminance of 100 cd m–2. Our findings demonstrate the performance of blue perovskite LEDs close to that of state-of-the-art blue organic LEDs and inorganic quantum dot LEDs and provide a new approach to design multifunctional molecules to boost the performance of perovskite optoelectronic devices.

    DOI: 10.1038/s41566-024-01382-6

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  • Realizing a flexible and wavelength-tunable random laser inspired by cicada wings 査読

    Chou, CJ; Abe, A; Tang, JF; Lin, TC; Kuo, CC; Lin, JH; Adachi, C

    JOURNAL OF MATERIALS CHEMISTRY C   12 ( 16 )   5701 - 5707   2024年4月   ISSN:2050-7526 eISSN:2050-7534

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Materials Chemistry C  

    A bio-tissue-inspired random laser (RL) has been successfully demonstrated using a dye-covered silk fibroin replica film (DC-SFRF) fabricated through soft lithography of a cicada's wing. Thanks to the increased light scattering between the nanopapillate structures of the DC-SFRF, the RL exhibits a lower lasing threshold, higher slope efficiency, and broader angular emission compared to those of the dye-covered silk fibroin film (DC-SFF). The low spatial coherence NIR RL can also serve as a suitable light source in bio-diagnosis to generate a low speckle noise image with a contrast of approximately 0.040. By employing flexible PET as a substrate, we have demonstrated the flexibility of the near-infrared random laser (NIR RL) through the application of mechanical stress to alter the distribution of nanopapillate structures on the surface of the replica film. As the curvature increases, the DC-SFRF RL exhibits a blue shift of 13.3 nm in the emission spectrum and a further reduction in the speckle contrast to 0.031.

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  • Bright, efficient, and stable pure-green hyperfluorescent organic light-emitting diodes by judicious molecular design 査読

    Lee, YT; Chan, CY; Matsuno, N; Uemura, S; Oda, S; Kondo, M; Weerasinghe, RW; Hu, YM; Lestanto, GNI; Tsuchiya, Y; Li, YF; Hatakeyama, T; Adachi, C

    NATURE COMMUNICATIONS   15 ( 1 )   3174   2024年4月   eISSN:2041-1723

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Nature Communications  

    To fulfill ultra-high-definition display, efficient and bright green organic light-emitting diodes with Commission Internationale de l’Éclairage y-coordinate ≥ 0.7 are required. Although there are some preceding reports of highly efficient devices based on pure-green multi-resonance emitters, the efficiency rolloff and device stabilities for those pure-green devices are still unsatisfactory. Herein, we report the rational design of two pure-green multi-resonance emitters for achieving highly stable and efficient pure-green devices with CIEx,ys that are close to the NTSC and BT. 2020 standards. In this study, our thermally activated delayed fluorescence OLEDs based on two pure-green multi-resonance emitters result in CIEy up to 0.74. In hyperfluorescent device architecture, the CIExs further meet the x-coordinate requirements, i.e., NTSC (0.21) and BT. 2020 (0.17), while keeping their CIEys ~ 0.7. Most importantly, hyperfluorescent devices display the high maximum external quantum efficiencies of over 25% and maximum luminance of over 105 cd m−2 with suppressed rolloffs (external quantum efficiency of ~20% at 104 cd m−2) and long device stabilities with LT95s of ~ 600 h.

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  • Suppressed Gold Penetration with the Molybdenum Oxide Interlayer to Increase Power Conversion Efficiency of Perovskite Solar Cells 査読

    Purev-Ochir, B; Song, JT; Wang, PP; Yahiro, M; Yamada, S; Nakanotani, H; Matsushima, T; Adachi, C

    SOLAR RRL   8 ( 8 )   2024年4月   ISSN:2367-198X eISSN:2367-198X

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Solar RRL  

    Perovskite solar cells (PSCs) have undergone an unprecedentedly rapid development in both power conversion efficiency (PCE) and operational durability. However, a number of unknown challenges remain before PSC products are ready to launch. Herein, it is demonstrated that the vacuum deposition of gold (Au) onto the organic hole-transport layer (HTL) results in Au penetration into the perovskite layer. This Au penetration proves to be a limiting factor in PCE due to detrimental carrier recombination caused by the penetrated Au component inside the perovskite light absorber. To mitigate this issue, a thin molybdenum oxide (MoOx) interlayer between the organic HTL and the Au electrode is introduced, effectively reducing the Au penetration and suppressing the carrier recombination. Consequently, this MoOx introduction increases PCEs from ≈16.9% to ≈19.6% by ≈2.7%. Furthermore, using the MoOx interlayer improves the long-term durability of PSCs. These findings are crucial in elucidating a basic mechanism that limits PCE and in advancing the fabrication of PSC products with even higher performance.

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  • Co-trimerization of benzonitriles with guanidine hydrochloride: synthesis of 2-bromo-4,6-diaryl-1,3,5-triazine derivatives bearing electron-withdrawing groups 査読

    Chitose, Y; Tamura, Y; Tsuchiya, Y; Adachi, C

    CHEMISTRY LETTERS   53 ( 4 )   2024年3月   ISSN:0366-7022 eISSN:1348-0715

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Chemistry Letters  

    In recent decades, various types of aryl-substituted 1,3,5-triazine derivatives have been applied in many research fields, including biomedical chemistry, non-linear optics, and organic electronics. However, the substituent scope for 4,6-diaryl-1,3,5-triazines (DAr-TRZs) remains limited. Here, we present our work on the synthesis of 2-amino- and 2-bromo-DAr-TRZ derivatives bearing electron-withdrawing groups on the aryl rings. Our synthetic methods successfully provided trifluoromethyl-, nitrile-, and nitro-substituted DAr-TRZs. These will expand the structural diversity of conventional triazine-based functional materials.

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  • Understanding of complex spin up-conversion processes in charge-transfer-type organic molecules 査読

    Hyung Suk Kim, Sang Hoon Lee, Seunghyup Yoo, Chihaya Adachi

    Nature Communications   15 ( 1 )   2024年3月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Abstract

    Despite significant progress made over the past decade in thermally activated delayed fluorescence (TADF) molecules as a material paradigm for enhancing the performance of organic light-emitting diodes, the underlying spin-flip mechanism in these charge-transfer (CT)-type molecular systems remains an enigma, even since its initial report in 2012. While the initial and final electronic states involved in spin-flip between the lowest singlet and lowest triplet excited states are well understood, the exact dynamic processes and the role of intermediate high-lying triplet (T) states are still not fully comprehended. In this context, we propose a comprehensive model to describe the spin-flip processes applicable for a typical CT-type molecule, revealing the origin of the high-lying T state in a partial molecular framework in CT-type molecules. This work provides experimental and theoretical insights into the understanding of intersystem crossing for CT-type molecules, facilitating more precise control over spin-flip rates and thus advancing toward developing the next-generation platform for purely organic luminescent candidates.

    DOI: 10.1038/s41467-024-46406-5

  • A donor-acceptor cage for circularly polarized TADF emission

    Chen, LH; Li, CF; Liu, ZF; Kuboi, Y; Fu, EG; Vargas, LS; Adachi, C; Mathevet, F; Zhang, SD

    CHEMICAL COMMUNICATIONS   60 ( 13 )   1758 - 1761   2024年2月   ISSN:1359-7345 eISSN:1364-548X

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    記述言語:英語   出版者・発行元:Chemical Communications  

    Herein, we report the first example of chiral donor-acceptor cage DA-2 displaying efficient circularly polarized thermally activated delayed fluorescence (CP-TADF) with |glum| values up to 2.1 × 10−3 and PLQY of 32%. A small ΔEST of 0.051 eV and quasi-parallel (θ = 6°) transition electric and magnetic dipole moments were realized from the through-space charge transfer interaction between the parallelly aligned donor and acceptor in DA-2. This D-A cage configuration has provided a novel design strategy for discovering potential efficient CP-TADF emitters.

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  • Three-dimensional sensing of surfaces by projection of invisible electroluminescence from organic light-emitting diodes 査読

    Nishiki Yamada, Hajime Nakanotani, Akitsuna Takagi, Masashi Mamada, Umamahesh Balijapalli, Tatsuya Ichikawa, Eiji Hirata, Shun Kaizu, Akira Tanaka, Kazuichiro Itonaga, Chihaya Adachi

    Science Advances   10 ( 1 )   2024年1月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Organic light-emitting diodes (OLEDs) that efficiently emit near-infrared (NIR) light and consume little power will create valuable applications for OLEDs beyond just displays. Here, we report such a NIR-OLED with high operational stability that can be used as a light source for three-dimensional sensing of object’s surfaces. Using a narrow-energy-gap material as a host for producing NIR hyperfluorescence system, we fabricated a NIR-OLED exhibiting intense emission at 930 nm with a high external electroluminescence quantum efficiency of more than 1&#37; at a current density of 100 milliamperes per square meter without any degradation even after more than 300 hours of operation. The NIR-OLEDs were integrated with dense complementary metal-oxide semiconductor circuits to make a micro-NIR-OLED projector (0.21 inch, 230,400 pixels). By actively driving the projector on a pixel by pixel and projecting their emission onto objects, we successfully scanned and sensed the surfaces in three dimensions with invisible NIR.

    DOI: 10.1126/sciadv.adj6583

  • Advanced Molecular Design for Efficient Multicolor Electrochemiluminescence and Amplified Spontaneous Emission based on Tetra-BF2 Complexes 査読

    Luxia Cui, Ami Horioka, Ryoichi Ishimatsu, Masashi Mamada, Chihaya Adachi, Keishiro Tahara, Yu Hoshino, Toshikazu Ono

    Advanced Optical Materials   2024年1月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Abstract

    Advanced organoboron dyes, incorporating tetra‐boron difluoride (tetra‐BF2) moieties, are developed, demonstrating efficient electrochemiluminescence (ECL) emissions in the green to orange regions through direct ion annihilation. By introducing diverse alkyl modifications in the molecules, luminescence color tuning is achieved via alterations in conjugation and bending angle. A photoluminescence quantum yield of 100&#37; in dilute solutions is successfully achieved. Notably, the introduction of alkyl groups to the methine side stabilizes the radical ionic state, resulting in a high ECL efficiency of 74&#37; through an efficient radical‐ion annihilation pathway. The key factor is that the energy of the annihilation reaction exceeds the S1 energy required for luminescence. Spin density calculations further elucidate the substituent effects on the radical ions of complexes. Moreover, the lasing properties of these materials in the solution‐processed blend films are investigated, revealing a low amplified spontaneous emission (ASE) threshold (Eth) of 6.40 ± 0.24 µJ cm−2, which is notably lower among organic laser materials. This is attributed to their large Stokes shifts and high quantum yield. The excellent ECL and ASE performances establish these materials as a valuable addition to the existing library of organoboron dyes, offering fresh insights into the development of organic solid‐state lasers.

    DOI: 10.1002/adom.202302803

  • Efficient, narrow-band, and stable electroluminescence from organoboron-nitrogen-carbonyl emitter 査読

    Ying-Chun Cheng, Xun Tang, Kai Wang, Xin Xiong, Xiao-Chun Fan, Shulin Luo, Rajat Walia, Yue Xie, Tao Zhang, Dandan Zhang, Jia Yu, Xian-Kai Chen, Chihaya Adachi, Xiao-Hong Zhang

    Nature Communications   15 ( 1 )   2024年1月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Abstract

    Organic light-emitting diodes (OLEDs) exploiting simple binary emissive layers (EMLs) blending only emitters and hosts have natural advantages in low-cost commercialization. However, previously reported OLEDs based on binary EMLs hardly simultaneously achieved desired comprehensive performances, e.g., high efficiency, low efficiency roll-off, narrow emission bands, and high operation stability. Here, we report a molecular-design strategy. Such a strategy leads to a fast reverse intersystem crossing rate in our designed emitter h-BNCO-1 of 1.79×105 s−1. An OLED exploiting a binary EML with h-BNCO-1 achieves ultrapure emission, a maximum external quantum efficiency of over 40&#37; and a mild roll-off of 14&#37; at 1000 cd·m−2. Moreover, h-BNCO-1 also exhibits promising operational stability in an alternative OLED exploiting a compact binary EML (the lifetime reaching 95&#37; of the initial luminance at 1000 cd m−2 is ~ 137 h). Here, our work has thus provided a molecular-design strategy for OLEDs with promising comprehensive performance.

    DOI: 10.1038/s41467-024-44981-1

  • Judicious Design of Pyridine‐Based Hosts for Stable, Efficient, and Low‐Driving Thermally Activated Delayed Fluorescence Organic Light‐Emitting Diodes 査読

    Yanmei Hu, Alexander Civil, Yufang Li, Gerardus N. Iswara Lestanto, Youichi Tsuchiya, Chin‐Yiu Chan, Chihaya Adachi

    Advanced Optical Materials   2024年1月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Abstract

    Although thermally activated delayed fluorescence (TADF) based organic light‐emitting diodes (OLEDs) continue to achieve high efficiencies, their device stability still does not necessarily meet industrial standards. To improve device stability, careful design of a stable host material is crucial. Herein, with reference to a common p‐type host material, 3,3′‐di(9H‐carbazol‐9‐yl)‐1,1′‐biphenyl (mCBP), three novel host materials based on a pyridine unit, mCBP‐1N, CzPyPhCz, and CzPyBF, are systematically designed to improve the stabilities efficiently. The green and blue TADF OLEDs are fabricated with these three new hosts. The maximum external quantum efficiencies (EQEmaxs) of green OLEDs are 20.3 &#37; and 14.0&#37; for CzPyBF and mCBP hosts, respectively. Further, high EQEs of 19.2&#37; and 12.9&#37; are maintained even at 1000 cd m−2. Most importantly, the device lifetime of the CzPyBF host can achieve LT95 of 62.7 h, which is 2.5 times longer than that of mCBP. Also, lower turn‐on voltages are achieved by using CzPyPhCz in blue and green devices. With host engineering, the TADF OLEDs are simultaneously improved with lower turn‐on voltages, higher EQEs, and longer device lifetimes.

    DOI: 10.1002/adom.202302971

  • Rigorous Determination of Dipole Orientation in Organic Thin Films Using Angle-Dependent Photoluminescence 査読

    Yeonghoon Jin, Hyung Suk Kim, Donggyun Lee, Chihaya Adachi, Seunghyup Yoo, Kyoungsik Yu

    The Journal of Physical Chemistry C   128 ( 4 )   1755 - 1761   2024年1月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.jpcc.3c06330

  • Indication of Intramolecular Triplet-Triplet Annihilation Upconversion in Organic Light-Emitting Diodes (Advanced Optical Materials 3/2024)

    Sasaki, S; Goushi, K; Mamada, M; Miyazaki, S; Miyata, K; Onda, K; Adachi, C

    ADVANCED OPTICAL MATERIALS   12 ( 3 )   2024年1月   ISSN:2195-1071

  • The role of spontaneous orientation polarization on charge storage behavior at an interface between organic semiconductor layers 査読

    Yamanaka, T; Nakanotani, H; Adachi, C

    JOURNAL OF MATERIALS CHEMISTRY C   12 ( 3 )   1055 - 1060   2023年12月   ISSN:2050-7526 eISSN:2050-7534

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    記述言語:その他   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Materials Chemistry C  

    Optically generated carriers are pinned at the organic/organic interface if the two organic layers have a large polarization difference, underlining that the combination of polar molecules is crucial to extend the carrier lifetime.

    DOI: 10.1039/d3tc03979j

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  • A Rigid Multiple Resonance Thermally Activated Delayed Fluorescence Core Toward Stable Electroluminescence and Lasing 査読

    Xun Tang, Mingchen Xie, Zesen Lin, Kirill Mitrofanov, Tuul Tsagaantsooj, Yi‐Ting Lee, Ryota Kabe, Atula S. D. Sandanayaka, Toshinori Matsushima, Takuji Hatakeyama, Chihaya Adachi

    Angewandte Chemie International Edition   63 ( 2 )   2023年12月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Abstract

    The investigation of organic light‐emitting diodes (OLEDs) and organic laser devices with thermally activated delayed fluorescence (TADF) molecules is emerging due to the potential of harnessing triplets. In this work, a boron/nitrogen multiple‐resonance TADF polycyclic framework fusing carbazole units (CzBNPh) was proposed. CzBNPh exhibited a narrowband emission (<30 nm), a unity photoluminescence quantum yield, and a fast radiative rate. Consequently, CzBNPh demonstrated a low distributed feedback (DFB) lasing threshold of 0.68 μJ cm−2. Furthermore, the stimulated emission zone of CzBNPh was effectively separated from its singlet and triplet absorption, thereby minimizing the singlet‐triplet annihilation under long‐pulsed excitation ranging from 20 μs to 2.5 ms. Significantly, the enhanced rigid molecular conformation, thermal stability, and photo‐stability resulted in improved lasing and electroluminescence stability compared to that of 5,9‐diphenyl‐5,9‐diaza‐13b‐boranaphtho[3,2,1‐de]anthracene (DABNA)‐core. These findings indicate the potential of CzBN‐core as a promising framework for achieving long‐pulsed wave and electrically‐pumped lasing in the future.

    DOI: 10.1002/anie.202315210

  • A polar transition of spontaneous orientation polarization in organic amorphous thin films 査読

    Yuuhi Ueda, Masaki Tanaka, Hajime Nakanotani, Chihaya Adachi

    Chemical Physics Letters   833   140915 - 140915   2023年12月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.cplett.2023.140915

  • Luminescence mechanism analysis of a TADF molecule showing peculiar thermal behavior 査読

    Youichi Tsuchiya, Keito Mizukoshi, Masaki Saigo, Tomohiro Ryu, Kiyoshi Miyata, Ken Onda, Chihaya Adachi

    Faraday Discussions   250   233 - 250   2023年11月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    9-[1,4]Benzoxaborino[2,3,4-kl]phenoxaborine-7-yl-1,3,6,8-tetramethyl-9H-carbazole, a donor–acceptor linked TADF molecule with a very short delay lifetime of 750 ns, exhibits a peculiar thermal behavior similar to that of negative gap materials.

    DOI: 10.1039/d3fd00151b

  • Comparison of Exciton Annihilation Processes in Prototypical Charge-Transfer Molecules 査読

    Hyung Suk Kim, Sang Hoon Lee, Chihaya Adachi

    The Journal of Physical Chemistry C   128 ( 3 )   994 - 1002   2023年11月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.jpcc.3c06465

  • Light blue rigid excited-state intramolecular proton transfer organic semiconductor laser chromophores 査読

    Ilene Allison, Mashashi Mamada, Atul Shukla, Sarah K. M. McGregor, Ras Baizureen Roseli, Innes Gale, Vijay P. Rahane, Evan G. Moore, Elizabeth H. Krenske, Nidhi Jain, Chihaya Adachi, Ebinazar B. Namdas, Shih-Chun Lo

    Journal of Materials Chemistry C   11 ( 45 )   15861 - 15872   2023年11月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    The effect of excited-state intramolecular proton-transfer (ESIPT) laser material rigidity on photophysical properties and amplified spontaneous emission (ASE) thresholds (EASEth) is studied.

    DOI: 10.1039/d3tc02707d

  • Permeation of oxygen and water into a plasma-enhanced chemical vapor deposited silicon nitride film as function of deposition pressure 査読

    Masayuki Shiochi, Hiroshi Fujimoto, Hin Wai Mo, Keiko Inoue, Yusaku Tanahashi, Hiroyuki Hosomi, Takashi Miyamoto, Hiroshi Miyazaki, Chihaya Adachi

    Journal of Vacuum Science &amp; Technology B   41 ( 6 )   2023年10月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    In this work, we demonstrate that the permeability of a SiNx thin film (prepared by plasma-enhanced chemical vapor deposition) to water and oxygen is closely related to the deposition pressure. By dynamic secondary ion mass spectrometry, we confirmed that water penetration occurs into the SiNx film only in the oxidized layer. Furthermore, positron annihilation lifetime spectroscopy indicated that a SiNx film with a lower deposition pressure provides a smaller pore (free volume hole) radius, which is more effective in terms of blocking ambient molecular diffusion or penetration. The SiNx films were also applied as an encapsulation layer for organic light-emitting diodes; SiNx films with a lower deposition pressure exhibited higher encapsulation properties.

    DOI: 10.1116/6.0003050

  • Indication of Intramolecular Triplet–Triplet Annihilation Upconversion in Organic Light‐Emitting Diodes 査読

    Shoma Sasaki, Kenichi Goushi, Masashi Mamada, Shiori Miyazaki, Kiyoshi Miyata, Ken Onda, Chihaya Adachi

    Advanced Optical Materials   12 ( 3 )   2023年10月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Abstract

    It is well known that triplet–triplet annihilation upconversion (TTU) can enhance electroluminescence (EL) efficiency by converting two low‐energy triplet excitons into one high‐energy singlet exciton. However, conventional intermolecular TTU requires high doping concentration to activate, limiting device architecture. Here, six dimer molecules comprised of two anthracene units connected by a spacer unit are investigated, which have a possibility of the intramolecular TTU process. As a result, two dimer molecules show high TTU efficiencies close to the theoretical maximum even in dispersed, diluted conditions. By comparing these molecular conformations, a correlation is found between the dimer structures of two anthracene units and the TTU activity in the diluted condition, i.e., the 3D molecular structure with the exciton utilizing efficiency.

    DOI: 10.1002/adom.202301924

  • Double-locked narrowband hybrid locally-excited and charge-transfer emitter exhibiting amplified spontaneous emission 査読

    Long Chen, Xun Tang, Ruihong Liu, Qi Zheng, Youjun Yu, Dongying Zhou, Shengyi Yang, Chihaya Adachi, Liangsheng Liao, Zuoquan Jiang

    The Innovation Materials   1 ( 2 )   100026 - 100026   2023年9月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    <p lang="en"><p>Hybrid Locally-excited and Charge-Transfer (HLCT) materials have garnered significant attention for their high exciton utilization efficiency in organic light-emitting diodes (OLEDs). However, conventional HLCT materials suffer from broad emission, which limits their applications. In this study, we report a narrowband HLCT emitter, namely 10-(dimesitylboranyl)-8,8,12,12-tetraphenyl-8,12-dihydrobenzo[9,1]quinolizino[3,4,5,6,7-klmn]phenoxazine (PXZ-DL), incorporated by double-locked intramolecular connection. PXZ-DL exhibits a narrow emission spectrum with a small full width at half-maximum (FWHM) of 35 nm and 47 nm in solution and as an OLED emitter, respectively. Moreover, PXZ-DL demonstrates a high photoluminescence quantum yield of 100&#37; and an external quantum efficiency of 8.0&#37;. Additionally, PXZ-DL demonstrates excellent performance in amplified spontaneous emission with a low threshold of 5.7 ��J cm-2 and a narrow FWHM of 11 nm. The intramolecular lock strategy offers a promising approach for the development of HLCT materials with high color purity.</p></p>

    DOI: 10.59717/j.xinn-mater.2023.100026

  • Abrupt exciton quenching in blue fluorescent organic light-emitting diodes around turn-on voltage region 査読

    Shunta Kakumachi, Thanh Ba Nguyen, Hajime Nakanotani, Chihaya Adachi

    Chemical Engineering Journal   471   144516 - 144516   2023年9月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.cej.2023.144516

  • Anti‐Stokes Luminescence in Multi‐Resonance‐Type Thermally‐Activated Delayed Fluorescence Molecules 査読

    Shintaro Kohata, Hajime Nakanotani, Youhei Chitose, Takuma Yasuda, Youichi Tsuchiya, Chihaya Adachi

    Angewandte Chemie International Edition   62 ( 44 )   2023年9月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Abstract

    Photon‐upconversion in organic molecular systems is one of the promising technologies for future energy harvesting systems because these systems can generate excitons that possess higher energy than excitation energy. The photon‐upconversion caused by absorbing ambient heat as additional energy is particularly interesting because it could ideally provide a light‐driving cooling system. However, only a few organic molecular systems have been reported. Here, we report the anti‐Stokes photoluminescence (ASPL) derived from hot‐band absorption in a series of multi‐resonance‐type thermally‐activated delayed fluorescence (MR‐TADF) molecules. The MR‐TADF molecules exhibited an anti‐Stokes shift of approximately 0.1 eV with a high PL quantum yield in the solution state. The anti‐Stokes shift corresponded well to the 1–0 vibration transition from the ground state to the excited singlet state, and we further evaluated a correlation between the activation energy for the ASPL intensity and the TADF process. Our demonstration underlines that MR‐TADF molecules have become a novel class of ASPL materials for various future applications, such as light‐driving cooling systems.

    DOI: 10.1002/anie.202312326

  • Investigation of Charge Transport Properties in a 2D Dion–Jacobson Halide Perovskite Based on Terphenyl Dications 査読

    Xuelong Liu, Narayanaswamy Kamatham, Zhangsheng Shi, Shidong Yu, Qing Ren, Kentaro Imaoka, Chin-Yiu Chan, Benoît Heinrich, Robin Troiville-Cazilhac, Lise-Marie Chamoreau, Lydia Sosa Vargas, David Kreher, Youichi Tsuchiya, Toshinori Matsushima, Xiankai Chen, Fabrice Mathevet, Chihaya Adachi

    ACS Materials Letters   5 ( 8 )   2148 - 2155   2023年7月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsmaterialslett.3c00509

  • Exciton Dynamics and Optically Pumped Lasing in 1‐Naphthylmethylamine‐Based Quasi‐2D Perovskite Films 査読

    Ryotaro Nasu, Xun Tang, Satoru Watanabe, Chathuranganie A. M. Senevirathne, Ganbaatar Tumen‐Ulzii, Toshinori Matsushima, Chihaya Adachi

    Advanced Functional Materials   33 ( 44 )   2023年7月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Abstract

    Films of the quasi‐2D perovskite based on 1‐naphthylmethylamine (NMA) are promising as the gain medium for optically pumped lasing and future electrically pumped lasing because of its low lasing threshold and small electroluminescence efficiency rolloff. However, reasons for the low threshold and small efficiency rolloff are still unclear. Therefore, exciton dynamics are investigated in NMA‐based quasi‐2D perovskite films. It is found that quenching of bright excitons by other excitons or charge carriers is unlikely in NMA‐based quasi‐2D perovskite films, which is one reason for the low lasing threshold and small efficiency rolloff. Moreover, thermally stimulated current measurements reveal that the defect levels inside the band gap of the NMA‐based quasi‐2D perovskite are shallow, with a depth of ≈0.3 eV, causing a decrease in nonradiative exciton recombination through the defects. Therefore, population inversion can be easily achieved, leading to the low lasing threshold as well. For fabrication of NMA‐based quasi‐2D perovskite laser devices with even lower lasing thresholds, a circular‐shaped optical resonator, and small‐molecule‐based defect passivation are used. Optically pumped lasing can be obtained from these devices, with a threshold of ≈1 µJ cm−2, which is one of the lowest values ever reported in any perovskite lasers.

    DOI: 10.1002/adfm.202301794

  • Effect of Hydrogen Bonding on Thermally Activated Delayed Fluorescence Behaviors Based on a Study of Hydrate Crystals

    Mamada, M; Katagiri, H; Adachi, C

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   14 ( 22 )   5221 - 5225   2023年6月   ISSN:1948-7185

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    記述言語:英語   出版者・発行元:Journal of Physical Chemistry Letters  

    Reverse intersystem crossing (RISC) in purely organic molecules has become an attractive research topic since the demonstration of high efficiencies in organic light-emitting diodes using thermally activated delayed fluorescence (TADF). Although the intermolecular interactions have a significant impact on the exciton dynamics, it is generally difficult to identify the quantitative relationship associated with a specific factor. In this work, we used a clathrate crystal with TADF and H2O molecules to evaluate the effect of hydrogen bonding while maintaining molecular conformations and other intermolecular interactions. The hydrogen bonding shifted the charge transfer excited states to lower energies, resulting in superior TADF properties. Although the increase in the RISC rate is considered to enhance the stabilities of TADF molecules, photostability analysis revealed nearly the same degradation speed despite the 3 times faster RISC rate.

    DOI: 10.1021/acs.jpclett.3c00915

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  • Oxygen‐Induced Reversible Degradation of Perovskite Solar Cells 査読

    Badamgarav Purev-Ochir, Xuelong Liu, Yuki Fujita, Dai Semba, Telugu Bhim Raju, Ganbaatar Tumen-Ulzii, Atsushi Wachi, Hiroshi Sato, Toshinori Matsushima, Chihaya Adachi

    Solar RRL   7 ( 14 )   2023年6月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    After remarkable progress over the past decades, perovskite solar cells (PSCs) currently exhibit efficient solar power conversion efficiency. However, the environmental instability of perovskite materials and devices is still a serious issue, impeding the future commercialization of this technology. Herein, why PSCs degrade in air is investigated and it is found that one of the critical reasons for the air‐induced PSC degradation is the doping of the 2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobi‐fluorene (spiro‐OMeTAD) hole‐transport layer with oxygen. Photoelectron yield spectroscopy reveals that the hole‐transport level of the spiro‐OMeTAD layer becomes deeper by oxygen doping, increasing an energy barrier for hole extraction. In other words, decreased hole extraction at the perovskite/spiro‐OMeTAD interface induces the degradation of PSCs in air. However, this oxygen‐induced degradation of PSCs is reversible to some extent by storing PSCs in a vacuum to remove oxygen. In contrast, no detectable degradation of the perovskite light absorber is observed after ≈600 h of air exposure from the results of morphological and structural characterizations. These aspects provide a deeper understanding of PSCs degradation, giving insight into improving long‐term durability in air in the future.

    DOI: 10.1002/solr.202300127

  • Multiple donor–acceptor design for highly luminescent and stable thermally activated delayed fluorescence emitters

    Madushani, B; Mamada, M; Goushi, K; Nguyen, TB; Nakanotani, H; Kaji, H; Adachi, C

    SCIENTIFIC REPORTS   13 ( 1 )   7644   2023年5月   ISSN:2045-2322 eISSN:2045-2322

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    記述言語:その他   掲載種別:研究論文(学術雑誌)   出版者・発行元:Scientific Reports  

    Abstract

    A considerable variety of donor–acceptor (D–A) combinations offers the potential for realizing highly efficient thermally activated delayed fluorescence (TADF) materials. Multiple D–A type compounds are one of the promising families of TADF materials in terms of stability as well as efficiencies. However, those emitters are always composed of carbazole-based donors despite a wide choice of moieties used in linearly linked single D–A molecules. Herein, we developed a multiple D–A type TADF compound with two distinct donor units of 9,10-dihydro-9,9-dimethylacridine (DMAC) and carbazole as the hetero-donor design. The new emitter exhibits high photoluminescence quantum yield (PLQY) in various conditions including polar media blend and high concentrations. Organic light-emitting diodes (OLEDs) showed a reasonably high external quantum efficiency (EQE). In addition, we revealed that the multiple-D–A type molecules showed better photostability than the single D–A type molecules, while the operational stability in OLEDs involves dominant other factors.

    DOI: 10.1038/s41598-023-34623-9

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    その他リンク: https://www.nature.com/articles/s41598-023-34623-9

  • Development of a new hole transport material for perovskite solar cells 査読

    Ganbaatar Tumen-Ulzii, Kotaro Takekuma, Yuki Fujita, Dai Senba, Chathuranganie A. M. Senevirathne, Yi-Ting Lee, Atsushi Wachi, Hiroshi Sato, Toshinori Matsushima, Chihaya Adachi

    Applied Physics Letters   122 ( 20 )   2023年5月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    N,N-di(4-methoxyphenyl)amino-9,9′-spirobifluorene (spiro-OMeTAD) is a widely used hole transport layer (HTL) material for emerging lead halide hybrid perovskite solar cells (PSCs). Finding alternative HTL materials is required for the future development of more efficient and stable PSCs. Here, we developed a new HTL material of N2,N2,N,7N7-tetrakis(4-methoxyphenyl)benzo[b]benzo[4,5]thieno[2,3-d]thiophene-2,7-diamine (TBTD). Chemically doped TBTD provided better hole extraction in PSCs than chemically doped spiro-OMeTAD due to higher electrical conductivity and a more suitable hole transport energy level. Thus, PSCs with the TBTD HTL showed higher power conversion efficiency (∼21&#37;) than spiro-OMeTAD HTL (∼19&#37;). The operational stability of TBTD-based PSCs was similar to that of spiro-OMeTAD-based PSCs. The findings discussed in this study will aid in the future development of high-performance PSCs.

    DOI: 10.1063/5.0150066

  • Enhancing Triplet–Triplet Upconversion Efficiency and Operational Lifetime in Blue Organic Light-Emitting Diodes by Utilizing Thermally Activated Delayed Fluorescence Materials 査読

    Thanh B. Nguyen, Hajime Nakanotani, Chin-Yiu Chan, Shunta Kakumachi, Chihaya Adachi

    ACS Applied Materials &amp; Interfaces   15 ( 19 )   23557 - 23563   2023年5月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsami.3c02855

  • Highly efficient light harvesting of a Eu(iii) complex in a host–guest film by triplet sensitization 査読

    Shiori Miyazaki, Kenichi Goushi, Yuichi Kitagawa, Yasuchika Hasegawa, Chihaya Adachi, Kiyoshi Miyata, Ken Onda

    Chemical Sciences   2023年5月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Highly efficient light harvesting of a Eu(iii) complex in a host–guest film by triplet sensitization
    Very high photoluminescence intensity of a Eu(iii) complex is achieved using a host–guest system. The intensity is 400 times larger than that of the Eu(iii) complex itself.

    DOI: 10.1039/D3SC01817B

  • Color tuning of multi-resonant thermally activated delayed fluorescence emitters based on fully fused polycyclic amine/carbonyl frameworks 査読

    John Marques dos Santos, Chin-Yiu Chan, Shi Tang, David Hall, Tomas Matulaitis, David B. Cordes, Alexandra M. Z. Slawin, Youichi Tsuchiya, Ludvig Edman, Chihaya Adachi, Yoann Olivier, Eli Zysman-Colman

    Journal of Materials Chemistry C   11 ( 24 )   8263 - 8273   2023年5月

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    Two newly developed carboynyl-based multi-resonant TADF show bright green-yellow emission. These were used as emitters in both OLEDs, and LECs.

    DOI: 10.1039/d3tc00641g

  • Progress and Perspective toward Continuous‐Wave Organic Solid‐State Lasers

    Xun Tang, Chathuranganie A. M. Senevirathne, Toshinori Matsushima, Atula S. D. Sandanayaka, Chihaya Adachi

    Advanced Materials   2023年5月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adma.202211873

  • Post-Modification of Pyrrolopyrrole Aza-BODIPY toward High Near-Infrared Fluorescence Brightness

    Yitong Wang, Shigeki Mori, Hajime Nakanotani, Chihaya Adachi, Soji Shimizu

    Organic Letters   25 ( 17 )   3040 - 3044   2023年4月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.orglett.3c00848

  • A Donor–Acceptor Cage for Thermally Activated Delayed Fluorescence: toward a New Kind of TADF Exciplex Emitters

    Lihua Chen, Chuanlong Li, Enguang Fu, Mengyang Li, Yoshiaki Kuboi, Zi-Ying Li, Zhenghong Chen, Jiaolong Chen, Xuelong Liu, Xun Tang, Lucas Frédéric, François Maurel, Chihaya Adachi, Fabrice Mathevet, Shaodong Zhang

    ACS Materials Letters   5 ( 5 )   1450 - 1455   2023年4月

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    DOI: 10.1021/acsmaterialslett.3c00310

  • Room-Temperature Continuous-Wave Microcavity Lasers from Solution-Processed Smooth Quasi-2D Perovskite Films with Low Thresholds

    Gao, X; Lin, J; Guo, XY; He, G; Zou, DY; Ishii, T; Zhang, DZ; Zhao, CY; Zhan, HM; Huang, JS; Liu, XY; Adachi, C; Qin, CJ; Wang, LX

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   14 ( 10 )   2493 - 2500   2023年3月   ISSN:1948-7185 eISSN:1948-7185

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Physical Chemistry Letters  

    Continuous-wave (CW) lasing in quasi-two-dimensional (2D) perovskite-based distributed feedback cavities has been achieved at room temperature; however, CW microcavity lasers comprising distributed Bragg reflectors (DBRs) have rarely been prepared using solution-processed quasi-2D perovskite films because the roughness of perovskite films significantly increases intersurface scattering loss in the microcavity. Herein, high-quality spin-coated quasi-2D perovskite gain films were prepared using an antisolvent to reduce roughness. The highly reflective top DBR mirrors were deposited via room-temperature e-beam evaporation to protect the perovskite gain layer. Lasing emission of the prepared quasi-2D perovskite microcavity lasers under CW optical pumping was clearly observed at room temperature, featuring a low threshold of ∼1.4 W cm-2 and beam divergence of ∼3.5°. It was concluded that these lasers originated from weakly coupled excitons. These results elucidate the importance of controlling the roughness of quasi-2D films to achieve CW lasing, thus facilitating the design of electrically pumped perovskite microcavity lasers.

    DOI: 10.1021/acs.jpclett.3c00279

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  • Organic Binary and Ternary Cocrystal Engineering Based on Halogen Bonding Aimed at Room‐Temperature Phosphorescence

    Ayano Abe, Kenichi Goushi, Masashi Mamada, Chihaya Adachi

    Advanced Materials   2023年3月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adma.202211160

  • Artificial p–n‐like Junction Based on Pure 2D Organic–Inorganic Halide Perovskite Structure Having Naphthalene Diimide Acceptor Moieties

    Zhao Feng, Xuelong Liu, Kentaro Imaoka, Tomohiro Ishii, Ganbaatar Tumen‐Ulzii, Xun Tang, George F. Harrington, Benoît Heinrich, Jean‐Charles Ribierre, Lise‐Marie Chamoreau, Lydia Sosa Vargas, David Kreher, Kenichi Goushi, Toshinori Matsushima, Guijiang Zhou, Fabrice Mathevet, Chihaya Adachi

    Advanced Optical Materials   11 ( 10 )   2023年3月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adom.202202734

  • Donor Influence on the Optoelectronic Properties of N‐Substituted Tetraphenylimidazole Derivatives

    Tomas Matulaitis, Paloma L. dos Santos, Youichi Tsuchiya, David B. Cordes, Alexandra M. Z. Slawin, Chihaya Adachi, Ifor D. W. Samuel, Eli Zysman‐Colman

    ChemistrySelect   8 ( 9 )   2023年2月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/slct.202300274

  • Classic Fluorophores With a Horizontal Alignment for Enhancing Light Outcoupling Efficiency (≈30&#37;) and External Quantum Efficiency (≈7&#37;) of Near Ultraviolet (λ max  < 400 nm) Organic Light‐Emitting Diodes

    Jian Haur Lee, Jing‐Xiang Huang, Chia‐Hsun Chen, Yi‐Ting Lee, Chin‐Yiu Chan, Yi‐Chung Dzeng, Po‐Wen Tang, Chi Chen, Chihaya Adachi, Tien‐Lung Chiu, Jiun‐Haw Lee, Chin‐Ti Chen

    Advanced Optical Materials   11 ( 8 )   2023年2月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adom.202202666

  • Ultrapure green organic light-emitting diodes based on highly distorted fused π-conjugated molecular design

    Xiao-Chun Fan, Kai Wang, Yi-Zhong Shi, Ying-Chun Cheng, Yi-Ting Lee, Jia Yu, Xian-Kai Chen, Chihaya Adachi, Xiao-Hong Zhang

    Nature Photonics   17 ( 3 )   280 - 285   2023年1月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s41566-022-01106-8

  • Electron Lifetime of Over One Month in Disordered Organic Solid‐State Films

    Takahiko Yamanaka, Hajime Nakanotani, Katsuhiro Nakamoto, Chihaya Adachi

    Advanced Materials   35 ( 11 )   2023年1月

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    DOI: 10.1002/adma.202210335

  • Twisting of Porphyrin by Assembly in a Metal‐Organic Framework yielding Chiral Photoconducting Films for Circularly‐Polarized‐Light Detection

    Chun Li, Henrik Schopmans, Lukas Langer, Stefan Marschner, Abhinav Chandresh, Jochen Bürck, Youichi Tsuchiya, Adachi Chihaya, Wolfgang Wenzel, Stefan Bräse, Mariana Kozlowska, Lars Heinke

    Angewandte Chemie International Edition   62 ( 10 )   2023年1月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/anie.202217377

  • Solvent-dependent dual emission processes in charge-transfer excited states of phenothiazine-triphenyltriazine conformers 査読

    Tomohiro Ryu, Kiyoshi Miyata, Masaki Saigo, Yuushi Shimoda, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi, Ken Onda

    Chemical Physics Letters   809   140155 - 140155   2022年12月

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    DOI: 10.1016/j.cplett.2022.140155

  • A Materials Acceleration Platform for Organic Laser Discovery

    Tony C Wu, Andrés Aguilar‐Granda, Kazuhiro Hotta, Sahar Alasvand Yazdani, Robert Pollice, Jenya Vestfrid, Han Hao, Cyrille Lavigne, Martin Seifrid, Nicholas Angello, Fatima Bencheikh, Jason E. Hein, Martin Burke, Chihaya Adachi, Alán Aspuru‐Guzik

    Advanced Materials   35 ( 6 )   2207070 - 2207070   2022年12月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adma.202207070

  • Defect Passivation by Pyridine-Carbazole Molecules for Efficient and Stable Perovskite Solar Cells

    Ganbaatar Tumen-Ulzii, Morgan Auffray, Dino Klotz, George F. Harrington, Xian Kai Chen, Umamahesh Balijapalli, Veeramani Vediyappan, Nozomi Nakamura, Zhao Feng, Kotaro Takekuma, Yuki Fujita, Pangpang Wang, Sunao Yamada, Kaoru Tamada, Munkhbayar Batmunkh, Yu Lin Zhong, Fabrice Mathevet, Hayden Salway, Miguel Anaya, Samuel D. Stranks, Toshinori Matsushima, Chihaya Adachi

    ACS Applied Energy Materials   5 ( 12 )   15819 - 15827   2022年12月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    The defects in the light-harvesting perovskite absorber layer play a key role in limiting power conversion efficiencies (PCEs) and long-term stability of lead halide perovskite solar cells (PSCs). Although organic ammonium halides have been used for defect passivation in high-performance PSCs, the stability issue is still a challenge. Herein, we develop a novel material of pyridine-carbazole (Py-Cz) to passivate defects via coordination bonding. With this passivation, the photoluminescence intensity of perovskite films was increased. In addition, the formation of under-coordinated Pb2+defects in perovskite films was reduced significantly, enabling high-performance and long-term stable PSCs. Three different sets of PSCs were constructed, namely, without passivation, with phenethylammonium iodide (PEAI) (commonly used for passivation), and with Py-Cz passivation. Remarkably, the PSCs fabricated using the Py-Cz passivation not only achieved PCEs of over 20&#37; but also retained 85&#37; of their initial performances over more than 5000 h. In contrast, the PSCs without or with PEAI passivation degraded quickly during the long-term operational stability test under light illumination. This method opens up a new opportunity to develop highly efficient and operationally stable PSCs.

    DOI: 10.1021/acsaem.2c03364

  • Sequential Multiple Borylation Toward an Ultrapure Green Thermally Activated Delayed Fluorescence Material

    Shigetada Uemura, Susumu Oda, Masahiro Hayakawa, Ryosuke Kawasumi, Naoya Ikeda, Yi-Ting Lee, Chin-Yiu Chan, Youichi Tsuchiya, Chihaya Adachi, Takuji Hatakeyama

    Journal of the American Chemical Society   145 ( 3 )   1505 - 1511   2022年12月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jacs.2c10946

  • Trifluoromethylated thermally activated delayed fluorescence molecule as a versatile photocatalyst for electron-transfer- and energy-transfer-driven reactions

    Tatsuya Morofuji, Takuma Kurokawa, Youhei Chitose, Chihaya Adachi, Naokazu Kano

    Organic &amp; Biomolecular Chemistry   20 ( 48 )   9600 - 9603   2022年11月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Trifluoromethylated thermally activated delayed fluorescent molecule 4[Cz(CF3)2]IPN has been demonstrated as a versatile photocatalyst that facilitates radical reactions via electron transfer and dearomative cycloaddition via energy transfer.

    DOI: 10.1039/d2ob02055f

  • A very low lasing threshold of DABNA derivatives with DFB structures 査読

    Masashi Mamada, Satoshi Maedera, Susumu Oda, Thanh Ba Nguyen, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi

    Materials Chemistry Frontiers   7 ( 2 )   259 - 266   2022年11月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    A low lasing threshold of up to 0.27 μJ cm−1 was achieved by using TADF materials. Advanced light amplification architectures composed of dual DABNA derivatives were also demonstrated.

    DOI: 10.1039/d2qm01040b

  • Control of emission diffraction angles and laser threshold in mixed-order sampled distributed feedback laser with organic gain media

    H. Park, S. Alasvand Yazdani, F. Bencheikh, R. Komatsu, S. Yokoyama, T. Kamiya, C. Adachi

    Journal of Applied Physics   132 ( 20 )   203101 - 203101   2022年11月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    The control of laser emission angles in laser devices is essential for many optoelectronic and photonic applications such as optical sensing and displays. In this context, we studied the light diffraction pattern of laser beams in a one-dimensional sampled distributed feedback resonator having organic gain media. The gratings consist of the repetition of supercells having a mixed-order sampled grating in which 1st-order gratings surround a 2nd-order grating. The experimental results showed that the diffraction angles of the laser beams are quite diverse depending on the supercell structures. We demonstrate that the interval of the diffraction angle (θ) of the laser beams is inversely proportional to the length of the supercell experimentally and theoretically. By tuning the length of supercells as well as the length of 1st-order and 2nd-order regions, the interval θ was tuned from 0.1° to 43° with the different arc emission patterns. With the reduction of θ, i.e., the longer 1st-order region, a significant decrease in the laser threshold was obtained, resulting in the lowest lasing threshold of 2.5 ± 0.1  μJ/cm2 with ∼3.5 ns of a long pulse width excitation source.

    DOI: 10.1063/5.0123476

  • Correlating Exciton Dynamics of Thermally Activated Delayed-Fluorescence Emitters to Efficiency Roll-Off in OLEDs

    Monirul Hasan, Atul Shukla, Masashi Mamada, Chihaya Adachi, Shih-Chun Lo, Ebinazar B. Namdas

    Physical Review Applied   18 ( 5 )   2022年11月

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    DOI: 10.1103/physrevapplied.18.054082

  • Highly Effective Thermally Activated Delayed Fluorescence Emitters Based on Symmetry and Asymmetry Nicotinonitrile Derivatives

    Min Gyeong Choi, Chan Hee Lee, Chihaya Adachi, Sae Youn Lee

    Molecules   27 ( 23 )   8274 - 8274   2022年11月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    In this study, we developed two thermally activated delayed fluorescence (TADF) emitters, ICzCN and ICzCYP, to apply to organic light-emitting diodes (OLEDs). These emitters involve indolocarbazole (ICz) donor units and nicotinonitrile acceptor units with a twisted donor-acceptor-donor (D-A-D) structure for small singlet (S1) and triplet (T1) state energy gap (ΔEST) to enable efficient exciton transfer from the T1 to the S1 state. Depending on the position of the cyano-substituent, ICzCN has a symmetric structure by introducing donor units at the 3,5-position of isonicotinonitrile, and ICzCYP has an asymmetric structure by introducing donor units at the 2,6-position of nicotinonitrile. These emitters have different properties, such as the maximum luminance (Lmax) value. The Lmax of ICzCN reached over 10000 cd m−2. The external quantum efficiency (ηext) was 14.8&#37; for ICzCN and 14.9&#37; for ICzCYP, and both achieved a low turn-on voltage (Von) of less than 3.4 eV.

    DOI: 10.3390/molecules27238274

  • Low-Voltage Driving Copper Iodide-Based Broadband Electroluminescence

    Rui Xu, Dingshuo Zhang, Junjie Si, Yihang Du, Qianqing Hu, Xiaoming Hao, Hong Zhao, Peiqing Cai, Qi Ai, Xin Yao, Yun Gao, Meiyi Zhu, Zenan Zhang, Muzhi Cai, Hin Wai Mo, Kentaro Harada, Zhizhen Ye, Xingliang Dai, Chihaya Adachi, Zugang Liu

    ACS Energy Letters   7 ( 12 )   4408 - 4416   2022年11月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsenergylett.2c02471

  • Modulation of Intersystem Crossing Rate Induced by Singlet-triplet Energy Level Alignment in 1,2,3,5-Tetrakis(carbazol-9-yl)-4,6-dicyanobenzene Single Crystals

    Shintaro Kohata, Hajime Nakanotani, Chihaya Adachi

    Chemistry Letters   51 ( 10 )   989 - 992   2022年10月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/cl.220304

  • Unexpected role of hole and electron blocking interlayers controlling charge carrier injection and transport in TADF based blue organic light-emitting diodes

    Masashi Mamada, Chihaya Adachi

    Applied Physics Letters   121 ( 13 )   131103 - 131103   2022年9月

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    There has been increasing interest in blue organic light-emitting diodes based on thermally activated delayed fluorescence (TADF). The construction of a fully optimized device architecture is crucial in accordance with developing high-performance materials because highly efficient electroluminescence cannot be realized without balancing both carrier injection and transport with decreasing several exciton loss processes. Thus, the detailed mechanism of carrier injection, transport, and recombination in emitting layers has to be clarified. In this study, various device architectures for a recently emerged blue TADF molecular system based on multiple donors and acceptors were systematically investigated, especially by focusing on the interlayers. This work also aims to offer guidelines for improving device stabilities. Our findings clarify the role of each layer, providing in-depth insight into device design and the selection of proper materials for each constituted layer.

    DOI: 10.1063/5.0100373

  • A convenient method to estimate the glass transition temperature of small organic semiconductor materials

    Tsuchiya, Y; Nakamura, N; Kakumachi, S; Kusuhara, K; Chan, CY; Adachi, C

    CHEMICAL COMMUNICATIONS   58 ( 80 )   11292 - 11295   2022年9月   ISSN:1359-7345 eISSN:1364-548X

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    記述言語:その他   掲載種別:研究論文(学術雑誌)   出版者・発行元:Chemical Communications  

    The convenient melt-blending method for DSC measurement provides the reliable glass transition temperature (Tg) of the materials which are hard to measure by the standard DSC measurement, e.g., organic semiconductors.

    DOI: 10.1039/d2cc01467j

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  • An Overlooked Charge‐Transfer Interaction in the Interfacial Triplet–Triplet Upconversion Process in Blue Organic Light‐Emitting Diodes 査読

    Thanh Ba Nguyen, Hajime Nakanotani, Chihaya Adachi

    Advanced Optical Materials   10 ( 18 )   2200704 - 2200704   2022年9月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adom.202200704

  • Multiple resonance type thermally activated delayed fluorescence by dibenzo [1,4] azaborine derivatives

    Jaehyun Bae, Mika Sakai, Youichi Tsuchiya, Naoki Ando, Xian-Kai Chen, Thanh Ba Nguyen, Chin-Yiu Chan, Yi-Ting Lee, Morgan Auffray, Hajime Nakanotani, Shigehiro Yamaguchi, Chihaya Adachi

    Frontiers in Chemistry   10   2022年9月

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    We studied the photophysical and electroluminescent (EL) characteristics of a series of azaborine derivatives having a pair of boron and nitrogen aimed at the multi-resonance (MR) effect. The computational study with the STEOM-DLPNO-CCSD method clarified that the combination of a BN ring-fusion and a terminal carbazole enhanced the MR effect and spin-orbit coupling matrix element (SOCME), simultaneously. Also, we clarified that the second triplet excited state (T2) plays an important role in efficient MR-based thermally activated delayed fluorescence (TADF). Furthermore, we obtained a blue–violet OLED with an external EL quantum efficiency (EQE) of 9.1&#37;, implying the presence of a pronounced nonradiative decay path from the lowest triplet excited state (T1).

    DOI: 10.3389/fchem.2022.990918

  • Tailor‐Made Multi‐Resonance Terminal Emitters toward Narrowband, High‐Efficiency, and Stable Hyperfluorescence Organic Light‐Emitting Diodes 査読

    Yi‐Ting Lee, Chin‐Yiu Chan, Masaki Tanaka, Masashi Mamada, Kenichi Goushi, Xun Tang, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi

    Advanced Optical Materials   10 ( 17 )   2200682 - 2200682   2022年9月

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    DOI: 10.1002/adom.202200682

  • Editorial: Driving Innovation in Organic Optoelectronic Materials With Physics-Based and Machine-Learning <i>De Novo</i> Methods

    Winget, P; Halls, MD; Gómez-Bombarelli, R; Adachi, C

    FRONTIERS IN CHEMISTRY   10   973254   2022年8月   ISSN:2296-2646

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    記述言語:英語   出版者・発行元:Frontiers in Chemistry  

    DOI: 10.3389/fchem.2022.973254

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  • Highly Efficient Deep‐Blue Organic Light‐Emitting Diodes Based on Rational Molecular Design and Device Engineering 査読

    Masashi Mamada, Hiroshi Katagiri, Chin‐Yiu Chan, Yi‐Ting Lee, Kenichi Goushi, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi

    Advanced Functional Materials   32 ( 32 )   2204352 - 2204352   2022年8月

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    DOI: 10.1002/adfm.202204352

  • Efficient and Bright Blue Thermally Activated Delayed Fluorescence from Light‐Emitting Electrochemical Cells

    Shi Tang, Petter Lundberg, Youichi Tsuchiya, Joan Ràfols‐Ribé, Yongfeng Liu, Jia Wang, Chihaya Adachi, Ludvig Edman

    Advanced Functional Materials   32 ( 44 )   2205967 - 2205967   2022年8月

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    DOI: 10.1002/adfm.202205967

  • OLEDが育んだ有機CT相互作用

    安達 千波矢

    応用物理   91 ( 7 )   386 - 390   2022年7月   ISSN:03698009 eISSN:21882290

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    記述言語:日本語   出版者・発行元:公益社団法人 応用物理学会  

    DOI: 10.11470/oubutsu.91.7_386

    CiNii Research

  • Two boron atoms versus one: high-performance deep-blue multi-resonance thermally activated delayed fluorescence emitters

    Chin-Yiu Chan, Subeesh Madayanad Suresh, Yi-Ting Lee, Youichi Tsuchiya, Tomas Matulaitis, David Hall, Alexandra M. Z. Slawin, Stuart Warriner, David Beljonne, Yoann Olivier, Chihaya Adachi, Eli Zysman-Colman

    Chemical Communications   58 ( 67 )   9377 - 9380   2022年7月

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    Two new deep-blue narrowband multi-resonant emitters, 1B-DTACrs and 2B-DTACrs, one of which shows TADF, based on boron, nitrogen, and oxygen doped nanographenes are reported.

    DOI: 10.1039/d2cc03347j

  • Balanced electron and hole injection and transport in OLEDs by using transparent electrodes

    Sahar Alasvand Yazdani, Fatima Bencheikh, Ryutaro Komatsu, Amir Mikaeili, Chihaya Adachi

    Japanese Journal of Applied Physics   61 ( 8 )   088002 - 088002   2022年7月

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    Abstract

    In this study, electron and hole injection, and transport in semi-transparent organic light-emitting diodes, including dielectric/metal/dielectric (DMD) electrodes, were investigated. The DMD electrode was modified by incorporating a 5 nm-thick Cs:MoOx layer and a 10 nm-thick 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HATCN) layer to improve the electron and hole injection in standard and inverse structures, respectively. The inverse structure showed a reasonably good and stable external quantum efficiency due to the well-balanced carrier densities at both low and high voltages which was confirmed by an electrical simulation study. Also, the peak position of the hole and electron recombination rate in the inverse structure was located on the ITO side, which is beneficial for reducing exciton quenching and photon absorption by metallic electrodes.

    DOI: 10.35848/1347-4065/ac7e96

  • Carbazole-2-carbonitrile as an acceptor in deep-blue thermally activated delayed fluorescence emitters for narrowing charge-transfer emissions 査読

    Chin-Yiu Chan, Yi-Ting Lee, Masashi Mamada, Kenichi Goushi, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi

    CHEMICAL SCIENCE   13 ( 26 )   7821 - 7828   2022年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    This work reports a new acceptor for constructing donor-acceptor type (D-A type) blue thermally activated delayed fluorescence (TADF) emitters with narrowed charge-transfer (CT) emissions. A new acceptor core, carbazole-2-carbonitrile (CCN), is formed by the fusion of carbazole and benzonitrile. Three D-A type TADF emitters based on the CCN acceptor, namely 3CzCCN, 3MeCzCCN, and 3PhCzCCN, have been successfully synthesized and characterized. These emitters show deep-blue emissions from 439 to 457 nm with high photoluminescence quantum yields of up to 85&#37; in degassed toluene solutions. Interestingly, all CCN-based deep-blue TADF emitters result in narrow CT emissions with full-width at half-maximums (FWHMs) of less than 50 nm in toluene solutions, which are pretty narrower compared with those of typical D-A type TADF emitters. Devices based on these emitters show high maximum external quantum efficiencies of up to 17.5&#37;.

    DOI: 10.1039/d2sc02478k

  • Impact of excitonic and photonic loss mechanisms on the threshold and slope efficiency of organic semiconductor lasers

    Sahar Alasvand Yazdani, Amir Mikaeili, Fatima Bencheikh, Chihaya Adachi

    Japanese Journal of Applied Physics   61 ( 7 )   074003 - 074003   2022年7月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Abstract

    We investigated the impact of various excitonic and photonic losses on the lasing threshold and slope efficiency of organic semiconductor lasers (OSLs) under optical and electrical excitations. The rate equations are solved numerically using the Euler method for an OSL and an organic semiconductor laser diode, including 4,4′-bis[(N-carbazole)styryl]biphenyl (BSB-Cz) as a gain medium. The results showed that the loss mechanisms that affect the exciton and photon densities cause an increase in the laser threshold and a decrease in the slope efficiency. Further, we demonstrated that by using a thermally activated delayed fluorescence (TADF) emitter as a gain medium, the triplet excitons could be harvested by increasing the reverse intersystem crossing rate (kRISC), resulting in an appreciable decrease of the laser threshold and an increase of the slope efficiency. Accordingly, the TADF emitters with a fast kRISC are expected to significantly reduce the current density required for electrical excitation.

    DOI: 10.35848/1347-4065/ac759d

  • Mechanistic dichotomy in the solvent dependent access to E vs. Z-allylic amines via decarboxylative vinylation of amino acids

    Samir Manna, Shunta Kakumachi, Kanak Kanti Das, Youichi Tsuchiya, Chihaya Adachi, Santanu Panda

    Chemical Science   13 ( 33 )   9678 - 9684   2022年7月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    A solvent-dependent access to E vs. Z-allylic amines was achieved via decarboxylative vinylation of amino acids. Detailed experimental studies have been conducted to understand the role of the solvent in the reactivity and stereoselectivity of the vinylation reactions.

    DOI: 10.1039/d2sc02090d

  • Spontaneous formation of metastable orientation with well-organized permanent dipole moment in organic glassy films 査読

    Masaki Tanaka, Morgan Auffray, Hajime Nakanotani, Chihaya Adachi

    Nature Materials   21 ( 7 )   819 - 825   2022年7月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s41563-022-01265-7

  • A Thermally Activated Delayed Fluorescence Green OLED with 4500 h Lifetime and 20&#37; External Quantum Efficiency by Optimizing the Emission Zone using a Single‐Emission Spectrum Technique

    Rossa Mac Ciarnáin, Hin Wai Mo, Kaori Nagayoshi, Hiroshi Fujimoto, Kentaro Harada, Robert Gehlhaar, Tung Huei Ke, Paul Heremans, Chihaya Adachi

    Advanced Materials   34 ( 29 )   2201409 - 2201409   2022年6月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adma.202201409

  • Thermally activated delayed fluorescence poly(dendrimer)s – detrapping excitons for reverse intersystem crossing

    Emma V. Puttock, Chandana Sampath Kumara Ranasinghe, Mohammad Babazadeh, Jos C. M. Kistemaker, Junhyuk Jang, Mile Gao, David M. Huang, Chihaya Adachi, Paul L. Burn, Paul E. Shaw

    Journal of Materials Chemistry C   10 ( 20 )   8109 - 8124   2022年5月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    We compare the effect of donor strength on the optoelectronic properties of thermally activated delayed fluorescence poly(dendrimer)s and their dendrimer analogues.

    DOI: 10.1039/d1tc05151b

  • Efficient Perovskite Light-Emitting Diodes with a Siloxane-Blended Organic Hole Transport Layer 査読

    Toshinori Matsushima, Ryotaro Nasu, Kotaro Takekuma, Tomohiro Ishii, Zhao Feng, Xun Tang, Nozomi Nakamura, Ganbaatar Tumen-Ulzii, Chihaya Adachi

    Advanced Photonics Research   2200003   2022年5月

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    記述言語:英語  

    DOI: 10.1002/adpr.202200003

  • Synthesis, crystal structure, tropicity and charge transport properties of diindenothienothiophene derivatives 査読

    Tanguy Jousselin-Oba, Masashi Mamada, Karen Wright, Jérome Marrot, Chihaya Adachi, Abderrahim Yassar, Michel Frigoli

    Journal of Materials Chemistry C   10   7717 - 7723   2022年4月

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    記述言語:英語  

    DOI: 10.1039/D2TC01324J

  • Significant role of triplet spin state for exciton dissociation in organic solids 査読

    Takahiko Yamanaka, Hajime Nakanotani, Chihaya Adachi

    Science Advances   8 ( 9 )   2022年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Clarification of the role of the spin state that initiates exciton dissociation is critical to attaining a fundamental understanding of the mechanism of organic photovoltaics. Although an excited spin-triplet state with an energy lower than that of excited spin-singlet state is disadvantageous in exciton dissociation, a small electron exchange integral results in small singlet-triplet energy splitting in some material systems. This energy splitting leads to a nearly isoenergetic alignment of both excited states, raising a question about the role of excited spin states in exciton dissociation. Herein, we show that the spin-triplet rather than the spin-singlet plays a critical role in the exciton dissociation that leads to the formation of free carriers. This result indicates that the spin-triplet inherently acts as an intermediate, leading to exciton dissociation. Thus, our demonstration provides a fundamental understanding of the role of excited spin states of organic molecular systems in photoinduced charge-carrier generation.

    DOI: 10.1126/sciadv.abj9188

  • Cibalackrot Dendrimers for Hyperfluorescent Organic Light-Emitting Diodes 査読

    Nicholle R. Wallwork, Masashi Mamada, Angus B. Keto, Sarah K. M. McGregor, Atul Shukla, Chihaya Adachi, Elizabeth Krenske, Ebinazar B. Namdas, Shih-Chun Lo

    Macromolecular Rapid Communications   2200118   2022年3月

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    記述言語:英語  

    DOI: 10.1002/marc.202200118

  • Low Light Amplification Threshold and Reduced Efficiency Roll-Off in Thick Emissive Layer OLEDs from a Diketopyrrolopyrrole Derivative 査読

    Atul Shukla, Volter Entoma, Sarah K. M. McGregor, Monirul Hasan, Masashi Mamada, Evan G. Moore, Chihaya Adachi, Shih-Chun Lo, Ebinazar B. Namdas

    Macromolecular Rapid Communications   2200115   2022年3月

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    記述言語:英語  

    DOI: 10.1002/marc.202200115

  • Numerical Study of Triplet Dynamics in Organic Semiconductors Aimed for the Active Utilization of Triplets by TADF under Continuous-Wave Lasing 査読

    Ayano Abe, Kenichi Goushi, Atula S.D. Sandanayaka, Ryutaro Komatsu, Takashi Fujihara, Masashi Mamada, Chihaya Adachi

    Journal of Physical Chemistry Letters   13 ( 5 )   1323 - 1329   2022年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The limitation of lasing duration less than nanosecond order has been a major problem for realizing organic solid-state continues-wave (CW) lasers and organic semiconductor laser diodes. Triplets accumulation under CW excitation has been well recognized as a critical inhibiting factor. To overcome this issue, the utilization of thermally activated delayed fluorescence (TADF) emitters is a promising mechanism because of efficient reverse intersystem crossing. Herein, we model the triplet accumulation processes under lasing and propose the active utilization of TADF for lasing based on our simulation analysis. We used the rate constants experimentally determined from the optical properties of a boron difluoride curcuminoid fluorophore showing both TADF and lasing. We demonstrate that the intersystem crossing efficiency is gradually increased after the convergence of relaxation oscillation, i.e., terminating laser oscillation. In addition, we found that when the reverse intersystem crossing rate is close to the intersystem crossing rate, CW lasing becomes dominant.

    DOI: 10.1021/acs.jpclett.1c03983

  • Spiroconjugated Tetraaminospirenes as Donors in Color-Tunable Charge-Transfer Emitters with Donor-Acceptor Structure

    Grenz, DC; Rose, D; Wössner, JS; Wilbuer, J; Adler, F; Hermann, M; Chan, CY; Adachi, C; Esser, B

    CHEMISTRY-A EUROPEAN JOURNAL   28 ( 6 )   e202104150   2022年1月   ISSN:0947-6539 eISSN:1521-3765

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    記述言語:英語   出版者・発行元:Chemistry - A European Journal  

    Charge-transfer emitters are attractive due to their color tunability and potentially high photoluminescence quantum yields (PLQYs). We herein present tetraaminospirenes as donor moieties, which, in combination with a variety of acceptors, furnished 12 charge-transfer emitters with a range of emission colors and PLQYs of up to 99 %. The spatial separation of their frontier molecular orbitals was obtained through careful structural design, and two DA structures were confirmed by X-ray crystallography. A range of photophysical measurements supported by DFT calculations shed light on the optoelectronic properties of this new family of spiro-NN-donor-acceptor dyes.

    DOI: 10.1002/chem.202104150

    Web of Science

    Scopus

    PubMed

  • Achieving a Carbon Neutral Future through Advanced Functional Materials and Technologies

    Andrew Chapman, Elif Ertekin, Masanobu Kubota, Akihide Nagao, Kaila Bertsch, Arnaud Macadre, Toshihiro Tsuchiyama, Takuro Masamura, Setsuo Takaki, Ryosuke Komoda, Mohsen Dadfarnia, Brian Somerday, Alexander Tsekov Staykov, Joichi Sugimura, Yoshinori Sawae, Takehiro Morita, Hiroyoshi Tanaka, Kazuyuki Yagi, Vlad Niste, Prabakaran Saravanan, Shugo Onitsuka, Ki-Seok Yoon, Seiji Ogo, Toshinori Matsushima, Ganbaatar Tumen-Ulzii, Dino Klotz, Dinh Hoa Nguyen, George Harrington, Chihaya Adachi, Hiroshige Matsumoto, Leonard Kwati, Yukina Takahashi, Nuttavut Kosem, Tatsumi Ishihara, Miho Yamauchi, Bidyut Baran Saha, Md. Amirul Islam, Jin Miyawaki, Harish Sivasankaran, Masamichi Kohno, Shigenori Fujikawa, Roman Selyanchyn, Takeshi Tsuji, Yukihiro Higashi, Reiner Kirchheim, Petros Sofronis

    Bulletin of the Chemical Society of Japan   95 ( 1 )   73 - 103   2022年1月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/bcsj.20210323

  • Performance Analysis of a Perovskite-Based Thing-to-Thing Optical Wireless Power Transfer System 査読

    Dinh Hoa Nguyen, Ganbaatar Tumen-Ulzii, Toshinori Matsushima, Chihaya Adachi

    IEEE Photonics Journal   14 ( 1 )   2022年1月

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    記述言語:英語  

    DOI: 10.1109/JPHOT.2022.3146365

  • Probing polaron-induced exciton quenching in TADF based organic light-emitting diodes 査読

    Monirul Hasan, Siddhartha Saggar, Atul Shukla, Fatima Bencheikh, Jan Sobus, Sarah K. M. McGregor, Chihaya Adachi, Shih-Chun Lo, Ebinazar B. Namdas

    nature communications   13   254   2022年1月

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    記述言語:英語  

    DOI: 10.1038/s41467-021-27739-x

  • Steric Modulation of Spiro Structure for Highly Efficient Multiple Resonance Emitters 査読

    Yang-Kun Qu, Dong-Ying Zhou, Fan-Cheng Kong, Qi Zheng, Xun Tang, Yuan-Hao Zhu, Chen-Chao Huang, Zi-Qi Feng, Jian Fan, Chihaya Adachi, Liang-Sheng Liao, Zuo-Quan Jiang

    Angewandte Chemie   61 ( 22 )   e202201886   2022年1月

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    記述言語:英語  

    DOI: 10.1002/anie.202201886

  • Analysis of Emission Zone Profile in an Organic–Quantum Dots Hybrid Device

    Mo H.W., Harada K., Adachi C.

    Proceedings of the International Display Workshops   29   452 - 455   2022年   ISSN:18832490

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    出版者・発行元:Proceedings of the International Display Workshops  

    We report first time the emission zone profile, the spatial distribution of the emission intensity along the direction of the applied bias, of a quantum dot light-emitting diode. The emission zone profile is correlated with the balance of n- and p-type currents in a diode, and the device efficiency and its roll-off behavior strongly depend on whether the emission peak is preferably distributed or concentrated at a specific interface. The emission zone profiling can thus provide us with clues for improving the performance of organic–quantum dots hybrid devices.

    Scopus

  • Analyzing the Degradation Process of Quantum-Dot LEDs (QLEDs) by Mass Spectrometryf

    Mo H.W., Shirakura D., Harada K., Ishibashi K., Shibamori T., Miyamoto T., Adachi C.

    Digest of Technical Papers - SID International Symposium   53 ( 1 )   1 - 4   2022年   ISSN:0097966X

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    出版者・発行元:Digest of Technical Papers - SID International Symposium  

    By utilizing time-of-flight secondary ion mass spectrometry (TOF-SIMS), the degradation processes of quantum dot core components and the surface ligands were studied. Intentionally degraded QLED samples were prepared, and the TOF-SIMS mass composition signals of each layer within the QLEDs are estimated. The result of the analysis gives possible structural information of the degraded species induced in the device, providing useful insights for further developments of highly efficientR/G/B quantum dotmaterials.

    DOI: 10.1002/sdtp.15815

    Scopus

  • High-efficiency and stable blue hyperfluorescence organic light-emitting diode

    Chan, CY; Lee, YT; Tsuchiya, Y; Nakanotani, H; Adachi, C

    ORGANIC AND HYBRID LIGHT EMITTING MATERIALS AND DEVICES XXVI   12208   2022年   ISSN:0277-786X ISBN:978-1-5106-5400-6 eISSN:1996-756X

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    出版者・発行元:Proceedings of SPIE - The International Society for Optical Engineering  

    Organic light-emitting diodes (OLEDs) are a promising light-emitting technology useful for various display applications1,2. Despite great progress in this field3-12, there is an ongoing challenge to realize high performance blue OLEDs with efficiency, good color purity, and device lifetime. Here, we report pure-blue (CIEx,y color coordinates of [0.13, 0.16]) OLEDs with high-efficiency (external quantum efficiency of 32 % at 1000 cd m-2), narrow-emission (full width half maximum of 19 nm), and good stability (LT95 of 18 hours at an initial luminance of 1000 cd m-2). The design is based on a two-unit stacked tandem hyperfluorescence (HF)-OLED with an improved singlet-excited energy transfer process from a sky-blue TADF assistant dopant (AD) (HDT-1) to a pure-blue terminal emitter (TE) (v-DABNA). Furthermore, the effect of dopant concentration of terminal emitter on the device performance of hyperfluorescence OLEDs is studied. Device shows a better color purity when dopant concentration is increased. On the other hand, new hyperfluorescence OLEDs have been fabricated, in which device stability has been extended with a new molecular design of TE.

    DOI: 10.1117/12.2632333

    Web of Science

    Scopus

  • Highly efficient pixelated near-infrared OLED light source

    Ichikawa, T; Takagi, A; Yamada, N; Itonaga, K; Nakanotani, H; Adachi, C

    LIGHT-EMITTING DEVICES, MATERIALS, AND APPLICATIONS XXVI   12022   2022年   ISSN:0277-786X ISBN:978-1-5106-4915-6 eISSN:1996-756X

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    出版者・発行元:Proceedings of SPIE - The International Society for Optical Engineering  

    In this study, we developed highly efficient pixelated near-infrared organic light-emitting diodes (NIR-OLEDs) featuring self-emission and small form factor, which are expected to expand applications of light sensing. To realize new NIROLEDs in which active-matrix drive is possible by multiple fine pixels, we established a highly efficient NIR-OLED material and top-emitting NIR-OLEDs with fine pixels. Excellent characteristics including pixel pitch of 7.8 μm, peak wavelength of more than 900 nm, and external quantum efficiency of approximately 1% were successfully demonstrated. In addition, we confirmed the feasibility of highly efficient NIR-OLEDs with fine pixels, which is expected to contribute toward miniaturized sensing light sources with low power consumption, and hence improved value.

    DOI: 10.1117/12.2608387

    Web of Science

    Scopus

  • Improved Performance of Perovskite Solar Cells by Suppressing the Energy-Level Shift of the PEDOT:PSS Hole Transport Layer 査読

    Masayuki Yahiro, Shun Sugawara, Shinichi Maeda, Yuko Shimoi, Pangpang Wang, Shin-ichiro Kobayashi, Kotaro Takekuma, Ganbaatar Tumen-Ulzii, Chuanjiang Qin, Toshinori Matsushima, Tadayuki Isaji, Yoshinori Kasai, Takashi Fujihara, Chihaya Adachi

    ACS Applied Energy Materials   4 ( 12 )   14590 - 14598   2021年12月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsaem.1c03213

  • Advanced Organic Laser System Having Triplet Scavengers 査読

    Buddhika S.B, KARUNATHILAKA, Umamahesh BALIJAPALLI, Toshinori MATSUSHIMA, Atula S.D. SANDANAYAKA, Chihaya ADACHI

    J-STAGE   60 ( 6 )   615 - 630   2021年12月

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    記述言語:英語  

    DOI: 10.11370/isj.60.615

  • High-performance solution-processed red hyperfluorescent OLEDs based on cibalackrot 査読

    Nicholle R. Wallwork, Masashi Mamada, Atul Shukla, Sarah K. M. McGregor, Chihaya Adachi, Ebinazar Namdas, Shih-Chun Lo

    Journal of Materials Chemistry C   10   4767 - 4774   2021年12月

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    記述言語:英語  

    DOI: 10.1039/D1TC04937B

  • Organic photostimulated luminescence associated with persistent spin-correlated radical pairs 査読

    Manabu Sakurai, Ryota Kabe, Masaaki Fuki, Zesen Lin, Kazuya Jinnai, Yasuhiro Kobori, Chihaya Adachi, Takashi Tachikawa

    Communications Materials   2 ( 1 )   2021年12月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Abstract

    Photostimulated luminescence allows energy or data to be stored and released using electromagnetic waves as both the input and output, and has attracted considerable interest in the fields of biomedical and information technologies. However, this phenomenon is mostly limited to solid inorganic materials. Here, we report photostimulated luminescence from purely organic blend films, composed of electron donor, acceptor, and trap/emitter molecules. Charges in the films are accumulated as radical ions by ultraviolet light irradiation and then extracted by near-infrared light irradiation. Even after storage in the dark for one week they produce visible light with good repeatability, color tunability, and are responsive to weak external magnetic fields. These findings might broadly impact existing applications and provide new prospects for innovative flexible devices.

    DOI: 10.1038/s43246-021-00178-3

  • Hot exciplexes in U-shaped TADF molecules with emission from locally excited states 査読

    A. Lennart Schleper, Kenichi Goushi, Christoph Bannwarth, Bastian Haehnle, Philipp J. Welscher, Chihaya Adachi, Alexander J. C. Kuehne

    Nature Communications   12 ( 1 )   2021年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Abstract

    Fast emission and high color purity are essential characteristics of modern opto-electronic devices, such as organic light emitting diodes (OLEDs). These properties are currently not met by the latest generation of thermally activated delayed fluorescence (TADF) emitters. Here, we present an approach, called “hot exciplexes” that enables access to both attributes at the same time. Hot exciplexes are produced by coupling facing donor and acceptor moieties to an anthracene bridge, yielding an exciplex with large T1 to T2 spacing. The hot exciplex model is investigated using optical spectroscopy and quantum chemical simulations. Reverse intersystem crossing is found to occur preferentially from the T3 to the S1 state within only a few nanoseconds. Application and practicality of the model are shown by fabrication of organic light-emitting diodes with up to 32 &#37; hot exciplex contribution and low efficiency roll-off.

    DOI: 10.1038/s41467-021-26439-w

  • Synthesis, Aromaticity, and Application of peri-Pentacenopentacene: Localized Representation of Benzenoid Aromatic Compounds 査読

    Tanguy Jousselin-Oba, Masashi Mamada, Karen Wright, Jérome Marrot, Chihaya Adachi, Abderrahim Yassar, Michel Frigoli

    61 ( 1 )   e202112794   2021年11月

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    記述言語:英語  

    DOI: 10.1002/anie.202112794

  • 2,6-Dicarbonitrile Diphenyl-1 lambda(5)-Phosphinine (DCNP)-A Robust Conjugated Building Block for Multi-Functional Dyes Exhibiting Tunable Amplified Spontaneous Emission 査読

    Umamahesh Balijapalli, Xun Tang, Daichi Okada, Yi-Ting Lee, Buddhika S. B. Karunathilaka, Morgan Auffray, Ganbaatar Tumen-Ulzii, Youichi Tsuchiya, Atula S. D. Sandanayaka, Toshinori Matsushima, Hajime Nakanotani, Chihaya Adachi

    ADVANCED OPTICAL MATERIALS   9 ( 21 )   2021年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Highly efficient organic light-emitting diodes (OLEDs) with the concurrent achievement of high external electroluminescence quantum efficiency (EQE) and low light amplification thresholds under optical excitation have been considered as a crucial evolution towards the development of high-performance electrically pumped organic semiconductor laser diodes. Herein, a series of 2,6-dicarbonitrile-diphenyl-1 lambda(5)-phosphinine (DCNP) based donor (D)-acceptor (A) type dyes with different electron-withdrawing and donating moieties have been designed and characterized. The well-manipulated D-A strength with tunable optical properties guaranteed the low amplified spontaneous emission (ASE) thresholds of below 10 mu J cm(-2) and furnished a wide-range color-tuning capability in the visible region (485-595 nm). Furthermore, employing a thermally-activated delayed fluorescence (TADF) molecule as a triplet harvester boosted the performance of OLEDs based on mDMCz that exhibits an exceptional EQE value of 18.4&#37; which is an eightfold enhancement as compared with that of standard fluorescence OLEDs. Also, the TADF-assistant fluorescence (TAF) system enables a reduction of the ASE threshold to 3 mu J cm(-2) and excellent ASE stability. These results provide a rational design strategy to construct color-tunable lasing dyes with reduced ASE thresholds and clarify their potentiality as the fluorescent dopant in the TAF system to utilize up-converted triplet excitons via efficient energy transfer.

    DOI: 10.1002/adom.202101122

  • Efficiency of Thermally Activated Delayed Fluorescence Sensitized Triplet Upconversion Doubled in Three-Component System 査読

    Brett Yurash, Alana Dixon, Carolina Espinoza, Alexander Mikhailovsky, Sangmin Chae, Hajime Nakanotani, Chihaya Adachi, Thuc-Quyen Nguyen

    Advanced Materials   34 ( 5 )   2103976   2021年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    As in many fields, the most exciting endeavors in photon upconversion research focus on increasing the efficiency (upconversion quantum yield) and performance (anti-Stokes shift) while diminishing the cost of production. In this vein, studies employing metal-free thermally activated delayed fluorescence (TADF) sensitizers have garnered increased interest. Here, for the first time, the strategy of ternary photon upconversion is utilized with the TADF sensitizer 2,4,5,6-tetrakis(carbazol-9-yl)isophthalonitrile (4CzIPN), resulting in a doubling of the upconversion quantum yield in comparison to the binary system employing p-terphenyl as the emitter. In this ternary blend, the sensitizer 4CzIPN is paired with an intermediate acceptor, 1-methylnaphthalene, in addition to the emitter molecule, p-terphenyl, yielding a normalized upconversion quantum yield of 7.6&#37; while maintaining the 0.83 eV anti-Stokes shift. These results illustrate the potential benefits of utilizing this strategy of energy-funneling, previously used only with heavy-metal based sensitizers, to increase the performance of these photon upconversion systems.

    DOI: 10.1002/adma.202103976

  • Low-Threshold Exciton-Polariton Condensation via Fast Polariton Relaxation in Organic Microcavities 査読

    Tomohiro Ishii, Kiyoshi Miyata, Masashi Mamada, Fatima Bencheikh, Fabrice Mathevet, Ken Onda, Stéphane Kéna-Cohen, Chihaya Adachi

    Advanced Optical Materials   10 ( 3 )   2102034   2021年11月

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    記述言語:英語  

    DOI: 10.1002/adom.202102034

  • Managing Intersegmental Charge-Transfer and Multiple Resonance Alignments of D3-A Typed TADF Emitters for Red OLEDs with Improved Efficiency and Color Purity 査読

    Xiao-Chun Fan, Kai Wang, Yi-Zhong Shi, Jia-Xiong Chen, Feng Huang, Hui Wang, Ya-Nan Hu, Youichi Tsuchiya, Xue-Mei Ou, Jia Yu, Chihaya Adachi, Xiao-Hong Zhang

    Advanced Optical Materials   10 ( 3 )   2101789   2021年11月

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    記述言語:英語  

    DOI: 10.1002/adom.202101789

  • Organic long-persistent luminescence stimulated by visible light in p-type systems based on organic photoredox catalyst dopants. 査読 国際誌

    Kazuya Jinnai, Ryota Kabe, Zesen Lin, Chihaya Adachi

    Nature materials   21   338 - 344   2021年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic long-persistent-luminescent (OLPL) materials demonstrating hour-long photoluminescence have practical advantages in applications owing to their flexible design and easy processability. However, the energy absorbed in these materials is typically stored in an intermediate charge-separated state that is unstable when exposed to oxygen, thus preventing persistent luminescence in air unless oxygen penetration is suppressed through crystallization. Moreover, OLPL materials usually require ultraviolet excitation. Here we overcome such limitations and demonstrate amorphous OLPL systems that can be excited by radiation up to 600 nm and exhibit persistent luminescence in air. By adding cationic photoredox catalysts as electron-accepting dopants in a neutral electron-donor host, stable charge-separated states are generated by hole diffusion in these blends. Furthermore, the addition of hole-trapping molecules extends the photoluminescence lifetime. By using a p-type host less reactive to oxygen and tuning the donor-acceptor energy gap, our amorphous blends exhibit persistent luminescence stimulated by visible light even in air, expanding the applicability of OLPL materials.

    DOI: 10.1038/s41563-021-01150-9

  • Recycling of Triplets into Singlets for High-Performance Organic Lasers 査読

    Chathuranganie A. M. Senevirathne, Seiya Yoshida, Morgan Auffray, Masayuki Yahiro, Buddhika S. B. Karunathilaka, Fatima Bencheikh, Kenichi Goushi, Atula S. D. Sandanayaka, Toshinori Matsushima, Chihaya Adachi

    ADVANCED OPTICAL MATERIALS   2021年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Achieving continuous-wave (CW) lasing in organic semiconductors is known to be a difficult task because long-lived triplets quench radiative singlets via singlet-triplet annihilation (STA). To avoid STA and operate organic lasers in CW or long-pulse photoexcitation, the triplets need to be removed from an organic laser gain medium. However, this triplet removal leads to a loss of excitons. In addition to removing the detrimental triplets, here it is reported a triplet recycling process, which includes triplet scavenging and successive triplet upconversion via triplet-triplet annihilation (TTA) to regenerate emissive singlet excitons in a laser medium. An anthracene derivative of 9-(1-naphthalenyl)-10-(4-(2-naphthalenyl)phenyl)anthracene (NaNaP-A) and a laser dye of 4,4 '-bis[4-(diphenylamino)styryl]biphenyl (BDAVBi) are used as the triplet recycling sensitizer and the emitting laser dye, respectively. In this laser system, NaNaP-A can efficiently scavenge the triplets formed on BDAVBi because the triplet level is deeper for NaNaP-A than for BDAVBi, and then NaNaP-A successively recycles the triplets into the BDAVBi's singlet state via TTA. The TTA compensates and overcomes the STA in this laser system. Hence, these laser devices can be operated with long pulse widths of up to 10 ms. This unique triplet recycling behavior is confirmed by transient photoluminescence (PL) and electroluminescence (EL) studies.

    DOI: 10.1002/adom.202101302

  • Exact Solution of Kinetic Analysis for Thermally Activated Delayed Fluorescence Materials 査読

    Youichi Tsuchiya, Stefan Diesing, Fatima Bencheikh, Yoshimasa Wada, Paloma L. dos Santos, Hironori Kaji, Eli Zysman-Colman, Ifor D. W. Samuel, Chihaya Adachi

    The Journal of Physical Chemistry A   125 ( 36 )   8074 - 8089   2021年9月

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    記述言語:その他  

    DOI: 10.1021/acs.jpca.1c04056

  • Characterizing the Conformational Distribution in an Amorphous Film of an Organic Emitter and Its Application in a “Self-Doping” Organic Light-Emitting Diode 査読

    Yi-Zhong Shi, Kai Wang, Shao-Li Zhang, Xiao-Chun Fan, Youichi Tsuchiya, Yi-Ting Lee, Gao-Le Dai, Jia-Xiong Chen, Cai-Jun Zheng, Shi-Yun Xiong, Xue-Mei Ou, Jia Yu, Jian-Sheng Jie, Chun-Sing Lee, Chihaya Adachi, Xiao-Hong Zhang

    Angewandte Chemie International Edition   60 ( 49 )   25878 - 25883   2021年9月

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    記述言語:英語  

    DOI: 10.1002/anie.202108943

  • Enhanced Light–Matter Interaction and Polariton Relaxation by the Control of Molecular Orientation 査読

    Tomohiro Ishii, Fatima Bencheikh, Sébastien Forget, Sébastien Chénais, Benoît Heinrich, David Kreher, Lydia Sosa Vargas, Kiyoshi Miyata, Ken Onda, Takashi Fujihara, Stéphane Kéna‐Cohen, Fabrice Mathevet, Chihaya Adachi

    Advanced Optical Materials   2101048 - 2101048   2021年9月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adom.202101048

  • Electron‐Affinity Substituent in 2,6‐Dicarbonitrile Diphenyl‐1λ 5 ‐Phosphinine (DCNP) Towards High‐Quality Organic Lasing and Electroluminescence under High Current Injection

    Xun Tang, Umamahesh Balijapalli, Daichi Okada, Buddhika S. B. Karunathilaka, Chathuranganie A. M. Senevirathne, Yi‐Ting Lee, Zhao Feng, Atula S. D. Sandanayaka, Toshinori Matsushima, Chihaya Adachi

    Advanced Functional Materials   2104529 - 2104529   2021年8月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adfm.202104529

  • Visualization of Frontier Molecular Orbital Separation of a Single Thermally Activated Delayed Fluorescence Emitter by STM

    Inhae Zoh, Miyabi Imai-Imada, Jaehyun Bae, Hiroshi Imada, Youichi Tsuchiya, Chihaya Adachi, Yousoo Kim

    The Journal of Physical Chemistry Letters   12 ( 31 )   7512 - 7518   2021年8月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.jpclett.1c02140

  • An Element‐Substituted Cyclobutadiene Exhibiting High‐Energy Blue Phosphorescence

    Yoshiaki Shoji, Yasuhiro Ikabata, Ivan Ryzhii, Rabia Ayub, Ouissam El Bakouri, Taiga Sato, Qi Wang, Tomoaki Miura, Buddhika S. B. Karunathilaka, Youichi Tsuchiya, Chihaya Adachi, Henrik Ottosson, Hiromi Nakai, Tadaaki Ikoma, Takanori Fukushima

    Angewandte Chemie   2021年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/ange.202108413

  • Developing Efficient Dinuclear Pt(II) Complexes Based on the Triphenylamine Core for High-Efficiency Solution-Processed OLEDs 査読

    Yuanhui Sun, Bochen Liu, Yue Guo, Xi Chen, Yi-Ting Lee, Zhao Feng, Chihaya Adachi, Guijiang Zhou, Zhao Chen, Xiaolong Yang

    ACS Appl. Mater. Interfaces   13 ( 30 )   36020 - 36032   2021年7月

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    記述言語:英語  

    DOI: 10.1021/acsami.1c06148

  • Advanced Molecular Design for Organic Light Emitting Diode Emitters Based on Horizontal Molecular Orientation and Thermally Activated Delayed Fluorescence

    Li Zhao, DaeHyeon Kim, Jean‐Charles Ribierre, Takeshi Komino, Chihaya Adachi

    Organic Semiconductors for Optoelectronics   295 - 305   2021年7月

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    記述言語:その他  

    DOI: 10.1002/9781119146131.ch12

  • Tetrabenzo[a,c]phenazine Backbone for Highly Efficient Orange–Red Thermally Activated Delayed Fluorescence with Completely Horizontal Molecular Orientation 査読

    Umamahesh Balijapalli, Yi-Ting Lee, Buddhika S, B. Karunathilaka, Ganbaatar Tumen-Ulzii, Morgan Auffray, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi

    Angewandte Chemie International Edition   60 ( 35 )   19364 - 19373   2021年6月

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    記述言語:その他  

    DOI: 10.1002/anie.202106570

  • Active Control of Spontaneous Orientation Polarization of Tris(8‐hydroxyquinolinato)aluminum (Alq 3 ) Films and Its Effect on Performance of Organic Light‐Emitting Diodes

    Yu Esaki, Masaki Tanaka, Toshinori Matsushima, Chihaya Adachi

    Advanced Electronic Materials   2100486 - 2100486   2021年6月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/aelm.202100486

  • An Element‐Substituted Cyclobutadiene Exhibiting High‐Energy Blue Phosphorescence

    Yoshiaki Shoji, Yasuhiro Ikabata, Ivan Rhyzhii, Rabia Ayub, Ouissam El Bakouri, Taiga Sato, Qi Wang, Tomoaki Miura, Buddhika S. B. Karunathilaka, Youichi Tsuchiya, Chihaya Adachi, Henrik Ottosson, Hiromi Nakai, Tadaaki Ikoma, Takanori Fukushima

    Angewandte Chemie International Edition   60 ( 40 )   21817 - 21823   2021年6月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/anie.202106490

  • Toward Thing-to-Thing Optical Wireless Power Transfer: Metal Halide Perovskite Transceiver as an Enabler

    Dinh Hoa Nguyen, Toshinori Matsushima, Chuanjiang Qin, Chihaya Adachi

    Frontiers in Energy Research   9   2021年6月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    This paper proposes a novel conceptual system of optical wireless power transfer (OWPT) between objects, which is different from the existing OWPT systems such that a single device—an optical transceiver—is employed. This optical transceiver, which is capable of both absorbing and emitting light, is fabricated from a metal halide perovskite known for its superior features that can help significantly reduce the whole system size and cost. The proposed system contributes to realizing a thing-to-thing OWPT network, in which surfaces of objects/things are covered by perovskite transceivers (fully or partially), enabling them to wirelessly charge or discharge from the others.

    DOI: 10.3389/fenrg.2021.679125

  • Unintentional passivation of 4-tertbutyl pyridine for improved efficiency and decreased operational stability of perovskite solar cells

    Ganbaatar Tumen-Ulzii, Morgan Auffray, Toshinori Matsushima, Chihaya Adachi

    Applied Physics Letters   118 ( 24 )   241603 - 241603   2021年6月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/5.0051527

  • Direct Observation of Photoexcited Electron Dynamics in Organic Solids Exhibiting Thermally Activated Delayed Fluorescence via Time-Resolved Photoelectron Emission Microscopy 査読

    Yusuke Fukami, Masato Iwasawa, Masahiro Sasaki, Takuya Hosokai, Hajime Nakanotani, Chihaya Adachi, Keiki Fukumoto, Yoichi Yamada

    Advanced Optical Materials   9 ( 19 )   2100619   2021年6月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Solid-state films exhibiting thermally activated delayed fluorescence (TADF) can offer high internal electroluminescence (EL) quantum efficiency, even in a simplified device structure. However, the exciton dynamics in solid-state TADF films, particularly for the unexpected exciton loss processes such as concentration quenching, have not yet been clarified. The dynamics of photoexcited electrons in the TADF process of a 2,4,5,6-Tetra (9H-carbazol-9-yl) isophthalonitrile (4CzIPN) solid film are observed via time-resolved photoelectron emission microscopy (TR-PEEM) and the results are compared with the conventional time-resolved photoluminescence (TR-PL) technique. The initial decay process of the photoexcited electrons probed via TR-PEEM is thoroughly traced in the TR-PL signal, while unusual long-lived electrons are detected only through the use of TR-PEEM. These results indicate that the excitons of 4CzIPN spontaneously dissociate into free carriers within the exciton lifetime, which seems to be a common process that contributes to the exciton loss in polar organic solids.

    DOI: 10.1002/adom.202100619

  • Long-Persistent Luminescence from an Exciplex-Based Organic Light-Emitting Diode 査読

    Shinichi Tan, Kazuya Jinnai, Ryota Kabe, Chihaya Adachi

    ADVANCED MATERIALS   33 ( 23 )   2021年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic long-persistent luminescent systems (OLPLs) exhibiting long-lasting emission after photoexcitation consist of organic electron donors and acceptors, that are widely used in organic light-emitting diodes (OLEDs). Although OLPLs and OLEDs include very similar excitonic processes, long-lasting emission has never been observed in OLEDs. This study confirms the presence of long-persistent luminescence (LPL) under electrical excitation.

    DOI: 10.1002/adma.202008844

  • Thermally activated processes in an organic long-persistent luminescence system 査読

    Kazuya Jinnai, Naohiro Nishimura, Chihaya Adachi, Ryota Kabe

    NANOSCALE   13 ( 18 )   8412 - 8417   2021年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Glow-in-the-dark materials can store absorbed photon energy and emit light for long periods of time. While inorganic long-persistent luminescence (LPL) materials are crystalline and often require rare metals, organic LPL (OLPL) materials are flexible and require no rare metals. The emission process of OLPL systems consists of photoinduced charge separation, charge accumulation, and emission from charge recombination. Although emission processes of OLPL systems have been investigated, the charge separation and accumulation processes remain enigmatic. In this study, we investigated the charge carrier dynamics of a binary OLPL system comprising of electron donors and acceptors. We confirmed the presence of thermal activation processes, thermally activated delayed fluorescence and thermoluminescence in the OLPL system.

    DOI: 10.1039/d0nr09227d

  • Highly Efficient Near‐Infrared Electrofluorescence from a Thermally Activated Delayed Fluorescence Molecule

    Umamahesh Balijapalli, Ryo Nagata, Nishiki Yamada, Hajime Nakanotani, Masaki Tanaka, Anthony D'Aléo, Virginie Placide, Masashi Mamada, Youichi Tsuchiya, Chihaya Adachi

    Angewandte Chemie   133 ( 15 )   8558 - 8563   2021年4月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/ange.202016089

  • Amplified spontaneous emission from oligo(p-phenylenevinylene) derivatives 査読

    Masashi Mamada, Hajime Nakanotani, Chihaya Adachi

    Materials Advances   2   3906 - 3914   2021年4月

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    記述言語:その他  

    DOI: 10.1039/D0MA00756K

  • Heptacene: Synthesis and Its Hole-Transfer Property in Stable Thin Films

    Takaaki Miyazaki, Motonori Watanabe, Toshinori Matsushima, Ching-Ting Chien, Chihaya Adachi, Shih-Sheng Sun, Hiroyuki Furuta, Tahsin J. Chow

    Chemistry – A European Journal   2021年4月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/chem.202100936

  • Synthesis and Characterization of 5,5′-Bitetracene 査読

    Masashi Mamada, Kenichi Goushi, Ryota Nakamura, Hironori Kaji, Chihaya Adachi

    Chemistry Letters   50 ( 4 )   800 - 803   2021年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A tetracene dimer, 5,5'-bitetracene (55BT), has successfully been synthesized for the first time and its structure was confirmed by X-ray single crystal analysis. The electrochemical and optical properties of 55BT were investigated and compared to those of tetracene. Although the photoluminescence quantum yield of 55BT was slightly higher than that of tetracene, the results of the transient absorption spectroscopy suggested triplet formation by singlet fission in solution.

    DOI: 10.1246/cl.200909

  • Highly Efficient Near‐Infrared Electrofluorescence from a Thermally Activated Delayed Fluorescence Molecule 査読

    Umamahesh Balijapalli, Ryo Nagata, Nishiki Yamada, Hajime Nakanotani, Masaki Tanaka, Anthony D'Aléo, Virginie Placide, Masashi Mamada, Youichi Tsuchiya, Chihaya Adachi

    Angewandte Chemie International Edition   60 ( 15 )   8477 - 8482   2021年4月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/anie.202016089

  • Intramolecular‐Locked High Efficiency Ultrapure Violet‐Blue (CIE‐y <0.046) Thermally Activated Delayed Fluorescence Emitters Exhibiting Amplified Spontaneous Emission 査読

    Aziz Khan, Xun Tang, Cheng Zhong, Qiang Wang, Sheng‐Yi Yang, Fan‐Cheng Kong, Shuai Yuan, Atula S. D. Sandanayaka, Chihaya Adachi, Zuo‐Quan Jiang, Liang‐Sheng Liao

    Advanced Functional Materials   31 ( 15 )   2009488 - 2009488   2021年4月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adfm.202009488

  • Investigating HOMO Energy Levels of Terminal Emitters for Realizing High‐Brightness and Stable TADF‐Assisted Fluorescence Organic Light‐Emitting Diodes 査読

    Yi‐Ting Lee, Chin‐Yiu Chan, Masaki Tanaka, Masashi Mamada, Umamahesh Balijapalli, Youichi Tsuchiya, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi

    Advanced Electronic Materials   7 ( 4 )   2001090 - 2001090   2021年4月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/aelm.202001090

  • Isotope Effect of Host Material on Device Stability of Thermally Activated Delayed Fluorescence Organic Light‐Emitting Diodes 査読

    Xuelong Liu, Chin-Yiu Chan, Fabrice Mathevet, Masashi Mamada, Youichi Tsuchiya, Yi-Ting Lee, Hajime Nakanotani, Shinichiro Kobayashi, Masayuki Shiochi, Chihaya Adachi

    Small Science   1 ( 4 )   2000057 - 2000057   2021年4月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/smsc.202000057

  • Photoactive Organic/Inorganic Hybrid Materials with Nanosegregated Donor–Acceptor Arrays 査読

    Xiaolei Zhu, Cheriehan Hessin, Aude Salamé, Lydia Sosa‐Vargas, David Kreher, Chihaya Adachi, Anna Proust, Pierre Mialane, Jérome Marrot, Aude Bouchet, Michel Sliwa, Stéphane Méry, Benoît Heinrich, Fabrice Mathevet, Guillaume Izzet

    Angewandte Chemie International Edition   60 ( 15 )   8419 - 8424   2021年4月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/anie.202014319

  • Energy transfer in (PEA)2FAn−1PbnBr3n+1 quasi-2D perovskites

    Džiugas Litvinas, Ramūnas Aleksiejūnas, Patrik Ščajev, Paulius Baronas, Vaiva Soriūtė, Chuanjiang Qin, Takashi Fujihara, Toshinori Matsushima, Chihaya Adachi, Saulius Juršėnas

    Journal of Materials Chemistry C   9 ( 14 )   4782 - 4791   2021年3月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    <p>Simultaneous fast energy funnelling between the neighbouring sheets and slower carrier and exciton in-plane diffusion revealed in quasi-2D perovskites.</p>

    DOI: 10.1039/d1tc00422k

  • Thermally Activated Delayed Fluorescence Properties of Trioxoazatriangulene Derivatives Modified with Electron Donating Groups 査読

    Youichi Tsuchiya, Yuma Ishikawa, Sang‐Hoon Lee, Xian‐Kai Chen, Jean‐Luc Brédas, Hajime Nakanotani, Chihaya Adachi

    Advanced Optical Materials   9 ( 14 )   2002174 - 2002174   2021年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    With the aim of achieving high-performance thermally activated delayed fluorescence, a series of trioxoazatriangulene derivatives are systematically developed by modifying the donor substituents. The emission colors are shifted from green to greenish-yellow and to yellow with rather broad spectral widths of 70-95 nm by introducing carbazole, triphenylamine, or diphenylamine donor units, indicating that each emission originates from a charge-transfer transition. On the other hand, the trioxoazatriangulene modified with three diphenylamines shows orange emission with a narrow emission spectrum (45 nm), suggesting that the transition mainly originates from a multiple resonance effect.

    DOI: 10.1002/adom.202002174

  • An Electron‐Accepting aza‐BODIPY‐Based Donor–Acceptor–Donor Architecture for Bright NIR Emission 査読

    Yuto Kage, Seongsoo Kang, Shigeki Mori, Masashi Mamada, Chihaya Adachi, Dongho Kim, Hiroyuki Furuta, Soji Shimizu

    Chemistry – A European Journal   27 ( 16 )   5259 - 5267   2021年3月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    A bright near-infrared (NIR) fluorescent molecule was developed based on the donor–acceptor–donor (D–A–D) approach using an aza-BODIPY analog called pyrrolopyrrole aza-BODIPY (PPAB) as an electron-accepting chromophore. Directly introducing electron-donating triphenylamine (TPA) to develop a D–A–D structure caused redshifts of absorption and emission of PPAB into the NIR region with an enhanced fluorescence brightness of up to 5.2×104 m−1 cm−1, whereas inserting a phenylene linker between the TPA donor and the PPAB acceptor induced solvatochromic behavior in emission. Transient absorption spectra and theoretical calculations revealed the presence of a highly emissive hybridized locally excited and charge-transfer state in the former case and the contribution of the dark charge-separated state to the excited state in the latter case. The bright D–A–D PPAB as a novel emitter resulted in a NIR electroluminescence with a high external quantum efficiency of 3.7 &#37; and a low amplified spontaneous emission threshold of ca. 80 μJ cm−2, indicating the high potential for NIR optoelectronic applications.

    DOI: 10.1002/chem.202005360

  • Markedly Improved Performance of Optically Pumped Organic Lasers with Two-Dimensional Distributed-Feedback Gratings 査読

    Chathuranganie A. M. Senevirathne, Atula S. D. Sandanayaka, Buddhika S. B. Karunathilaka, Takashi Fujihara, Fatima Bencheikh, Chuanjiang Qin, Kenichi Goushi, Toshinori Matsushima, Chihaya Adachi

    ACS Photonics   8 ( 5 )   1324 - 1334   2021年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Continuous-wave (CW) lasing is still difficult to realize in organic laser dyes, one reason being the thermal degradation caused by intense photoexcitation. A decrease in laser threshold suppresses the thermal degradation and, therefore, leads to long-lasting lasing from organic laser dyes. Here, we show that it is possible to decrease the laser thresholds by combining the organic laser dye 4,4-bis[(N-carbazole)styryl]biphenyl, which has a small spectral overlap between the laser emission and the excited-state triplet absorption, with two-dimensional (2D) distributed-feedback (DFB) gratings. We used second-order 2D cross double and square lattice DFB gratings, which offer light feedback in two orthogonal directions, and second-order and mixed-order circular DFB gratings, which offer light feedback in radial directions. Among these grating structures, the mixed-order circular DFB grating structure led to the lowest lasing threshold of similar to 0.015 mu J cm(-2) under short-pulse photoexcitation because of the excellent optical feedback. Moreover, a low average-power threshold of 10 W cm(-2) (a peak-power threshold of 1 kW cm-2) was obtained when laser devices with this grating structure were operated under 1 s of long-pulse photoexcitation with a repetition rate of 0.01 Hz. Additionally, using the mixed-order circular DFB grating structure improved the laser stability under CW photoexcitation since shorter exciton lifetimes in the optical resonator suppress the chemical decomposition. These results demonstrate the importance of choosing an optical resonator structure for improving organic laser performance.

    DOI: 10.1021/acsphotonics.0c01728

  • Planar and Rigid Pyrazine‐Based TADF Emitter for Deep Blue Bright Organic Light‐Emitting Diodes 査読

    Pachaiyappan Rajamalli, Dongyang Chen, Subeesh Madayanad Suresh, Youichi Tsuchiya, Chihaya Adachi, Eli Zysman‐Colman

    European Journal of Organic Chemistry   2021年3月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/ejoc.202100086

  • Realizing Near‐Infrared Laser Dyes through a Shift in Excited‐State Absorption 査読

    Reiko Aoki, Ryutaro Komatsu, Kenichi Goushi, Masashi Mamada, Soo Young Ko, Jeong Weon Wu, Virginie Placide, Anthony D'Aléo, Chihaya Adachi

    Advanced Optical Materials   9 ( 6 )   2001947 - 2001947   2021年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The development of near-infrared (NIR) light sources has attracted much interest due to their attractive applications, such as biosensing and light detection and ranging (LiDAR). In particular, organic semiconductor laser diodes with NIR emission are emerging as a next generation technology. However, organic NIR emitters have generally suffered from a low quantum yield, which has resulted in only a few examples of organic solid-state NIR lasers. In this study, the authors demonstrate a highly efficient NIR emitter based on a boron difluoride curcuminoid structure, which shows a high photoluminescence (PL) quantum yield (phi(PL)) at >700 nm and a high fluorescence radiative rate constant in a solid-state film. Amplified spontaneous emission and lasing occurs at >800 nm with very low thresholds. The large redshift of the stimulated emission is attributed to the transition from the lowest excited state to the different vibrational levels of the ground state owing to the overlap between the emission and the singlet-singlet excited-state absorption.

    DOI: 10.1002/adom.202001947

  • Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission 査読

    Chin-Yiu Chan, Masaki Tanaka, Yi-Ting Lee, Yiu-Wing Wong, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi

    Nature Photonics   15 ( 3 )   203 - 207   2021年3月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s41566-020-00745-z

  • Advantages of naphthalene as a building block for organic solid state laser dyes: smaller energy gaps and enhanced stability

    Yuya Oyama, Masashi Mamada, Akihiro Kondo, Chihaya Adachi

    Journal of Materials Chemistry C   9 ( 12 )   4112 - 4118   2021年2月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    <p>The introduction of naphthalene units into a stilbene structure improves not only the PL quantum yield but also stability. The emission wavelength is redshifted upon π-extension, resulting in the realization of excellent green laser dyes.</p>

    DOI: 10.1039/d0tc05387b

  • Deep Blue Fluorescent Material with an Extremely High Ratio of Horizontal Orientation to Enhance Light Outcoupling Efficiency (44&#37;) and External Quantum Efficiency in Doped and Non-Doped Organic Light-Emitting Diodes 査読

    Jian Haur Lee, Hung-Yi Lin, Chia-Hsun Chen, Yi-Ting Lee, Tien-Lung Chiu, Jiun-Haw Lee, Chin-Ti Chen, Chihaya Adachi

    ACS Appl. Mater. Interfaces   13 ( 29 )   34605 - 34615   2021年1月

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    記述言語:英語  

    DOI: 10.1021/acsami.1c07859

  • Synthesis, crystal structure and charge transport characteristics of stable peri-tetracene analogues

    Masashi Mamada, Ryota Nakamura, Chihaya Adachi

    Chemical Science   12 ( 2 )   552 - 558   2021年1月

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    <p>Highly stable <italic>peri</italic>-tetracene analogues with a high degree of singlet biradical character were synthesized in a very simple route, and their crystal structures and semiconducting properties were investigated.</p>

    DOI: 10.1039/d0sc04699j

  • Thermally-activated delayed fluorescence for light-emitting devices 査読

    Hajime Nakanotani, Youichi Tsuchiya, Chihaya Adachi

    Chemistry Letters   2021年1月

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    DOI: 10.1246/cl.200915

  • Suppression of external quantum efficiency rolloff in organic light emitting diodes by scavenging triplet excitons 査読

    Buddhika S. B. Karunathilaka, Umamahesh Balijapalli, Chathuranganie A. M. Senevirathne, Seiya Yoshida, Yu Esaki, Kenichi Goushi, Toshinori Matsushima, Atula S. D. Sandanayaka, Chihaya Adachi

    Nature Communications   11 ( 1 )   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    <title>Abstract</title>
    Large external quantum efficiency rolloff at high current densities in organic light-emitting diodes (OLEDs) is frequently caused by the quenching of radiative singlet excitons by long-lived triplet excitons [singlet–triplet annihilation (STA)]. In this study, we adopted a triplet scavenging strategy to overcome the aforementioned STA issue. To construct a model system for the triplet scavenging, we selected 2,6-dicyano-1,1-diphenyl-λ5σ4-phosphinine (DCNP) as the emitter and 4,4′-bis[(<italic>N</italic>-carbazole)styryl]biphenyl (BSBCz) as the host material by considering their singlet and triplet energy levels. In this system, the DCNP’s triplets are effectively scavenged by BSBCz while the DCNP’s singlets are intact, resulting in the suppressed STA under electrical excitation. Therefore, OLEDs with a 1 wt.&#37;-DCNP-doped BSBCz emitting layer demonstrated the greatly suppressed efficiency rolloff even at higher current densities. This finding favourably provides the advanced light-emitting performance for OLEDs and organic semiconductor laser diodes from the aspect of the suppressed efficiency rolloff.

    DOI: 10.1038/s41467-020-18292-0

  • Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence 査読

    Zesen Lin, Ryota Kabe, Kai Wang, Chihaya Adachi

    Nature Communications   2020年12月

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    DOI: 10.1038/s41467-019-14035-y

  • Color-Tunable Low-Threshold Amplified Spontaneous Emission from Yellow to Near-Infrared (NIR) Based on Donor–Spacer–Acceptor–Spacer–Donor Linear Dyes 査読

    Xun Tang, Yi-Ting Lee, Zhao Feng, Soo Young Ko, Jeong Weon Wu, Virginie Placide, Jean-Charles Ribierre, Anthony D’Aléo, Chihaya Adachi

    ACS Materials Letters   2 ( 12 )   1567 - 1574   2020年12月

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    DOI: 10.1021/acsmaterialslett.0c00421

  • Origin and Suppression of External Quantum Efficiency Roll-Off in Quasi-Two-Dimensional Metal Halide Perovskite Light-Emitting Diodes 査読

    Satoru Watanabe, Ganbaatar Tumen-Ulzii, Tai Cheng, Toshinori Matsushima, Chihaya Adachi

    The Journal of Physical Chemistry C   124 ( 50 )   27422 - 27428   2020年12月

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    DOI: 10.1021/acs.jpcc.0c09241

  • Solid cyclooctatetraene-based triplet quencher demonstrating excellent suppression of singlet–triplet annihilation in optical and electrical excitation 査読

    Van T. N. Mai, Viqar Ahmad, Masashi Mamada, Toshiya Fukunaga, Atul Shukla, Jan Sobus, Gowri Krishnan, Evan G. Moore, Gunther G. Andersson, Chihaya Adachi, Ebinazar B. Namdas, Shih-Chun Lo

    Nature Communications   11 ( 1 )   2020年12月

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    <title>Abstract</title>
    Triplet excitons have been identified as the major obstacle to the realisation of organic laser diodes, as accumulation of triplet excitons leads to significant losses under continuous wave (CW) operation and/or electrical excitation. Here, we report the design and synthesis of a solid-state organic triplet quencher, as well as in-depth studies of its dispersion into a solution processable bis-stilbene-based laser dye. By blending the laser dye with 20 wt&#37; of the quencher, negligible effects on the ASE thresholds, but a complete suppression of singlet–triplet annihilation (STA) and a 20-fold increase in excited-state photostability of the laser dye under CW excitation, were achieved. We used small-area OLEDs (0.2 mm2) to demonstrate efficient STA suppression by the quencher in the nanosecond range, supported by simulations to provide insights into the observed STA quenching under electrical excitation. The results demonstrate excellent triplet quenching ability under both optical and electrical excitations in the nanosecond range, coupled with excellent solution processability.

    DOI: 10.1038/s41467-020-19443-z

  • Solution-Processed Dendrimer-Based TADF Materials for Deep-Red OLEDs 査読

    Emma V. Puttock, Chandana Sampath Kumara Ranasinghe, Mohammad Babazadeh, Junhyuk Jang, David M. Huang, Youichi Tsuchiya, Chihaya Adachi, Paul L. Burn, Paul E. Shaw

    Macromolecules   53 ( 23 )   10375 - 10385   2020年12月

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    DOI: 10.1021/acs.macromol.0c02235

  • Correlated Triplet Pair Formation Activated by Geometry Relaxation in Directly Linked Tetracene Dimer (5,5′-Bitetracene) 査読

    Katsuyuki Shizu, Chihaya Adachi, Hironori Kaji

    ACS Omega   6 ( 4 )   2638 - 2643   2020年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsomega.0c04809

  • Modulating the ground state, stability and charge transport in OFETs of biradicaloid hexahydro-diindenopyrene derivatives and a proposed method to estimate the biradical character 国際誌

    Tanguy Jousselin-Oba, Masashi Mamada, Atsushi Okazawa, Jérome Marrot, Takayuki Ishida, Chihaya Adachi, Abderrahim Yassar, Michel Frigoli

    Chemical Science   11 ( 44 )   12194 - 12205   2020年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    <p>Biradicaloid HDIP derivatives show that the Δ<italic>E</italic>S–T gap does not follow the reverse trend of the biradical character but depends more on the delocalization of the radical centres at the outer rings.</p>

    DOI: 10.1039/d0sc04583g

  • Role of Spontaneous Orientational Polarization in Organic Donor–Acceptor Blends for Exciton Binding 査読

    Yuuhi Ueda, Hajime Nakanotani, Takuya Hosokai, Yuya Tanaka, Hokuto Hamada, Hisao Ishii, Shuhei Santo, Chihaya Adachi

    Advanced Optical Materials   8 ( 21 )   2000896 - 2000896   2020年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Electron-hole pairs at the interface between electron-donating and electron-accepting molecules form charge-transfer excitons (CTEs) via Coulomb attraction. Generally, the attraction energy of the CTE is weaker than that of the Frenkel exciton because of spatial separation of the charge pair; thus, the binding of the CTE is expected to be sensitive to an electric field. Here, the shielding of the binding energy of the CTEs by an internal electric field induced by spontaneous orientation polarization (SOP) of the solid-state donor-acceptor blend film is reported. When the blend film forms a large SOP, the photogenerated CTEs spontaneously dissociate without an external electric field, resulting in carrier diffusion and carrier lifetimes that are in the milliseconds or longer. In the absence of a large SOP, the CTEs preferentially form exciplexes that quickly release their energy as light rather than dissociation. Hence, the control of SOP in the donor-acceptor blend films can provide new insights into exciton binding and facilitate the development of tailored high-performance organic semiconductor devices.

    DOI: 10.1002/adom.202000896

  • Enhancing spin-orbital coupling in deep-blue/blue TADF emitters by minimizing the distance from the heteroatoms in donors to acceptors 査読

    Minghan Cai, Morgan Auffray, Dongdong Zhang, Yuewei Zhang, Ryo Nagata, Zesen Lin, Xun Tang, Chin-Yiu Chan, Yi-Ting Lee, Tianyu Huang, Xiaozeng Song, Youichi Tsuchiya, Chihaya Adachi, Lian Duan

    Chemical Engineering Journal   127591 - 127591   2020年11月

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    DOI: 10.1016/j.cej.2020.127591

  • Intramolecular-rotation driven triplet-to-singlet upconversion and fluctuation induced fluorescence activation in linearly connected donor–acceptor molecules 査読

    Yuushi Shimoda, Kiyoshi Miyata, Masaki Saigo, Youichi Tsuchiya, Chihaya Adachi, Ken Onda

    The Journal of Chemical Physics   153 ( 20 )   204702 - 204702   2020年11月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/5.0029608

  • Lasing Operation under Long‐Pulse Excitation in Solution‐Processed Organic Gain Medium: Toward CW Lasing in Organic Semiconductors 査読

    Van T. N. Mai, Atul Shukla, A. M. Chathuranganie Senevirathne, Ilene Allison, Hyunsoo Lim, Romain J. Lepage, Sarah K. M. McGregor, Michael Wood, Toshinori Matsushima, Evan G. Moore, Elizabeth H. Krenske, Atula S. D. Sandanayaka, Chihaya Adachi, Ebinazar B. Namdas, Shih‐Chun Lo

    Advanced Optical Materials   8 ( 21 )   2001234 - 2001234   2020年11月

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    DOI: 10.1002/adom.202001234

  • Organic Long‐Persistent Luminescence from a Thermally Activated Delayed Fluorescence Compound 査読

    Wenbo Li, Zhaoning Li, Changfeng Si, Michael Y. Wong, Kazuya Jinnai, Abhishek Kumar Gupta, Ryota Kabe, Chihaya Adachi, Wei Huang, Eli Zysman‐Colman, Ifor D. W. Samuel

    Advanced Materials   32 ( 45 )   2003911 - 2003911   2020年11月

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    DOI: 10.1002/adma.202003911

  • Precise Exciton Management of Quaternary Emission Layers for Highly Stable Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence 査読

    Masaki Tanaka, Ryo Nagata, Hajime Nakanotani, Chihaya Adachi

    ACS Applied Materials & Interfaces   12 ( 45 )   50668 - 50674   2020年11月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Simultaneous achievement of both high electroluminescence efficiency and high operational stability in organic light-emitting diodes (OLEDs) is required for their use in various practical applications. Although OLEDs based on thermally activated delayed fluorescence-Assisted fluorescence (TAF) are considered to possess a promising device architecture to exploit the full potential of OLEDs, the operational stability of such systems still requires further improvement. In this study, a quaternary emission layer consisting of a combination of TAF and mixed-host systems is developed. OLEDs containing this emission layer show improved operational stability through the management of exciton generation processes while maintaining high electroluminescence efficiency. Furthermore, a gradient of the mixed ratio of the co-host matrix is used to optimize the recombination zone profile in the emission layer, leading to 17 times improvement of the operational lifetime compared with that of the corresponding single-host-based device. This research provides a simple and general method to develop highly stable TAF-OLEDs.

    DOI: 10.1021/acsami.0c15208

  • Synthesis and photochromic behaviour of a series of benzopyrans bearing an N-phenyl-carbazole moiety: photochromism control by the steric effect 査読

    Michel Frigoli, Tanguy Jousselin-Oba, Masashi Mamada, Jérôme Marrot, Agnese Zangarelli, Danilo Pannacci, Chihaya Adachi, Fausto Ortica

    Photochemical & Photobiological Sciences   19 ( 10 )   1344 - 1355   2020年10月

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    <p>The phenyl group in blue controls the photochromism of [3<italic>H</italic>]-naphthopyran derivatives by favouring the photoinduced formation of the TT isomer over TC at the photostationary state by steric hindrance.</p>

    DOI: 10.1039/d0pp00202j

  • Hydrogen bond-modulated molecular packing and its applications in high-performance non-doped organic electroluminescence

    Yizhong Shi, Kai Wang, Youichi Tsuchiya, Wei Liu, Takeshi Komino, Xiaochun Fan, Dianming Sun, Gaole Dai, Jiaxiong Chen, Ming Zhang, Caijun Zheng, Shiyun Xiong, Xuemei Ou, Jia Yu, Jiansheng Jie, Chun-Sing Lee, Chihaya Adachi, Xiaohong Zhang

    Materials Horizons   7 ( 10 )   2734 - 2740   2020年10月

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    <p>Suitable intermolecular hydrogen bonding enables the formation of a fixed 3D supramolecular framework and suppresses the exciton nonradiative decays and quenching.</p>

    DOI: 10.1039/d0mh00952k

  • Understanding the Degradation of Spiro‐OMeTAD‐Based Perovskite Solar Cells at High Temperature 査読

    Ganbaatar Tumen-Ulzii, Chuanjiang Qin, Toshinori Matsushima, Matthew R. Leyden, Umamahesh Balijipalli, Dino Klotz, Chihaya Adachi

    Solar RRL   4 ( 10 )   2000305 - 2000305   2020年10月

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    DOI: 10.1002/solr.202000305

  • Fast spin-flip enables efficient and stable organic electroluminescence from charge-transfer states 査読

    Lin-Song Cui, Alexander J. Gillett, Shou-Feng Zhang, Hao Ye, Yuan Liu, Xian-Kai Chen, Ze-Sen Lin, Emrys W. Evans, William K. Myers, Tanya K. Ronson, Hajime Nakanotani, Sebastian Reineke, Jean-Luc Bredas, Chihaya Adachi, Richard H. Friend

    Nature Photonics   14 ( 10 )   636 - 642   2020年10月

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    DOI: 10.1038/s41566-020-0668-z

  • High performance planar microcavity organic semiconductor lasers based on thermally evaporated top distributed Bragg reflector 査読

    Yongsheng Hu, Fatima Bencheikh, Sébastien Chénais, Sébastien Forget, Xingyuan Liu, Chihaya Adachi

    Applied Physics Letters   117 ( 15 )   153301 - 153301   2020年10月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/5.0016052

  • Low Amplified Spontaneous Emission and Lasing Thresholds from Hybrids of Fluorenes and Vinylphenylcarbazole 査読

    Atul Shukla, Van T. N. Mai, A. M. Chathuranganie Senevirathne, Ilene Allison, Sarah K. M. McGregor, Romain J. Lepage, Michael Wood, Toshinori Matsushima, Evan G. Moore, Elizabeth H. Krenske, Atula S. D. Sandanayaka, Chihaya Adachi, Ebinazar B. Namdas, Shih‐Chun Lo

    Advanced Optical Materials   8 ( 20 )   2000784 - 2000784   2020年10月

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    DOI: 10.1002/adom.202000784

  • Partial Modification of Electron-withdrawing Groups in Thermally-activated Delayed Fluorescence Materials Aimed to Improve Efficiency and Stability 査読

    Masayuki Yokoyama, Youichi Tsuchiya, Hajime Nakanotani, Chihaya Adachi

    Chemistry Letters   49 ( 10 )   1189 - 1193   2020年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Highly efficient and stable blue-green thermally-activated delayed fluorescence (TADF) molecules with trifluoromethyl (CF3) groups were developed. Partial modification with CF3 groups at the appropriate position of the donor moiety improved the luminescence efficiency and excited state stability. OLEDs using modified emitters showed improved EQE and operational lifetime compared with unmodified examples.

    DOI: 10.1246/cl.200435

  • Organic Photostimulated Luminescence

    Manabu Sakurai, Ryota Kabe, Masaaki Fuki, Zesen Lin, Kazuya Jinnai, Yasuhiro Kobori, Chihaya Adachi, Takashi Tachikawa

    2020年9月

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    Photostimulated luminescence, which allows energy or data to be stored and released using electromagnetic waves as both the input and output, has attracted considerable interest in the fields of biomedical and informatics technologies, but this phenomenon is mostly limited to solid inorganic materials. Here, we report photostimulated luminescence from purely organic blend films composed of electron donor, acceptor, and trap/emitter molecules. In the films, charges are accumulated as radical ions by ultraviolet light irradiation and then extracted by near infrared light irradiation to produce visible light. Films are capable of multiple cycles (>10 times) of organic photostimulated luminescence, which was still observable from films left in the dark at room temperature for one week after excitation, and emission color could be varied by changing the trap/emitter molecules. These findings will broadly impact existing applications and provide new prospects for innovative flexible devices.

    DOI: 10.26434/chemrxiv.12956456

  • The effect of current density–voltage measurement conditions on the operational stability of hybrid perovskite solar cells 査読

    Ganbaatar Tumen-Ulzii, Toshinori Matsushima, Dino Klotz, Chihaya Adachi

    Applied Physics Letters   117 ( 10 )   103503 - 103503   2020年9月

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    DOI: 10.1063/5.0023622

  • Stable room-temperature continuous-wave lasing in quasi-2D perovskite films 査読

    Chuanjiang Qin, Atula S. D. Sandanayaka, Chenyang Zhao, Toshinori Matsushima, Dezhong Zhang, Takashi Fujihara, Chihaya Adachi

    Nature   585 ( 7823 )   53 - 57   2020年9月

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    Organic–inorganic lead halide quasi-two-dimensional (2D) perovskites are promising gain media for lasing applications because of their low cost, tunable colour, excellent stability and solution processability1,2,3. Optically pumped continuous-wave (CW) lasing is highly desired for practical applications in high-density integrated optoelectronics devices and constitutes a key step towards electrically pumped lasers4,5,6. However, CW lasing has not yet been realized at room temperature because of the ‘lasing death’ phenomenon (the abrupt termination of lasing under CW optical pumping), the cause of which remains unknown. Here we study lead halide-based quasi-2D perovskite films with different organic cations and observe that long-lived triplet excitons considerably impede population inversion during amplified spontaneous emission and optically pumped pulsed and CW lasing. Our results indicate that singlet–triplet exciton annihilation is a possible intrinsic mechanism causing lasing death. By using a distributed-feedback cavity with a high quality factor and applying triplet management strategies, we achieve stable green quasi-2D perovskite lasers under CW optical pumping in air at room temperature. We expect that our findings will pave the way to the realization of future current-injection perovskite lasers.

    DOI: 10.1038/s41586-020-2621-1

  • The Leap from Organic Light-Emitting Diodes to Organic Semiconductor Laser Diodes 査読

    Chihaya Adachi, Atula S. D. Sandanayaka

    CCS Chemistry   2 ( 4 )   1203 - 1216   2020年8月

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    DOI: 10.31635/ccschem.020.202000327

  • Sub-Microsecond TADF Emission in D-D′-A Emitters 査読

    Morgan Auffray, Umamahesh Balijapalli, Jean-Charles Ribierre, Youichi Tsuchiya, Chihaya Adachi

    Chemistry Letters   49 ( 8 )   932 - 935   2020年8月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/cl.200337

  • Surface Segregation of a Star-Shaped Polyhedral Oligomeric Silsesquioxane in a Polymer Matrix 査読

    Kentaro Yamamoto, Daisuke Kawaguchi, Tatsuki Abe, Takeshi Komino, Masashi Mamada, Taizo Kabe, Chihaya Adachi, Kensuke Naka, Keiji Tanaka

    Langmuir   36 ( 33 )   9960 - 9966   2020年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A simple way to control only the surface properties of polymer materials, without changing the bulk properties, has long been desired. The segregation behavior when a component with a tiny amount fed into the matrix is thermodynamically enriched at the surface is one of the candidate methods. This capability was examined herein by focusing on a star-shaped polyhedral oligomeric silsesquioxane (s-POSS), where the central POSS unit is tethered to eight isobutyl-substituted POSS cages as a surface modifier. X-ray photoelectron spectroscopy revealed that the surface of a film of poly(methyl methacrylate) (PMMA) was almost completely covered with POSS units by adding just 5 wt &#37; s-POSS to it. The segregated POSS dramatically altered the physical properties such as molecular motion and the mechanical and dielectric responses at the surface of the PMMA film. These findings make it clear that s-POSS is an excellent surface modifier for glassy polymers.

    DOI: 10.1021/acs.langmuir.0c01785

  • Near-infrared absorbing pyrrolopyrrole aza-BODIPY-based donor-acceptor polymers with reasonable photoresponse

    Ru Feng, Narumi Sato, Mayuka Nomura, Akinori Saeki, Hajime Nakanotani, Chihaya Adachi, Takuma Yasuda, Hiroyuki Furuta, Soji Shimizu

    Journal of Materials Chemistry C   8 ( 26 )   8770 - 8776   2020年7月

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    © The Royal Society of Chemistry. Designing near-infrared (NIR) absorbing donor-acceptor (D-A) polymers with photoresponse beyond 900 nm has remained a challenge in the area of organic photovoltaics (OPV) owing to the limited kinds of strong electron acceptors. Here we present the use of pyrrolopyrrole aza-BODIPY (PPAB) as a new acceptor group in D-A polymers in place of a conventional diketopyrrolopyrrole acceptor to achieve power conversion efficiencies up to 2.27&#37; despite the ultra-small bandgap of 1.08 eV. The small photon energy loss of the PPAB-based D-A polymer and moderately high short-circuit current of 8.52 mA cm-2 arising from the panchromatic visible/NIR absorption guarantee PPAB as a potential building block of D-A polymers for NIR photovoltaics. This journal is

    DOI: 10.1039/d0tc01487g

  • Nanoscale Electronic Properties of Triplet-State-Engineered Halide Perovskites 査読

    Ghaida Alosaimi, Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi, Jan Seidel

    The Journal of Physical Chemistry C   124 ( 27 )   14811 - 14817   2020年7月

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    DOI: 10.1021/acs.jpcc.0c03996

  • High EQE and high brightness solution-processed TADF light-emitting transistors and OLEDs 査読 国際誌

    Viqar Ahmad; Jan Sobus; Fatima Bencheikh; Masashi Mamada; Chihaya Adachi ; Shih-Chun Lo; Ebinazar B. Namdas

    Viqar Ahmad; Jan Sobus; Fatima Bencheikh; Masashi Mamada; Chihaya Adachi ; Shih-Chun Lo; Ebinazar B. Namdas   8 ( 11 )   2000554   2020年7月

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    記述言語:英語  

    DOI: 10.1002/adom.202000554

  • Ion Migration-Induced Degradation and Efficiency Roll-off in Quasi-2D Perovskite Light-Emitting Diodes 査読

    Tai Cheng, Ganbaatar Tumen-Ulzii, Dino Klotz, Satoru Watanabe, Toshinori Matsushima, Chihaya Adachi

    ACS Applied Materials & Interfaces   12 ( 29 )   33004 - 33013   2020年7月

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    DOI: 10.1021/acsami.0c06737

  • Visual Understanding of Vibronic Coupling and Quantitative Rate Expression for Singlet Fission in Molecular Aggregates 査読

    Katsuyuki Shizu, Chihaya Adachi, Hironori Kaji

    Bulletin of the Chemical Society of Japan   2020年6月

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    DOI: 10.1246/bcsj.20200159

  • An organic laser dye having a small singlet-triplet energy gap makes the selection of a host material easier 査読 国際誌

    Buddhika S. B. Karunathilaka; Umamahesh Balijapalli; Chathuranganie A. M. Senevirathne; Yu Esaki; Toshinori Matsushima; Atula S. D. Sandanayaka; Chihaya Adachi

    Advanced Functional Materials   30 ( 30 )   2001078   2020年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Quenching of singlets by long-lived triplets is a serious issue for lasing from organic laser dyes, especially under long pulse excitation. As a strategy to scavenge or manage unnecessary triplets, an organic laser dye is dispersed into a host material having high singlet and low triplet energy levels [a large singlet-triplet energy gap (Delta E-ST)]. However, finding such a host material having a triplet scavenging capability is limited. In this study, an organic laser dye, 2,6-dicyano-1,1-diphenyl-lambda(5)sigma(4)-phosphinine (DCNP), having a small Delta E-ST of approximate to 0.44 eV is synthesized, and thus 4-4 '-bis[(N-carbazole)styryl] biphenyl (BSBCz) can be employed as a triplet scavenging host, i.e., the triplets formed on DCNP are easily transferred to BSBCz. A 1 wt&#37;-DCNP-doped BSBCz film is formed on a mixed-order distributed feedback grating, showing lasing with a low threshold value of approximate to 0.86 mu J cm(-2) and a full-width-at-half-maximum value of approximate to 0.5 nm. Because of the suppressed singlet-triplet annihilation, DCNP-based laser devices operating under a continuous-wave regime, with a low threshold of 72 W cm(-2) and a long laser half-lifetime of approximate to 3 min, are demonstrated. These results indicate a possibility of the wider selection of host materials, easing a material design strategy of fabricating high-performance laser devices in future.

    DOI: 10.1002/adfm.202001078

  • Exciton-exciton annihilation in thermally activated delayed fluorescence emitter 査読 国際誌

    Monirul Hasan; Atul Shukla; Viqar Ahmad; Jan Sobus; Fatima Bencheikh; Sarah M. K. McGregor; Masashi Mamada; Chihaya Adachi ; Shih-Chun Lo; Ebinazar B. Namdas

    Advanced Functional Materials   2000580   2020年6月

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    記述言語:英語  

    DOI: 10.1002/adfm.202000580

  • Enhancing Small-Molecule Organic Photodetector Performance for Reflectance-Mode Photoplethysmography Sensor Applications 査読

    Anubha Bilgaiyan, Fahed Elsamnah, Hiroshi Ishidai, Chang-Hoon Shim, Muhamad Affiq Bin Misran, Chihaya Adachi, Reiji Hattori

    ACS Applied Electronic Materials   2 ( 5 )   1280 - 1288   2020年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic photodetector performance for enhancing the sensing abilities of an organic photoplethysmography sensor was investigated. The optimized organic photodetector with an anode interlayer and a cathode interlayer showed a reverse dark current density of 22 nA cm(-2) at -2 V and an external quantum efficiency of 53.3&#37; at 0 V. This organic photodetector was fabricated monolithically with an organic light-emitting diode on a glass substrate to achieve a reflectance-mode photoplethysmography sensor, demonstrating the impact of organic photodetector device performance on the measured photoplethysmography signal for sensing applications. Furthermore, we estimated the optimal sensor design for circular geometry in terms of device area and distance between the organic light-emitting diode and organic photodetector to maximize the signal-to-noise ratio and lower the power consumption of organic photoplethysmography sensor devices. For the most favorable photoplethysmography sensor design, a signal strength of 130 mV with 600 mu W power consumption was measured.

    DOI: 10.1021/acsaelm.0c00082

  • A 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile (HAT-CN) transport layer with high electron mobility for thick organic light-emitting diodes 査読 国際誌

    Kenta Yamaguchi; Toshinori Matsushima; Chihaya Adachi

    AIP Advances   10   055304   2020年5月

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    記述言語:英語  

    DOI: 10.1063/5.0007310

  • Hysteresis-less and stable perovskite solar cells with a self-assembled monolayer 査読 国際誌

    Ganbaatar Tumen-Ulzii; Toshinori Matsushima; Dino Klotz; Matthew R. Leyden; Pangpang Wang; Chuanjiang Qin; Jin-Wook Lee; Sung-Joon Lee; Yang Yang; Chihaya Adachi

    Communications Materials   1   31   2020年5月

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    記述言語:英語  

    DOI: 10.1038/s43246-020-0028-z

  • F8BT Oligomers for Organic Solid-State Lasers 査読 国際誌

    Masashi Mamada; Ryutaro Komatsu; Chihaya Adachi

    ACS Appl. Mater. Interfaces   12 ( 25 )   28383 - 28391   2020年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acsami.0c05449

  • Enhanced operational durability of thermally activated delayed fluorescence-based organic light-emitting diodes with a triazine electron transporter 査読 国際誌

    Kenta Yamaguchi; Toshinori Matsushima; Atula S. D. Sandanayaka; Yoko Homma; Naoki Uchida; Chihaya Adachi

    Chemistry A European Journal   26 ( 25 )   5598 - 5602   2020年5月

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    記述言語:英語  

    DOI: 10.1002/chem.201905345

  • Molecular Design Based on Donor-Weak Donor Scaffold for Blue Thermally-Activated Delayed Fluorescence Designed by Combinatorial DFT Calculations 査読

    Youichi Tsuchiya, Keita Tsuji, Ko Inada, Fatima Bencheikh, Yan Geng, H. Shaun Kwak, Thomas J.L. Mustard, Mathew D. Halls, Hajime Nakanotani, Chihaya Adachi

    Frontiers in Chemistry   8   2020年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Quantum chemical calculations are necessary to develop advanced emitter materials showing thermally-activated delayed fluorescence (TADF) for organic light-emitting diodes (OLEDs). However, calculation costs become problematic when more accurate functionals were used, therefore it is judicious to use a multimethod approach for efficiency. Here we employed combinatorial chemistry in silico to develop the deep blue TADF materials with a new concept of homo-junction design. The homo-junction materials containing TADF candidates designed by calculation were synthesized and analyzed. We found that these materials showed the emission from charge transfer (CT) state, and the clear delayed emission was provided in solid state. Because the homo-junction TADF materials showed three exponential decayed emission in solid state, we employed novel four-state kinetic analysis.

    DOI: 10.3389/fchem.2020.00403

  • 【2020-2】Effect of Vibronic Coupling on Correlated Triplet Pair Formation in the Singlet Fission Process of Linked Tetracene Dimers 査読

    Shizu, K., Adachi, C., Kaji, H.

    J. Phys. Chem. A   124 ( 18 )   3641 - 3651   2020年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Excited State Dynamics of Thermally Activated Delayed Fluorescence from an Excited State Intramolecular Proton Transfer System 査読 国際誌

    Yun Long; Masashi Mamada; Chunyong Li; Paloma Lays dos Santos; Marco Colella; Andrew Danos; Chihaya Adachi; Andrew Monkman

    The Journal of Physical Chemistry Letters   11 ( 9 )   3305 - 3312   2020年4月

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    記述言語:英語  

    DOI: 10.1021/acs.jpclett.0c00498

  • Stoichiometry control for the tuning of grain passivation and domain distribution in green quasi-2D metal halide perovskite films and light-emitting diodes 査読 国際誌

    Tai Cheng; Chuanjiang Qin; Satoru Watanabe; Toshinori Matsushima; Chihaya Adachi

    Advanced Functional Materials   30 ( 24 )   2001816   2020年4月

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    記述言語:英語  

    DOI: 10.1002/adfm.202001816

  • Nanosecond-Time-Scale Delayed Fluorescence Molecule for Deep-Blue OLEDs with Small Efficiency Rolloff 査読 国際誌

    Jong Uk Kim; In Seob Park; Chin-Yiu Chan; Masaki Tanaka; Youichi Tsuchiya; Hajime Nakanotani; Chihaya Adachi

    Nature Communications   11   1965   2020年4月

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    記述言語:英語  

    DOI: 10.1038/s41467-020-15558-5

  • Many exciplex systems exhibit organic long-persistent luminescence 査読 国際誌

    Naohiro Nishimura; Zesen Lin; Kazuya Jinnai; Ryota Kabe; Chihaya Adachi

    Advanced Functional Materials   30 ( 22 )   2000795   2020年4月

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    記述言語:英語  

    DOI: 10.1002/adfm.202000795

  • Killer Impurities in Vacuum Chamber that Affect the Lifetime of Organic Light-Emitting Diodes 査読 国際誌

    Hiroshi Fujimoto; Toshimitsu Nakamura; Kaori Nagayoshi; Kentaro Harada; Hiroshi Miyazaki; Takaomi Kurata; Junya Kiyota; Chihaya Adachi

    Applied Physics Letters   116   143301   2020年4月

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    記述言語:英語  

    DOI: 10.1063/1.5141101

  • Understanding degradation of organic lightemitting diodes from magnetic field effects 査読 国際誌

    Masaki Tanaka; Ryo Nagata; Hajime Nakanotani; Chihaya Adachi

    Communication Materials   1 ( 1 )   18   2020年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s43246-020-0019-0

  • Detrimental Effect of Unreacted PbI2 on the Long-Term Stability of Perovskite Solar Cells 査読 国際誌

    Ganbaatar Tumen-Ulzii; Chuanjiang Qin; Dino Klotz; Matthew R. Leyden ; Pangpang Wang; Morgan Auffray; Takashi Fujihara; Toshinori Matsushima; Jin-Wook Lee; Sung-Joon Lee; Yang Yang; Chihaya Adachi

    Advanced Materials   1905035   2020年4月

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    記述言語:英語  

    DOI: 10.1002/adma.201905035

  • A spirofluorene-end-capped bis-stilbene derivative with a low amplified spontaneous emission threshold and balanced hole and electron mobilities 査読 国際誌

    Shi-Bin Ruan; Chin-Yiu Chan; Hao Ye; Ko Inada; Fatima Bencheikh; Atula S. D. Sandanayaka; Toshinori Matsushima; Chihaya Adachi

    Optical Materials   100   109636   2020年2月

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    記述言語:英語  

    DOI: 10.1016/j.optmat.2019.109636

  • Triplet management for efficient perovskite light-emitting diodes 査読

    Chuanjiang Qin, Toshinori Matsushima, William J. Potscavage, Atula S. D. Sandanayaka, Matthew R. Leyden, Fatima Bencheikh, Kenichi Goushi, Fabrice Mathevet, Benoit Heinrich, Go Yumoto, Yoshihiko Kanemitsu, Chihaya Adachi

    NATURE PHOTONICS   14 ( 2 )   70 - +   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Careful harvesting of triplet excitons allows the realization of efficient green-emitting quasi-2D perovskite LEDs.Perovskite light-emitting diodes are promising for next-generation lighting and displays because of their high colour purity and performance(1). Although the management of singlet and triplet excitons is fundamental to the design of efficient organic light-emitting diodes, the nature of how excitons affect performance is still not clear in perovskite(2-4) and quasi-two-dimensional (2D) perovskite-based devices(5-9). Here, we show that triplet excitons are key to efficient emission in green quasi-2D perovskite devices and that quenching of triplets by the organic cation is a major loss path. Employing an organic cation with a high triplet energy level (phenylethylammonium) in a quasi-2D perovskite based on formamidinium lead bromide yields efficient harvesting of triplets. Furthermore, we show that upconversion of triplets to singlets can occur, making 100&#37; harvesting of electrically generated excitons potentially possible. The external quantum and current efficiencies of our green (527 nm) devices reached 12.4&#37; and 52.1 cd A(-1), respectively.

    DOI: 10.1038/s41566-019-0545-9

  • Utilization of multi hetero-donors in thermally activated delayed fluorescence molecules and their high performance bluish-green OLEDs 査読 国際誌

    Umamahesh Balijapalli; Masaki Tanaka; Morgan Auffray; Chin-Yiu Chan; Yi-Ting Lee; Youichi Tsuchiya; Hajime Nakanotani; Chihaya Adachi

    ACS Appl. Mater. Interfaces   12 ( 8 )   9498 - 9506   2020年2月

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    記述言語:英語  

    DOI: 10.1021/acsami.9b20020

  • Intersystem Crossing Rate in Thermally Activated Delayed Fluorescence Emitters 査読

    Takashi Kobayashi, Daisuke Kawate, Akitsugu Niwa, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito

    Physica Status Solidi (A) Applications and Materials Science   217 ( 3 )   2020年2月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim For a better understanding of the exciton decay process in thermally activated delayed fluorescence (TADF) emitters, the intersystem crossing rate, kISC, is one of the important physical constants that have to be determined. Herein, a method to calculate the kISC value from photoluminescence (PL) measurements is reconsidered. The kISC value can be determined at very low temperatures where delayed fluorescence (DF) is completely suppressed, as well as around room temperature where triplet excitons mainly decay into the ground state by emitting DF. However, there is a temperature range where the kISC value cannot be determined accurately because the influences of nonradiative decay paths can be neither ignored nor corrected. For such a temperature range, an alternative approach, which utilizes the temperature dependence of an observed PL decay rate, is presented. In this way, kISC values from 300 to 10 K are determined for thin films of two TADF emitters, i.e., 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene and 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene, which are known as 4CzIPN and 2CzPN, respectively.

    DOI: 10.1002/pssa.201900616

  • Highly effective nicotinonitrile-derivatives-based thermally activated delayed fluorescence emitter with asymmetric molecular architecture for high-performance organic light-emitting diodes 査読

    Shin Hyung Choi, Chan Hee Lee, Chihaya Adachi, Sae Youn Lee

    Dyes and Pigments   172   2020年1月

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    記述言語:英語  

    In this paper, we report a new molecular architecture for increasing the emission efficiency of nicotinonitrile-derivatives-based donor-acceptor-donor combined thermally activated delayed fluorescence (TADF) emitters with asymmetric molecular architecture. The proposed molecular design facilitates highly effective TADF emission through a relatively small singlet (S1) and triplet (T1) energy gap (ΔEST ≈ 0.1 eV) and provides an increased reverse intersystem crossing efficiency (ΦRISC) of up to 86&#37; from T1 to S1 states. Organic light-emitting diodes (OLEDs) employing the proposed asymmetric nicotinonitrile derivatives as emitters exhibit external quantum efficiencies (ηext) of up to 18.5&#37; in greenish-blue and green emissions.

    DOI: 10.1016/j.dyepig.2019.107849

  • The Role of reverse intersystem crossing using a TADF-type acceptor molecule on the device stability of exciplex based organic-light emitting diodes 査読 国際誌

    Thanh Ba Nguyen; Hajime Nakanotani; Takuji Hatakeyama; Chihaya Adachi

    Advanced Materials   32 ( 9 )   1906614   2020年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Exciplex system exhibiting thermally activated delayed fluorescence (TADF) holds a considerable potential to improve organic light-emitting diode (OLED) performances. However, the operational lifetime of current exciplex-based devices, unfortunately, falls far behind the requirement for commercialization. Herein, rationally choosing a TADF-type electron acceptor molecule is reported as a new strategy to enhance OLEDs' operating lifetime. A comprehensive study of the exciplex system containing 9,9 ',9 ''-triphenyl-9H,9 ' H,9 '' H-3,3 ':6 ',3 ''-tercarbazole (Tris-PCz) and triazine (TRZ) derivatives clarifies the relationship between unwanted carrier recombination on acceptor molecules, TADF property of acceptors, and the device degradation event. By employing a proposed "exciton recycling" strategy, a threefold increased operational lifetime can be achieved while still maintaining high-performance OLED properties. In particular, a stable blue OLED that employs this strategy is successfully demonstrated. This research provides an important step for exciplex-based devices toward the significant improvement of operational stability.

    DOI: 10.1002/adma.201906614

  • Design strategy for robust organic semiconductor laser dyes 査読 国際誌

    Yuya Oyama; Masashi Mamada; Atul Shukla; Evan G. Moore; Shih-Chun Lo; Ebinazar B. Namdas; Chihaya Adachi

    ACS Materials Letters   2 ( 2 )   161 - 167   2020年1月

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    記述言語:英語  

    DOI: 10.1021/acsmaterialslett.9b00536

  • Interplay among thermoelectric properties, atmospheric stability, and electronic structures in solution-deposited thin films of P(NaX[Niett]) 査読 国際誌

    Sunbin Hwang; William J. Potscavage, Chihaya Adachi

    Advanced Electronic Materials   6 ( 3 )   1901172   2020年1月

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    記述言語:英語  

    DOI: 10.1002/aelm.201901172

  • Molecular orientation of disk-shaped small molecule exhibiting thermally activated delayed fluorescence in host-guest films 査読 国際誌

    Masaki Tanaka; Hiroki Noda; Hajime Nakanotani; Chihaya Adachi

    Applied Physics Letters   116 ( 2 )   023302   2020年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Control of the molecular orientation in a glassy film is a crucial issue, not only for an understanding of the fundamental processes of organic amorphous film formation but also for enhancement of the performance of organic light-emitting diodes (OLEDs) by increasing their light-outcoupling efficiency. In this study, the molecular orientation in codeposited films composed of a host molecule and a disk-shaped emitter that exhibits thermally activated delayed fluorescence is investigated systematically. It is found that the orientation of the transition dipole moment (TDM) of the disk-shaped emitters is strongly dependent on the glass transition temperature and the polarization of the host molecules, and almost perfectly horizontal orientation of the TDM of the disk-shaped emitters can be realized. Our findings clarify the role of the host-guest dipole-dipole interaction in the molecular orientation, and it will enable the expansion of both the molecular design and the material combination rules for high-performance OLEDs.

    DOI: 10.1063/1.5140210

  • Molecular design of highly effective thermally activated delayed fluorescence emitters based on ortho-substituted donor-acceptor-donor pyridinecarbonitrile derivatives and their application for high-performance OLEDs 査読

    Shin Hyung Choi, Chan Hee Lee, Chihaya Adachi, Sae Youn Lee

    Dyes and Pigments   171   2019年12月

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    記述言語:英語  

    In this work, we designed and investigated two TADF molecules, AcCN and PxCN, introducing donor moieties into the 3,5-position of 4-pyridinecarbonitrile acceptor core. These D‒A‒D type compounds exhibit effective utilization of triplet excitons through a reverse intersystem crossing (RISC) process with relatively small singlet-triplet energy splitting (ΔEST) values less than 0.1 eV. With their high PL quantum yield (ΦPL) and sufficient rate constant for RISC process (kRISC), organic light-emitting diodes (OLEDs) employing AcCN and PxCN as emitters achieve a maximum external quantum efficiency (ηext) of 20.6&#37; and 15.5&#37;, respectively, with green emissions.

    DOI: 10.1016/j.dyepig.2019.107775

  • Enhanced Energy Transfer in Doped Bifluorene Single Crystals: Prospects for Organic Lasers 査読 国際誌

    Paulius Baronas; Gediminas Kreiza; Masashi Mamada; Satoshi Maedera; Povilas Adomėnas; Ona Adomėnienė; Karolis Kazlauskas; Chihaya Adachi; Saulius Juršėnas

    Advanced Optical Materials   1901670   2019年12月

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    記述言語:英語  

    DOI: 10.1002/adom.201901670

  • Orange Organic Long-persistent Luminescence from an Electron Donor/Acceptor Binary System 査読 国際誌

    Zesen Lin; Ryota Kabe; Chihaya Adachi

    Chemistry Letters   49 ( 2 )   203 - 206   2019年12月

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    記述言語:英語  

    DOI: 10.1246/cl.190823

  • Observation of Nonradiative Deactivation Behavior from Singlet and Triplet States of Thermally Activated Delayed Fluorescence Emitters in Solution 査読 国際誌

    Naoto Notsuka; Hajime Nakanotani; Hiroki Noda; Kenichi Goushi; Chihaya Adachi

    J. Phys. Chem. Lett.   11 ( 2 )   562 - 566   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Excited states of emissive organic molecules undergo various kinds of quenching phenomena such as vibration-coupled quenching depending on their environmental conditions. Because bright singlet excitons in purely organic molecules exhibiting thermally activated delayed fluorescence (TADF) can access dark triplet excited states, photogenerated singlet excitons can decay nonradiatively through both singlet and triplet excited states. Here, we investigated nonradiative decay behavior, including internal and external exciton quenching processes, of various types of TADF materials in solution. Under air-saturated conditions, both the lowest singlet and triplet excited states of almost all of the TADF materials showed oxygen quenching. We considered the effect of oxygen quenching for both spin states to develop a method for determination of the triplet contribution to the total photoluminescence quantum yield from the transient photoluminescence profiles. Furthermore, we observed a clear energy gap law for the internal nonradiative processes.

    DOI: 10.1021/acs.jpclett.9b03302

  • Slow recombination of spontaneously dissociated organic fluorophore excitons 査読 国際誌

    Takahiko Yamanaka; Hajime Nakanotani; Chihaya Adachi

    Nature Communications   10   5748   2019年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The harvesting of excitons as luminescence by organic fluorophores forms the basis of light-emitting applications. Although high photoluminescence quantum yield is essential for efficient light emission, concentration-dependent quenching of the emissive exciton is generally observed. Here we demonstrate generation and accumulation of concentration-dependent "long-lived" (i.e., over 1 h) photo-generated carriers and the successive release of their energy as electroluminescence in a solid-state film containing a polar fluorophore. While fluorophore excitons are generally believed to be stable because of their high exciton binding energies, our observations show that some of the excitons undergo spontaneous exciton dissociation in a solid-state film by spontaneous orientation polarization even without an external electric field. These results lead to the reconsideration of the meaning of "luminescence quantum yield" for the solid films containing polar organic molecules because it can differ for optical and electrical excitation.

    DOI: 10.1038/s41467-019-13736-8

  • Thermally activated delayed fluorescence with 7&#37; external quantum efficiency from a light-emitting electrochemical cell 査読 国際誌

    Petter Lundberg; Youichi Tsuchiya; E. Mattias Lindh; Shi Tang; Chihaya Adachi; Ludvig Edman

    Nature Communications   10   5307   2019年11月

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    記述言語:英語  

    DOI: 10.1038/s41467-019-13289-w

  • Origin of external quantum efficiency roll-off in 4,4′-bis[(N-carbazole)styryl]biphenyl (BSBCz)-based inverted organic light emitting diode under high pulsed electrical excitation 査読 国際誌

    Fatima Bencheikh; Atula S. D. Sandanayaka; Toshiya Fukunaga; Toshinori Matsushima; Chinaya Adachi

    Journal of Applied Physics   126 ( 18 )   185501   2019年11月

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    記述言語:英語  

    DOI: 10.1063/1.5121485

  • Excited-state stability of quasi-two-dimensional metal halide perovskite films under optical and electrical excitations 査読 国際誌

    Satoru Watanabe; Tai Cheng; Ganbaatar Tumen-Ulzii; Chuanjiang Qin; Toshinori Matsushima; Chihaya Adachi

    Applied Physics Letters   115 ( 23 )   233502   2019年11月

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    記述言語:英語  

    DOI: 10.1063/1.5127308

  • Through Space Charge Transfer for Efficient Sky-Blue Thermally Activated Delayed Fluorescence (TADF) Emitter with Unconjugated Connection 査読 国際誌

    Ya-Kun Wang; Chen-Chao Huang; Hao Ye; Cheng Zhong; Aziz Khan; Sheng-Yi Yang; Man-Keung Fung; Zuo-Quan Jiang; Chihaya Adachi; Liang-Sheng Liao

    Advanced Optical Materials   1901150   2019年11月

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    記述言語:英語  

    DOI: 10.1002/adom.201901150

  • Triplet–triplet upconversion enhanced by spin–orbit coupling in organic light-emitting diodes 査読 国際誌

    Ryota Ieuji; Kenichi Goushi; Chihaya Adachi

    Nature Communications   10   5283   2019年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Triplet-triplet upconversion, in which two triplet excitons are converted to one singlet exciton, is a well-known approach to exceed the limit of electroluminescence quantum efficiency in conventional fluorescence-based organic light-emitting diodes. Considering the spin multiplicity of triplet pairs, upconversion efficiency is usually limited to 20&#37;. Although this limit can be exceeded when the energy of a triplet pair is lower than that of a second triplet excited state, such as for rubrene, it is generally difficult to engineer the energy levels of higher triplet excited states. Here, we investigate the upconversion efficiency of a series of new anthracene derivatives with different substituents. Some of these derivatives show upconversion efficiencies close to 50&#37; even though the calculated energy levels of the second triplet excited states are lower than twice the lowest triplet energy. A possible upconversion mechanism is proposed based on the molecular structures and quantum chemical calculations.

    DOI: 10.1038/s41467-019-13044-1

  • Detecting and identifying reversible changes in perovskite solar cells by electrochemical impedance spectroscopy 査読 国際誌

    Dino Klotz; Ganbaatar Tumen-Ulzii; Chuanjiang Qin; Toshinori Matsushima; Chihaya Adachi

    RSC Advances   9   33436 - 33445   2019年10月

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    記述言語:英語  

    DOI: 10.1039/C9RA07048F

  • Film Transfer of Structured Organo-Lead-Halide Perovskite for Low-Cost Lasing Applications 査読 国際誌

    Matthew R. Leyden; Toshinori Matsushima; Fatima Bencheikh; Chihaya Adachi

    Applied Physics Letters   115 ( 14 )   141106   2019年10月

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    記述言語:英語  

    DOI: 10.1063/1.5113647

  • Origin of dual emission in σ-bridged donor–acceptor TADF compounds 査読 国際誌

    Rokas Skiasgiris; Tomas Serevisius; Karolis Kazlauskas; Yan Geng; Chihaya Adachi; Saulius Jursenas

    Journal of Materials Chemistry C   7   12601 - 12609   2019年9月

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    記述言語:英語  

    DOI: 10.1039/C9TC03548F

  • High-Triplet-Energy Bipolar Host Materials Based on Phosphine Oxide Derivatives for Efficient Sky-Blue Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes with Reduced Roll-off 査読 国際誌

    Jong Uk Kim; Michael Y. Wong; Shiv Kumar; Oliver G. Hayes; Finlay Duncan; Chin-Yiu Chan; Ben Yiu-Wing Wong; Hao Ye; Lin-Song Cui; Hajime Nakanotani; Eli Zysman-Colman; Chihaya Adachi

    Chemistry Letters   48 ( 10 )   1225 - 1228   2019年9月

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    記述言語:英語  

    DOI: 10.1246/cl.190412

  • Large metal halide perovskite crystals for field-effect transistor applications 査読 国際誌

    Toshinori Matsushima; Matthew R. Leyden; Takashi Fujihara; Chuanjiang Qin; Atula S. D. Sandanayaka; Chihaya Adachi

    Applied Physics Letters   115   120601   2019年9月

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    記述言語:英語  

    DOI: 10.1063/1.5116411

  • Luminescent Cu(I) and Ag(I) Coordination Polymers: Fast Phosphorescence or Thermally Activated Delayed Fluorescence 査読 国際誌

    Gang-Yuan Li; Hao Ye; Fu-Cheng Zhu; Yan Geng; Jian-Zhong Fan; Jian-Ping Ma; Chihaya Adachi; Yu-Bin Dong

    Chinese Chemical Letters   30 ( 11 )   1931 - 1934   2019年9月

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    記述言語:英語  

    DOI: 10.1016/j.cclet.2019.08.006

  • Critical role of intermediate electronic states for spin-flip processes in charge-transfer-type organic molecules with multiple donors and acceptors 査読 国際誌

    Hiroki Noda; Xian-Kai Chen; Hajime Nakanotani; Takuya Hosokai; Momoka Miyajima; Naoto Noutsuka; Yuuki Kashima; Jean-Luc Bredas; Chihaya Adachi

    Nature Materials   18 ( 10 )   1084 - 1090   2019年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Spin-flip in purely organic molecular systems is often described as a forbidden process; however, it is commonly observed and utilized to harvest triplet excitons in a wide variety of organic material-based applications. Although the initial and final electronic states of spin-flip between the lowest singlet and lowest triplet excited state are self-evident, the exact process and the role of intermediate states through which spin-flip occurs are still far from being comprehensively determined. Here, via experimental photo-physical investigations in solution combined with first-principles quantum-mechanical calculations, we show that efficient spin-flip in multiple donor-acceptor charge-transfer-type organic molecular systems involves the critical role of an intermediate triplet excited state that corresponds to a partial molecular structure of the system. Our proposed mechanism unifies the understanding of the intersystem crossing mechanism in a wide variety of charge-transfer-type molecular systems, opening the way to greater control over spin-flip rates.

    DOI: 10.1038/s41563-019-0465-6

  • Carrier Recombination and Diffusion in Wet-Cast Tin Iodide Perovskite Layers Under High Intensity Photoexcitation 査読 国際誌

    Patrik Ščajev; Ramunas Aleksiejunas; Paulius Baronas; Džiugas Litvinas; Marek Kolenda; Chuanjiang Qin; Takashi Fujihara; Toshinori Matsushima; Chihaya Adachi; Saulius Juršėnas

    J. Phys. Chem. C   123 ( 32 )   19275 - 19281   2019年7月

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    記述言語:英語  

    DOI: 10.1021/acs.jpcc.9b03226

  • High performance from extraordinarily thick organic light-emitting diodes 査読 国際誌

    Toshinori Matsushima; Fatima Bencheikh; Takeshi Komino; Matthew R. Leyden; Atula S. D. Sandanayaka; Chuanjiang Qin; Chihaya Adachi

    Nature   572   502 - 506   2019年7月

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    記述言語:英語  

    DOI: 10.1038/s41586-019-1435-5

  • Red/Near-Infrared Thermally Activated Delayed Fluorescence OLEDs with Near 100&#37; Internal Quantum Efficiency 査読 国際誌

    Jia-Xiong Chen; Wen-Wen Tao; Wen-Cheng Chen; Ya-Fang Xiao; Kai Wang; Chen Cao ; Jia Yu; Shengliang Li; Feng-Xia Geng; Chihaya Adachi; Chun-Sing Lee; Xiao-Hong Zhang

    Angewandte Chemie International Edition   58 ( 41 )   14660 - 14665   2019年6月

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    記述言語:英語  

    DOI: 10.1002/anie.201906575

  • Toward air-stable field-effect transistors with a tin iodide-based hybrid perovskite semiconductor 査読 国際誌

    Toshinori Matsushima; Shinobu Terakawa; Matthew R. Leyden; Takashi Fujihara; Chuanjiang Qin; Chihaya Adachi

    Journal of Applied Physics   125   235501   2019年6月

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    記述言語:英語  

    DOI: 10.1063/1.5097433

  • TADF activation by solvent freezing: The role of nonradiative triplet decayand spin-orbit coupling in carbazole benzonitrile derivatives 査読 国際誌

    Hosokai Takuya; Nakanotani Hajime; Santou S.; Noda Hiroki ; Nakayama Yasuo; Adachi Chihaya

    Synthetic Metals   252   62 - 68   2019年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    © 2019 Elsevier B.V. Thermally activated delayed fluorescence (TADF) materials have attracted considerable attentions as a new kind of emitters in organic light-emitting diodes. While it is requisite to minimize an energy difference between the lowest excited triplet state (T 1 ) and lowest excited singlet state (S 1 ), so-called ΔE ST , a deeper understanding of the emission mechanism is desirable to clarify the comprehensive molecular design. In this paper, we present that the TADF ability and efficiency of (rare-)metal free organic molecules are surely influenced by both the nonradiative decay of T 1 and spin-orbit coupling. By investigating a temperature dependent photoluminescence of carbazole benzonitrile derivatives in toluene solutions using a newly developed liquid nitrogen cryostat, we demonstrate the activation of TADF by solvent freezing for room temperature-TADF inactive molecules. Transient photoluminescence measurements of the frozen samples show a significant increase of a lifetime of T 1 , probing the suppression of nonradiative decay path of T 1 . A magnitude of the TADF activation by the solvent freezing is closely related to the degree of spin-orbit coupling of the molecules. The present results emphasize the importance of suppression of nonradiative decay of T 1 and an increase of spin-orbit coupling together with reducing ΔE ST to achieve a high TADF emission efficiency.

    DOI: 10.1016/j.synthmet.2019.04.005

  • A chemical structure approach enhancing light outcoupling of dopant OLEDs and internal quantum efficiency of non-dopant OLEDs having bluish TADF emitters

    Yi Ting Lee, Po Chen Tseng, Takeshi Komino, Masashi Mamada, Jiun Haw Lee, Chihaya Adachi, Chao Tsen Chen, Chin Ti Chen

    Digest of Technical Papers - SID International Symposium   50 ( Book 1 )   470 - 473   2019年5月

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    記述言語:その他   掲載種別:研究論文(その他学術会議資料等)  

    Dopant and non-dopant OLEDs were fabricated for testing four TADF emitters, having EL of blue to greenish blue color. The tetraphenyibenzene (4Ph)-containing emitters have been demonstrated having a higher light outcoupling efficiency for dopant devices and a superior IQEfor the non-dopant devices.

    DOI: 10.1002/sdtp.12958

  • Temperature dependence of the intersystem crossing rate in thermally activated delayed fluorescence emitters

    Takashi Kobayashi, Daisuke Kawase, Akitsugu Niwa, Atsumi Kayamyo, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito

    2019 COMPOUND SEMICONDUCTOR WEEK (CSW)   2019年5月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

  • Intramolecular Noncovalent Interactions Facilitate Thermally Activated Delayed Fluorescence (TADF) 査読 国際誌

    Xian-Kai Chen; Brandon W. Bakr; Morgan Auffray; Youichi Tsuchiya; C. David Sherrill; Chihaya Adachi; Jean-Luc Bredas

    The Journal of Physical Chemistry Letters   10 ( 12 )   3260 - 3268   2019年5月

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    記述言語:英語  

    DOI: 10.1021/acs.jpclett.9b01220

  • Photoluminescence Quenching Probes Spin Conversion and Exciton Dynamics in Thermally Activated Delayed Fluorescence Materials 査読 国際誌

    Brett Yurash; Hajime Nakanotani; Yoann Olivier; David Beljonne; Chihaya Adachi ; Thuc‐Quyen Nguyen

    Advanced Materials   31 ( 21 )   1804490   2019年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Fluorescent materials that efficiently convert triplet excitons into singlets through reverse intersystem crossing (RISC) rival the efficiencies of phosphorescent state-of-the-art organic light-emitting diodes. This upconversion process, a phenomenon known as thermally activated delayed fluorescence (TADF), is dictated by the rate of RISC, a material-dependent property that is challenging to determine experimentally. In this work, a new analytical model is developed which unambiguously determines the magnitude of RISC, as well as several other important photophysical parameters such as exciton diffusion coefficients and lengths, all from straightforward time-resolved photoluminescence measurements. From a detailed investigation of five TADF materials, important structure-property relationships are derived and a brominated derivative of 2,4,5,6-tetrakis(carbazol-9-yl)isophthalonitrile that has an exciton diffusion length of over 40 nm and whose excitons interconvert between the singlet and triplet states approximate to 36 times during one lifetime is identified.

    DOI: 10.1002/adma.201804490

  • Suppression of Structural Change upon S-1-T-1 Conversion Assists the Thermally Activated Delayed Fluorescence Process in Carbazole-Benzonitrile Derivatives 査読

    Saigo Masaki, Miyata Kiyoshi, Tanaka Sei'ichi, Nakanotani Hajime, Adachi Chihaya, Onda Ken

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   10 ( 10 )   2475 - 2480   2019年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Suppression of Structural Change upon S-1-T-1 Conversion Assists the Thermally Activated Delayed Fluorescence Process in Carbazole-Benzonitrile Derivatives
    Thermally activated delayed fluorescence (TADF) molecules are gathering attention for their potential to boost the efficiency of organic light-emitting diodes without precious metals. Minimizing the energy difference between the S-1 and T-1 states (Delta E-ST) is a fundamental strategy to accelerate reverse intersystem crossing (RISC). However, the lack of microscopic understanding of the process prevents adequate design strategies for efficient TADF materials. Here, we focused on four carbazole-benzonitrile (Cz-BN) derivatives that possess identical Delta E-ST but distinct TADF activities. We systematically compared their geometrical dynamics upon photo excitation using time-resolved infrared (TR-IR) vibrational spectroscopy in conjunction with quantum chemical calculations. We found that the most TADF-active molecule, 4CzBN, shows little structural change after photoexcitation, while the TADF-inactive molecules show relatively large deformation upon S-1-T-1 onversion. This implies that the suppression of structural deformation is critical for minimizing the activation energy barrier for RISC in cases of the Cz-BN derivatives.

    DOI: 10.1021/acs.jpclett.9b00810

  • Dithia[3.3]paracyclophane Core: a Versatile Platform for Fine Triplet State Tuning and Through Space TADF Emission 査読 国際誌

    Morgan Auffray; Dae Hyeon Kim; Jong Uk Kim; Fatima Bencheikh; David Kreher; Qisheng Zhang ; Anthony D’Aléo; Jean-Charles Ribierre; Fabrice Mathevet; Chihaya Adachi

    Chemistry - An Asian Journal   14 ( 11 )   1921 - 1925   2019年5月

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    記述言語:英語  

    DOI: 10.1002/asia.201900401

  • Discussion on hole traps of amorphous films of N,N'-di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (α-NPD) deposited at different substrate temperatures 査読 国際誌

    Yu Esaki; Toshinori Matsushima; Chihaya Adachi

    Applied Physics Letters   114   173301   2019年5月

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    記述言語:英語  

    DOI: 10.1063/1.5089269

  • Turn on of Sky-Blue Thermally Activated Delayed Fluorescence and Circularly Polarized Luminescence (CPL) via Increased Torsion by a Bulky Carbazolophane Donor 査読 国際誌

    Nidhi Sharma; Eduard Spuling; Cornelia M. Mattern; Wenbo Li; Olaf Fuhr; Youichi Tsuchiya; Chihaya Adachi; tefan Bräse; Ifor D. W. Samuel; Eli Zysman-Colman

    Chemical Science   10   6689 - 6696   2019年5月

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    記述言語:英語  

    DOI: 10.1039/C9SC01821B

  • Indication of current-injection lasing from an organic semiconductor 査読 国際誌

    Atula S. D. Sandanayaka; Toshinori Matsushima ; Fatima Bencheikh; Shinobu Terakawa; William J. Potscavage Jr.; Chuanjiang Qin; Takashi Fujihara; Kenichi Goushi; Jean-Charles Ribierre; Chihaya Adachi

    Applied Physics Express   12 ( 6 )   061010   2019年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this study, we investigate the lasing properties of 4,4'-bis[(N-carbazole) styryl] biphenyl thin films under electrical pumping. The electroluminescent devices incorporate a mixed-order distributed feedback SiO2 grating into an organic light-emitting diode structure and emit blue lasing. The results provide an indication of lasing by direct injection of current into an organic thin film through selection of a high-gain organic semiconductor showing clear separation of the lasing wavelength from significant triplet and polaron absorption and design of a proper feedback structure with low losses at high current densities. This study represents an important advance toward a future organic laser diode technology. (C) 2019 The Japan Society of Applied Physics

    DOI: 10.7567/1882-0786/ab1b90

  • Anisotropy of Thermal Diffusivity in Lead Halide Perovskite Layers Revealed by Thermal Grating Technique 査読 国際誌

    Patrik Scajev; Ramunas Aleksiejunas; Shinobu Terakawa; Chuanjiang Qin; Takashi Fujihara; Toshinori Matsushima; Chihaya Adachi; Saulius Jursenas

    The Journal of Physical Chemistry C   123 ( 24 )   14914 - 14920   2019年5月

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    記述言語:英語  

    DOI: 10.1021/acs.jpcc.9b02288

  • Thermally Activated Delayed Fluorescence Carbonyl Derivatives for Organic Light-Emitting Diodes with Extremely Narrow Full Width at Half-Maximum 査読

    Xing Li, Yi Zhong Shi, Kai Wang, Ming Zhang, Cai Jun Zheng, Dian Ming Sun, Gao Le Dai, Xiao Chun Fan, De Qi Wang, Wei Liu, Yan Qing Li, Jia Yu, Xue Mei Ou, Chihaya Adachi, Xiao Hong Zhang

    ACS Applied Materials and Interfaces   11 ( 14 )   13472 - 13480   2019年4月

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    記述言語:英語  

    Two novel thermally activated delayed fluorescence (TADF) emitters, 3-phenylquinolino[3,2,1-de]acridine-5,9-dione (3-PhQAD) and 7-phenylquinolino[3,2,1-de]acridine-5,9-dione (7-PhQAD), were designed and synthesized based on a rigid quinolino[3,2,1-de]acridine-5,9-dione (QAD) framework. With the effective superimposed resonance effect from electron-deficient carbonyls and electron-rich nitrogen atom, both emitters realize significant TADF characteristics with small ΔE ST s of 0.18 and 0.19 eV, respectively. And, molecular relaxations were dramatically suppressed for both emitters because of their conjugated structure. In the devices, 3-PhQAD realizes superior performance with a maximum external quantum efficiency (EQE) of 19.1&#37; and a narrow full width at half-maximum (FWHM) of 44 nm, whereas a maximum EQE of 18.7&#37; and an extremely narrow FWHM of 34 nm are realized for 7-PhQAD. These superior results reveal that apart from nitrogen and boron-aromatic systems, QAD framework can also act as a TADF matrix with effective resonance effect, and QAD derivatives are ideal candidates to develop TADF emitters with narrow FWHMs for practical applications.

    DOI: 10.1021/acsami.8b19635

  • Series of polar alcohol-additives assisted improvement in the PEDOT:PSS film property and bulk-heterojunction organic solar cell performance 査読

    Yanqiong Zheng, Junle Yu, Jie Tang, Fang Yang, Chao Wang, Bin Wei, Xifeng Li, Chihaya Adachi

    Journal of Physics D: Applied Physics   52 ( 25 )   2019年4月

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    記述言語:英語  

    Doping poly(3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) by polar solvent is a promising approach to decrease the resistivity of pristine PEDOT:PSS film. In this work, properties of doped PEDOT:PSS films by a series of alcohol additives, including ethanol, glycerol, meso-erythritol, xylitol, and D-sorbitol, are comparatively studied for the first time. The absorption spectra, surface morphology, solvent contact angle, hole mobility, work function, and carrier transport properties via Hall measurement of these doped films were systematically investigated to find out the dopant dependent PEDOT:PSS film property. Then these low-resistivity PEDOT:PSS films were applied as the hole transport layer in 20 wt&#37; poly(diketopyrro lopyrrole-terthiophene) (PDPP3T) based bulk heterojunctions (BHJs), and the highest power conversion efficiency (PCE) of 3.74&#37; was achieved for the meso-erythritol doped PEDOT:PSS based BHJ, which is 21&#37; higher than that (3.09&#37;) of the pristine PEDOT:PSS based BHJ. Finally, the performance of all six BHJs is significantly improved by using lithium fluoride instead of bathocuproine, and the PCE for the meso-erythritol doped PEDOT:PSS based BHJ achieves 4.86&#37;. Among these alcohol additives, meso-erythritol and D-sorbitol depict the optimum doping effect. Our results give important guidance to develop alcohol-additive doped PEDOT:PSS films in organic optoelectronic devices.

    DOI: 10.1088/1361-6463/ab04dc

  • Electrogenerated Chemiluminescence and Electronic States of Several Organometallic Eu(III) and Tb(III) Complexes: Effects of the Ligands

    Ryoichi Ishimatsu, Eri Kunisawa, Koji Nakano, Chihaya Adachi, Toshihiko Imato

    ChemistrySelect   4 ( 9 )   2815 - 2831   2019年3月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    We report the electrochemical properties, and electrogenerated chemiluminescence (ECL) of eight different organometallic complexes of Eu(III) and Tb(III), Eu(dbm) phen, Eu(dbm) bath, Eu(fod) phen, Eu(tta) phen, Tb(acac) phen, Tb(acac) bath, Tb(fod) phen, and Tb(tmhd) bpy in acetonitrile, where phen, bath, and bpy are 1, 10-phenanthroline, bathophenanthroline, 2,2′-bipyridyl, respectively, and the anionic ligands, acac , dbm , fod , and tta are the enolate forms of acetylacetone, dibenzoylmethanate, 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione, and thenoyltrifluoroacetone, respectively. The electronic states of the neutral and some charged states of the complexes were clarified with density functional theory calculations. The ECL spectra were recorded by using S O as a coreactant, and for all complexes, sharp ECL spectra, which are attributable to the f-f transitions, were observed. On the potential-dependent ECL spectra, broad ECLs, which were originated from the ligands, were also detected. Based on the ECL behavior and the electronic states, the mechanisms of the intraconfigurational ECL were discussed. 3 3 3 3 3 3 3 3 2 8 − − − − 2−

    DOI: 10.1002/slct.201900595

  • Fluorescence lifetime elongation of thermally activated delayed fluorescence 4CzIPN molecules with encapsulation into zeolitic imidazole frameworks ZIF-11 査読

    Harunobu Takeda, Michika Takeda, Hiroaki Yoshioka, Hiroaki Minamide, Yuji Oki, Chihaya Adachi

    Optical Materials Express   9 ( 3 )   1150 - 1160   2019年3月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    © 2019 Optical Society of America. Encapsulation of fluorescent directives "thermally activated delayed fluorescence" molecules into a zeolitic imidazole frameworks was proposed, and 4CzIPN molecules were successfully encapsulated into ZIF-11 pores by one step process with a loading efficiency of 0.064 of the proportion of 4CzIPN/ZIF-11. Some Spectroscopic studies such as XRD, UV-Vis, FTIR, THz-TDS and time resolved streak measurement, and the suppression of intramolecular vibrational, rotational and librational motions of 4CzIPN molecules were confirmed. Interestingly, the florescence lifetime of 4CzIPN was considerably elongated from 2.37 ns to 14.8 ns, while the phosphorescence lifetime became a little bit short from 2.15 μs to 1.65 μs. The lifetime differences was thought to be due to the suppression of the 4CzIPN molecules' motion by the close ZIF-11 frameworks that affected the reverse intersystem crossing.

    DOI: 10.1364/OME.9.001150

  • A solvent-free and vacuum-free melt-processing method to fabricate organic semiconducting layers with large crystal size for organic electronic applications 査読

    Ribierre Jean-Charles, Li Zhao, Liu Xiao, Lacaze Emmanuelle, Heinrich Benoit, Mery Stephane, Sleczkowski Piotr, Xiao Yiming, Lafolet Frederic, Hashizume Daisuke, Aoyama Tetsuya, Uchiyama Masanobu, Wu Jeong Weon, Zaborova Elena, Fages Frederic, D'Aleo Anthony, Mathevet Fabrice, Adachi Chihaya

    JOURNAL OF MATERIALS CHEMISTRY C   7 ( 11 )   3190 - 3198   2019年3月

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    記述言語:その他  

    A solvent-free and vacuum-free melt-processing method to fabricate organic semiconducting layers with large crystal size for organic electronic applications

    DOI: 10.1039/c8tc04834g

  • The origin of changes in electrical properties of organic films fabricated at various vacuum-deposition rates 査読 国際誌

    Amir Mikaeili; Toshinori Matsushima; Yu Esaki; Sahar Alasvand Yazdani; Chihaya Adachi; Ezeddin Mohajerani

    Optical Materials   91   93 - 100   2019年3月

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    記述言語:英語  

    DOI: 10.1016/j.optmat.2019.03.012

  • Fluorescence lifetime elongation of thermally activated delayed fluorescence 4CzIPN molecules with encapsulation into zeolitic imidazole frameworks ZIF-11 査読

    Harunobu Takeda, Michika Takeda, Hiroaki Yoshioka, Hiroaki Minamide, Yuji Oki, Chihaya Adachi

    OPTICAL MATERIALS EXPRESS   9 ( 3 )   1150 - 1160   2019年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Encapsulation of fluorescent directives "thermally activated delayed fluorescence" molecules into a zeolitic imidazole frameworks was proposed, and 4CzIPN molecules were successfully encapsulated into ZIF-11 pores by one step process with a loading efficiency of 0.064 of the proportion of 4CzIPN/ZIF-11. Some Spectroscopic studies such as XRD, UV-Vis, FTIR, THz-TDS and time resolved streak measurement, and the suppression of intramolecular vibrational, rotational and librational motions of 4CzIPN molecules were confirmed. Interestingly, the florescence lifetime of 4CzIPN was considerably elongated from 2.37 ns to 14.8 ns, while the phosphorescence lifetime became a little bit short from 2.15 mu s to 1.65 mu s. The lifetime differences was thought to be due to the suppression of the 4CzIPN molecules' motion by the close ZIF-11 frameworks that affected the reverse intersystem crossing. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

    DOI: 10.1364/OME.9.001150

  • Fabrication-method Independence of Organic Long-persistent Luminescence Performance 査読

    Kazuya Jinnai, Naohiro Nishimura, Ryota Kabe, Chihaya Adachi

    Chemistry Letters   48 ( 3 )   270   2019年3月

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    記述言語:その他  

    Fabrication-method Independence of Organic Long-persistent Luminescence Performance

    DOI: 10.1246/cl.180949

  • Effect of Carrier Balance on Device Degradation of Organic Light-Emitting Diodes based on Thermally Activated Delayed Fluorescence Emitters 査読 国際誌

    Masaki Tanaka; Hiroki Noda; Hajime Nakanotani; Chihaya Adachi

    Advanced Electronic Materials   5 ( 5 )   1800708   2019年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The relatively short device lifetime of blue organic light-emitting diodes (OLEDs) when compared with the lifetimes of green and red OLEDs is one of the crucial problems that must be overcome to enable practical application of these devices to full-color OLED displays. This work focuses on the degradation phenomena of OLEDs that are based on sky-blue thermally activated delayed fluorescence emitters and clarifies the degradation mechanisms based on spectral change of the electroluminescence, which indicates the formation of electromer emission from an electron transport layer. Additionally, it is determined that the change in the carrier balance that occurs during this degradation process can be ascribed to the formation of electron traps.

    DOI: 10.1002/aelm.201800708

  • Photostable and highly emissive glassy organic dots exhibiting thermally activated delayed fluorescence 査読

    Youichi Tsuchiya, Koudai Ikesue, Hajime Nakanotani, Chihaya Adachi

    Chemical Communications   55 ( 36 )   5215 - 5218   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic nanoparticles (O-dots) with a high photoluminescence quantum yield (94%) and long-lived delayed emission (3.1 μs) originating from thermally activated delayed fluorescence (TADF) were developed as glassy state particles using an oil in water emulsion under high pressure (<20 bar). The TADF glassy O-dots exhibit not only good dispersibility and high photostability in water but also good uptake properties into living cells. The glassy O-dots will open new uses as organic emitters in biological applications.

    DOI: 10.1039/c9cc01420a

  • Dependence of the amorphous structures and photoluminescence properties of tris(8-hydroxyquinolinato)aluminum films on vacuum deposition conditions 査読 国際誌

    Yu Esaki ; Toshinori Matsushima; Chihaya Adachi

    Organic Electronics   67   237 - 241   2019年1月

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    記述言語:英語  

    DOI: 10.1016/j.orgel.2019.01.032

  • Degradation Mechanism and Stability Improvement Strategy for an Organic Laser Gain Material 4,4′-Bis[(N-carbazole)styryl]biphenyl (BSBCz) 査読 国際誌

    Toshinori Matsushima; Seiya Yoshida; Ko Inada; Yu Esaki; Toshiya Fukunaga; Hiroyuki Mieno; Nozomi Nakamura; Fatima Bencheikh; Matthew R. Leyden; Ryutaro Komatsu; Chuanjiang Qin; Atula S. D. Sandanayaka; Chihaya Adachi

    Advanced Functional Materials   29 ( 10 )   1807148   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Abstract

    The organic material 4,4′‐bis[(N‐carbazole)styryl]biphenyl (BSBCz) is an excellent gain medium for laser devices. However, BSBCz laser output quickly degrades during photoexcitation, which is an issue that must be overcome before it can be used for practical applications. In this study, the photodegradation mechanisms of BSBCz are investigated with the aim of enhancing its excited‐state stability. The photodegradation of BSBCz is attributed to instability of the triplet excited states that would occasionally decompose into other species. This decomposition reduces absorption and introduces exciton quenchers. Incorporating the triplet managing material 9,10‐di(naphtha‐2‐yl)anthracene (ADN) into BSBCz films greatly improves photoluminescence and amplified spontaneous emission stability because of the effective removal of the unstable triplets by ADN. This triplet managing method makes it possible to increase operational stability for BSBCz‐based organic light‐emitting diodes. Therefore, these results will contribute toward the fabrication of stable optically and electrically pumped organic laser diodes.

    DOI: 10.1002/adfm.201807148

  • Distributed Feedback Lasers and Light-Emitting Diodes Using 1-Naphthylmethylamnonium Low-Dimensional Perovskite 査読 国際誌

    Matthew R. Leyden; Shinobu Terakawa; Toshinori Matsushima; Shibin Ruan; Kenichi Goushi; Morgan Auffray; Atula S. D. Sandanayaka; Chuanjiang Qin; Fatima Bencheikh; Chihaya Adachi

    ACS Photonics   6 ( 2 )   460 - 466   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    This work investigates the feasibility of using low-dimensional perovskites for electrically driven lasers given the current status of perovskite light-emitting diodes and optically pumped lasers. In our progress toward electrically driven lasers, we performed a variety of measurements on bulk and low-dimensional perovskite films to give a baseline for expectations. This included the measurement of amplified spontaneous emission, lasing, and near-infrared light-emitting diodes operated at low and high current density. We considered power density thresholds needed for amplified spontaneous emission and lasing and compared this to light-emitting diodes operated at high current density to speculate on the future of electrically driven perovskite lasers. We concluded that our current perovskite devices will need current densities of similar to 4 to 10 kA/cm(2) to achieve lasing. Future devices will most significantly benefit from architectures that accommodate higher current, but meaningful reductions in threshold may also come from improved film quality and confinement.

    DOI: 10.1021/acsphotonics.8b01413

  • Enhanced near-infrared electroluminescence from a neodymium complex in organic light-emitting diodes with a solution-processed exciplex host 査読

    Afshin Shahalizad, Dae Hyeon Kim, Sanyasi Rao Bobbara, Youichi Tsuchiya, Anthony D'Aléo, Chantal Andraud, Jean Charles Maurice Ribierre, Jean Michel Nunzi, Chihaya Adachi

    Applied Physics Letters   114 ( 3 )   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report enhanced near-infrared (NIR) electroluminescence from a Nd 3+ -complex with thenoyltrifluoroacetone and 1,10-phenanthroline ligands. The NIR-emitting complex was blended into an exciplex-forming co-host system comprising 2,7-bis(diphenylphosphoryl)-9,9′-spirobifluorene as the electron transport material and 4,4′,4″-tris(carbazol-9-yl)triphenylamine as the hole transport material in solution-processed small molecule organic light-emitting diodes (OLEDs). This binary ambipolar host system favors direct charge trapping and exciton formation on the Nd 3+ -complex molecules. Efficient energy transfer from the singlet and triplet exciplexes formed between the host molecules to the Nd 3+ ions contributes to the enhanced luminescence efficiency. The photoluminescence quantum yield of this blend is 1.2%, and the optimized OLED shows a maximum electroluminescence external quantum efficiency of 0.034%. The device also exhibits a low efficiency roll-off of only 12% over a current density range of 100 mA/cm 2 , due to the reduced triplet-polaron annihilation.

    DOI: 10.1063/1.5054721

  • Control of the dual emission from a thermally activated delayed fluorescence emitter containing phenothiazine units in organic light-emitting diodes 査読

    Ikbal Marghad, Fatima Bencheikh, Chao Wang, Sophia Manolikakes, Alice Rérat, Corinne Gosmini, Dae Hyeon Kim, Jean Charles Ribierre, Chihaya Adachi

    RSC Advances   9 ( 8 )   4336 - 4343   2019年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The development of single-component organic dual light-emitting molecules is of interest for a range of applications including white organic light-emitting diodes. Herein, a new thermally-activated delayed fluorescent molecule containing 4,6-bis-phenyl phenothiazine as donor units and 2-thiophene-1,3,5-triazine as acceptor unit was synthesized using a simple cost-effective method. This compound shows two stable molecular conformations due to the presence of the phenothiazine units in its molecular structure. These conformers exhibit different photophysical properties in both solution and thin films. The electroluminescence properties of this novel emitter were then examined in organic light-emitting diodes and the results provide useful insights into the influence of the device architecture on the dual emission characteristics. The experimental results were consistent with the optical simulations and the optimized architecture led to the fabrication of electroluminescent devices with an external quantum efficiency of 11.5% and a maximum luminance value of 10370 cd m -2 .

    DOI: 10.1039/c8ra10393c

  • Efficient and stable sky-blue delayed fluorescence organic light-emitting diodes with CIEy below 0.4 査読 国際誌

    Chin-Yiu Chan; Masaki Tanaka; Hajime Nakanotani; Chihaya Adachi

    Nature Communications   9   5036   2018年11月

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    記述言語:英語  

    DOI: 10.1038/s41467-018-07482-6

  • Highly Efficient Thermally Activated Delayed Fluorescence with Slow Reverse Intersystem Crossing 査読 国際誌

    Hiroki Noda ; Hajime Nakanotani; Chihaya Adachi

    Chemistry Letters   48 ( 2 )   126 - 129   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report an efficient luminescent molecule exhibiting thermally activated delayed fluorescence with a long-delayed fluorescence lifetime of 0.8 ms. Although the reverse intersystem crossing rate constant is small at 2.1 x 10(3) s(-1), the molecule shows a high photoluminescence quantum yield of 89 +/- 2&#37;, indicating the suppression of nonradiative decay from the triplet state.

    DOI: 10.1246/cl.180813

  • Efficient and stable sky-blue delayed fluorescence organic light-emitting diodes with CIEy below 0.4 査読 国際誌

    Chin-Yiu Chan; Masaki Tanaka; Hajime Nakanotani; Chihaya Adachi

    Nature Communications   9   5036   2018年11月

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    記述言語:英語  

    DOI: 10.1038/s41467-018-07482-6

  • Highly Efficient Thermally Activated Delayed Fluorescence with Slow Reverse Intersystem Crossing 査読 国際誌

    Hiroki Noda ; Hajime Nakanotani; Chihaya Adachi

    Chemistry Letters   48 ( 2 )   126 - 129   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report an efficient luminescent molecule exhibiting thermally activated delayed fluorescence with a long-delayed fluorescence lifetime of 0.8 ms. Although the reverse intersystem crossing rate constant is small at 2.1 x 10(3) s(-1), the molecule shows a high photoluminescence quantum yield of 89 +/- 2&#37;, indicating the suppression of nonradiative decay from the triplet state.

    DOI: 10.1246/cl.180813

  • The relation of phase transition effects and thermal stability of planar perovskite solar cells 査読 国際誌

    Chuanjiang Qin; Toshinori Matsushima; Dino Klotz; Takashi Fujihara; Chihaya Adachi

    Advanced Science   6 ( 1 )   1801079   2018年10月

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    記述言語:英語  

    DOI: 10.1002/advs.201801079

  • Computational Analysis of the Interplay between Deep Level Traps and Perovskite Solar Cell Efficiency 査読 国際誌

    Kara Kearney; Gabseok Seo; Toshinori Matsushima; Chihaya Adachi; Elif Ert; Angus Rockett

    Journal of the American Chemical Society   140 ( 46 )   15655 - 15660   2018年10月

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    記述言語:英語  

    DOI: 10.1021/jacs.8b06002

  • The relation of phase transition effects and thermal stability of planar perovskite solar cells 査読 国際誌

    Chuanjiang Qin; Toshinori Matsushima; Dino Klotz; Takashi Fujihara; Chihaya Adachi

    Advanced Science   6 ( 1 )   1801079   2018年10月

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    記述言語:英語  

    DOI: 10.1002/advs.201801079

  • Computational Analysis of the Interplay between Deep Level Traps and Perovskite Solar Cell Efficiency 査読 国際誌

    Kara Kearney; Gabseok Seo; Toshinori Matsushima; Chihaya Adachi; Elif Ert; Angus Rockett

    Journal of the American Chemical Society   140 ( 46 )   15655 - 15660   2018年10月

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    記述言語:英語  

    DOI: 10.1021/jacs.8b06002

  • Low ASE Threshold and Efficient Electroluminescence from a Carbazole Derivatized Excited State Intramolecular Proton Transfer (ESIPT) Dye 査読

    Van T, N. Mai, Atul Shukla, Masashi Mamada, Satoshi Maedera, Paul E. Shaw, Jan Sobus, Ilene Allison, Chihaya Adachi, Ebinazar B. Namdas, Shih-Chun Lo

    ACS Photonics   2018年10月

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    記述言語:その他  

    Low ASE Threshold and Efficient Electroluminescence from a Carbazole Derivatized Excited State Intramolecular Proton Transfer (ESIPT) Dye

    DOI: 10.1021/acsphotonics.8b00907

  • 【2018-9】Ultrahigh Power Efficiency Thermally Activated Delayed Fluorescent OLEDs by the Strategic Use of Electron‐Transport Materials 査読

    Sasabe,H, Sato,R, Suzuki,K, Watanabe,Y, Adachi C, Kaji, H, Kido,J

    6 ( 17 )   1800376   2018年9月

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    記述言語:英語  

    【2018-9】Ultrahigh Power Efficiency Thermally Activated Delayed Fluorescent OLEDs by the Strategic Use of Electron‐Transport Materials

    DOI: 10.1002/adom.201800376

  • Organic Long-Persistent Luminescence from a Flexible and Transparent Doped Polymer 査読

    Zesen Lin, Ryota Kabe, Naohiro Nishimura, Kazuya Jinnai, Chihaya Adachi

    Advanced Materials   1803713   2018年9月

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    Organic Long-Persistent Luminescence from a Flexible and Transparent Doped Polymer

    DOI: 10.1002/adma.201803713

  • Wide-Range Tuning and Enhancement of Organic Long-Persistent Luminescence Using Emitter Dopants 査読

    Kazuya Jinnai, Ryota Kabe, Chihaya Adachi

    Advanced Materials   1800365   2018年9月

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    Wide-Range Tuning and Enhancement of Organic Long-Persistent Luminescence Using Emitter Dopants

    DOI: 10.1002/adma.201800365

  • Enhanced Electroluminescence from Organic Light-Emitting Diodes with an Organic-Inorganic Perovskite Host Layer 査読 国際誌

    Toshinori Matsushima; Chuanjiang Qin; Kenichi Goushi; Fatima Bencheikh; Takeshi Komino; Matthew Leyden; Atula S. D. Sandanayaka; Chihaya Adachi

    Advanced Materials   30 ( 38 )   1802662   2018年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The development of host materials with high performance is essential for fabrication of efficient and stable organic light-emitting diodes (OLEDs). Although host materials used in OLEDs are typically organics, in this study, it is shown that the organic-inorganic perovskite CH3NH3PbCl3 (MAPbCl(3)) can be used as a host layer for OLEDs. Vacuum-evaporated MAPbCl(3) films have a wide band gap of about 3 eV and very high and relatively balanced hole and electron mobilities, which are suitable for the host material. Photoluminescence and electroluminescence take place through energy transfer from MAPbCl(3) to an organic emitter in films. Incorporation of an MAPbCl(3) host layer into OLEDs leads to a reduction of driving voltage and enhancement of external quantum efficiency as compared to devices with a conventional organic host layer. Additionally, OLEDs with an MAPbCl(3) host layer demonstrate very good operational stability under continuous current operation. These results can be extensively applied to organic- and perovskite-based optoelectronics.

    DOI: 10.1002/adma.201802662

  • A wide-energy-gap naphthalene-based liquid organic semiconductor host for liquid deep-blue organic light-emitting diodes 査読

    Naofumi Kobayashi, Hiroyuki Kuwae, Juro Oshima, Ryoichi Ishimatsu, Shuya Tashiro, Toshihiko Imato, Chihaya Adachi, Shuichi Shoji, Jun Mizuno

    Journal of Luminescence   200   19 - 23   2018年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We developed a novel naphthalene derivative to function as a wide-energy-gap liquid organic semiconductor (LOS) host material for the limited range of liquid deep-blue light-emitting materials that have been developed to date. The naphthalene derivative 1-naphthaleneacetic acid 2-ethylhexyl ester (NLQ), which shows a low viscosity of 20 mPa·s at 25 °C, was synthesized as a LOS by introducing an ethylhexyl group into naphthalene. We doped 9,10-diphenylanthracene (DPA) into NLQ as a guest deep-blue dye. The highest occupied molecular orbital (HOMO) energy level of NLQ was estimated to be − 6.40 eV from photoelectron spectroscopy measurements in air. The energy gap of NLQ was estimated to be 4.08 eV from its absorption spectrum, indicating that NLQ has the widest energy gap of any such host material to date. The lowest unoccupied molecular orbital energy level of NLQ was calculated to be − 2.31 eV. Deep-blue electroluminescence emission in a liquid state was obtained by doping DPA into NLQ. Light emission could be achieved by a combination of Förster resonance energy transfer and direct recombination of trapped holes and electrons because the energy gap of DPA is straddled by the wider energy gap of NLQ.

    DOI: 10.1016/j.jlumin.2018.03.072

  • Near-Infrared Electroluminescence and Low Threshold Amplified Spontaneous Emission above 800 nm from a Thermally Activated Delayed Fluorescent Emitter 査読 国際誌

    Hao Ye; Dae Hyeon Kim; Xiankai Chen; Atula S. D. Sandanayaka; Jong Uk Kim; Elena Zaborova; Gabriel Canard; Youichi Tsuchiya; Eun Young Choi; Jeong Weon Wu; Fr?d?ric Fages; Jean-Luc Bredas; Anthony D’Al?o; Jean-Charles Ribierre; Chihaya Adachi

    Chemistry of Materials   30 ( 19 )   6702 - 6710   2018年8月

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    記述言語:英語  

    DOI: 10.1021/acs.chemmater.8b02247

  • Triplet-triplet annihilation in a thermally activated delayed fluorescence emitter lightly doped in a host 査読

    Akitsugu Niwa, Shota Haseyama, Takashi Kobayashi, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito

    Applied Physics Letters   113 ( 8 )   083301   2018年8月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    © 2018 Author(s). Triplet-triplet annihilation (TTA) will change the ratio between fluorescence and phosphorescence in the photoluminescence spectrum of a thermally activated delayed fluorescence emitter at very low temperature. Using the resultant spectral blueshift, this study investigated the nature of TTA in 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) doped in a host material. The spectral blueshift is not caused by singlet-triplet annihilation and the emitter saturation effect and is less influenced by the emitter aggregates, particularly for the case of a lower doping concentration. Using these features, it is possible to focus on TTA. For 4CzIPN, the spectral blueshift due to TTA is recognized even in samples with the doping concentration as low as 1 wt. &#37;.

    DOI: 10.1063/1.5025870

  • Enhanced Electroluminescence from Organic Light-Emitting Diodes with an Organic-Inorganic Perovskite Host Layer 査読 国際誌

    Toshinori Matsushima; Chuanjiang Qin; Kenichi Goushi; Fatima Bencheikh; Takeshi Komino; Matthew Leyden; Atula S. D. Sandanayaka; Chihaya Adachi

    Advanced Materials   30 ( 38 )   1802662   2018年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The development of host materials with high performance is essential for fabrication of efficient and stable organic light-emitting diodes (OLEDs). Although host materials used in OLEDs are typically organics, in this study, it is shown that the organic-inorganic perovskite CH3NH3PbCl3 (MAPbCl(3)) can be used as a host layer for OLEDs. Vacuum-evaporated MAPbCl(3) films have a wide band gap of about 3 eV and very high and relatively balanced hole and electron mobilities, which are suitable for the host material. Photoluminescence and electroluminescence take place through energy transfer from MAPbCl(3) to an organic emitter in films. Incorporation of an MAPbCl(3) host layer into OLEDs leads to a reduction of driving voltage and enhancement of external quantum efficiency as compared to devices with a conventional organic host layer. Additionally, OLEDs with an MAPbCl(3) host layer demonstrate very good operational stability under continuous current operation. These results can be extensively applied to organic- and perovskite-based optoelectronics.

    DOI: 10.1002/adma.201802662

  • Low Amplified Spontaneous Emission Threshold from Organic Dyes Based on Bis-stilbene 査読

    Mamada Masashi, Fukunaga Toshiya, Bencheikh Fatima, Sandanayaka Atula S. D, Adachi Chihaya

    ADVANCED FUNCTIONAL MATERIALS   28 ( 32 )   2018年8月

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    Low Amplified Spontaneous Emission Threshold from Organic Dyes Based on Bis-stilbene

    DOI: 10.1002/adfm.201802130

  • Near-Infrared Electroluminescence and Low Threshold Amplified Spontaneous Emission above 800 nm from a Thermally Activated Delayed Fluorescent Emitter 査読 国際誌

    Hao Ye; Dae Hyeon Kim; Xiankai Chen; Atula S. D. Sandanayaka; Jong Uk Kim; Elena Zaborova; Gabriel Canard; Youichi Tsuchiya; Eun Young Choi; Jeong Weon Wu; Fr?d?ric Fages; Jean-Luc Bredas; Anthony D’Al?o; Jean-Charles Ribierre; Chihaya Adachi

    Chemistry of Materials   30 ( 19 )   6702 - 6710   2018年8月

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    記述言語:英語  

    DOI: 10.1021/acs.chemmater.8b02247

  • Vacuum chamber considerations for improved organic light-emitting diode lifetime 査読

    Fujimoto Hiroshi, Kobayashi Shin-ichiro, Mo Hin Wai, Yukiwaki Satoshi, Nagayoshi Kaori, Yasumatsu Mao, Harada Kentaro, Adachi Chihaya

    AIP ADVANCES   8 ( 8 )   2018年8月

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    Vacuum chamber considerations for improved organic light-emitting diode lifetime

    DOI: 10.1063/1.5047542

  • Well-ordered films of disk-shaped thermally activated delayed fluorescence (TADF) molecules 査読

    Hasegawa, Yuri, Minami, Hayato, Kanada, Satoru, Yamada, Yoichi, Sasaki, Masahiro, Hosokai, Takuya, Nakanotani, Hajime, Adachi, Chihaya

    JOURNAL OF PHOTONICS FOR ENERGY   8 ( 3 )   032110   2018年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We fabricated well-ordered, crystalline mono-and multilayers of disk-shaped thermally activated delayed fluorescence (TADF) molecules such as 4CzIPN, 2CzPN, and 5CzBN. The slow deposition of these molecules on flat substrates such as Ag(111) at room temperature resulted in the formation of well-ordered and homogeneous monolayers. Moreover, the multilayer of the 4CzIPN was also found to be well-ordered and flat when deposited on highly oriented pyrolytic graphite (HOPG). The electronic states of the crystalline monolayer and multilayer of 4CzIPN were found to be nearly the same, suggesting that the electronic states of both layers are not altered significantly by adsorption on substrates. Indeed, we also confirmed the delayed fluorescence from the crystalline multilayer of 4CzIPN on the HOPG substrate even in an ambient condition. These results show promising applications of crystalline films of disk-shaped TADF-molecules such as 4CzIPN for organic light-emitting diodes devices with high outcoupling efficiency. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)

    DOI: 10.1117/1.JPE.8.032110

  • Emission properties of thermally activated delayed fluorescence emitters: Analysis based on a four-level model considering a higher triplet excited state

    Takashi Kobayashi, Akitsugu Niwa, Shota Haseyama, Kensho Takaki, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito

    Journal of Photonics for Energy   8 ( 3 )   2018年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    © 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). A four-level model consisting of a higher triplet excited state (T2), the lowest singlet and triplet excited states (S1 and T1), and the ground state was previously used to understand emission properties of a thermally activated delayed fluorescence (TADF) emitter, 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN). In this report, we discuss the four-level model in more detail and apply to the other two TADF emitters, i.e., 1,2,4,5-tetrakis(carbazol-9-yl)-3,6-dicyanobenzene (4CzTPN) and 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN), in order to determine their excited-state structures. It is suggested that in all the emitters T2 lies between S1 and T1 and play an essential role in the emitting process. In 4CzTPN, phosphorescence from T2 is clearly observed around 100 K as in 4CzIPN. Compared to the other two emitters, 2CzPN has a wider energy gap between S1 and T1 so that delayed fluorescence at room temperature is thought to be mixed with phosphorescence. Because of this mixing, the spectrum characteristic of phosphorescence from T2 in 2CzPN cannot be identified.

    DOI: 10.1117/1.JPE.8.032104

  • The Importance of Excited-State Energy Alignment for Efficient Exciplex Systems Based on a Study of Phenylpyridinato Boron Derivatives. 査読

    Mamada M, Tian G, Nakanotani H, Su J, Adachi C

    Angewandte Chemie (International ed. in English)   2018年7月

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    The Importance of Excited-State Energy Alignment for Efficient Exciplex Systems Based on a Study of Phenylpyridinato Boron Derivatives.

    DOI: 10.1002/anie.201804218

  • Solvent-dependent investigation of carbazole benzonitrile derivatives Does the le 3 - CT 1 energy gap facilitate thermally activated delayed fluorescence? 査読

    Takuya Hosokai, Hiroki Noda, Hajime Nakanotani, Takanori Nawata, Yasuo Nakayama, Hiroyuki Matsuzaki, Chihaya Adachi

    Journal of Photonics for Energy   8 ( 3 )   2018年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The photophysical properties of six types of carbazole benzonitrile (CzBN) derivatives are investigated in different solvents to examine the thermally activated delayed fluorescence (TADF) activation via reducing the energy gap between the singlet charge-transfer and triplet locally excited states, ΔEST(LE). Relative to the ΔEST(LE) values for the CzBN derivatives in the low polarity solvent toluene (ϵ∼2), a reduction of ΔEST(LE) for the CzBN derivatives in the polar solvent acetonitrile (ϵ∼37) was confirmed while maintaining fairly constant ΔEST values. Notably, TADF activation was observed in acetonitrile for some CzBN derivatives that are TADF inactive in toluene. A numerical analysis of various rate constants revealed the cause of TADF activation as an increase in the reverse intersystem crossing rate and a suppression of the non-radiative decay rate of the triplet states. The positive effect of ΔEST(LE) was limited, however, as an excessive decrease in ΔEST(LE) facilitates the nonradiative deactivation of the triplet states, leading to a loss of the TADF efficiency. This paper shows that ΔEST(LE) provides a measure of TADF activation and that appropriate regulation of ΔEST(LE) is required to achieve high TADF efficiency.

    DOI: 10.1117/1.JPE.8.032102

  • Diffusion Enhancement in Highly Excited MAPbI3 Perovskite Layers with Additives 査読

    Patrik Ščajev, Chuanjiang Qin, Ramunas Aleksiejunas, Paulius Baronas, Saulius Miasojedovas, Takashi Fujihara, Toshinori Matsushima, Chihaya Adachi, Saulius Juršėnas

    Journal of Physical Chemistry Letters   9 ( 12 )   3167 - 3172   2018年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Carrier mobility is one of the crucial parameters determining the electronic device performance. We apply the light-induced transient grating technique to measure independently the carrier diffusion coefficient and lifetime, and to reveal the impact of additives on carrier transport properties in wet-cast CH3NH3PbI3 (MAPbI3) perovskite films. We use the high excitation regime, where diffusion length of carriers is controlled purely by carrier diffusion and not by the lifetime. We demonstrate a four-fold increase in diffusion coefficient due to the reduction of localization center density by additives
    however, the density dependence analysis shows the dominance of localization-limited diffusion regime. The presented approach allows us to estimate the limits of technological improvement - carrier diffusion coefficient in wet-cast layers can be expected to be enhanced by up to one order of magnitude.

    DOI: 10.1021/acs.jpclett.8b01155

  • Simultaneous Edge-on to Face-on Reorientation and 1D Alignment of Small pi-Conjugated Molecules Using Room-Temperature Mechanical Rubbing 査読

    Ribierre Jean-Charles, Tanaka Toshihiko, Zhao Li, Yokota Yuki, Matsumoto Shinya, Hashizume Daisuke, Takaishi Kazuto, Muto Tsuyoshi, Heinrich Benoit, Mery Stephane, Mathevet Fabrice, Matsushima Toshinori, Uchiyama Masanobu, Adachi Chihaya, Aoyama Tetsuya

    Advanced Functional Materials   28 ( 19 )   2018年5月

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    Simultaneous Edge-on to Face-on Reorientation and 1D Alignment of Small pi-Conjugated Molecules Using Room-Temperature Mechanical Rubbing

    DOI: 10.1002/adfm.201707038

  • 2018-5】Observation of Spontaneous Orientation Polarization in Evaporated Films of Organic Light-Emitting Diode Materials 査読

    Osada K, Goushi K, Kaji H, Adachi C, Ishii H, Noguchi Y

    58   313 - 317   2018年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    【2018-5】Observation of Spontaneous Orientation Polarization in Evaporated Films of Organic Light-Emitting Diode Materials
    The molecular orientation in organic semiconductor films determines device performances. In particular, the spontaneous orientation of a permanent dipole moment (PDM) along the surface normal direction induces a polarization charge at the hetero-interfaces of stacked multilayer devices, and the interface charge dominates the charge accumulation and injection properties. Spontaneous orientation polarization (SOP) has been observed in the "randomly oriented" films of several organic semiconductor materials, and is potentially inherent in many common materials. Herein, we report that 11 additional molecules of organic light-emitting diode materials, including thermally activated delayed fluorescence emitters, and horizontally oriented emitters and electron transporters, exhibit SOP in their evaporated films. The experimental results clearly indicate that SOP frequently occurs in "horizontally oriented" films as well as "randomly oriented" films. The factors contributing to SOP formation are discussed in terms of the figure of merit per PDM. We found that strong intermolecular interactions tend to reduce the figure of merit. Moreover, we suggest the impact of SOP on device performances.

    DOI: 10.1016/j.orgel.2018.04.026

  • Grain Boundary Engineering of Halide Perovskite CH3NH3PbI3 Solar Cells with Photochemically Active Additives 査読

    Nastaran Faraji, Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi, Jan Seidel

    Journal of Physical Chemistry C   122 ( 9 )   4817 - 4821   2018年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this study, we investigate the nanoscale effects of photochemically active additives of benzoquinone (BQ), hydroquinone (HQ), and tetracyanoquinodimethane (TCNQ) on grain boundaries in CH3NH3PbI3 solar cells. We employ scanning probe microscopy under light illumination, in particular Kelvin probe force microscopy, to study surface potential changes under laser light illumination. The recently found improvement in the efficiency of BQ added solar cells can be clearly seen in vanishing contact potential differences at grain boundaries under illumination, rendering the material more uniform under solar cell operating conditions. These effects are observed for BQ, but not for HQ and TCNQ. Our findings shed light onto halide perovskite materials and the functional additive design for improved solar cell performance.

    DOI: 10.1021/acs.jpcc.8b00804

  • Rational Molecular Design for Deep-Blue Thermally Activated Delayed Fluorescence Emitters 査読

    Chin-Yiu Chan, Lin-Song Cui, Jong Uk Kim, Hajime Nakanotani, Chihaya Adachi

    Advanced Functional Materials   28 ( 11 )   2018年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    By simple modification of the functional groups on the donor unit, the thermally activated delayed fluorescence (TADF) properties of emitters can easily be manipulated. A series of deep blue to blue emissive TADF derivatives is developed, capable of deep-blue emissions from 403 to 460 nm in toluene. Deep-blue organic light-emitting diodes (OLEDs) based on this series of TADF emitters are fabricated, resulting in an electroluminescence peak at 428 nm and a high external quantum efficiency of up to 10.3&#37;. One deep-blue OLED has achieved the commission internationale de l'eclairage (CIE) coordinates of (0.156, 0.063), which is among the best reported TADF performances for deep-blue OLEDs with CIEy &lt
    0.07.

    DOI: 10.1002/adfm.201706023

  • High-efficiency electroluminescence and amplified spontaneous emission from a thermally activated delayed fluorescent near-infrared emitter 査読

    Dae-Hyeon Kim, Anthony D'Aléo, Xian-Kai Chen, Atula D. S. Sandanayaka, Dandan Yao, Li Zhao, Takeshi Komino, Elena Zaborova, Gabriel Canard, Youichi Tsuchiya, Eunyoung Choi, Jeong Weon Wu, Frédéric Fages, Jean-Luc Brédas, Jean-Charles Ribierre, Chihaya Adachi

    Nature Photonics   12 ( 2 )   98 - 104   2018年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Near-infrared organic light-emitting diodes and semiconductor lasers could benefit a variety of applications including night-vision displays, sensors and information-secured displays. Organic dyes can generate electroluminescence efficiently at visible wavelengths, but organic light-emitting diodes are still underperforming in the near-infrared region. Here, we report thermally activated delayed fluorescent organic light-emitting diodes that operate at near-infrared wavelengths with a maximum external quantum efficiency of nearly 10&#37; using a boron difluoride curcuminoid derivative. As well as an effective upconversion from triplet to singlet excited states due to the non-adiabatic coupling effect, this donor-acceptor-donor compound also exhibits efficient amplified spontaneous emission. By controlling the polarity of the active medium, the maximum emission wavelength of the electroluminescence spectrum can be tuned from 700 to 780 nm. This study represents an important advance in near-infrared organic light-emitting diodes and the design of alternative molecular architectures for photonic applications based on thermally activated delayed fluorescence.

    DOI: 10.1038/s41566-017-0087-y

  • Well-Ordered 4CzIPN ((4s,6s)-2,4,5,6-Tetra(9-H-carbazol-9-yl)isophthalonitrile) Layers: Molecular Orientation, Electronic Structure, and Angular Distribution of Photoluminescence 査読

    Y. Hasegawa, Y. Yamada, M. Sasaki, T. Hosokai, H. Nakanotani, C. Adachi

    Journal of Physical Chemistry Letters   9 ( 4 )   863 - 867   2018年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We fabricated a well-ordered homogeneous monolayer of disk-shaped, carbazolyl dicyanobenzene (CDCB)-based thermally activated delayed fluorescence (TADF) molecule, i.e., 4CzIPN((4s,6s)-2,4,5,6-tetra(9Hcarbazol-9-yl)isophthalonitrile) at room temperature on flat Ag(111), Au(111), and Cu(111) surfaces. The second layer of the 4CzIPN was also found to be well ordered. The electronic states of the well-ordered monolayer and multilayer of 4CzIPN were found to be nearly unchanged from that of the isolated molecule calculated by the density functional theory (DFT), suggesting that the ordered layers retain the TADF properties. Indeed, we demonstrated the delayed fluorescence and the nearly perfect in-plane alignment of the transition dipole moment of a 4CzIPN thin film on glass substrate even in an ambient condition. These results indicate that the well-ordered films of the disc-shaped carbazole-based TADF molecules could potentially be utilized in organic light-emitting diode (OLED) devices with high light outcoupling efficiency.

    DOI: 10.1021/acs.jpclett.7b03232

  • Thermally activated delayed fluorescence of a Zr-based metal–organic framework

    H. Mieno, R. Kabe, M. D. Allendorf, C. Adachi

    Chemical Communications   54 ( 6 )   631 - 634   2018年1月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    <p>The first metal–organic framework exhibiting thermally activated delayed fluorescence (TADF) was developed.</p>

    DOI: 10.1039/c7cc08595h

  • Reversible control of triplet dynamics in metal-organic framework-entrapped organic emitters via external gases 査読 国際誌

    Hiroyuki Mieno; Ryota Kabe; Chihaya Adachi

    Communications Chemistry   1   27   2018年1月

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    記述言語:英語  

    DOI: 10.1038/s42004-018-0027-x

  • Low-Threshold Light Amplification in Bifluorene Single Crystals: Role of the Trap States 査読

    Paulius Baronas, Gediminas Kreiza, Povilas Adomenas, Ona Adomeniene, Karolis Kazlauskas, Jean-Charles Ribierre, Chihaya Adachi, Saulius Juršenas

    ACS Applied Materials and Interfaces   10 ( 3 )   2768 - 2775   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic single crystals (SCs) expressing long-range periodicity and dense molecular packing are an attractive amplifying medium for the realization of electrically driven organic lasers. However, the amplified spontaneous emission (ASE) threshold (1-10 kW/cm2) of SCs is still significantly higher compared to those of amorphous neat or doped films. The current study addresses this issue by investigating ASE properties of rigid bridging group-containing bifluorene SCs. Introduction of the rigid bridges in bifluorenes enables considerable reduction of nonradiative decay, which, along with enhanced fluorescence quantum yield (72-82&#37;) and short excited state lifetime (1.5-2.5 ns), results in high radiative decay rates (0.5 × 109 s-1) of the SCs, making them highly attractive for lasing applications. The revealed ASE threshold of 400 W/cm2 in acetylene-bridged bifluorene SCs is found to be among the lowest ever reported for organic crystals. Ultrafast transient absorption spectroscopy enabled one to disclose pronounced differences in the excited state dynamics of the studied SCs, pointing out the essential role of radiative traps in achieving a record low ASE threshold. Although the origin of the trap states was not completely unveiled, the obtained results clearly evidence that the crystal doping approach can be successful in achieving extremely low ASE thresholds required for electrically pumped organic laser.

    DOI: 10.1021/acsami.7b14702

  • Deep-Red Amplified Spontaneous Emission from cis-Configured Squaraine 査読

    Hao Ye, Linsong Cui, Toshinori Matsushima, Chuanjiang Qin, Chihaya Adachi

    ACS Applied Materials and Interfaces   10 ( 1 )   27 - 31   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report deep-red amplified spontaneous emission (ASE) from cis-configured squaraine (cis-DCSQ1) under optical pumping. Doping of cis-DCSQ1 into a 4,4′-bis(9-carbazolyl)-2,2′-biphenyl (CBP) host film at an appropriate concentration (0.5 wt &#37; for this system) led to a marked increase of photoluminescence quantum yield because of efficient CBP-to-cis-DCSQ1 Förster resonance energy transfer and suppression of aggregation-caused quenching. Thus, this doped film showed clear ASE with a threshold of around 10 μJ cm-2 and peak wavelength of 687 nm. These results proved that cis-configured squaraine derivatives are promising as gain materials for future applications as deep-red organic lasers.

    DOI: 10.1021/acsami.7b15562

  • Exciton diffusion in bifluorene single crystals studied by light induced transient grating technique 査読

    Paulius Baronas, Patrik Ščajev, Vladislavas Cerkasovas, Gediminas Kreiza, Povilas Adomenas, Ona Adomeniene, Karolis Kazlauskas, Chihaya Adachi, Saulius Juršenas

    Applied Physics Letters   112 ( 3 )   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Exciton diffusion is considered to be of prime importance for controlling the recombination zone in organic light emitting devices. This is particularly relevant for organic lasers based on single crystals, where undesirable exciton-exciton annihilation at high concentrations is inevitable. Here, exciton diffusion is studied in bifluorene single crystals specifically designed for organic laser applications, therefore featuring exceptionally low threshold of light amplification. The non-destructive light induced transient grating (LITG) technique capable of simultaneously evaluating the exciton lifetime and diffusion coefficient along different directions of the crystal was employed for this study. Highly anisotropic singlet exciton diffusion with the diffusion coefficient varying from &lt
    0.05 up to 0.96 cm2/s (in a perpendicular direction) and the corresponding diffusion lengths changing from &lt
    60 up to 300 nm, respectively, was revealed in ethylene-bridged bifluorene crystals. The LITG results on the directionality of exciton diffusion are anticipated to be essential for devising single crystal based organic lasers.

    DOI: 10.1063/1.5008376

  • The role of fluorine-substitution on the π-bridge in constructing effective thermally activated delayed fluorescence molecules 査読

    Yun Li, Jiao Jiao Liang, Hong Cheng Li, Lin Song Cui, Man Keung Fung, Stephen Barlow, Seth R. Marder, Chihaya Adachi, Zuo Quan Jiang, Liang Sheng Liao

    Journal of Materials Chemistry C   6 ( 20 )   5536 - 5541   2018年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Two thermally activated delayed fluorescence (TADF) emitters 9′-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-2-fluorophenyl)-9′H-9,3′:6′,9′′-tercarbazole (TCTZ-F) and 9′-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-2,6-difluorophenyl)-9′H-9,3′:6′,9′′-tercarbazole (TCTZ-2F) were synthesized and compared to the previously reported molecule 9′-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9′H-9,3′:6′,9′′-tercarbazole (TCTZ) to explore the possible effects of the fluorine atom(s) on the molecular conformation, electronic coupling between the donor and acceptor groups, and consequently the photophysical behavior of the emitters. Specifically, the TCTZ-F molecule was calculated to have a smaller dihedral angle than TCTZ-2F and a smaller S1-T1 gap than TCTZ, which led it to have the highest photoluminescence quantum yield (PLQY) among this series of compounds. An OLED fabricated with TCTZ-F as the emitter achieved the highest external quantum efficiencies (22.5%) of this series, indicating that fluorination can play a useful role in TADF emitters.

    DOI: 10.1039/c8tc01158c

  • Influence of vacuum chamber impurities on OLED degradation 査読

    Hiroshi Fujimoto, Takashi Suekane, Katsuya Imanishi, Satoshi Yukiwaki, Hong Wei, Kaori Nagayoshi, Masayuki Yahiro, Chihaya Adachi

    Digest of Technical Papers - SID International Symposium   48 ( 1 )   9 - 12   2017年12月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We evaluated the influence of impurities in the vacuum chamber used for device fabrication on the lifetime ofOLEDs and found a correlation between lifetime and the device fabrication time. Our results suggest that impurities including previously deposited materials and plasticizers from the chamber components impact lifetime and reproducibility.

    DOI: 10.1002/sdtp.11560

  • Long-lived efficient delayed fluorescence organic light-emitting diodes using n-type hosts 査読

    Lin-Song Cui, Shi-Bin Ruan, Fatima Bencheikh, Ryo Nagata, Lei Zhang, Ko Inada, Hajime Nakanotani, Liang-Sheng Liao, Chihaya Adachi

    NATURE COMMUNICATIONS   8   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic light-emitting diodes have become a mainstream display technology because of their desirable features. Third-generation electroluminescent devices that emit light through a mechanism called thermally activated delayed fluorescence are currently garnering much attention. However, unsatisfactory device stability is still an unresolved issue in this field. Here we demonstrate that electron-transporting n-type hosts, which typically include an acceptor moiety in their chemical structure, have the intrinsic ability to balance the charge fluxes and broaden the recombination zone in delayed fluorescence organic electroluminescent devices, while at the same time preventing the formation of high-energy excitons. The n-type hosts lengthen the lifetimes of green and blue delayed fluorescence devices by > 30 and 1000 times, respectively. Our results indicate that n-type hosts are suitable to realize stable delayed fluorescence organic electroluminescent devices.

    DOI: 10.1038/s41467-017-02419-x

  • A New Design Strategy for Efficient Thermally Activated Delayed Fluorescence Organic Emitters: From Twisted to Planar Structures 査読

    Xian-Kai Chen, Youichi Tsuchiya, Yuma Ishikawa, Cheng Zhong, Chihaya Adachi, Jean-Luc Bredas

    ADVANCED MATERIALS   29 ( 46 )   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In the traditional molecular design of thermally activated delayed fluorescence (TADF) emitters composed of electron-donor and electron-acceptor moieties, achieving a small singlet-triplet energy gap (Delta E-ST) in strongly twisted structures usually translates into a small fluorescence oscillator strength, which can significantly decrease the emission quantum yield and limit efficiency in organic light-emitting diode devices. Here, based on the results of quantum-chemical calculations on TADF emitters composed of carbazole donor and 2,4,6-triphenyl-1,3,5-triazine acceptor moieties, a new strategy is proposed for the molecular design of efficient TADF emitters that combine a small Delta E-ST with a large fluorescence oscillator strength. Since this strategy goes beyond the traditional framework of structurally twisted, charge-transfer type emitters, importantly, it opens the way for coplanar molecules to be efficient TADF emitters. Here, a new emitter, composed of azatriangulene and diphenyltriazine moieties, is theoretically designed, which is coplanar due to intramolecular H-bonding interactions. The synthesis of this hexamethylazatriangulene-triazine (HMAT-TRZ) emitter and its preliminary photophysical characterizations point to HMAT-TRZ as a potential efficient TADF emitter.

    DOI: 10.1002/adma.201702767

  • Enhanced Electrical Properties and Air Stability of Amorphous Organic Thin Films by Engineering Film Density 査読

    Yu Esaki, Takeshi Komino, Toshinori Matsushima, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   8 ( 23 )   5891 - 5897   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The influences of film density and molecular orientation on the carrier conduction and air stability of vacuum-deposited amorphous organic films of N,N'-di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (alpha-NPD) were investigated. The substrate temperature (T-sub) during vacuum deposition had different effects on the film density and molecular orientation of alpha-NPD. Film density was a concave function of T-sub; maximum density was attained at T-sub, = 270-300 K. alpha-NPD molecules were randomly oriented at T-sub, = 342 K, and their horizontal orientation on the substrate became dominant as T-sub:, decreased. Hole current and air stability were clearly raised by increasing the film density by 1 to 2&#37;; these effects were, respectively, attributed to carrier hopping between neighboring alpha-NPD molecules and suppressed penetration of oxygen and water. These results imply that increasing film density is more effective to enhance the electrical performance of organic thin-film devices with alpha-NPD films than control of molecular orientation.

    DOI: 10.1021/acs.jpclett.7b02808

  • Donor-sigma-Acceptor Motifs: Thermally Activated Delayed Fluorescence Emitters with Dual Upconversion 査読

    Yan Geng, Anthony D'Aleo, Ko Inada, Lin-Song Cui, Jong Uk Kim, Hajime Nakanotani, Chihaya Adachi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   56 ( 52 )   16536 - 16540   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A family of organic emitters with a donor-sigma-acceptor (D-sigma-A) motif is presented. Owing to the weakly coupled D-sigma-A intramolecular charge-transfer state, a transition from the localized excited triplet state ((LE)-L-3) and charge-transfer triplet state ((CT)-C-3) to the charge-transfer singlet state ((CT)-C-1) occurred with a small activation energy and high photoluminescence quantum efficiency. Two thermally activated delayed fluorescence (TADF) components were identified, one of which has a very short lifetime of 200-400 ns and the other a longer TADF lifetime of the order of microseconds. In particular, the two D-sigma-A materials presented strong blue emission with TADF properties in toluene. These results will shed light on the molecular design of new TADF emitters with short delayed lifetimes.

    DOI: 10.1002/anie.201708876

  • Control of the Singlet–Triplet Energy Gap in a Thermally Activated Delayed Fluorescence Emitter by Using a Polar Host Matrix 査読

    Shota Haseyama, Akitsugu Niwa, Takashi Kobayashi, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito

    Nanoscale Research Letters   12 ( 1 )   268   2017年12月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    © 2017, The Author(s). The photoluminescence properties of a thermally activated delayed fluorescence emitter, 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN), doped in a host matrix consisting of 1,3-bis(9-carbazolyl)benzene and a polar inert molecule, camphoric anhydride (CA), in various concentrations have been investigated. It is found that the addition of CA stabilizes only the lowest singlet excited state (S1) of 2CzPN without changing the energy level of the lowest triplet excited state (T1), leading to a reduction in the energy gap between S1and T1. The maximum reduction of energy gap achieved in this work has been determined to be around 65 meV from the shift of the fluorescence spectrum and the temperature dependence of the photoluminescence decay rate.

    DOI: 10.1186/s11671-017-2012-1

  • Centrifugal-Coated Quasi-Two-Dimensional Perovskite CsPb2Br5 Films for Efficient and Stable Light-Emitting Diodes 査読

    Chuanjiang Qin, Toshinori Matsushima, Atula S. D. Sandanayaka, Youichi Tsuchiya, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   8 ( 21 )   5415 - 5421   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The optical, structural, and electroluminescent (EL) characteristics of pure quasi-2D CsPb2Br5 were reported. We fabricated continuous, compact, well-crystallized CsPb2Br5 films by centrifugal coating from a colloidal solution containing CsPb2Br5 nanoparticles. The centrifugal-coated CsPb2Br5 films have a photoluminescence quantum yield (PLQY) of similar to 35&#37; because of its low-dimensional structure. Taking advantage of the high PLQY, we fabricated perovskite light-emitting diodes (PeLEDs) with a centrifugal coated CsPb2Br5 emitting layer exhibiting bright green EL, a maximum luminance of 7317 cd m(-2), an and external quantum efficiency of 1.1&#37;. Additionally, the EL color could be changed easily from green to red using a halogen exchange method. The half lifetime of our CsPb2Br5 PeLEDs reached around 6 h under continuous operation at 10 mA cm(-2).

    DOI: 10.1021/acs.jpclett.7b02371

  • Diindenoperylene (DIP) concentration dependent photovoltaic performance and dielectric properties for mixed heterojunctions 査読

    Yan Qiong Zheng, Chao Wang, Jun Le Yu, Fang Yang, Bin Wei, Yang Lin, Xi Feng, Chihaya Adachi

    SYNTHETIC METALS   233   35 - 40   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To find some intrinsic relevance between the photovoltaic performance and dielectric properties of diindenoperylene (DIP) mixed heterojunctions (MHJs), this work demonstrates both the photovoltaic performance and dielectric characteristic dependence on the DIP concentration. 5 wt&#37;-DIP MHJ shows relatively higher performance compared to other MHJs with higher DIP ratio over the range of 5 wt&#37;-90 wt&#37;. The dielectric constant of blend layers decreases with the DIP ratio, thus results in larger Coulomb capture radius and exciton binding energy, which suppresses the exciton dissociation in MHJs with high DIP ratio. Then, the dielectric characteristic of capacitance-voltage (C-V) in dark and under illumination as well as of capacitance-frequency (C-f)at dc bias of 1.6 V for the DIP MHJs were measured. The geometric capacitance of the MHJs extracted from the C-V in dark indicates a positive dependence on the DIP concentration. C-V peak height decreases with the DIP concentration from 0 to 60 wt&#37; implies that the hole drift becomes dominated at higher DIP content. The open circuit voltage (V-oc) of all the MHJs shows an identical trend with the normalized built-in potential. In dark condition, depletion width (W) gradually decreases with the DIP concentration from 5 wt&#37; to 60 wt&#37;. W becomes narrower under illumination, ascribed to the increased capacitance from photo-generated charge. The free carrier density (N-D) imposes a negative influence on fill factor of MHJs. The extracted electron mobility by C-f characteristic gradually decreases with the DIP ratio.

    DOI: 10.1016/j.synthmet.2017.09.001

  • Electrogenerated Chemiluminescence of a BODIPY Derivative with Extended Conjugation 査読

    Ryoichi Ishimatsu, Hirosato Shintaku, Chihaya Adachi, Koji Nakano, Toshihiko Imato

    CHEMISTRYSELECT   2 ( 32 )   10531 - 10536   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The electrochemical properties and electrogenerated chemiluminescence (ECL) of a borondipyrromethane (BODIPY) derivative, 2,8-bis(4-isopropylphenyl)-difuro[2,3-b][3,2-g]-5,5-difluoro-5-bora-3a,4a-diaza-s-indacene (Derivative 1, Figure) are described. Derivative 1 emitted ECL in the range of 650 similar to 800nm by using tripropylamine (TPA) as a coreactant. In the cyclic voltammogram, Derivative 1 showed a reversible oxidation wave, whereas the reduction wave was irreversible. Energetically, it is likely that triplet-triplet annihilation is the main pathway to emit ECL through the ion annihilation of the radical anions and cations of Derivative 1 whereas the lowest excited singlet state of Derivative 1 is directly produced with TPA. The maximum ECL wavelengths (670nm at 0.01mM) were red-shifted with increasing the concentration of Derivative 1 because of the self-absorption resulted from a small Stokes shift (similar to 10nm). Relative ECL efficiency of Derivative 1 was 0.13 compared to that of a Ru(bpy)(2+)/TPA system.

    DOI: 10.1002/slct.201702449

  • Organic long persistent luminescence 査読

    Ryota Kabe, Chihaya Adachi

    Nature   550 ( 7676 )   384 - 387   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Long persistent luminescence (LPL) materials - widely commercialized as 'glow-in-the-dark' paints - store excitation energy in excited states that slowly release this energy as light. At present, most LPL materials are based on an inorganic system of strontium aluminium oxide (SrAl 2 O 4) doped with europium and dysprosium, and exhibit emission for more than ten hours. However, this system requires rare elements and temperatures higher than 1,000 degrees Celsius during fabrication, and light scattering by SrAl 2 O 4 powders limits the transparency of LPL paints. Here we show that an organic LPL (OLPL) system of two simple organic molecules that is free from rare elements and easy to fabricate can generate emission that lasts for more than one hour at room temperature. Previous organic systems, which were based on two-photon ionization, required high excitation intensities and low temperatures. By contrast, our OLPL system - which is based on emission from excited complexes (exciplexes) upon the recombination of long-lived charge-separated states - can be excited by a standard white LED light source and generate long emission even at temperatures above 100 degrees Celsius. This OLPL system is transparent, soluble, and potentially flexible and colour-tunable, opening new applications for LPL in large-area and flexible paints, biomarkers, fabrics, and windows. Moreover, the study of long-lived charge separation in this system should advance understanding of a wide variety of organic semiconductor devices.

    DOI: 10.1038/nature24010

  • Thermally activated delayed fluorescence of Bis(9,9-dimethy1-9,10-dihydroacridine) dibenzo [b,d]thiophene 5,5-dioxide derivatives for organic light-emitting diodes 査読

    Jong Uk Kim, Saripally Sudhaker Reddy, Lin-Song Cui, Hiroko Nomura, Sunbin Hwang, Dae Hyeon Kim, Hajime Nakanotani, Sung-Ho Jin, Chihaya Adachi

    JOURNAL OF LUMINESCENCE   190   485 - 491   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Two luminescent dibenzo [b,d] thiophene 5,5-dioxide derivatives combined with 9,9-dimethyl-9,10-dihydroacridine were synthesized and the appearance of thermally activated delayed fluorescence was confirmed. Both 3,7- and 2,8-bis(9,9-dimethy1-9,10-dihydroacridine)dibenzo [b,d]thiophene 5,5-dioxide (3ASOA) and (4ASOA) showed prompt and delayed fluorescence with high total photoluminescence (PL) quantum efficiencies of 72&#37; and 88&#37; in their doped films, respectively. The maximum external electroluminescence (EL) efficiencies of 13.8&#37; in 4ASOA and 10.4&#37; in 3ASOA were obtained. Further, 4ASOA showed slightly relaxed rolloff behavior, indicating that 2,8-substitution of the donors appreciably improved both PL and EL characteristics.

    DOI: 10.1016/j.jlumin.2017.06.006

  • Confinement of Long-Lived Triplet Excitons in Organic Semiconducting Host-Guest Systems 査読

    Naoto Notsuka, Ryota Kabe, Kenichi Goushi, Chihaya Adachi

    Advanced Functional Materials   27 ( 40 )   1703902   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Confinement of Long-Lived Triplet Excitons in Organic Semiconducting Host-Guest Systems
    Long-lived triplet excitons on organic molecules easily deactivate at room temperature because of the presence of thermally activated nonradiative pathways. This study demonstrates long-lived phosphorescence at room temperature resulting from suppression of the nonradiative deactivation of triplet excitons in conventional organic semiconducting host-guest systems. The nonradiative deactivation pathway strongly depends on the triplet energy gap between the guest emitting molecules and the host matrices. The triplet energy gap required to confine the long-lived triplet excitons (approximate to 0.5 eV) is much larger than that of conventional host-guest systems for phosphorescent emitters. By effectively confining the triplet excitons, this study demonstrates long-lived room-temperature phosphorescence under optical and electrical excitation.

    DOI: 10.1002/adfm.201703902

  • Molecular Design for Blue Thermal Activated Delayed Fluorescence Materials: Substitution Position Effect 査読

    Yan Geng, Lin-Song Cui, Jong Uk Kim, Hajime Nakanotani, Chihaya Adachi

    CHEMISTRY LETTERS   46 ( 10 )   1490 - 1492   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Three emitters having a donor-phenyl-acceptor structure are considered as thermally activated delayed fluorescence (TADF) materials. They present different triplet excited-state energies depending on the substitution positions. Consequently, two materials exhibit blue emission with TADF properties. The OLEDs based on o-CzXTN provided a maximum EQE as high as 10.6&#37;.

    DOI: 10.1246/cl.170587

  • Two Regimes of Carrier Diffusion in Vapor-Deposited Lead-Halide Perovskites 査読

    Patrik Scajev, Ramunas Aleksiejunas, Saulius Miasojedovas, Saulius Nargelas, Munetomo Inoue, Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi, Saulius Jursenas

    JOURNAL OF PHYSICAL CHEMISTRY C   121 ( 39 )   21600 - 21609   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Metal halide perovskites are attractive materials for the realization of cheap and effective solar cells, thin film transistors, and light emitters. Carrier diffusion at high excitations, however, is poorly addressed in perovskites, even though it governs the diffusion length and determines the efficiency of photonic devices. To fully understand the dependence of diffusion length on carrier density, we performed direct and independent measurements of the carrier diffusion coefficient and recombination rate in several methylammonium lead halide perovskite layers by applying the light-induced transient grating technique. We demonstrate the existence of two distinct carrier diffusion regimes within the density range of 10(18)-10(20) cm(-3). In the perovskite films of high compositional quality, diffusion is governed by a bandlike transport of free carriers. The diffusivity is high (0.28-0.7 cm(2)/s) in these samples, even at low carrier density, and further increases with excitation due to carrier degeneracy. The opposite scenario was observed in disordered perovskite layers, where diffusion is governed by hopping-like transport of localized carriers. The diffusion coefficient in latter layers is small (0.01-0.04 cm(2)/s at low densities) and increases with excitation due to local state filling and carrier delocalization. We show that carrier recombination can be well-described using the nonlinear radiative and nonradiative recombination coefficients that saturate with excitation due to phase space filling at high carrier densities. On the basis of these findings, we provide recommendations for the maximization of carrier diffusion length in different perovskites.

    DOI: 10.1021/acs.jpcc.7b04179

  • 熱活性型遅延蛍光(TADF)分子の配向制御と電子状態評価

    山田, 洋一, 長谷川, 友里, 細貝, 拓也, 中野谷, 一, 安達, 千波矢, Enrique, Ortega

    表面科学学術講演会要旨集   37 ( 0 )   3 - 3   2017年8月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    熱活性型遅延蛍光(TADF)は、三重項励起子を熱励起により一重項励起子に逆項間交差させることで、内部量子効率100&#37;の蛍光発光を可能にする。この分子を用いたデバイスの外部量子効率を向上させるため、配向制御により遷移双極子モーメントを揃えることで、光取出効率を向上させることが重要である。我々は、この分子の配向制御を達成し、さらに配向膜の電子状態が孤立分子と同様であることを示した。

    DOI: 10.14886/sssj2008.37.0_3

  • TADF分子膜の配向制御及び発光特性計測

    南, 颯人, 佐々木, 正洋, 山田, 洋一, 細貝, 拓也, 中野谷, 一, 安達, 千波矢, 長谷川, 友里

    表面科学学術講演会要旨集   37 ( 0 )   212 - 212   2017年8月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    熱活性遅延蛍光分子は、緻密な分子設計によって内部量子効率100&#37;を実現することが知られている。高効率の有機ELデバイス実現のためには、高い内部量子効率の維持が重要であると考える。我々は金属基板上でいくつかのTADF分子について高配向の単分子膜を形成し、STMにより構造解析を行った。また、過渡発光計測の結果、TADF分子の一種である4CzIPNは遅延蛍光の発光効率が膜厚に依存することを見出した。

    DOI: 10.14886/sssj2008.37.0_212

  • 【2017-12】Solution-processable thermally activated delayed fluorescence emitters for application in organic light emitting diodes 査読

    Suzuki, K, Adachi, C, Kaji, H

    J. Soc. Inf. Disp.   25 ( 8 )   480 - 485   2017年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Solution-processable thermally activated delayed fluorescence emitters for application in organic light emitting diodes
    Solution-processed organic light emitting diodes (OLEDs) have been fabricated using the thermally activated delayed fluorescence (TADF) emitter, DACT-II, and its soluble derivative, tBu-DACT-II, as emitting dopants. DACT-II reportedly exhibits very high external quantum efficiencies (EQEs) in vacuum-processed OLEDs. The solution-processed DACT-II-based and tBu-DACT-II-based OLEDs exhibited external quantum efficiency exceeding the theoretical upper limit of classical fluorescent OLEDs.

    DOI: 10.1002/jsid.598

  • Dipole orientation analysis without optical simulation: application to thermally activated delayed fluorescence emitters doped in host matrix 査読

    Takeshi Komino, Yuji Oki, Chihaya Adachi

    SCIENTIFIC REPORTS   7   2017年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The dipole orientation of guest emitters doped into host matrices is usually investigated by angular dependent photoluminescence (PL) measurements, which acquire an out-of-plane PL radiation pattern of the guest-host thin films. The PL radiation patterns generated by these methods are typically analysed by optical simulations, which require expertise to perform and interpret in the simulation. In this paper, we developed a method to calculate an orientational order parameter S without the use of full optical simulations. The PL radiation pattern showed a peak intensity (I-sp) in the emission direction tilted by 40 degrees-60 degrees from the normal of the thin film surface plane, indicating an inherent dipole orientation of the emitter. Thus, we directly correlated I-sp with S. The S - I-sp relation was found to depend on the film thickness (d) and refractive indices of the substrate (n(sub)) and the organic thin film (n(org)). Hence, S can be simply calculated with information of I-sp, d, n(sub), and n(org). We applied our method to thermally activated delayed fluorescence materials, which are known to be highly efficient electroluminescence emitters. We evaluated S and found that the error of this method, compared with an optical simulation, was less than 0.05.

    DOI: 10.1038/s41598-017-08708-1

  • Near-infrared organic light-emitting diodes for biosensing with high operating stability 査読

    Takahiko Yamanaka, Hajime Nakanotani, Shigeo Hara, Toru Hirohata, Chihaya Adachi

    APPLIED PHYSICS EXPRESS   10 ( 7 )   2017年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate highly stable NIR organic light-emitting diodes (OLEDs) based on a system using excitonic energy transfer from thermally activated delay fluorescence molecules to NIR fluorophores. The NIR OLEDs showed an electroluminescence peak at 780nm and robust operational stability with 2&#37; loss of the initial radiant flux after 1000 h under a constant current density of 10mA/cm(2). The variation of hemoglobin oxygen saturation can be detected using the NIR OLEDs as a light source. (C) 2017 The Japan Society of Applied Physics

    DOI: 10.7567/APEX.10.074101

  • Increasing the horizontal orientation of transition dipole moments in solution processed small molecular emitters 査読

    Alessia Senes, Stefan C. J. Meskers, Horst Greiner, Katsuaki Suzuki, Hironori Kaji, Chihaya Adachi, Joanne S. Wilson, Rene A. J. Janssen

    JOURNAL OF MATERIALS CHEMISTRY C   5 ( 26 )   6555 - 6562   2017年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The efficiency of organic light emitting diodes (OLEDs) can be improved by controlling the orientation of the transition dipole moment of the emitters. Currently, no effective methods exist for orienting the transition dipole moments in solution processed active layers for OLEDs. We investigate the orientation of the transition dipole moment of small molecular emitters in a host matrix of poly(9,9-dioctylfluorene) (PFO) by means of angle dependent luminescence intensity measurements. The polymer chains of the host orient predominantly in the plane of the film. Fluorescent p-phenylenevinylene oligomers with 6 and 7 repeat units (OPV6, OPV7) are found to also orient preferentially horizontally. The orientation of the emitters can be improved by thermal annealing with up to 90&#37; of transition dipole moments oriented in the plane of the film. The phosphorescent emitter Ir(MDQ)(2)(acac) shows a degree of horizontal orientation in the polymeric host matrix lower than that which is observed for oligomers, but as high as is observed for the same emitter in evaporated layers. A carbazole derivative capable of thermally activated delayed fluorescence shows a small preference for vertical orientation within the polymer host. The strong orientation of OPV6 and OPV7 in the oriented polymer host is rationalized in terms of their high aspect ratios. The use of PFO as host material in host/guest systems allows achieving horizontal orientation of transition dipole moments in solution processed oligomers and small molecular emitters.

    DOI: 10.1039/c7tc01568b

  • Highly Efficient Thermally Activated Delayed Fluorescence from an Excited-State Intramolecular Proton Transfer System 査読

    Masashi Mamada, Ko Inada, Takeshi Komino, William J. Potscavage, Hajime Nakanotani, Chihaya Adachi

    ACS CENTRAL SCIENCE   3 ( 7 )   769 - 777   2017年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermally activated delayed fluorescence (TADF)
    [GRAPHIC]
    materials have shown great potential for highly efficient organic light-emitting diodes (OLEDs). While the current molecular design of TADF materials primarily focuses on combining donor and acceptor units, we present a novel system based on the use of excited-state intramolecular proton transfer (ESIPT) to achieve efficient TADF without relying on the well-established donor-acceptor scheme. In an appropriately designed acridone-based compound with intramolecular hydrogen bonding, ESIPT leads to separation of the highest occupied and lowest unoccupied molecular orbitals, resulting in TADF emission with a photoluminescence quantum yield of nearly 60&#37;. High external electroluminescence quantum efficiencies of up to 14&#37; in OLEDs using this emitter prove that efficient triplet harvesting is possible with ESIPT-based TADF materials. This work will expand and accelerate the development of a wide variety of TADF materials for high performance OLEDs.

    DOI: 10.1021/acscentsci.7b00183

  • Methylammonium Lead Bromide Perovskite Light-Emitting Diodes by Chemical Vapor Deposition 査読

    Matthew R. Leyden, Lingqiang Meng, Yan Jiang, Luis K. Ono, Longbin Qiu, Emilio J. Juarez-Perez, Chuanjiang Qin, Chihaya Adachi, Yabing Qi

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   8 ( 14 )   3193 - 3198   2017年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organo-lead-halide perovskites are promising materials for optoelectronic applications. Perovskite solar cells have reached power conversion efficiencies of over 22&#37;, and perovskite light-emitting diodes have recently achieved over 11&#37; external quantum efficiency. To date, most research on perovskite light-emitting diodes has focused on solution-processed films. There are many advantages of a vapor-based growth process to prepare perovskites, including ease of patterning, ability to batch process, and material compatibility. We investigated an all-vapor perovskite growth process by chemical vapor deposition and demonstrated luminance up to 560 cd/m(2).

    DOI: 10.1021/acs.jpclett.7b01093

  • Boron difluoride hemicurcuminoid as an efficient far red to near-infrared emitter: toward OLEDs and laser dyes 査読

    A. D'Aleo, M. H. Sazzad, D. H. Kim, E. Y. Choi, J. W. Wu, G. Canard, F. Fages, J. -C. Ribierre, C. Adachi

    CHEMICAL COMMUNICATIONS   53 ( 52 )   7003 - 7006   2017年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A hemicurcuminoid boron difluoride complex is used as an emitter in organic light-emitting diodes, showing far red/near-infrared electroluminescence with an external quantum efficiency as high as 2.1&#37;. This dye blended in CBP thin films shows amplified spontaneous emission with a threshold of 22 mu J cm(-2) at 750 nm, making this compound attractive for organic semiconductor lasers operating in the near-infrared region.

    DOI: 10.1039/c7cc01786c

  • THz Absorption Measurement and Calculation of Organic Thermally Activated Delayed Fluorescence Materials 査読

    Harunobu Takeda, Cong Chen, Takeshi Komino, Hiroaki Yoshioka, Yuji Oki, Chihaya Adachi

    2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)   Part F82-CLEO_Europe 2017   2017年6月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

  • Influence of the organic film thickness on the second order distributed feedback resonator properties of an organic semiconductor laser 査読

    F. Bencheikh, A. S. D. Sandanayaka, T. Matsushima, J. C. Ribierre, C. Adachi

    JOURNAL OF APPLIED PHYSICS   121 ( 23 )   2017年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report on the cavity numerical characterization of a second order one-dimensional distributed feedback organic laser. The gain medium containing 6wt. &#37; of 4,4'bis[(N-carbazole) styryl] biphenyl) in a 4,4;-bis[9-dicarbazolyl]-2,2'-biphenyl) host is vacuum deposited to form an organic thin film on a SiO2 grating. The influence of the organic film thickness on the properties of the resonant cavity is investigated through numerical calculations of both the confinement factor Gamma and the Q-factor. The Q-factor is obtained using two methods, one by calculating the eigenmodes of the resonant cavity and the other by calculating the reflection spectrum. It was found that while the Gamma increases with the organic film thickness, the Q-factor shows a non-monotonic function with a maximum value for a thickness of 200 nm. Published by AIP Publishing.

    DOI: 10.1063/1.4986504

  • Nature of the singlet and triplet excitations mediating thermally activated delayed fluorescence 査読 国際誌

    Y. Olivier; B. Yurash; L. Muccioli; G. D’Avino; O. Mikhnenko; J. C. Sancho-García; C. Adachi; T.-Q. Nguyen; D. Beljonne

    Physical Review Materials   1   075602   2017年5月

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    記述言語:英語  

    DOI: 10.1103/PhysRevMaterials.1.075602

  • Joule heat-induced breakdown of organic thin-film devices under pulse operation 査読 国際誌

    Kou Yoshida; Toshinori Matsushima; Yu Shiihara; Hiroyuki Kuwae; Jun Mizuno; Chihaya Adachi

    J. Appl. Phys.   121   195503   2017年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/1.4983456

  • Evidence and mechanism of efficient thermally activated delayed fluorescence promoted by delocalized excited states 査読

    Takuya Hosokai, Hiroyuki Matsuzaki, Hajime Nakanotani, Katsumi Tokumaru, Tetsuo Tsutsui, Akihiro Furube, Keirou Nasu, Hiroko Nomura, Masayuki Yahiro, Chihaya Adachi

    SCIENCE ADVANCES   3 ( 5 )   2017年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The design of organic compounds with nearly no gap between the first excited singlet (S-1) and triplet (T-1) states has been demonstrated to result in an efficient spin-flip transition from the T-1 to S-1 state, that is, reverse intersystem crossing (RISC), and facilitate light emission as thermally activated delayed fluorescence (TADF). However, many TADF molecules have shown that a relatively appreciable energy difference between the S-1 and T-1 states (similar to 0.2 eV) could also result in a high RISC rate. We revealed from a comprehensive study of optical properties of TADF molecules that the formation of delocalized states is the key to efficient RISC and identified a chemical template for these materials. In addition, simple structural confinement further enhances RISC by suppressing structural relaxation in the triplet states. Our findings aid in designing advanced organic molecules with a high rate of RISC and, thus, achieving the maximum theoretical electroluminescence efficiency in organic light-emitting diodes.

    DOI: 10.1126/sciadv.1603282

  • Near infrared electroluminescence from Nd(TTA)(3) phen in solution-processed small molecule organic light-emitting diodes 査読

    Afshin Shahalizad, Anthony D'Aleo, Chantal Andraud, Muhammad Hasnan Sazzad, Dae-Hyeon Kim, Youichi Tsuchiya, Jean-Charles Ribierre, Jean-Michel Nunzi, Chihaya Adachi

    ORGANIC ELECTRONICS   44   50 - 58   2017年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report on the near infrared electroluminescence properties of a Nd3+ complex with thenoyltri-fluoroacetone and 1,10-phenantroline ligands in solution-processed organic light-emitting diodes. Spincoated blends containing a 1,3-bis(9-carbazolyl) benzene host doped with the Nd3+ complex were found to exhibit a photoluminescence quantum yield of about 0.5&#37;, regardless of the doping concentration level. Electroluminescent devices based on these small molecule blends showed the characteristic emission of Nd3+ at 890, 1060 and 1330 nm with an external quantum efficiency as high as 0.022&#37;. These improved performances were mainly attributed to direct charge trapping and exciton formation on the near infrared emitter. Importantly, the efficiency roll-off at high current densities due to triplet-triplet exciton annihilation in the device containing 20 wt&#37; of the complex was lower than what is typically observed in lanthanide complex-based electroluminescent devices. This is presumably due to the high triplet energy of the host material, which prevents guest-to-host energy-back transfer and thus host-guest triplet-triplet exciton annihilation. (C) 2017 Elsevier B. V.

    DOI: 10.1016/j.orgel.2017.01.044

  • Light Amplification in Molecules Exhibiting Thermally Activated Delayed Fluorescence 査読

    Hajime Nakanotani, Taro Furukawa, Takuya Hosokai, Takuji Hatakeyama, Chihaya Adachi

    Advanced Optical Materials   5 ( 12 )   1700051 - 1700051   2017年5月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    Light Amplification in Molecules Exhibiting Thermally Activated Delayed Fluorescence

    DOI: 10.1002/adom.201700051

  • A near-infrared organic light-emitting diode based on an Yb(III) complex synthesized by vacuum co-deposition 査読

    Kazuya Jinnai, Ryota Kabe, Chihaya Adachi

    CHEMICAL COMMUNICATIONS   53 ( 39 )   5457 - 5460   2017年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Yb(DBM)(3)(DPEPO), an emitter, was directly synthesized on a substrate by the vacuum co-deposition of the precursor Yb(DBM)(3)(H2O)(2) and the ligand DPEPO. OLEDs incorporating the co-deposited emitting layer (Yb(DBM)(3)(H2O)(2) : DPEPO molar ratio = 1 : 1) achieved an eta(EQE) value of 0.15&#37; at 1.0 mA cm(-2).

    DOI: 10.1039/c7cc01580a

  • Joule heat-induced breakdown of organic thin-film devices under pulse operation 査読 国際誌

    Kou Yoshida; Toshinori Matsushima; Yu Shiihara; Hiroyuki Kuwae; Jun Mizuno; Chihaya Adachi

    J. Appl. Phys.   121   195503   2017年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/1.4983456

  • Control of the Singlet-Triplet Energy Gap in a Thermally Activated Delayed Fluorescence Emitter by Using a Polar Host Matrix 査読

    Shota Haseyama, Akitsugu Niwa, Takashi Kobayashi, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito

    NANOSCALE RESEARCH LETTERS   12   2017年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The photoluminescence properties of a thermally activated delayed fluorescence emitter, 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN), doped in a host matrix consisting of 1,3-bis(9-carbazolyl) benzene and a polar inert molecule, camphoric anhydride (CA), in various concentrations have been investigated. It is found that the addition of CA stabilizes only the lowest singlet excited state (S-1) of 2CzPN without changing the energy level of the lowest triplet excited state (T-1), leading to a reduction in the energy gap between S-1 and T-1. The maximum reduction of energy gap achieved in this work has been determined to be around 65 meV from the shift of the fluorescence spectrum and the temperature dependence of the photoluminescence decay rate.

    DOI: 10.1186/s11671-017-2012-1

  • Toward continuous-wave operation of organic semiconductor lasers 査読

    Atula S. D. Sandanayaka, Toshinori Matsushima, Fatima Bencheikh, Kou Yoshida, Munetomo Inoue, Takashi Fujihara, Kenichi Goushi, Jean-Charles Ribierre, Chihaya Adachi

    SCIENCE ADVANCES   3 ( 4 )   2017年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The demonstration of continuous-wave lasing from organic semiconductor films is highly desirable for practical applications in the areas of spectroscopy, data communication, and sensing, but it still remains a challenging objective. We report low-threshold surface-emitting organic distributed feedback lasers operating in the quasicontinuous-wave regime at 80 MHz as well as under long-pulse photoexcitation of 30 ms. This outstanding performance was achieved using an organic semiconductor thin film with high optical gain, high photoluminescence quantum yield, and no triplet absorption losses at the lasing wavelength combined with a mixed-order distributed feedback grating to achieve a low lasing threshold. A simple encapsulation technique greatly reduced the laser-induced thermal degradation and suppressed the ablation of the gain medium otherwise taking place under intense continuous-wave photoexcitation. Overall, this study provides evidence that the development of a continuous-wave organic semiconductor laser technology is possible via the engineering of the gain medium and the device architecture.

    DOI: 10.1126/sciadv.1602570

  • Bifluorene Single Crystals with Extremely Low-Threshold Amplified Spontaneous Emission 査読

    Gediminas Kreiza, Paulius Baronas, Edvinas Radiunas, Povilas Adomenas, Ona Adomeniene, Karolis Kazlauskas, Jean-Charles Ribierre, Chihaya Adachi, Saulius Jursenas

    ADVANCED OPTICAL MATERIALS   5 ( 5 )   2017年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic single crystals offering numerous advantages due to their long-range molecular order are considered a promising gain medium for realization of electrically-pumped organic lasers provided their amplified spontaneous emission (ASE) threshold is sufficiently low. Unfortunately, ASE thresholds of such crystals are typically more than one order of magnitude higher (in the range of tens of kW cm(-2)) as compared to those of amorphous neat/doped films. Here, this issue is addressed by rationally designing bifluorene-based compounds to express weak intermolecular coupling in the crystalline phase. The twisted molecular backbone as well as out-of-plane twisted dimethyl moieties attached at the fluorene end-groups additionally benefit with enhanced electron-vibronic coupling resulting in a large Stokes shift (0.5 eV) and reduced reabsorption of emission. Endowed with such features the bifluorenes exhibit similarly high radiative decay rates (approximate to 1.5 x 10(9) s(-1)) when doped in polystyrene matrix at low concentrations and in sublimation-grown single crystals. The high radiative rates accompanied by excellent waveguiding properties, favorable orientation of transition dipole moments as well as non-overlapping excited-state absorption and gain regions enable achieving extremely low ASE thresholds (approximate to 700 W cm(-2)) in the bifluorene single crystals. The achieved low threshold encourages employment of rationally designed molecules in organic crystals for lasing applications.

    DOI: 10.1002/adom.201600823

  • Contributions of a Higher Triplet Excited State to the Emission Properties of a Thermally Activated Delayed-Fluorescence Emitter 査読

    Takashi Kobayashi, Akitsugu Niwa, Kensho Takaki, Shota Haseyama, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito

    PHYSICAL REVIEW APPLIED   7 ( 3 )   2017年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The temperature dependences of photoluminescence (PL) decay rates and the PL spectrum of a thermally activated delayed-fluorescence emitter, 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN), are investigated. It is found that not only the lowest singlet (S-1) and triplet ( T-1) excited states but also an additional triplet excited state ( T-n) lying between S-1 and T-1 play an important role in the exciton decay process, particularly around 100 K. At around this temperature, some of the triplet excitons are thermally activated into Tn but not up to S-1, and they then decay into the ground state (S-0) with phosphorescence emission. Therefore, two kinds of phosphorescence, originating from T-n and T-1, are observed. The temperature dependence of the PL decay rates of 4CzIPN can be explained by a four-level model consisting of S-1, T-1, T-n, and S-0, and its energy gaps between T-n and T-1 and between S-1 and T-1 are determined to be 45 +/- 5 meV and 135 +/- 10 meV, respectively.

    DOI: 10.1103/PhysRevApplied.7.034002

  • 【2017-3】Combined Inter- and Intramolecular Charge-Transfer Processes for Highly Efficient Fluorescent Organic Light-Emitting Diodes with Reduced Triplet Exciton Quenching 査読

    Moon, C, Suzuki, K, Shizu, K, Adachi, C, Kaji, H, Kim, J

    Adv. Mater.   29 ( 17 )   [1606448-1] - [1606448-5]   2017年3月

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    記述言語:英語  

    【2017-3】Combined Inter- and Intramolecular Charge-Transfer Processes for Highly Efficient Fluorescent Organic Light-Emitting Diodes with Reduced Triplet Exciton Quenching

    DOI: 10.1002/adma.201606448

  • Deep-blue light emission with a wide-bandgap naphthalene-derivative liquid organic semiconductor host 査読

    Naofumi Kobayashi, Hiroyuki Kuwae, Juro Oshima, Ryoichi Ishimatsu, Shuya Tashiro, Toshihiko Imato, Chihaya Adachi, Shuichi Shoji, Jun Mizuno

    ORGANIC PHOTONIC MATERIALS AND DEVICES XIX   10101   2017年2月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We developed a novel naphthalene-derivative to function as a wide-bandgap liquid organic semiconductor (LOS) host material for the limited range of liquid deep-blue light-emitting materials that have been developed to date. The naphthalene-derivative, 1-naphthaleneacetic acid 2-ethylhexyl ester (NLQ) was synthesized as a LOS, by introducing an ethylhexyl group into naphthalene. 9,10-Diphenyl anthracene (DPA) was doped into NLQ as a guest deep-blue dye. From the absorption spectrum, the bandgap energy of NLQ was estimated to be 4.13 eV, indicating that NLQ has the widest bandgap energy of any such host material so far as we know. Deep-blue electroluminescence (EL) emission in a liquid state was obtained by doping DPA into NLQ. Light emission could be achieved by a combination of Forster resonance energy transfer and direct recombination of trapped holes and electrons because the bandgap energy of DPA is straddle by that of the wide-bandgap NLQ. Thus, NLQ is shown to be a promising wide-bandgap LOS host material, which allows deep-blue light emission and may have applications in liquid organic light-emitting diodes.

    DOI: 10.1117/12.2251640

  • Intrinsic carrier transport properties of solution-processed organic-inorganic perovskite films 査読

    Toshinori Matsushima, Sunbin Hwang, Shinobu Terakawa, Takashi Fujihara, Atula S. D. Sandanayaka, Chuanjiang Qin, Chihaya Adachi

    APPLIED PHYSICS EXPRESS   10 ( 2 )   2017年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The true performance of field-effect transistors with spin-coated organic-inorganic perovskite (C6H5C2H4NH3)(2)Snl(4) semiconductor layers remains unknown because of the presence of contact resistance ( RC). To evaluate the intrinsic carrier mobility (mu), we fabricated perovskite transistors with large channel lengths (L). The field-effect mu gradually increased with increasing L and then became constant in the large-L region, because of the reduced contribution of RC relative to the total resistance. The intrinsic mu values estimated from this region reached 26 and 4.8 cm(2)V(-1) s(-1) for holes and electrons, respectively, which are the highest ever reported in any perovskite transistor. (C) 2017 The Japan Society of Applied Physics

    DOI: 10.7567/APEX.10.024103

  • Near-Infrared Electrophosphorescence up to 1.1 µm using a Thermally Activated Delayed Fluorescence Molecule as Triplet Sensitizer. 査読

    Nagata R, Nakanotani H, Adachi C

    Advanced materials (Deerfield Beach, Fla.)   29 ( 5 )   2017年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Near-Infrared Electrophosphorescence up to 1.1 mu m using a Thermally Activated Delayed Fluorescence Molecule as Triplet Sensitizer
    A tenfold improvement in the external electroluminescence quantum efficiency of NIR electrophosphorescence is demonstrated compared to devices with conventional fluorescent materials as host, by applying the concept of thermally activated delayed fluorescence to achieve an emitter layer capable of efficient spin conversion. This device architecture can maximize the performance of an organicsemiconductor-based NIR light source.

    DOI: 10.1002/adma.201604265

  • Controlling Singlet-Triplet Energy Splitting for Deep-Blue Thermally Activated Delayed Fluorescence Emitters 査読

    Lin-Song Cui, Hiroko Nomura, Yan Geng, Jong Uk Kim, Hajime Nakanotani, Chihaya Adachi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   56 ( 6 )   1571 - 1575   2017年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The development of efficient metal-free organic emitters with thermally activated delayed fluorescence (TADF) properties for deep-blue emission is still challenging. A new family of deep-blue TADF emitters based on a donor-acceptor architecture has been developed. The electronic interaction between donor and acceptor plays a key role in the TADF mechanism. Deep-blue OLEDs fabricated with these TADF emitters achieved high external quantum efficiencies over 19.2&#37; with CIE coordinates of (0.148, 0.098).

    DOI: 10.1002/anie.201609459

  • Organic light emitting diodes with horizontally oriented thermally activated delayed fluorescence emitters 査読

    D. H. Kim, K. Inada, L. Zhao, T. Komino, N. Matsumoto, J. C. Ribierre, C. Adachi

    JOURNAL OF MATERIALS CHEMISTRY C   5 ( 5 )   1216 - 1223   2017年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Horizontal orientation of the emission transition dipole of light-emitting molecules plays a critical role in the light outcoupling efficiency and the performance of organic light-emitting diodes. It is well established that linear and planar small molecules are generally preferred to achieve such a horizontal molecular orientation in vapor-deposited organic thin films. Here, we designed and synthesized four novel carbazole-based thermally-activated delayed fluorescence (TADF) molecules with different shapes and degrees of planarity in order to examine the influence of the emitter structure on the molecular orientation and the electroluminescence properties in TADF OLEDs. Molecular orientation of the TADF molecules in neat films and in blends was investigated using variable angle spectroscopic ellipsometry and angle dependent photoluminescence measurements, respectively. The results provide new important insights into the influence of the planarity of TADF molecules on their molecular orientation in vapor-deposited organic thin films. The photophysical and electroluminescence properties of these TADF molecules were then investigated to examine the influence of the molecular orientation on the performance of TADF OLEDs. The most efficient device was obtained using the TADF emitter showing a nearly perfect horizontal orientation of the emitting dipoles in the blend films. The maximum electroluminescence external quantum efficiency measured in this device was found to be 15.4&#37;, which is about 1.75 times higher than the theoretical value calculated using an isotropic distribution of transition dipoles.

    DOI: 10.1039/c6tc04786f

  • Fabrication of high coverage MASnI(3) perovskite films for stable, planar heterojunction solar cells 査読

    T. Fujihara, S. Terakawa, T. Matsushima, C. Qin, M. Yahiro, C. Adachi

    JOURNAL OF MATERIALS CHEMISTRY C   5 ( 5 )   1121 - 1127   2017年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The development of lead-free organic-inorganic perovskite absorbers for solar cells is an important step toward commercializing this technology. Tin halide perovskites are a proposed alternative to lead perovskites; however, their performances show high levels of instability owing to the low quality of these perovskite films. In this work, we used a modified solvent bathing method to fabricate tin halide perovskite films. To control the formation speed of the perovskite films, we combined anti-solvents with miscibilities different to those of the precursor solvent in an appropriate ratio and at an appropriate temperature. Thus, we were able to significantly improve the coverage of the perovskite films. A planar perovskite solar cell with a film prepared using this method showed an efficiency of 2.14 +/- 0.35&#37; with an open circuit voltage of 0.45 +/- 0.01 V, which is higher than that of solar cells with a conventionally prepared active layer. Additionally, we achieved a significant reproducibility in performance in comparison with previously reported devices. Further, the solar cells had unexpectedly long lifetimes of over 200 h under 1 Sun degradation conditions (AM1.5, 100 mW cm(-2)); generally, tin perovskites degrade quickly. We propose that the comparably high open circuit voltage and stable photovoltaic properties of our tin halide perovskite solar cells is the result of the high surface coverage of the perovskite film, which was achieved using the modified solvent bathing method.

    DOI: 10.1039/c6tc05069g

  • Current understanding of mechanism of thermally activated delayed fluorescence: RISC beyond S-T energy gap

    Takuya Hosokai, Hiroyuki Matsuzaki, Hajime Nakanotani, Chihaya Adachi

    Proceedings of the International Display Workshops   1   690 - 693   2017年1月

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    記述言語:その他   掲載種別:研究論文(その他学術会議資料等)  

    © 2017 Proceedings of the International Display Workshops. All rights reserved. A mechanism of thermally activated delayed fluorescence (TADF) beyond the ordinary discussion of reverse intersystem crossing (RISC) determined by the energy gap between excited singlet (Si) and triplet (Ti) states is introduced. A new design strategy of highly efficient TADF materials will also be proposed.

  • Extremely low amplified spontaneous emission threshold and blue electroluminescence from a spin-coated octafluorene neat film 査読

    D. -H. Kim, A. S. D. Sandanayaka, L. Zhao, D. Pitrat, J. C. Mulatier, T. Matsushima, C. Andraud, J. C. Ribierre, C. Adachi

    APPLIED PHYSICS LETTERS   110 ( 2 )   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report on the photophysical, amplified spontaneous emission (ASE), and electroluminescence properties of a blue-emitting octafluorene derivative in spin-coated films. The neat film shows an extremely low ASE threshold of 90 nJ/cm(2), which is related to its high photoluminescence quantum yield of 87&#37; and its large radiative decay rate of 1.7 x 10(9) s(-1). Low-threshold organic distributed feedback semiconductor lasers and fluorescent organic light-emitting diodes with a maximum external quantum efficiency as high as 4.4&#37; are then demonstrated, providing evidence that this octafluorene derivative is a promising candidate for organic laser applications. Published by AIP Publishing.

    DOI: 10.1063/1.4974045

  • Strong luminescence behavior of mono- and dimeric imidazoquinazolines: Swift OLED degradation under electrical current 査読

    Rampal Pandey, Gabor Mehes, Ashish Kumar, Roop Shikha Singh, Amit Kumar, Chihaya Adachi, Daya Shankar Pandey

    JOURNAL OF LUMINESCENCE   181   252 - 260   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Design and synthesis of novel mono-and dimeric quinazoline derivatives (+)-6-methyl-6-pyridin-2-yl-5,6-dihydrobenzo[4,5]imidazo[1,2-c]quinazoline (1) and (+)-6-[(6-methyl-5,6-dihydrobenzo-[4,5]imidazo [1,2-c] quinazolin-6-yl)-pyridin-2-yl]-6-methyl-5,6-dihydro-benzo-[4,5]imidazo-[1,2-c] quinazoline (2) have been described. Both 1 and 2 have been characterized by elemental analyses, FT-IR, H-1 and C-13 NMR, HRMS spectroscopic studies and their structures authenticated by X-ray single crystal analyses. Photophysical properties of these compounds have been studied by UV/VIS absorption and fluorescence spectroscopy and transient photoluminescence analysis in solution, powder, and non-doped (neat) and doped vacuum-deposited films. A broad emission spectrum spanning most of the visible range and good thermal stability indicated promising application of 1 and 2 as OLED emitters. Unfortunately, under current flow we observed rapid device degradation, presumably to be related to free -NH moiety in these compounds. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jlumin.2016.09.026

  • Multifunctional Benzoquinone Additive for Efficient and Stable Planar Perovskite Solar Cells 査読

    Chuanjiang Qin, Toshinori Matsushima, Takashi Fujihara, Chihaya Adachi

    ADVANCED MATERIALS   29 ( 4 )   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Device stability of planar perovskite solar cells is improved by virtue of multifunctional BQ additive. The morphology and crystal quality of the perovskite films are improved because BQ slows the rate of perovskite crystal formation. Electron transfer from perovskite to BQ reduces charge-recombination losses, and the oxidizing ability of BQ effectively suppresses the formation of metallic lead and improves device lifetime.

    DOI: 10.1002/adma.201603808

  • Versatile Molecular Functionalization for Inhibiting Concentration Quenching of Thermally Activated Delayed Fluorescence 査読

    Jiyoung Lee, Naoya Aizawa, Masaki Numata, Chihaya Adachi, Takuma Yasuda

    ADVANCED MATERIALS   29 ( 4 )   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Concentration quenching of thermally activated delayed fluorescence is found to be dominated by electron-exchange interactions, as described by the Dexter energy-transfer model. Owing to the short-range nature of the electronexchange interactions, even a small modulation in the molecular geometric structure drastically affects the concentration- quenching, leading to enhanced solid-state photoluminescence and electroluminescence quantum efficiencies.

    DOI: 10.1002/adma.201604856

  • Tetrathienoanthracene-based pi-Extended Narrow-band-gap Molecules: Synthesis, Physicochemical, and Photovoltaic Properties 査読

    Hideaki Komiyama, Chihaya Adachi, Takuma Yasuda

    CHEMISTRY LETTERS   46 ( 1 )   29 - 31   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    New acceptor-donor-acceptor-structured pi-extended narrow-band-gap molecules based on tetrathienoanthracene were designed and synthesized. Organic solar cells based on bulk-heterojunction blends of these molecules with PC61BM showed high open-circuit voltages of up to 0.97V.

    DOI: 10.1246/cl.160858

  • Fabrication of high coverage MASnI3 perovskite films for stable, planar heterojunction solar cells 査読 国際誌

    T. Fujihara; S. Terakawa; T. Matsushima; C. Qin; M. Yahiro; C. Adachi

    J. Mater. Chem. C   5   1121 - 1127   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C6TC05069G

  • Solution-Processed Organic-Inorganic Perovskite Field-Effect Transistors with High Hole Mobilities 査読

    Toshinori Matsushima, Sunbin Hwang, Atula S. D. Sandanayaka, Chuanjiang Qin, Shinobu Terakawa, Takashi Fujihara, Masayuki Yahiro, Chihaya Adachi

    ADVANCED MATERIALS   28 ( 46 )   10275 - 10281   2016年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A very high hole mobility of 15 cm(2) V-1 s(-1) along with negligible hysteresis are demonstrated in transistors with an organic-inorganic perovskite semiconductor. This high mobility results from the well-developed perovskite crystallites, improved conversion to perovskite, reduced hole trap density, and improved hole injection by employing a top-contact/top-gate structure with surface treatment and MoOx hole-injection layers.

    DOI: 10.1002/adma.201603126

  • Influence of material impurities in the hole-blocking layer on the lifetime of organic light-emitting diodes 査読

    Hiroshi Fujimoto, Masayuki Yahiro, Satoshi Yukiwaki, Keiko Kusuhara, Nozomi Nakamura, Takashi Suekane, Hong Wei, Katsuya Imanishi, Ko Inada, Chihaya Adachi

    APPLIED PHYSICS LETTERS   109 ( 24 )   2016年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We evaluated the influence of impurities in an organic material used for the fabrication of organic light-emitting diodes (OLEDs) on the lifetime of the fabricated devices. Despite no differences in the current-density-voltage characteristics and external quantum efficiencies of the devices, the lifetime was approximately nine times longer for devices with high-purity 2,4,6-tris(biphenyl-3-yl)-1,3,5-triazine (T2T), which was used as a hole-block layer. Chlorine-containing impurities derived from T2T had the greatest influence on the lifetime of the OLEDs even though the amount of halogen in the source material was at most 0.9 ppm. On the other hand, the lifetime was not greatly influenced by other impurities even with concentrations up to 0.2&#37;. Therefore, the purities of materials other than the emitter must also be closely controlled. Published by AIP Publishing.

    DOI: 10.1063/1.4972055

  • Field-effect transistors with vacuum-deposited organic-inorganic perovskite films as semiconductor channels 査読

    Matsushima Toshinori, Yasuda Takeshi, Fujita Katsuhiko, Adachi Chihaya

    JOURNAL OF APPLIED PHYSICS   120 ( 23 )   2016年12月

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    記述言語:その他  

    Field-effect transistors with vacuum-deposited organic-inorganic perovskite films as semiconductor channels

    DOI: 10.1063/1.4972226

  • N-channel field-effect transistors with an organic-inorganic layered perovskite semiconductor 査読

    Toshinori Matsushima, Fabrice Mathevet, Benoit Heinrich, Shinobu Terakawa, Takashi Fujihara, Chuanjiang Qin, Atula S. D. Sandanayaka, Jean-Charles Ribierre, Chihaya Adachi

    APPLIED PHYSICS LETTERS   109 ( 25 )   2016年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Large electron injection barriers and electrode degradation are serious issues that need to be overcome to obtain n-channel operation in field-effect transistors with an organic-inorganic layered perovskite (C6H5C2H4NH3)(2)SnI4 semiconductor. By employing low-work-function Al source/drain electrodes and by inserting C-60 layers between the perovskite semiconductor and the Al electrodes to reduce the injection barrier and to suppress the electrode degradation, we demonstrate n-channel perovskite transistors with electron mobilities of up to 2.1 cm(2)/V s, the highest value ever reported in spin-coated perovskite transistors. The n-channel transport properties of these transistors are relatively stable in vacuum but are very sensitive to oxygen, which works as electron traps in perovskite and C-60 layers. In addition, grazing-incidence X-ray scattering and thermally stimulated current measurements revealed that crystallite size and electron traps largely affect the n-channel transport properties. Published by AIP Publishing.

    DOI: 10.1063/1.4972404

  • Influence of vacuum chamber impurities on the lifetime of organic light-emitting diodes 査読

    Hiroshi Fujimoto, Takashi Suekane, Katsuya Imanishi, Satoshi Yukiwaki, Hong Wei, Kaori Nagayoshi, Masayuki Yahiro, Chihaya Adachi

    SCIENTIFIC REPORTS   6   38482   2016年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We evaluated the influence of impurities in the vacuum chamber used for the fabrication of organic light-emitting diodes on the lifetime of the fabricated devices and found a correlation between lifetime and the device fabrication time. The contact angle of the ITO substrates stored the chamber under vacuum were used to evaluate chamber cleanliness. Liquid chromatography-mass spectrometry was performed on Si wafers stored in the vacuum chamber before device fabrication to examine the impurities in the chamber. Surprisingly, despite the chamber and evaporation sources being at room temperature, a variety of materials were detected, including previously deposited materials and plasticizers from the vacuum chamber components. We show that the impurities, and not differences in water content, in the chamber were the source of lifetime variations even when the duration of exposure to impurities only varied before and after deposition of the emitter layer. These results suggest that the impurities floating in the vacuum chamber significantly impact lifetime values and reproducibility.

    DOI: 10.1038/srep38482

  • Quasi continuous-wave lasing in organic thin-film semiconductors 査読

    Atula S. D. Sanadanayaka, Kou Yoshida, Jean-Charles Ribierre, Toshinori Matsushima, Chihaya Adachi

    ORGANIC LIGHT EMITTING MATERIALS AND DEVICES XX   9941   2016年11月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    DOI: 10.1117/12.2237466

  • Effect of 3,4,9,10-perylenetetracarboxylic bisbenzimidazole (PTCBI) as well as bathocuproine (BCP) and Ag interlayer thickness on the performance of organic tandem solar cells 査読

    Yanqiong Zheng, Fang Yang, Chao Wang, Jing Zhang, William J. Potscavage, Bin Wei, Chihaya Adachi, Wenhong Pu, Changzhu Yang, Jianhua Zhang

    SYNTHETIC METALS   221   179 - 185   2016年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Firstly, multi-fold subphthalocyanine (SubPc) homo-tandem cells were fabricated. When complementary absorbing SubPc and chloroaluminum phthalocyanine (ClAlPc) were used to prepare tandem cells, both short circuit current (J(sc)) and fill factor (FF) are significantly improved relative to the SubPc double tandem cell. 3,4,9,10-perylenetetracarboxylic bisbenzimidazole (PTCBI) as electron transporting layer (ETL) in the charge recombination zone (CRZ) achieves a much higher FF than bathocuproine (BCP) thus higher power conversion efficiency (eta(PCE)) in both the normal and reverse tandem cells, ascribed to the matched energy levels, very smooth film surface, and ohmic contact with Ag interlayer. The effect of Ag interlayer thickness was also investigated. Ultrathin Ag layer with isolated clusters is helpful for obtaining higher photocurrent in both PTCBI and BCP based CRZs, originating from a flatter interface, less optical loss, and a plasmonic effect induced absorption enhancement of C-60 in bottom subcell. By optical modeling for current matching, the performance of normal tandem cell is improved, exhibiting a high open circuit voltage of 1.80 V and an overall eta(PCE) of 3.49&#37;. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.synthmet.2016.09.001

  • Application of wide-energy-gap material 3,4-di(9H-carbazol-9-yl)benzonitrile in organic light-emitting diodes 査読

    Yuya Tanaka, Takehiro Takahashi, Junichi Nishide, Yasuhide Hiraga, Hajime Nakanotani, Chihaya Adachi

    THIN SOLID FILMS   619   120 - 124   2016年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A material with a wide energy gap, 3,4-di(9H-carbazol-9-yl) benzonitrile (2CzBN), was synthesized and applied in organic light-emitting diodes (OLEDs). Pure blue electroluminescence with a peak wavelength of 436 nm and Commission Internationale de l'Eclairage (CIE) coordinate of (0.160, 0.084) were obtained for an OLED containing 2CzBN as an emitter, although its external emission efficiency was limited to around 1&#37; because of the lack of thermally activated delayed fluorescence (TADF) activity. In contrast, a highly efficient TADF-based OLED was obtained when 2CzBN was used as a host instead of an emitter by taking advantage of the high triplet energy (2.92 eV) and unexpected electron transport capability of 2CzBN. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2016.11.016

  • Solution-processed organic thermoelectric materials exhibiting doping-concentration-dependent polarity 査読

    Sunbin Hwang, William J. Potscavage, Yu Seok Yang, In Seob Park, Toshinori Matsushima, Chihaya Adachi

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   18 ( 42 )   29199 - 29207   2016年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Recent progress in conducting polymer-based organic thermoelectric generators (OTEGs) has resulted in high performance due to high Seebeck coefficient, high electrical conductivity (sigma), and low thermal conductivity obtained by chemically controlling the materials's redox levels. In addition to improving the properties of individual OTEGs to obtain high performance, the development of solution processes for the fabrication of OTEG modules is necessary to realize large thermoelectric voltage and low-cost mass production. However, the scarcity of good candidates for soluble organic n-type materials limits the use of pi-leg module structures consisting of complementary elements of p- and n-type materials because of unbalanced transport coefficients that lead to power losses. In particular, the extremely low s of n-type materials compared with that of p-type materials is a serious challenge. In this study, poly(pyridinium phenylene) (P(PymPh)) was tested as an n-type semiconductor in solution-processed OTEGs, and the carrier density was controlled by a solution-based chemical doping process using the dopant sodium naphthalenide, a well-known reductant. The electronic structures and doping mechanism of P( PymPh) were explored based on the changes in UV-Vis-IR absorption, ultraviolet photoelectron, and X-ray photoelectron spectra. By controlling the dopant concentration, we demonstrate a maximum n-type power factor of 0.81 mu W m(-1) K-2 with high s, and at higher doping concentrations, a switch from n-type to p-type TE operation. This is one of the first cases of a switch in polarity just by increasing the concentration of the reductant and may open a new route for simplified fabrication of complementary organic layers.

    DOI: 10.1039/c6cp04572c

  • Tunable OLEDs Color Tuning of Avobenzone Boron Difluoride as an Emitter to Achieve Full-Color Emission (Adv. Funct. Mater. 37/2016) 査読

    Hin Wai Mo, Youichi Tsuchiya, Yan Geng, Takehiro Sagawa, Chika Kikuchi, Hajime Nakanotani, Fuyuki Ito, Chihaya Adachi

    Advanced Functional Materials   26 ( 37 )   2016年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adfm.201670245

  • 0.6-1.6 THz band spectroscopy of organic thermally activated delayed fluorescence materials 査読

    Harunobu Takeda, Cong Chen, Takeshi Komino, Hiroaki Yoshioka, Yuji Oki, Chihaya Adachi

    OPTICAL MATERIALS EXPRESS   6 ( 10 )   3045 - 3052   2016年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Newly developed thermally activated delayed fluorescence (TADF) materials are attractive for application in efficient displays. Five TADF materials, including PXZ-TRZ and four carbazolyl dicyanobenzene (CDCB) derivatives of 4CzTPN, 4CzTPN - Ph, 2CzPN, and 4CzIPN, were investigated using terahertz spectroscopy in the 0.60-1.60 THz range. While PXZ-TRZ was almost transparent, the carbazolyl dicyanobenzene (CDCB) derivatives, especially 4CzIPN, exhibited intrinsic absorption features. Comparing these results with density functional theorem calculations, each absorption feature was clarified to originate from the intramolecular motions of the carbazole units. (C) 2016 Optical Society of America

    DOI: 10.1364/OME.6.003045

  • Quenching Behavior of Thermally Activated Delayed Fluorescence from a Donor-Acceptor Molecule, 1,2,3,5-Tetrakis(carbazol-9-yl)-4,6-dicyanobenzene by O-2 査読

    Ryoichi Ishimatsu, Yuko Kirino, Chihaya Adachi, Koji Nakano, Toshihiko Imato

    CHEMISTRY LETTERS   45 ( 10 )   1183 - 1185   2016年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We describe the quenching behavior of thermally activated delayed fluorescence (TADF) from 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) by O-2 in bis(2-ethylhexypsebacate (DOS). Importantly, the high quantum yield of photoluminescence (phi(PL) = 0.93) with efficient TADF was dramatically decreased by O-2. The quenching rate constants of the S-1 and T-1 states were estimated to be in the order of 10(9) and 10(8) s(-1)M(-1), respectively. A DOS-plasticized polystyrene film containing 4CzIPN was prepared for optical O-2 sensing to determine O-2 concentration.

    DOI: 10.1246/cl.160561

  • Role of intermediate state in the excited state dynamics of highly efficient TADF molecules 査読

    Hosokai Takuya, Matsuzaki Hiroyuki, Furube Akihiro, Tokumaru Katsumi, Tsutsui Tetsuo, Nakanotani Hajime, Yahiro Masayuki, Adachi Chihaya

    ORGANIC LIGHT EMITTING MATERIALS AND DEVICES XX   9941   2016年9月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    Role of intermediate state in the excited state dynamics of highly efficient TADF molecules
    We hereby report the results of our direct investigation into the excited-state dynamics of thermally activated delayed fluorescence (TADF) molecules in solution using pump-probe transient absorption spectroscopy (TAS). We found that the charge-transfer (CT) state commonly stated for TADF molecules encompasses two forms: localized and delocalized CT states. A highly efficient TADF molecule, 4CzIPN [Uoyama et al., Nature, 492, 234-238 (2012)], showed both the localized and delocalized CT states, while an inefficient TADF molecule, 2CzPN, exhibited only a localized CT state. By analyzing the time profile of triplet species observed in TAS, we propose that the reverse intersystem crossing (RISC) of 4CzIPN occurs via a mutual interaction in multiple energy levels of localized neutral and CT states, and delocalized CT states.

    DOI: 10.1117/12.2236248

  • Corrigendum: Benzimidazobenzothiazole-based Bipolar Hosts to Harvest Nearly All of the Excitons from Blue Delayed Fluorescence and Phosphorescent Organic Light-Emitting Diodes. 査読

    Cui LS, Kim JU, Nomura H, Nakanotani H, Adachi C

    Angewandte Chemie (International ed. in English)   55 ( 40 )   12136   2016年9月

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    記述言語:その他  

    Corrigendum: Benzimidazobenzothiazole-based Bipolar Hosts to Harvest Nearly All of the Excitons from Blue Delayed Fluorescence and Phosphorescent Organic Light-Emitting Diodes.

    DOI: 10.1002/anie.201605553

  • High-coverage organic-inorganic perovskite film fabricated by double spin coating for improved solar power conversion and amplified spontaneous emission 査読

    Toshinori Matsushima, Munetomo Inoue, Takashi Fujihara, Shinobu Terakawa, Chuanjiang Qin, Atula S. D. Sandanayaka, Chihaya Adachi

    CHEMICAL PHYSICS LETTERS   661   131 - 135   2016年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate that double spin coating, where a perovskite film is covered with another perovskite film, can increase substrate coverage from 81&#37; to 97&#37; along with an increase of film thickness from 151 +/- 17 to 246 +/- 18 nm. The increased substrate coverage by double coating improves the solar power conversion efficiency from 7.1 +/- 0.6 to 10.3 +/- 1.0&#37;, an approximate 1.5-fold increase. Additionally, a double-coated film of higher substrate coverage exhibits amplified spontaneous emission (ASE) while a single-coated film of lower substrate coverage does not exhibit ASE. Double coating is an attractive method for increasing substrate coverage and improving solar power conversion and ASE. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2016.08.067

  • Controlling Synergistic Oxidation Processes for Efficient and Stable Blue Thermally Activated Delayed Fluorescence Devices 査読

    Lin-Song Cui, Ya-Li Deng, Daniel Ping-Kuen Tsang, Zuo-Quan Jiang, Qisheng Zhang, Liang-Sheng Liao, Chihaya Adachi

    ADVANCED MATERIALS   28 ( 35 )   7620 - +   2016年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Efficient sky-blue organic light-emitting diodes (OLEDs) employing thermally activated delayed fluorescence (TADF) display a three orders of magnitude increase in lifetime, which is superior to those of controlled phosphorescent OLEDs used in this study. The combination of electro-oxidation and photo-oxidation of the TADF emitters in their triplet excited-states is suppressed through molecule design and device engineering.

    DOI: 10.1002/adma.201602127

  • Magnesium-gold binary alloy for organic light-emitting diodes with high corrosion resistance 査読

    Hiroya Arai, Hajime Nakanotani, Kei Morimoto, Chihaya Adachi

    Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics   34 ( 4 )   2016年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors demonstrate a simple approach to obtain cathodes that have a high resistance against corrosion by water and oxygen and an air-stable work-function of -3.7 eV by doping 10 at. &#37; of gold (Au) into a magnesium (Mg) base metal layer. Organic light-emitting diodes (OLEDs) with the Mg-Au cathodes achieved electroluminescence characteristics that are comparable to those of devices with conventional cathodes such as aluminum (Al) and Mg-silver (Ag). Although OLEDs with Al or Mg-Ag cathodes exhibited a significant reduction of their emissive area when operated in air, the emissive area of the OLEDs with Mg-Au cathodes decreased only 10&#37; after 10 days of operation in ambient air without any specific encapsulation. These results suggest that Mg-Au cathodes can loosen the strict requirements for encapsulation, reducing the number of process steps and cost of OLED fabrication.

    DOI: 10.1116/1.4952408

  • Star-shaped and linear π-conjugated oligomers consisting of a tetrathienoanthracene core and multiple diketopyrrolopyrrole arms for organic solar cells. 査読

    Komiyama H, Adachi C, Yasuda T

    Beilstein journal of organic chemistry   12   1459 - 1466   2016年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Star-shaped and linear pi-conjugated oligomers consisting of a tetrathienoanthracene core and multiple diketopyrrolopyrrole arms for organic solar cells
    Solution-processable star-shaped and linear pi-conjugated oligomers consisting of an electron-donating tetrathienoanthracene (TTA) core and electron-accepting diketopyrrolopyrrole (DPP) arms, namely, TTA-DPP4 and TTA-DPP2, were designed and synthesized. Based on density functional theory calculations, the star-shaped TTA-DPP4 has a larger oscillator strength than the linear TTA-DPP2, and consequently, better photoabsorption property over a wide range of visible wavelengths. The photovoltaic properties of organic solar cells based on TTA-DPP4 and TTA-DPP2 with a fullerene derivative were evaluated by varying the thickness of the bulk heterojunction active layer. As a result of the enhanced visible absorption properties of the star-shaped pi-conjugated structure, better photovoltaic performances were obtained with relatively thin active layers (40-60 nm).

    DOI: 10.3762/bjoc.12.142

  • Enhanced Electroluminescence from a Thiophene-Based Insulated Molecular Wire 査読

    Gabor Mehes, Chengjun Pan, Fatima Bencheikh, Li Zhao, Kazunori Sugiyasu, Masayuki Takeuchi, Jean-Charles Ribierre, Chihaya Adachi

    ACS MACRO LETTERS   5 ( 7 )   781 - 785   2016年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report on the realization of polymer light-emitting diodes (PLEDs) based on fluorescent polythiophene (PT)-based insulated molecular wires (IMWs). PLEDs using PT emitting layers traditionally have low external quantum efficiencies (eta(eqe)) below 0.1&#37;. Moreover, IMWs lack a thorough exploitation for electroluminescent applications due to concerns about reduced charge transport between their chains. We constructed multilayer PLEDs containing PT IMW emitting layers that show the maximum eta(eqe) close to 1.4&#37;, luminance at 3700 cd/m(2), and low turn on voltage at 2.5 V. We also show a strong influence of the thickness of electron transport layer on eta(eqe) through device optimization and optical simulations.

    DOI: 10.1021/acsmacrolett.6b00205

  • Thermally Activated Delayed Fluorescence from Pentacarbazorylbenzonitrile 査読

    Shuho Tanimoto, Takatsugu Suzuki, Hajime Nakanotani, Chihaya Adachi

    CHEMISTRY LETTERS   45 ( 7 )   770 - 772   2016年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A benzonitrile derivative substituted by five carbazoles (5CzBN), which emits thermally activated delayed fluorescence (TADF), was synthesized and evaluated. The organic light-emitting diode (OLED) containing 5CzBN demonstrated light-blue electro-luminescence and a high external quantum efficiency of 14.8&#37;.

    DOI: 10.1246/cl.160290

  • Microcrystallization of a Solution-Processable Organic Semiconductor in Capillaries for High-Performance Ambipolar Field Effect Transistors 査読

    Satoshi Watanabe, Takuma Fujita, Jean-Charles Ribierre, Kazuto Takaishi, Tsuyoshi Muto, Chihaya Adachi, Masanobu Uchiyama, Tetsuya Aoyama, Mutsuyoshi Matsumoto

    ACS APPLIED MATERIALS & INTERFACES   8 ( 27 )   17574 - 17582   2016年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report on the use of microcrystallization in capillaries to fabricate patterned crystalline microstructures of the low-bandgap ambipolar quinoidal quaterthiophene derivative (QQT(CN)(4)) from a chloroform solution. Aligned needle -shaped QQT(CN)(4) crystals were formed in thin film microstructures using either open-or closed capillaries made of polydimethylsiloxane (PDMS). Their charge transport properties were evaluated in a bottom-gate top-contact 10(-5) transistor configuration. Hole and electron mobilities were found to be as high as 0.17 and 0.083 cm(2) V-1 s(-1), respectively, approaching the values previously obtained in individual QQT(CN)(4) single crystal microneedles. It was possible to control the size of the needle crystals and the microline arrays by adjusting the structure of the PDMS mold and the concentration of QQT(CN)(4) solution. These results demonstrate that the microcrystallization in capillaries technique can be used to simultaneously pattern organic needle single crystals and control the microcrystallization processes. Such a simple and versatile method should be promising for the future development of high-performance organic electronic devices.

    DOI: 10.1021/acsami.5b12713

  • Magnesium-gold binary alloy for organic light-emitting diodes with high corrosion resistance 査読

    Hiroya Arai, Hajime Nakanotani, Kei Morimoto, Chihaya Adachi

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B   34 ( 4 )   2016年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors demonstrate a simple approach to obtain cathodes that have a high resistance against corrosion by water and oxygen and an air-stable work-function of similar to 3.7 eV by doping 10 at. &#37; of gold (Au) into a magnesium (Mg) base metal layer. Organic light-emitting diodes (OLEDs) with the Mg-Au cathodes achieved electroluminescence characteristics that are comparable to those of devices with conventional cathodes such as aluminum (Al) and Mg-silver (Ag). Although OLEDs with Al or Mg-Ag cathodes exhibited a significant reduction of their emissive area when operated in air, the emissive area of the OLEDs with Mg-Au cathodes decreased only 10&#37; after 10 days of operation in ambient air without any specific encapsulation. These results suggest that Mg-Au cathodes can loosen the strict requirements for encapsulation, reducing the number of process steps and cost of OLED fabrication. (C) 2016 American Vacuum Society.

    DOI: 10.1116/1.4952408

  • Blue Oleds: High-Efficiency Blue Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence from Phenoxaphosphine and Phenoxathiin Derivatives (Adv. Mater. 23/2016) 査読

    Sae Youn Lee, Chihaya Adachi, Takuma Yasuda

    Advanced Materials   28 ( 23 )   4625   2016年6月

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    記述言語:英語  

    DOI: 10.1002/adma.201670160

  • Electroluminescence from completely horizontally oriented dye molecules 査読

    Takeshi Komino, Yuta Sagara, Hiroyuki Tanaka, Yuji Oki, Nozomi Nakamura, Hiroshi Fujimoto, Chihaya Adachi

    APPLIED PHYSICS LETTERS   108 ( 24 )   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A complete horizontal molecular orientation of a linear-shaped thermally activated delayed fluorescent guest emitter 2,6-bis(4-(10Hphenoxazin-10-yl)phenyl)benzo[1,2-d:5,4-d'] bis(oxazole) (cis-BOX2) was obtained in a glassy host matrix by vapor deposition. The orientational order of cis-BOX2 depended on the combination of deposition temperature and the type of host matrix. Complete horizontal orientation was obtained when a thin film with cis-BOX2 doped in a 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP) host matrix was fabricated at 200 K. The ultimate orientation of guest molecules originates from not only the kinetic relaxation but also the kinetic stability of the deposited guest molecules on the film surface during film growth. Utilizing the ultimate orientation, a highly efficient organic light-emitting diode with the external quantum efficiency of 33.4+/-2.0&#37; was realized. The thermal stability of the horizontal orientation of cis-BOX2 was governed by the glass transition temperature (T-g) of the CBP host matrix; the horizontal orientation was stable unless the film was annealed above T-g. Published by AIP Publishing.

    DOI: 10.1063/1.4954163

  • Quasi-Continuous-Wave Organic Thin-Film Distributed Feedback Laser 査読

    Atula S. D. Sandanayaka, Kou Yoshida, Munetomo Inoue, Chuanjiang Qin, Kenichi Goushi, Jean-Charles Ribierre, Toshinori Matsushima, Chihaya Adachi

    ADVANCED OPTICAL MATERIALS   4 ( 6 )   834 - 839   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adom.201600006

  • Thermally Activated Delayed Fluorescence Polymers for Efficient Solution-Processed Organic Light-Emitting Diodes 査読

    Sae Youn Lee, Takuma Yasuda, Hideaki Komiyama, Jiyoung Lee, Chihaya Adachi

    ADVANCED MATERIALS   28 ( 21 )   4019 - 4024   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermally activated delayed fluorescence (TADF) pi-conjugated polymers are developed for solution-processed TADF-OLEDs. Benzophenone-based alternating donor-acceptor structures contribute to the small Delta E-ST, enabling efficient exciton-harvesting through TADF. Solution-processed OLEDs using the TADF polymers as emitters can achieve high maximum external electroluminescence efficiencies of up to 9.3&#37;.

    DOI: 10.1002/adma.201505026

  • High-Efficiency Blue Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence from Phenoxaphosphine and Phenoxathiin Derivatives 査読

    Sae Youn Lee, Chihaya Adachi, Takuma Yasuda

    ADVANCED MATERIALS   28 ( 23 )   4626 - 4631   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    High-efficiency blue thermally activated delayed fluorescence (TADF) molecules, consisting of phenoxaphosphine oxide and phenoxathiin dioxide as acceptor units and 9,9-dimethylacridan as a donor unit, are reported. Maximum external electroluminescence quantum efficiencies of up to 20.5&#37; are achieved in blue organic light-emitting diodes (OLEDs) by employing these materials as TADF emitters.

    DOI: 10.1002/adma.201506391

  • Benzimidazobenzothiazole-Based Bipolar Hosts to Harvest Nearly All of the Excitons from Blue Delayed Fluorescence and Phosphorescent Organic Light-Emitting Diodes 査読

    Lin-Song Cui, Jong Uk Kim, Hiroko Nomura, Hajime Nakanotani, Chihaya Adachi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   55 ( 24 )   6864 - 6868   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Much effort has been devoted to developing highly efficient organic light-emitting diodes (OLEDs) that function through phosphorescence or thermally activated delayed fluorescence (TADF). However, efficient host materials for blue TADF and phosphorescent guest emitters are limited because of their requirement of high triplet energy levels. Herein, we report the rigid acceptor unit benzimidazobenzothiazole (BID-BT), which is suitable for use in bipolar hosts in blue OLEDs. The designed host materials, based on BID-BT, possess high triplet energy and bipolar carrier transport ability. Both blue TADF and phosphorescent OLEDs containing BID-BT-based derivatives exhibit external quantum efficiencies as high as 20&#37;, indicating that these hosts allow efficient triplet exciton confinement appropriate for blue TADF and phosphorescent guest emitters.

    DOI: 10.1002/anie.201601136

  • Operational stability enhancement in organic light-emitting diodes with ultrathin Liq interlayers (vol 6, 22463, 2016) 査読

    Daniel Ping-Kuen Tsang, Toshinori Matsushima, Chihaya Adachi

    SCIENTIFIC REPORTS   6   26921   2016年5月

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    記述言語:英語  

    DOI: 10.1038/srep26921

  • Increased Vis-to-UV upconversion performance by energy level matching between a TADF donor and high triplet energy acceptors 査読 国際誌

    Nobuhiro Yanai; Mariko Kozue; Shogo Amemori; Ryota Kabe; Chihaya Adachi; Nobuo Kimizuka

    J. Mater. Chem. C   4 ( 27 )   6447 - 6451   2016年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C6TC01816E

  • Current Enhancement in Organic Films through Gap Compression by Cold and Hot Isostatic Pressing 査読

    Yu Esaki, Toshinori Matsushima, Chihaya Adachi

    ADVANCED FUNCTIONAL MATERIALS   26 ( 17 )   2940 - 2949   2016年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The spatial gaps in organic films are compressed using cold and hot isostatic pressing (CIP and HIP, respectively) with the aim of enhancing their electrical characteristics. The microscopic gaps formed in amorphous organic films by inefficient molecular packing are difficult to compress using CIP and HIP; however, the macroscopic gaps formed between grains and other grains or substrates in polycrystalline organic films can be compressed using CIP and HIP. The gap compression by CIP and HIP in polycrystalline films enhances their electrical characteristics. Conversely, the electrical characteristics of amorphous films remain unchanged after CIP and HIP. HIP gives almost the same results as CIP in terms of gap compression and current enhancement, probably because the expected activation of molecular motion at high temperature is suppressed under high applied pressure. CIP markedly improves the performance of organic light-emitting diodes, organic solar cells, and organic field-effect transistors containing polycrystalline films. These findings are important for understanding the carrier injection and transport mechanisms of organic films containing gaps as well as enhancing the performance of future organic devices, especially those with polycrystalline films.

    DOI: 10.1002/adfm.201505190

  • Self-Assembly of Electron Donor-Acceptor-Based Carbazole Derivatives: Novel Fluorescent Organic Nanoprobes for Both One- and Two-Photon Cellular Imaging 査読

    Jinfeng Zhang, Wencheng Chen, Sergii Kalytchuk, King Fai Li, Rui Chen, Chihaya Adachi, Zhan Chen, Andrey L. Rogach, Guangyu Zhu, Peter K. N. Yu, Wenjun Zhang, Kok Wai Cheah, Xiaohong Zhang, Chun-Sing Lee

    ACS APPLIED MATERIALS & INTERFACES   8 ( 18 )   11355 - 11365   2016年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this study, we report fluorescent organic nanoprobes with intense blue, green, and orange-red emissions prepared by self-assembling three carbazole derivatives into nanorods/nanoparticles. The three compounds consist of two or four electron-donating carbazole groups linked to a central dicyanobenzene electron acceptor. Steric hindrance from the carbazole groups leads to noncoplanar 3D molecular structures favorable to fluorescence in the solid state, while the donor acceptor structures endow the molecules with good two photon excited emission properties. The fluorescent organic nanoprobes exhibit good water dispersibility, low cytotoxicity, superior resistance against photodegradation and photo bleaching. Both one- and two-photon fluorescent imaging were shown in the A549 cell line. Two-photon fluorescence imaging with the fluorescent probes was demonstrated to be more effective in visualizing and distinguishing cellular details compared to conventional one-photon fluorescence imaging.

    DOI: 10.1021/acsami.6b03259

  • Improvement of the quasi-continuous-wave lasing properties in organic semiconductor lasers using oxygen as triplet quencher 査読

    Atula S. D. Sandanayaka, Li Zhao, Delphine Pitrat, Jean-Christophe Mulatier, Toshinori Matsushima, Chantal Andraud, Ju-Hyung Kim, Jean-Charles Ribierre, Chihaya Adachi

    APPLIED PHYSICS LETTERS   108 ( 22 )   2016年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate quasi-continuous-wave lasing in solvent-free liquid organic semiconductor distributed feedback lasers based on a blend containing a liquid 9-(2-ethylhexyl)carbazole host doped with a blue-emitting heptafluorene derivative. The liquid gain medium is bubbled with either oxygen or nitrogen in order to investigate the role of a triplet quencher such as molecular oxygen on the quasi-continuous-wave lasing properties of organic semiconductor lasers. The oxygenated laser device exhibits a low threshold of 2 mu J cm(-2), which is lower than that measured in the nitrogenated device and is independent of the repetition rate in a range between 0.01 and 4 MHz. Published by AIP Publishing.

    DOI: 10.1063/1.4952970

  • Increased Vis-to-UV upconversion performance by energy level matching between a TADF donor and high triplet energy acceptors 査読 国際誌

    Nobuhiro Yanai; Mariko Kozue; Shogo Amemori; Ryota Kabe; Chihaya Adachi; Nobuo Kimizuka

    J. Mater. Chem. C   4 ( 27 )   6447 - 6451   2016年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C6TC01816E

  • Photoluminescence in a Thermally Activated Delayed Fluorescence Emitter for Organic Light-emitting Diodes (ICAI論文特集) 査読 国際誌

    NIWA Akitsugu, TAKAKI Kensho, KOBAYASHI Takashi, NAGASE Takashi, GOUSHI Kenichi, ADACHI Chihaya, NAITO Hiroyoshi

    日本画像学会誌   55 ( 2 )   143 - 148   2016年4月

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    記述言語:英語  

    Thermally activated delayed fluorescence (TADF) has attracted much attention for realization of highly-efficient and low-cost organic light emitting diodes (OLEDs). OLEDs based on 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN), which is one of highly-efficient TADF emitters, have been demonstrated to exhibit external quantum efficiency more than 19&#37;. To study the decay rates from excited states of 4CzIPN, the temperature dependence of photoluminescence quantum efficiency (PLQE) has been measured in the weak photoexcitation limit in 4CzIPN-doped 1,3-bis(9-carbazolyl)benzene thin films. Characteristic features of the temperature dependence of PLQE in the weak photoexcitation limit are found, and examined by using rate equations of singlet and triplet densities.

    DOI: 10.11370/isj.55.143

  • Processing and doping of thick polymer active layers for flexible organic thermoelectric modules 査読

    Sunbin Hwang, William J. Potscavage, Ryosuke Nakamichi, Chihaya Adachi

    ORGANIC ELECTRONICS   31   31 - 40   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    While the majority of research on organic thermoelectric generators has focused on individual devices with organic films having thicknesses of several hundred nanometers (nano-films), films with micrometer-scale thicknesses (micro-films) provide a longer thermal conduction path that results in a larger temperature gradient and higher thermoelectric voltages in modules. In this study, the properties of solution-processed nano-and micro-films of the p-type semiconductor P3HT doped with two different dopants, F-4-TCNQ and Fe3+-tos(3)center dot 6H(2)O, were investigated. While doping with F-4-TCNQ resulted in high electrical conductivity only in nano-films, doping with Fe3+-tos(3)center dot 6H(2)O from a 25 mM solution yielded power factors of up to similar to 30 mu Wm(-1) K-2 with a conductivity of 55.4 Scm(-1) in micro-films. Changes in the molecular packing were compared based on X-ray diffraction, and the best operational stability in air was found for the Fe3+-tos(3)center dot 6H(2)O-doped micro-films. Using Fe3+-tos(3)center dot 6H(2)O as dopant, flexible thermoelectric modules with solution-processed micro-films patterned by a photo-etching technique that does not require alignment and assembly of individual devices were demonstrated, exhibiting a maximum power output of 1.94 nWK(-2) for a uni-leg module with 48 elements. Analysis of the flexible module performance showed that the performance is limited by the contact resistance, which must be taken into consideration when optimizing module structure. (c) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2016.01.007

  • Quantification of temperature rise in unipolar organic conductors during short voltage-pulse excitation using electrical testing methods 査読

    Kou Yoshida, Toshinori Matsushima, Hajime Nakanotani, Chihaya Adachi

    ORGANIC ELECTRONICS   31   191 - 197   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To quantify the rise in device temperature caused by Joule heating during short voltage-pulse excitation at high current densities (> 10 A/cm(2)), the device temperatures of unipolar organic conductors were measured using electrical testing methods. For a maximum voltage amplitude of 59 V at a current density of similar to 300 A/cm(2), temperature rose over 145 degrees C within a pulse duration of 5 mu s in an N,N'-di(1-naphthyl)-N,N'-diphenylbenzidine (alpha-NPD)-based single-carrier organic conductor. This result is in reasonable agreement with numerically calculated values. These findings indicate that suppressing the effects of Joule heating by carefully adjusting pulse width, substrate and organic materials, and device configuration is important to achieve further carrier injection in the ultra-high current density region (> 1 kA/cm(2)). (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2016.01.033

  • Effect of Joule heating on transient current and electroluminescence in p-i-n organic light-emitting diodes under pulsed voltage operation 査読

    Kou Yoshida, Hajime Nakanotani, Chihaya Adachi

    ORGANIC ELECTRONICS   31   287 - 294   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The transient current and electroluminescent characteristics of p-i-n organic light-emitting diodes driven using short voltage pulses with various amplitudes and pulse widths were investigated to understand high current behavior (>10 A/cm(2)). Even under short voltage pulse operation, Joule heating was found to strongly affect the transient characteristics and lead to temperature rises estimated to be over 100 K in the high current density region (>400 A/cm(2)). This results in a large increase in both current density and EL intensity within the pulse width. In addition, the Joule heating was found to have an effect on the external quantum efficiency. However its contribution was found to be limited compared with the other quenching mechanism, singlet-polaron quenching. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2016.01.039

  • Silicon based near infrared photodetector using self-assembled organic crystalline nano-pillars 査読

    Yoshiharu Ajiki, Tetsuo Kan, Masayuki Yahiro, Akiko Hamada, Junji Adachi, Chihaya Adachi, Kiyoshi Matsumoto, Isao Shimoyama

    APPLIED PHYSICS LETTERS   108 ( 15 )   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We propose a silicon (Si) based near-infrared photodetector using self-assembled organic crystalline nano-pillars, which were formed on an n-type Si substrate and were covered with an Au thin-film. These structures act as antennas for near-infrared light, resulting in an enhancement of the light absorption on the Au film. Because the Schottky junction is formed between the Au/n-type Si, the electron excited by the absorbed light can be detected as photocurrent. The optical measurement revealed that the nano-pillar structures enhanced the responsivity for the near-infrared light by 89 (14.5 mA/W) and 16 (0.433 mA/W) times compared with those of the photodetector without nano-pillars at the wavelengths of 1.2 and 1.3 mu m, respectively. Moreover, no polarization dependency of the responsivity was observed, and the acceptable incident angle ranged from 0 degrees to 30 degrees. These broad responses were likely to be due to the organic nano-pillar structures' having variation in their orientation, which is advantageous for near-infrared detector uses. (C) 2016 AIP Publishing LLC.

    DOI: 10.1063/1.4945690

  • A Phenazaborin-Based High-Efficiency Blue Delayed Fluorescence Material 査読

    In Seob Park, Masaki Numata, Chihaya Adachi, Takuma Yasuda

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   89 ( 3 )   375 - 377   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A highly efficient blue thermally activated delayed fluorescence (TADF) material based on phenazaborin and spiroacridan units was developed. A blue-emitting organic light-emitting diode containing the phenazaborin derivative as a TADF emitter exhibited a high external electro-luminescence quantum efficiency of 18.2&#37;.

    DOI: 10.1246/bcsj.20150399

  • Low amplified spontaneous emission threshold and suppression of electroluminescence efficiency roll-off in layers doped with ter(9,9 '-spirobifluorene) 査読

    Munetomo Inoue, Toshinori Matsushima, Chihaya Adachi

    APPLIED PHYSICS LETTERS   108 ( 13 )   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate that ter(9,9'-spirobifluorene) (TSBF) doped in a host matrix layer of 4,4'-bis (carbazol-9-yl) biphenyl (CBP) shows a low amplified spontaneous emission (ASE) threshold (E-th = 1.0 mu J cm(-2)) and suppressed electroluminescence efficiency roll-off at high current densities (no roll-off up to 100mAcm(-2)). One origin of the low ASE threshold is that the TSBF-doped CBP layer possesses a very large radiative decay constant (k(r) = 1.1 x 10(9) s(-1)). Singlet-triplet annihilation is almost suppressed in the TSBF-doped CBP layer, which can be ascribed to the small overlap between the emission and triplet absorption of TSBF. Also, the small energy level difference between TSBF and CBP minimizes carrier trapping in TSBF, leading to the suppression of singlet-polaron annihilation. TSBF showed one of the lowest Eth and the most suppressed efficiency rolloff among organic laser dyes investigated in this study and, therefore, is believed to be a promising candidate to realize electrically pumped organic semiconductor laser diodes in the future. (C) 2016 AIP Publishing LLC.

    DOI: 10.1063/1.4945596

  • Full-Color Delayed Fluorescence Materials Based on Wedge-Shaped Phthalonitriles and Dicyanopyrazines: Systematic Design, Tunable Photophysical Properties, and OLED Performance 査読

    In Seob Park, Sae Youn Lee, Chihaya Adachi, Takuma Yasuda

    ADVANCED FUNCTIONAL MATERIALS   26 ( 11 )   1813 - 1821   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Purely organic light-emitting materials, which can harvest both singlet and triplet excited states to offer high electron-to-photon conversion efficiencies, are essential for the realization of high-performance organic light-emitting diodes (OLEDs) without using precious metal elements. Donor-acceptor architectures with an intramolecular charge-transfer excited state have been proved to be a promising system for achieving these requirements through a mechanism of thermally activated delayed fluorescence (TADF). Here, luminescent wedge-shaped molecules, which comprise a central phthalonitrile or 2,3-dicyanopyrazine acceptor core coupled with various donor units, are reported as TADF emitters. This set of materials allows systematic fine-tuning of the band gap and exhibits TADF emissions that cover the entire visible range from blue to red. Full-color TADF-OLEDs with high maximum external electroluminescence quantum efficiencies of up to 18.9&#37; have been demonstrated by using these phthalonitrile and 2,3-dicyanopyrazine-based TADF emitters.

    DOI: 10.1002/adfm.201505106

  • Photophysical Properties and Efficient, Stable, Electrogenerated Chemiluminescence of Donor-Acceptor Molecules Exhibiting Thermal Spin Upconversion 査読

    Ryoichi Ishimatsu, Tomohiko Edura, Chihaya Adachi, Koji Nakano, Toshihiko Imato

    CHEMISTRY-A EUROPEAN JOURNAL   22 ( 14 )   4889 - 4898   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The photophysical properties and electrogenerated chemiluminescence (ECL) of three donor-acceptor molecules composed of dicyanobenzene and methyl-, tert-butyl-, and phenyl-substituted carbazolyl groups, 1,2,3,5-tetrakis(3,6-disubstituted-carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN-Me, 4CzIPN-tBu, and 4CzIPN-Ph, respectively) are described. These molecules show delayed fluorescence as a result of thermal spin upconversion from the lowest triplet state to the lowest singlet state at room temperature. The three molecules showed yellow to yellowish-red ECL. Remarkably, the ECL efficiencies of 4CzIPN-tBu in dichloromethane reached almost 40&#37;. Moreover, stable ECL was emitted from 4CzIPN-tBu and 4CzIPN-Ph. In case of 4CzIPN-Me, the ECL intensity decreased during voltage cycles because of polymerization. Quantum chemical calculations revealed that polymerization was inhibited by the steric hindrance of the bulky tert-butyl and phenyl groups on the carbazolyl moieties and lowered the spin density on the carbazolyl groups through electron conjugation for 4CzIPN-Ph.

    DOI: 10.1002/chem.201600077

  • Operational stability enhancement in organic light-emitting diodes with ultrathin Liq interlayers 査読

    Daniel Ping-Kuen Tsang, Chihaya Adachi

    SCIENTIFIC REPORTS   6   22463   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic light-emitting diodes (OLEDs) under constant current operation suffer from a decrease of luminance accompanied by an increase of driving voltage. We report a way to greatly improve the stability of OLEDs having a green emitter exhibiting thermally activated delayed fluorescence (TADF), (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl) isophthalonitrile (4CzIPN), by introducing ultrathin (1 to 3 nm) interlayers of 8-hydroxyquinolinato lithium (Liq) between hole-blocking layer and its surrounding emissive and electron-transport layers. Under constant current operation starting at a luminescence of 1,000 cd/m(2), the time to reach 90&#37; of initial luminance (LT90) increased eight times, resulting in LT90 = 1,380 hours after insertion of the interlayers. Combining this new concept and mixed host system, LT95 was further extended to 1315 hours that is 16 times of reference device. This is the best value reported for TADF-based OLEDs and is comparable to the operational lifetimes of well-established phosphorescence-based OLEDs. Thermally stimulated current measurements showed that the number of deep charge traps was reduced with the insertion of the ultrathin Liq interlayer, indicating that reducing the number of deep traps is important for improving the operational lifetime and that exciton-polaron annihilation may be a source of the device degradation.

    DOI: 10.1038/srep22463

  • 【2016-2】Highly efficient solution-processed host-free organic light-emitting diodes showing an external quantum efficiency of nearly 18&#37; with a thermally activated delayed fluorescence emitter 査読

    Wada, Y, Shizu, K, Kubo, S, Fukushima, T, Miwa, T, Tanaka, H, Adachi, C, Kaji, H

    Appl. Phys. Express   9 ( 3 )   [032102-1] - [032102-3]   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Highly effi cient solution-processed host-free organic light-emitting diodes showing an external quantum effi ciency of nearly 18&#37; with a thermally activated delayed fl uorescence emitter
    We demonstrate solution-processed host-free organic light-emitting diodes (OLEDs) using a thermally activated delayed fluorescence emitter 10-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-9,9-dimethylacridan (DMAC-TRZ). A spin-coated neat DMAC-TRZ film shows weak concentration quenching, leading to a high photoluminescence quantum yield (PLQY) of 84&#37;. OLEDs containing a neat film of DMAC-TRZ display a maximum external quantum efficiency (EQE) of 17.6&#37;. Both the PLQY and EQE are the highest reported for solution-processed host-free films and OLEDs, respectively. In addition, the OLEDs exhibit an EQE of 16.8&#37; at high luminance (over 400 cd m&#37;2).

    DOI: 10.7567/APEX.9.032102

  • Long-range coupling of electron-hole pairs in spatially separated organic donor-acceptor layers 査読

    Hajime Nakanotani, Taro Furukawa, Kei Morimoto, Chihaya Adachi

    SCIENCE ADVANCES   2 ( 2 )   e1501470   2016年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Understanding exciton behavior in organic semiconductor molecules is crucial for the development of organic semiconductor-based excitonic devices such as organic light-emitting diodes and organic solar cells, and the tightly bound electron-hole pair forming an exciton is normally assumed to be localized on an organic semi-conducting molecule. We report the observation of long-range coupling of electron-hole pairs in spatially separated electron-donating and electron-accepting molecules across a 10-nm-thick spacer layer. We found that the exciton energy can be tuned over 100 meV and the fraction of delayed fluorescence can be increased by adjusting the spacer-layer thickness. Furthermore, increasing the spacer-layer thickness produced an organic light-emitting diode with an electroluminescence efficiency nearly eight times higher than that of a device without a spacer layer. Our results demonstrate the first example of a long-range coupled charge-transfer state between electron-donating and electron-accepting molecules in a working device.

    DOI: 10.1126/sciadv.1501470

  • Seamless growth of a supramolecular carpet 査読

    Ju-Hyung Kim, Jean-Charles Ribierre, Yu Seok Yang, Chihaya Adachi, Maki Kawai, Jaehoon Jung, Takanori Fukushima, Yousoo Kim

    NATURE COMMUNICATIONS   7   10653   2016年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic/metal interfaces play crucial roles in the formation of intermolecular networks on metal surfaces and the performance of organic devices. Although their purity and uniformity have profound effects on the operation of organic devices, the formation of organic thin films with high interfacial uniformity on metal surfaces has suffered from the intrinsic limitation of molecular ordering imposed by irregular surface structures. Here we demonstrate a supramolecular carpet with widely uniform interfacial structure and high adaptability on a metal surface via a one-step process. The high uniformity is achieved with well-balanced interfacial interactions and site-specific molecular rearrangements, even on a pre-annealed amorphous gold surface. Co-existing electronic structures show selective availability corresponding to the energy region and the local position of the system. These findings provide not only a deeper insight into organic thin films with high structural integrity, but also a new way to tailor interfacial geometric and electronic structures.

    DOI: 10.1038/ncomms10653

  • Organic nanostructures of thermally activated delayed fluorescent emitters with enhanced intersystem crossing as novel metal-free photosensitizers 査読

    Jinfeng Zhang, Wencheng Chen, Rui Chen, Xiao Ke Liu, Yuan Xiong, Stephen V. Kershaw, Andrey L. Rogach, Chihaya Adachi, Xiaohong Zhang, Chun Sing Lee

    Chemical Communications   52 ( 79 )   11744 - 11747   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We applied organic nanostructures based on thermally activated delayed fluorescent (TADF) emitters for singlet oxygen generation. Due to the extremely small energy gaps between the excited singlet states (S1) and triplet states (T1) of these heavy-metal-free organic nanostructures, intersystem conversion between S1 and T1 can occur easily. This strategy also works well for exciplex-type TADF emitters prepared by mixing suitable donors and acceptors which have no TADF characteristics themselves.

    DOI: 10.1039/c6cc05130h

  • Enhanced organic solar cells efficiency through electronic and electro-optic effects resulting from charge transfers in polymer hole transport blends 査読

    Calvyn T. Howells, Khalid Marbou, Haeri Kim, Kwang Jin Lee, Benoît Heinrich, Sang Jun Kim, Aiko Nakao, Tetsua Aoyama, Seiichi Furukawa, Ju Hyung Kim, Eunsun Kim, Fabrice Mathevet, Stéphane Mery, Ifor D.W. Samuel, Amal Al Ghaferi, Marcus S. Dahlem, Masanobu Uchiyama, Sang Youl Kim, Jeong Weon Wu, Jean Charles Ribierre, Chihaya Adachi, Dong Wook Kim, Pascal André

    Journal of Materials Chemistry A   4 ( 11 )   4252 - 4263   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate that blending fluorinated molecules in PEDOT:PSS hole transport layers (HTL) induces charge transfers which impact on both charge extraction and photogeneration within organic photovoltaic (OPV) devices. OPVs fabricated with modified HTL and two photoactive polymer blends led systematically to power conversion efficiencies (PCE) increases, with PTB7:PC70BM blend exhibiting PCE of ∼8.3%, i.e. ∼15% increase compared to pristine HTL devices. A reduced device-to-device characteristics variations was also noticed when fluorinated additives were used to modify the PEDOT:PSS. Shading lights onto the effect of HTL fluorination, we show that the morphology of the polymer:PCBM blends remains surprisingly unaffected by the fluorinated HTL surface energy but that, instead, the OPVs are impacted not only by the HTL electronic properties (work function, dipole layer, open circuit voltage, charge transfer dynamic) but also by alteration of the complex refractive indices (photogeneration, short circuit current density, external quantum efficiencies, electro-optic modelling). Both mechanisms find their origin in fluorination induced charge transfers. This work points towards fluorination as a promising strategy toward combining both external quantum efficiency modulation and power conversion efficiency enhancement in OPVs. Charge transfers could also be used more broadly to tune the optical constants and electric field distribution, as well as to reduce interfacial charge recombinations within OPVs.

    DOI: 10.1039/c6ta00677a

  • Horizontal molecular orientation of light-emitting oligofluorenes in spin-coated glassy organic thin films 査読

    Li Zhao, Takeshi Komino, Dae Hyeon Kim, Muhammad Hasnan Sazzad, Delphine Pitrat, Jean Christophe Mulatier, Chantal Andraud, Jean Charles Ribierre, Chihaya Adachi

    Journal of Materials Chemistry C   4 ( 48 )   11557 - 11565   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Horizontal orientation of light-emitting chromophores plays a critical role in the light outcoupling efficiency and the overall performances of organic light-emitting diodes. Here, we demonstrate that such a horizontal orientation of light-emitting molecules can be achieved in solution-processed blends containing highly fluorescent oligofluorenes dispersed into various small molecule host materials. The influences of the host material, the solvent used for the spin-coating, the doping concentration of the oligofluorenes and the oligofluorene chemical structure on these orientational processes are investigated using variable angle spectroscopic ellipsometry and angle-dependent photoluminescence measurements. By clarifying the roles played by these parameters in the horizontal orientation of the emitters, the results provide crucial insights into these molecular orientational processes in spin-coated glassy organic thin films, which should be relevant for the development of high-efficiency solution-processed organic light-emitting diodes in the near future.

    DOI: 10.1039/c6tc02861f

  • Effect of reverse intersystem crossing rate to suppress efficiency roll-off in organic light-emitting diodes with thermally activated delayed fluorescence emitters 査読

    Munetomo Inoue, Tomas Serevicius, Hajime Nakanotani, Kou Yoshida, Toshinori Matsushima, Saulius Jursenas, Chihaya Adachi

    CHEMICAL PHYSICS LETTERS   644   62 - 67   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Electroluminescence efficiency roll-off in organic light-emitting diodes with thermally activated delayed fluorescence emitters 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN) and 3-(9,9-dimethylacridin-10(9H)-yl)-9H-xanthen-9-one (ACRXTN) is investigated by considering intramolecular exciton relaxation processes. Electroluminescence efficiency roll-off at high current density is dramatically suppressed using ACRXTN as an emitter instead of 2CzPN because of suppressed bimolecular exciton annihilation processes such as singlet-triplet and triplet-triplet annihilation. The rate constant of reverse intersystem crossing from triplet to singlet excited states of ACRXTN is about 300 times higher than that of 2CzPN, decreasing triplet exciton density and suppressing exciton annihilation processes under optical and electrical excitation. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2015.11.042

  • Singlet-Triplet Exciton Annihilation Nearly Suppressed in Organic Semiconductor Laser Materials Using Oxygen as a Triplet Quencher 査読

    Li Zhao, Munetomo Inoue, Kou Yoshida, Atula S. D. Sandanayaka, Ju-Hyung Kim, Jean-Charles Ribierre, Chihaya Adachi

    IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS   22 ( 1 )   34   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report on the use of oxygen as triplet quencher to reduce singlet-triplet annihilation in light-emitting organic solid films and solvent-free molecular semiconducting liquids. For this purpose, a fluorescent heptafluorene derivative is dispersed either in a wide bandgap 4,4'-Bis (N-carbazolyl)-1,1'-biphenyl (CBP) host or in a solvent-free liquid matrix based on 9-(2-ethylhexyl) carbazole (EHCz). To introduce oxygen in the samples, a modified cold isostatic pressure technique is used in the case of spin-coated CBP blends while oxygen is bubbled in the liquids. The influence of the oxygenation on their photophysical and amplified spontaneous emission properties is examined. Both solid blend films and liquids showed before and after the introduction of oxygen a photoluminescence quantum yield higher than 80&#37; and an amplified spontaneous emission threshold lower than 0.4 mu J/cm(2). While oxygen does not quench significantly the singlet excitons in these systems, singlet-triplet annihilation is strongly reduced in solid thin films and nearly suppressed in the liquid layers. This study demonstrates that liquid organic semiconductors are promising candidates for optically pumped continuous wave lasers and provides important insights for a more effective triplet management in organic semiconductor lasers.

    DOI: 10.1109/JSTQE.2015.2473138

  • Afterglow Organic Light-Emitting Diode 査読

    Ryota Kabe, Naoto Notsuka, Kou Yoshida, Chihaya Adachi

    ADVANCED MATERIALS   28 ( 4 )   655 - 660   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    An afterglow organic light-emitting diode (OLED) that displays electroluminescence with long transient decay after it is turned off is demonstrated. This OLED exhibits blue and green dual emission originating from fluorescence and phosphorescence, respectively. A phosphorescence lifetime of 4.3 s is achieved.

    DOI: 10.1002/adma.201504321

  • Degradation Mechanisms of Solution-Processed Planar Perovskite Solar Cells: Thermally Stimulated Current Measurement for Analysis of Carrier Traps 査読

    Chuanjiang Qin, Toshinori Matsushima, Takashi Fujihara, William J. Potscavage, Chihaya Adachi

    ADVANCED MATERIALS   28 ( 3 )   466 - 471   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Degradation mechanisms of CH3NH3PbI3-based planar perovskite solar cells (PSCs) are investigated using a thermally stimulated current technique. Hole traps lying above the valence-band edge of the CH3NH3PbI3 are detected in PSCs degraded by continuous simulated solar illumination. One source of the hole traps is the photo-degradation of CH3NH3PbI3 in the presence of water.

    DOI: 10.1002/adma.201502610

  • Triarylboron-Based Fluorescent Organic Light-Emitting Diodes with External Quantum Efficiencies Exceeding 20 &#37;

    Katsuaki Suzuki, Shosei Kubo, Katsuyuki Shizu, Tatsuya Fukushima, Atsushi Wakamiya, Yasujiro Murata, Chihaya Adachi, Hironori Kaji

    Angewandte Chemie   127 ( 50 )   15446 - 15450   2015年12月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/ange.201508270

  • Triarylboron-Based Fluorescent Organic Light-Emitting Diodes with External Quantum Efficiencies Exceeding 20 . 査読

    Suzuki K, Kubo S, Shizu K, Fukushima T, Wakamiya A, Murata Y, Adachi C, Kaji H

    Angewandte Chemie (International ed. in English)   54 ( 50 )   15231 - 15235   2015年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Triarylboron-Based Fluorescent Organic Light-Emitting Diodes with External Quantum Efficiencies Exceeding 20 &#37;
    Triarylboron compounds have attracted much attention, and found wide use as functional materials because of their electron-accepting properties arising from the vacant p orbitals on the boron atoms. In this study, we design and synthesize new donor-acceptor triarylboron emitters that show thermally activated delayed fluorescence. These emitters display sky-blue to green emission and high photoluminescence quantum yields of 87-100&#37; in host matrices. Organic light-emitting diodes using these emitting molecules as dopants exhibit high external quantum efficiencies of 14.0-22.8&#37;, which originate from efficient up-conversion from triplet to singlet states and subsequent efficient radiative decay from singlet to ground states.

    DOI: 10.1002/anie.201508270

  • Highly Stable Near-Infrared Fluorescent Organic Nanoparticles with a Large Stokes Shift for Noninvasive Long-Term Cellular Imaging 査読

    Jinfeng Zhang, Rui Chen, Zelin Zhu, Chihaya Adachi, Xiaohong Zhang, Chun-Sing Lee

    ACS APPLIED MATERIALS & INTERFACES   7 ( 47 )   26266 - 26274   2015年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Fluorescent organic nanoparticles based on small molecules have been regarded as promising candidates for bioimaging in recent years. In this study, we report a highly stable near-infrared (NIR) fluorescent organic nanoprobes based on nanoparticles of an anthraquinone derivate with strong aggregation-induced emission (AIR) characteristics and a large Stokes shift (>175 nm). These endow the nanoprobe with high fluorescent brightness and high signal-to-noise ratio. On the other hand, the nanoprobe also shows low cytotoxicity, good stability over a wide pH range, superior resistance against photodegradation and photobleaching comparing to typical commercial fluorescent organic dyes such as fluorescein sodium. Endowed with such merits in term of optical performance, biocompatibility, and stability, the nanoprobe is demonstrated to be an ideal fluorescent probe for noninvasive long-term cellular tracing and imaging applications. As an example, it is shown that strong red fluorescence from the nanoprobe can still be clearly observed in A549 human lung cancer cells after incubation for six generations over 15 days.

    DOI: 10.1021/acsami.5b08539

  • Highly efficient electroluminescence from a solution-processable thermally activated delayed fluorescence emitter 査読

    Yoshimasa Wada, Katsuyuki Shizu, Shosei Kubo, Katsuaki Suzuki, Hiroyuki Tanaka, Chihaya Adachi, Hironori Kaji

    APPLIED PHYSICS LETTERS   107 ( 18 )   2015年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We developed a thermally activated delayed fluorescence (TADF) emitter, 2,4,6-tris(4-(9,9-dimethylacridan-10-yl)phenyl)-1,3,5-triazine (3ACR-TRZ), suitable for use in solution-processed organic light-emitting diodes (OLEDs). When doped into 4,4'-bis(carbazol-9-yl) biphenyl (CBP) host at 16 wt. &#37;, 3ACR-TRZ showed a high photoluminescence quantum yield of 98&#37;. Transient photoluminescence decay measurements of the 16 wt. &#37; 3ACR-TRZ: CBP film confirmed that 3ACR-TRZ exhibits efficient TADF with a triplet-to-light conversion efficiency of 96&#37;. This high conversion efficiency makes 3ACR-TRZ attractive as an emitting dopant in OLEDs. Using 3ACR-TRZ as an emitter, we fabricated a solution-processed OLED exhibiting a maximum external quantum efficiency of 18.6&#37;. (C) 2015 AIP Publishing LLC.

    DOI: 10.1063/1.4935237

  • Highly Efficient Blue Electroluminescence Using Delayed-Fluorescence Emitters with Large Overlap Density between Luminescent and Ground States 査読

    Katsuyuki Shizu, Hiroki Noda, Hiroyuki Tanaka, Masatsugu Taneda, Motoyuki Uejima, Tohru Sato, Kazuyoshi Tanaka, Hironori Kaji, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   119 ( 47 )   26283 - 26289   2015年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The use of thermally activated delayed-fluorescence (TADF) allows the realization of highly efficient organic light-emitting diodes (OLEDs) and is a promising alternative to the use of conventional fluorescence and phosphorescence. Recent research interest has focused on blue TADF emitters. In this study, we use quantum mechanics to reveal the relationship between the molecular structures and the photophysical properties of TADF emitters and derive a direction for the molecular design of highly efficient blue TADF emitters. Theoretical analyses show that the luminescence efficiency of TADF emitters largely depends on the overlap density (rho(10)) between the electronic wave functions of the ground state and the lowest excited singlet state. By increasing rho(10), we develop an efficient sky-blue TADF emitter material, 9-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9'-phenyl-9H,9'H-3,3'-bicarbazole (BCzT). When doped into a host layer, BCzT produces a high photoluminescence quantum yield of 95.6&#37;. From the transient photoluminescence decays of the doped film, the efficiency of excited triplet state conversion into light is estimated to be 76.2&#37;. An OLED using BCzT as a sky-blue emitter produces a maximum external quantum efficiency (EQE) of 21.7&#37;, which is much higher than the EQE range of conventional fluorescent OLEDs (57.5&#37;). The high EQE is a result of the high triplet-to-light conversion efficiency of BCzT. Our material design based on rho(10) distribution provides a rational approach for developing TADF emitters for high-efficiency blue OLEDs.

    DOI: 10.1021/acs.jpcc.5b07798

  • Degradation mechanism of planar perovskite solar cells 査読

    Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi

    ORGANIC PHOTOVOLTAICS XVI   9567   2015年10月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    DOI: 10.1117/12.2187578

  • High-Efficiency Sky-Blue Organic Light-Emitting Diodes Utilizing Thermally-Activated Delayed Fluorescence 査読

    Yasuhide Hiraga, Jun-ichi Nishide, Hajime Nakanotani, Masaki Aonuma, Chihaya Adachi

    IEICE TRANSACTIONS ON ELECTRONICS   E98C ( 10 )   971 - 976   2015年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A highly efficient sky-blue organic light-emitting diode (OLED) based on a thermally-activated delayed fluorescence (TADF) molecule, 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN), was studied. The sky-blue OLED exhibited a maximum external electroluminescence quantum efficiency (eta(EQE)) of over 24.0&#37;. In addition, a white OLED using 2CzPN combined with green and orange TADF emitters showed a high eta(EQE) of 17.3&#37; with a maximum power efficiency of 52.3 lm/W and Commission Internationale de l'Eclairage coordinates of (0.32, 0.43).

    DOI: 10.1587/transele.E98.C.971

  • Light Amplification in an Organic Solid-State Film with the Aid of Triplet-to-Singlet Upconversion 査読

    Hajime Nakanotani, Taro Furukawa, Chihaya Adachi

    ADVANCED OPTICAL MATERIALS   3 ( 10 )   1381 - 1388   2015年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic laser dyes can be optically excited to achieve light amplification. The buildup of an excessive population of triplets is generally believed to limit the duration of the light amplification because of optical losses through excited-state absorption, so triplet excitons are usually eliminated by using a triplet quencher. However, destroying the triplets limits the electroluminescence efficiency of organic materials under electrical pumping and is counterproductive to realizing electrically pumped organic laser devices. Herein, light amplification is reported which constructively uses triplet states in an optically pumped organic film. In this system, the triplets are converted into singlets by reverse intersystem crossing in a "triplet harvester," and then the singlets are resonantly transferred to the singlet state of the laser dye. Since this approach permits the constructive use of triplets, not only gain-narrowed emission but also enhanced electroluminescence efficiency was observed, indicating that the threshold current density for lasing might be reduced.

    DOI: 10.1002/adom.201500236

  • Influence of deposition substrate temperature on the morphology and molecular orientation of chloroaluminum phthalocyanine films as well the performance of organic photovoltaic cells 査読

    Yan-Qiong Zheng, Jing Zhang, Fang Yang, Takeshi Komino, Bin Wei, Jianhua Zhang, Zixing Wang, Wenhong Pu, Changzhu Yang, Chihaya Adachi

    NANOTECHNOLOGY   26 ( 40 )   405202   2015年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The dependence of the morphology of neat chloroaluminum phthalocyanine (ClAlPc) films on substrate temperature (T-sub) during deposition is investigated by variable angle spectroscopic ellipsometry (VASE), x-ray diffraction (XRD), and atomic force microscopy (AFM) to obtain detailed information about the molecular orientation, phase separation, and crystallinity. AFM images indicate that both grain size and root mean square (RMS) roughness noticeably increase with T-sub both in neat and blend films. Increasing T-sub from room temperature to 420 K increases the horizontal orientation of the ClAlPc molecules with an increase of the mean molecular tilt angle from 60.13 degrees (300 K) to 65.86 degrees (420 K). The UV-vis absorption band of the corresponding films increases and the peak wavelength slightly red shifts with the T-sub increase. XRD patterns show a clear diffraction peak at T-sub over 390 K, implying the p-stacking of interconnected ClAlPc molecules at high T-sub. Planar and bulk heterojunction (BHJ) photovoltaic cells containing pristine ClAlPc films and ClAlPc: C-60 blend films fabricated at T-sub of 390 K show increases in the power conversion efficiency (eta(PCE)) of 28&#37; (eta(PCE) = 3.12&#37;) and 36&#37; (eta(PCE) = 3.58&#37;), respectively, relative to devices as-deposited at room temperature. The maximum short circuit current in BHJs is obtained at 390 K in the T-sub range from 300 K to 450 K.

    DOI: 10.1088/0957-4484/26/40/405202

  • Suppression of external quantum efficiency roll-off of nanopatterned organic-light emitting diodes at high current densities 査読

    Hiroyuki Kuwae, Atsushi Nitta, Kou Yoshida, Takashi Kasahara, Toshinori Matsushima, Munetomo Inoue, Shuichi Shoji, Jun Mizuno, Chihaya Adachi

    JOURNAL OF APPLIED PHYSICS   118 ( 15 )   2015年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We developed organic light-emitting diodes (OLEDs) with nanopatterned current flow regions using electron-beam lithography with the aim of suppressing singlet-polaron annihilation (SPA). Nanopatterns composed of lines and circles were used in the current flow regions of nano-line and nano-dot OLEDs, respectively. Excitons partially escape from the current flow regions where SPA takes place. As such, current densities where external quantum efficiencies were half of their initial values (J(0)) increased as line width and circle diameter were decreased to close to the exciton diffusion length. Circles were more efficient at enhancing exciton escape and increasing J(0) than lines. The J(0) increase in the nano-dot OLEDs containing nanopatterned circles with a diameter of 50 nm was approximately 41-fold that of a conventional OLED with a current flow region of 4 mm(2). The dependence of J(0) on the size and shape of the nanopatterns was well explained by an SPA model that considered exciton diffusion. Nanopatterning of OLEDs is a feasible method of obtaining large J(0). (C) 2015 AIP Publishing LLC.

    DOI: 10.1063/1.4932139

  • Purely organic electroluminescent material realizing 100&#37; conversion from electricity to light 査読

    Hironori Kaji, Hajime Suzuki, Tatsuya Fukushima, Katsuyuki Shizu, Katsuaki Suzuki, Shosei Kubo, Takeshi Komino, Hajime Oiwa, Furitsu Suzuki, Atsushi Wakamiya, Yasujiro Murata, Chihaya Adachi

    NATURE COMMUNICATIONS   6   8476   2015年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Efficient organic light-emitting diodes have been developed using emitters containing rare metals, such as platinum and iridium complexes. However, there is an urgent need to develop emitters composed of more abundant materials. Here we show a thermally activated delayed fluorescence material for organic light-emitting diodes, which realizes both approximately 100&#37; photoluminescence quantum yield and approximately 100&#37; up-conversion of the triplet to singlet excited state. The material contains electron-donating diphenylamin-ocarbazole and electron-accepting triphenyltriazine moieties. The typical trade-off between effective emission and triplet-to-singlet up-conversion is overcome by fine-tuning the highest occupied molecular orbital and lowest unoccupied molecular orbital distributions. The nearly zero singlet-triplet energy gap, smaller than the thermal energy at room temperature, results in an organic light-emitting diode with external quantum efficiency of 29.6&#37;. An external quantum efficiency of 41.5&#37; is obtained when using an out-coupling sheet. The external quantum efficiency is 30.7&#37; even at a high luminance of 3,000 cdm(-2).

    DOI: 10.1038/ncomms9476

  • Degradation Mechanisms of Organic Light-Emitting Diodes Based on Thermally Activated Delayed Fluorescence Molecules 査読

    Atula S. D. Sandanayaka, Toshinori Matsushima, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   119 ( 42 )   23845 - 23851   2015年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Degradation of organic light-emitting diodes (OLEDs) operated continuously at a constant current density is investigated using photoluminescence techniques. The OLEDs contained the thermally activated delayed fluorescence emitting dopant (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN). OLED degradation proceeds mainly on the basis of excited-state instability of host molecules rather than processes related to 4CzIPN. Additionally, the electrochemical instability of radical cations and anions influences long-term OLED degradation. The formation of exciton quenchers and nonradiative carrier recombination centers acts to reduce OLED luminance. These findings highlight the need for new host material development to fabricate more stable TADF-OLEDs.

    DOI: 10.1021/acs.jpcc.5b07084

  • Organic Light-Emitting Diodes: Multiscale Charge Transport Simulation and Fabrication of New Thermally Activated Delayed Fluorescence (TADF) Materials 査読

    Hironori Kaji, Katsuyuki Shizu, Furitsu Suzuki, Tatsuya Fukushima, Katsuaki Suzuki, Chihaya Adachi

    ORGANIC LIGHT EMITTING MATERIALS AND DEVICES XIX   9566   2015年9月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    Charge transports in amorphous thin films with 100 nm thickness are investigated in silico by explicitly considering organic molecules. The amorphous layer of organic molecules was constructed using molecular dynamics simulations. The rate constants for charge hopping between two organic molecules, extracted from the amorphous layers, were calculated based on quantum chemical calculations. The hopping transport in amorphous layers was simulated using a Monte Carlo method. The hole mobility was calculated to be several times larger than the electron mobility, which was consistent with the experimental results. The Monte Carlo simulation also shows that diffusion transport is dominant at low applied electric fields and that contribution of drift transport increases at high electric fields. The simulation in this study enables us to reveal molecular origin of charge transport. In the presentation, we will show the results on recently-developed new thermally activated delayed fluorescence materials and the device performances.

    DOI: 10.1117/12.2189078

  • Organic light-emitting diodes (OLEDs): Materials, photophysics, and device physics 査読

    Chihaya Adachi, Saeyoun Lee, Tetsuya Nakagawa, Katsuyuki Shizu, Kenichi Goushi, Takuma Yasuda, William J. Potscavage

    Organic Electronics Materials and Devices   43 - 73   2015年9月

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    記述言語:英語  

    Currently, organic light-emitting diodes (OLEDs) have reached the stage of commercialization, and there has been an intense drive to use them in various applications from small-and medium-sized mobile devices to illumination equipment and large television screens. In particular, room-temperature phosphorescent materials have become core OLED components as alternatives to conventionally used fluorescent materials because devices made with phosphorescent materials exhibit excellent light-emitting performance with internal electroluminescence efficiencies (ηint) of nearly 100 &#37;. However, phosphorescent materials have several intrinsic problems, such as being limited to metal-organic compounds containing rare metals, for example, Ir, Pt, Au, and Os, and difficulty in realizing stable blue light emission. As a result, researchers have attempted to develop new materials for use as emissive dopants in OLEDs that overcome these limitations. In this chapter, first we briefly review the progress of OLED materials and device architectures mainly based on fluorescent (first-generation) and phosphorescent (secondgeneration) emitters. Then, we discuss third-generation OLEDs that use a new light-emitting mechanism called thermally activated delayed fluorescence (TADF). Recently, highly efficient TADF, which had been difficult to realize with conventional molecular design, has been achieved by very sophisticated molecular structures, allowing access to the unlimited freedom of molecular design using carbon-based materials. This has led to the production of ultimate OLEDs that are made of common organic compounds without precious metals and can convert electricity to light at ηint of nearly 100 &#37;.

    DOI: 10.1007/978-4-431-55654-1_2

  • Vacuum-and-solvent-free fabrication of organic semiconductor layers for field-effect transistors 査読

    Toshinori Matsushima, Atula S. D. Sandanayaka, Yu Esaki, Chihaya Adachi

    SCIENTIFIC REPORTS   5   14547   2015年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate that cold and hot isostatic pressing (CIP and HIP) is a novel, alternative method for organic semiconductor layer fabrication, where organic powder is compressed into a layer shape directly on a substrate with 200 MPa pressure. Spatial gaps between powder particles and the other particles, substrates, or electrodes are crushed after CIP and HIP, making it possible to operate organic field-effect transistors (OFETs) containing the compressed powder as the semiconductor. The CIP-compressed powder of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) had a hole mobility of (1.6 +/- 0.4) x 10(-2) cm(2)/Vs. HIP of C8-BTBT powder increased the hole mobility to an amorphous silicon-like value (0.22 +/- 0.07 cm(2)/Vs) because of the growth of the C8-BTBT crystallites and the improved continuity between the powder particles. The vacuum and solution processes are not involved in our CIP and HIP techniques, offering a possibility of manufacturing OFETs at low cost.

    DOI: 10.1038/srep14547

  • Organic Light-emitting Diodes Based on Donor-substituted Phthalimide and Maleimide Fluorophores 査読

    Myung Eun Jang, Takuma Yasuda, Jiyoung Lee, Sae Youn Lee, Chihaya Adachi

    CHEMISTRY LETTERS   44 ( 9 )   1248 - 1250   2015年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Highly luminescent phthalimide- and maleimide-based molecules having donor acceptor donor electronic configurations have been developed. A phthalimide-based material exhibited highly efficient green delayed fluorescence owing to its small singlet triplet energy gap. An organic light-emitting diode using the molecules as an emitter exhibited a high maximum external electroluminescence quantum efficiency of 11.5&#37;, which exceeds those obtained with common fluorescent emitters.

    DOI: 10.1246/cl.150454

  • Improvement in the light outcoupling efficiency of organic light-emitting diodes using a hemispherical lens and a multipatterned one-dimensional photonic crystal fabricated by autocloning 査読

    Hiroshi Fujimoto, Masayuki Yahiro, Takayuki Kawashima, Keisuke Konno, Qiang Chen, Kunio Sawaya, Shojiro Kawakami, Chihaya Adachi

    APPLIED PHYSICS EXPRESS   8 ( 8 )   2015年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The outcoupling efficiency of organic light-emitting diodes was improved using a photonic crystal fabricated by autocloning, which has potential advantages for mass production. By using layer thicknesses optimized by optical simulations, the experimental external quantum efficiency of a device with the photonic crystal and a hemispherical lens was 43.4&#37;, which is 2.13 times that of a device on a flat substrate without the lens. Comparisons with the simulated distributions of the light modes in the devices show that the photonic crystal reduces the light loss from the waveguide and evanescent modes. The emission pattern was independent of substrate rotation. (C) 2015 The Japan Society of Applied Physics

    DOI: 10.7567/APEX.8.082102

  • Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy 査読

    Tatsuya Fukushima, Junichi Yamamoto, Masashi Fukuchi, Shuzo Hirata, Heo Hyo Jung, Osamu Hirata, Yuki Shibano, Chihaya Adachi, Hironori Kaji

    AIP ADVANCES   5 ( 8 )   2015年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Liquid organic light-emitting diodes (liquid OLEDs) are unique devices consisting only of liquid organic semiconductors in the active layer, and the device performances have been investigated recently. However, the device degradation, especially, the origin has been unknown. In this study, we show that material degradation occurs in liquid OLEDs, whose active layer is composed of carbazole with an ethylene glycol chain. Nuclear magnetic resonance (NMR) experiments clearly exhibit that the dimerization reaction of carbazole moiety occurs in the liquid OLEDs during driving the devices. In contrast, cleavages of the ethylene glycol chain are not detected within experimental error. The dimerization reaction is considered to be related to the device degradation. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

    DOI: 10.1063/1.4928515

  • Morphological control of organic-inorganic perovskite layers by hot isostatic pressing for efficient planar solar cells 査読

    Toshinori Matsushima, Takashi Fujihara, Chuanjiang Qin, Shinobu Terakawa, Yu Esaki, Sunbin Hwang, Atula S.D. Sandanayaka, William J. Potscavage, Chihaya Adachi

    Journal of Materials Chemistry A   3 ( 34 )   17780 - 17787   2015年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Morphological control of organic-inorganic perovskite layers is crucial for efficient planar solar cells. In this study, we show that hot isostatic pressing (HIP) of perovskite layers using a pressure of 200 MPa in 90°C water is very effective for improving the perovskite film morphology. After HIP treatment, undesirable pin holes and spatial gaps between crystals in the perovskite layers were significantly reduced. Improved crystallinity and enhanced diffusion lengths for both electrons and holes were also confirmed in the HIP-treated perovskite layers. Solar cells containing the perovskite layers as light absorbers were fabricated and characterized under simulated solar light (AM1.5G, 100 mW cm-2). The HIP treatment induced a marked enhancement of short-circuit current density, open-circuit voltage, fill factor, and power conversion efficiency because of the improved morphology and crystallinity and enhanced carrier diffusion. The HIP-treated solar cells achieved efficiencies of 10.6 ± 0.7%, which are about 1.5 times higher than those of the untreated solar cells (7.20 ± 0.59%).

    DOI: 10.1039/c5ta03796d

  • Comparison of transient state and steady state exciton-exciton annihilation rates based on Forster-type energy transfer 査読

    Toshiya Yonehara, Kenichi Goushi, Tomoaki Sawabe, Isao Takasu, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS   54 ( 7 )   2015年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We investigated differences between the transient state and steady state exciton-exciton annihilation rates based on Forster-type energy transfer. The exciton-exciton annihilation rate of an organic semiconductor is usually determined by transient state photoluminescence measurements using a pulsed laser or steady state photoluminescence measurements using a continuous wave laser. However, it is unclear that the respective annihilation rates determined by their rate equations are the same. In calculations with platinum-octaethylporphyrin (PtOEP) parameters, Monte Carlo simulations gave two different annihilation rates for the transient state and the steady state. The analytical models based on Forster-type energy transfer also showed the same result. These results indicate that the exciton-exciton annihilation rates in transient state and steady state are distinguished. (C) 2015 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.54.071601

  • Uniform Aerosol Jet printed polymer lines with 30 mu m width for 140 ppi resolution RGB organic light emitting diodes 査読

    Jeffrey G. Tait, Ewelina Witkowska, Masaya Hirade, Tung-Huei Ke, Pawel E. Malinowski, Soeren Steudel, Chihaya Adachi, Paul Heremans

    ORGANIC ELECTRONICS   22   40 - 43   2015年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate the patterning of top emitting organic light emitting diodes (OLEDs) by direct-write Aerosol Jet printing in air from non-halogenated solvents. Indane was determined to be a suitable single solvent to dissolve the archetypal host poly(N-vinylcarbazole) and guest emitting dopants complexes for red, green, and blue OLEDs, and to print on both PEDOT:PSS and MoO3 transport layers. The Aerosol Jet deposition parameters were studied, including: atomization flow rate, exhaust flow rate, focusing sheath flow rate, nozzle-to-substrate distance, nozzle speed, and substrate temperature. A line width of 30 mu m and thickness of 30 nm was achieved, resulting in RGB OLEDs fabricated side-by-side with a pixel density of 140 ppi. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2015.03.034

  • Tetraphenyldibenzoperiflanthene as sensitizer for enhancing the performance in dinaphthothienothiophene-based photovoltaics with and without fullerene 査読

    Yan-qiong Zheng, William J. Potscavage, Jing Zhang, Takuma Yasuda, Bin Wei, Chihaya Adachi

    SYNTHETIC METALS   205   121 - 126   2015年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this work, various interlayers were inserted between the donor and acceptor in a dinaphthothienothiophene (DN'FF)/C-60 planar heterojunction (PHJ) to sensitize the performance. The power conversion efficiency is enhanced from 1.16&#37; for the DNTT/C-60 PHJ cell to 2.23&#37; by inserting a 5-nm-thick tetraphenyldibenzoperifianthene (DBP) interlayer because of the greatly improved photocurrent and open-circuit voltage (Voc). To achieve high Voc, fullerene-free PHJs of DNTT/boron subphthalocyanine chloride (SubPc) (donor/acceptor) were fabricated, and Voc is further improved by doping various fractions of DBP into the SubPc layer. The Voc clearly increases from 0.82V to 1.24V by 70 wt&#37;-DBP doping and is accompanied by a slight increase in photocurrent. The bipolar transfer characteristics of SubPc and DBP are investigated by field-effect transistors and show that both can transport electrons, indicating their potential as acceptors in photovoltaic devices. When another 5-nm-thick SubPc layer was included in the fullerene-free DNTF/SubPc:DBP PHJ cell, the power conversion efficiency further increases to 1.32&#37;. These results indicate that DBP is a promising sensitizer for enhancing the performance of DNIT-based photovoltaics. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.synthmet.2015.04.002

  • Highly efficient electroluminescence from purely organic donor-acceptor systems 査読

    Katsuyuki Shizu, Jiyoung Lee, Hiroyuki Tanaka, Hiroko Nomura, Takuma Yasuda, Hironori Kaji, Chihaya Adachi

    PURE AND APPLIED CHEMISTRY   87 ( 7 )   627 - 638   2015年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermally activated delayed fluorescence (TADF) emitters are third-generation electroluminescent materials that realize highly efficient organic light-emitting diodes (OLEDs) without using rare metals. Here, after briefly reviewing the principles of TADF and its use in OLEDs, we report a sky-blue TADF emitter, 9-(4-(benzo[d] thiazol-2-yl) phenyl)-N-3, N-3, N-6, N-6-tetraphenyl-9H-carbazole-3,6-diamine (DAC-BTZ). DAC-BTZ is a purely organic donor-acceptor-type molecule with a small energy difference between its lowest excited singlet state and lowest triplet state of 0.18-0.22 eV according to fluorescence and phosphorescence spectra of a DAC-BTZ-doped film. In addition, the doped film exhibits a high photoluminescence quantum yield of 0.82. Time-resolved photoluminescence measurements of the doped film confirm that DAC-BTZ emits TADF. An OLED containing DAC-BTZ as an emitter exhibits a maximum external quantum efficiency (EQE) of 10.3 &#37;, which exceeds those obtained with conventional fluorescent emitters (5-7.5 &#37;). TADF from DAC-BTZ makes a large contribution to the high EQE of its OLED.

    DOI: 10.1515/pac-2015-0301

  • Morphological control of organic-inorganic perovskite layers by hot isostatic pressing for efficient planar solar cells 査読 国際誌

    Toshinori Matsushima; Takashi Fujihara; Chuanjiang Qin; Shinobu Terakawa; Yu Esaki; Sunbin Hwang; Atula S. D. Sandanayaka; William J. Potscavage, Jr.; Chihaya Adachi

    J. Mater. Chem. A   3   17780 - 17787   2015年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C5TA03796D

  • Fabrication of a Portable Electrochemiluminescence-induced Fluorescence Detection Chip with Microfluidic Excitation Source for Point-of-care Diagnostics 査読 国際誌

    Miho Tsuwaki, Takashi Kasahara, Tomohiko Edura, Juro Oshima, Eri Kunisawa, Ryoichi Ishimatsu, Shigeyuki Matsunami, Toshihiko Imato, Chihaya Adachi, Shuichi Shoji, Jun Mizuno

    IEEJ Transactions on Sensors and Micromachines   135 ( 6 )   230 - 235   2015年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1541/ieejsmas.135.230

  • Large-Area Deposition Technology of High Purity Organic Thin Film by Gas Flow Deposition 査読 国際誌

    Tomohiko EDURA, Kohei TSUGITA, Chihaya ADACHI

    Journal of the Vacuum Society of Japan   58 ( 3 )   79 - 85   2015年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3131/jvsj2.58.79

  • High efficiency pure blue thermally activated delayed fluorescence molecules having 10H-phenoxaborin and acridan units 査読 国際誌

    Masaki Numata; Takuma Yasuda; Chihaya Adachi

    Chem. Comm.   51 ( 46 )   9443 - 9446   2015年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C5CC00307E

  • Laser-Induced Micro-Patterning of Organic Semiconductor Layers for Use in Organic Light-Emitting Diode Displays 査読

    Masahiro Misaki, Asami Toba, Daisuke Goto, Chihaya Adachi, Yasuko Koshiba, Kenji Ishida, Yasukiyo Ueda

    ITE Transactions on Media Technology and Applications (MTA)   3 ( 2 )   143 - 148   2015年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Laser-Induced Micro-Patterning of Organic Semiconductor Layers for Use in Organic Light-Emitting Diode Displays

  • Exciton Quenching Behavior of Thermally Activated Delayed Fluorescence Molecules by Charge Carriers 査読

    Atula S. D. Sandanayaka, Kou Yoshida, Toshinori Matsushima, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   119 ( 14 )   7631 - 7636   2015年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The quenching of singlet excitons by injected charge carriers in molecules that display thermally activated delayed fluorescence (TADF) was investigated using time-resolved transient photoluminescence (PL) techniques. Injected electrons did not affect the excitons; however, injected holes caused significant quenching. Using a rate-equation analysis, the hole-induced exciton quenching rate was determined to be between 10(-11) and 10(-12) cm(3) s(-1). Interestingly, the TADF emission component was enhanced in the presence of injected holes, plausibly due to a reduction of the singlet-exciton energy level.

    DOI: 10.1021/acs.jpcc.5b01314

  • Highly efficient blue electroluminescence based on thermally activated delayed fluorescence 査読

    Shuzo Hirata, Yumi Sakai, Kensuke Masui, Hiroyuki Tanaka, Sae Youn Lee, Hiroko Nomura, Nozomi Nakamura, Mao Yasumatsu, Hajime Nakanotani, Qisheng Zhang, Katsuyuki Shizu, Hiroshi Miyazaki, Chihaya Adachi

    NATURE MATERIALS   14 ( 3 )   330 - 336   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic compounds that exhibit highly efficient, stable blue emission are required to realize inexpensive organic light-emitting diodes for future displays and lighting applications. Here, we define the design rules for increasing the electroluminescence efficiency of blue-emitting organic molecules that exhibit thermally activated delayed fluorescence. We show that a large delocalization of the highest occupied molecular orbital and lowest unoccupied molecular orbital in these charge-transfer compounds enhances the rate of radiative decay considerably by inducing a large oscillator strength even when there is a small overlap between the two wavefunctions. A compound based on our design principles exhibited a high rate of fluorescence decay and efficient up-conversion of triplet excitons into singlet excited states, leading to both photoluminescence and internal electroluminescence quantum yields of nearly 100&#37;.

    DOI: 10.1038/NMAT4154

  • Fluorometric flow-immunoassay for alkylphenol polyethoxylates on a microchip containing a fluorescence detector comprised of an organic light emitting diode and an organic photodiode 査読

    Rong Liu, Ryoichi Ishimatsu, Masayuki Yahiro, Chihaya Adachi, Koji Nakano, Toshihiko Imato

    TALANTA   134   37 - 47   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A compact fluorescence detector was constructed on a microchip from an organic light emitting diode (OLED) as the light source and an organic photodiode (OPD) as the photo-detector and was used in an immunoassay for allcylphenol polyethoxylates (APE). The OLED based on a terbium complex emitted a sharp light at the main wavelength of 546 nm with a full width at half maximum of 9 nm. The incident photo-to-current conversion efficiency (IPCE) of the OPD fabricated with Fullerene 70(C-70) and tris[4-(5phenylthiopen-2-yephenyll-amine (TPTPA) was approximately 44&#37; for light at a wavelength of 586 nm. The performance of the fluorescence detector was evaluated for the determination of resorufin (lambda(em)= 586 nm) and the photocurrent of the OPD due to the fluorescence of resorufin was proportional to the concentration of resorufin in the range from 0 to 18 mu M with a detection limit (S/N=3) of 0.6 mu M. The fluorescence detector was successfully utilized in a competitive enzyme-linked immunosorbent assay for APE, where an anti-APE antibody was immobilized on the surface of the channel of the Polydimethylsiloxane (PDMS) microchip or on the surface of magnetic microbeads. After an immunoreaction with a sample solution of APE containing a horse radish peroxidase (HRP)-labeled APE, the fluorescence of resorufin generated just after introduction of a mixed solution of Amplex Red and H2O2 was measured using the fluorescence detector. The calibration curve for the photocurrent signals of the OPD due to the fluorescence of resorufin against the logarithmic concentration of APE was sigmoidal in shape. The detection limits defined as IC80 were ca. 1 ppb and ca. 2 ppb, respectively, for the methods using the anti-APE antibody immobilized on the surface of the microchannel and in the case where the antibody was immobilized on the surface of magnetic microbeads. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.talanta.2014.10.055

  • Influence of the atmosphere on organic-organic interfacial layers and deterioration in organic light-emitting diodes 査読

    Hirofumi Nakamura, Seong-Hee Noh, Miki Kuribayashi, Chihaya Adachi

    JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY   23 ( 3 )   129 - 137   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The influence of organic-organic interfacial contaminants and deterioration in organic light-emitting diodes (OLEDs) was investigated. There was deterioration of the device characteristics when atmospheric contamination was introduced to the emission site. We simultaneously observed a decrease of the maximum capacitance, C-max, of the OLEDs, implying that there was charge accumulation at the interface. Our study demonstrates that maintaining the interface adjacent to emission site free from contaminants is crucial to protect the device from deterioration.

    DOI: 10.1002/jsid.318

  • Highly efficient blue electroluminescence based on thermally activated delayed fluorescence 査読

    Shuzo Hirata, Yumi Sakai, Kensuke Masui, Hiroyuki Tanaka, Sae Youn Lee, Hiroko Nomura, Nozomi Nakamura, Mao Yasumatsu, Hajime Nakanotani, Qisheng Zhang, Katsuyuki Shizu, Hiroshi Miyazaki, Chihaya Adachi

    NATURE MATERIALS   14 ( 3 )   330 - 336   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic compounds that exhibit highly efficient, stable blue emission are required to realize inexpensive organic light-emitting diodes for future displays and lighting applications. Here, we define the design rules for increasing the electroluminescence efficiency of blue-emitting organic molecules that exhibit thermally activated delayed fluorescence. We show that a large delocalization of the highest occupied molecular orbital and lowest unoccupied molecular orbital in these charge-transfer compounds enhances the rate of radiative decay considerably by inducing a large oscillator strength even when there is a small overlap between the two wavefunctions. A compound based on our design principles exhibited a high rate of fluorescence decay and efficient up-conversion of triplet excitons into singlet excited states, leading to both photoluminescence and internal electroluminescence quantum yields of nearly 100&#37;.

    DOI: 10.1038/NMAT4154

  • Nearly 100&#37; Internal Quantum Efficiency in Undoped Electroluminescent Devices Employing Pure Organic Emitters 査読

    Qisheng Zhang, Daniel Tsang, Hirokazu Kuwabara, Yasuhiro Hatae, Bo Li, Takehiro Takahashi, Sae Youn Lee, Takuma Yasuda, Chihaya Adachi

    ADVANCED MATERIALS   27 ( 12 )   2096 - 2100   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The design of efficient and concentration-insensitive metal-free thermally activateddelayed fluorescence (TADF) materials is reported. Blue and green organic light-emitting diodes (OLEDs) containing a hole-transport layer, an undoped TADF emissive layer, and an electron-transport layer achieve maximum external quantum efficiencies of 19&#37;, which is comparable to the best doped OLEDs.

    DOI: 10.1002/adma.201405474

  • High-Efficiency White Organic Light-Emitting Diodes Based on a Blue Thermally Activated Delayed Fluorescent Emitter Combined with Green and Red Fluorescent Emitters 査読

    Takahiro Higuchi, Hajime Nakanotani, Chihaya Adachi

    ADVANCED MATERIALS   27 ( 12 )   2019 - 2023   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A new device architecture for highly efficient white organic light-emitting diodes is proposed, using a molecule exhibiting blue thermally activated delayed fluorescence as a common source of singlet excitons for molecules emitting red and green light based on conventional fluorescence. The device, with an optimum combination of materials, shows a maximum external quantum efficiency of over 12&#37; without using phosphorescent emitters.

    DOI: 10.1002/adma.201404967

  • Introduction of oxygen into organic thin films with the aim of suppressing singlet-triplet annihilation 査読

    Munetomo Inoue, Toshinori Matsushima, Hajime Nakanotani, Chihaya Adachi

    CHEMICAL PHYSICS LETTERS   624   43 - 46   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Efficient introduction of oxygen into a solid-state organic film is demonstrated by applying a high oxygen pressure of 200 MPa to the film. The oxygen-introduced film shows strong suppression of singlet-triplet annihilation (STA) because triplet excitons are quenched by oxygen introduced inside the film. It is demonstrated that oxygen molecules are uniformly distributed in the film and that oxygen molecules are left in the film to some extent when the film is in a vacuum. The concentration of oxygen inside the film is calculated to be a very high value on the order of 4.4 x 10(20) cm(-3). (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2015.02.010

  • Suppression of roll-off characteristics of organic light-emitting diodes by narrowing current injection/transport area to 50 nm 査読

    Kyohei Hayashi, Hajime Nakanotani, Munetomo Inoue, Kou Yoshida, Oleksandr Mikhnenko, Thuc-Quyen Nguyen, Chihaya Adachi

    APPLIED PHYSICS LETTERS   106 ( 9 )   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Using e-beam nanolithography, the current injection/transport area in organic light-emitting diodes (OLEDs) was confined into a narrow linear structure with a minimum width of 50 nm. This caused suppression of Joule heating and partial separation of polarons and excitons, so the charge density where the electroluminescent efficiency decays to the half of the initial value (J(0)) was significantly improved. A device with a narrow current injection width of 50 nm exhibited a J(0) that was almost two orders of magnitude higher compared with that of the unpatterned OLED. (C) 2015 AIP Publishing LLC.

    DOI: 10.1063/1.4913461

  • Highly Efficient Thermally Activated Delayed Fluorescence Emitters with a Small Singlet-Triplet Energy Gap and Large Oscillator Strength 査読

    Yuta Sagara, Katsuyuki Shizu, Hiroyuki Tanaka, Hiroshi Miyazaki, Kenichi Goushi, Hironori Kaji, Chihaya Adachi

    CHEMISTRY LETTERS   44 ( 3 )   360 - 362   2015年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A strategy for designing highly efficient thermally activated delayed fluorescence (TADF) emitters was reported. TADF emitters with donor-acceptor-donor (D-A-D)-type structures showed highly efficient TADF because of their small singlet-triplet energy gap and large oscillator strength. An organic light-emitting diode containing a D-A-D-type TADF emitter, cis-BOX2, exhibited a high external electroluminescence quantum efficiency of 17.6&#37;.

    DOI: 10.1246/cl.141054

  • Charge carrier dynamics and degradation phenomena in organic light-emitting diodes doped by a thermally activated delayed fluorescence emitter 査読

    Yutaka Noguchi, Hyung-Jun Kim, Ryuta Ishino, Kenichi Goushi, Chihaya Adachi, Yasuo Nakayama, Hisao Ishii

    ORGANIC ELECTRONICS   17   184 - 191   2015年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report on the charge carrier dynamics and their degradation phenomena in an organic light-emitting diode (OLED) doped by a thermally activated delayed fluorescence emitter; (4s, 6s)-2,4,5,6-tetra(9H-carbazol-9-yl) isophthalonitrile (4CzIPN). Displacement current measurement (DCM) data revealed the presence of negative interface charge originating from the spontaneous orientation polarization of the electron transport layer (ETL), 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl) benzene. The negative interface charge acts as a hole reservoir and thus confines the recombination zone near the emission layer (EML); 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP):4CzIPN (5 wt&#37;)/ETL interface. By keeping the recombination zone far from the hole transport layer, 4,40-bis[N-(1-naphthyl)-N-phenylamino]- biphenyl (alpha-NPD), a better electroluminescence efficiency is expected because the Dexter energy transfer from the triplet state of 4CzIPN to that of alpha-NPD is suppressed. Moreover, we found an excellent linear relation between the accumulated hole amount and luminance losses owing to device aging. The results are consistent with hole traps originating at the degradation products of CBP as the main factor of device degradation. We suggest device architectures based on the charge carrier dynamics for better efficiency and lifetime. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2014.12.009

  • Ambipolar organic field-effect transistors based on solution-processed single crystal microwires of a quinoidal oligothiophene derivative 査読 国際誌

    J. C. Ribierre; L. Zhao; S. Furukawa; T. Kikitsu; D. Inoue; A. Muranaka; K. Takaishi; T. Muto; S. Matsumoto; D. Hashizume; M. Uchiyama; P. André; C. Adachi; T. Aoyama

    Chem. Comm.   51 ( 27 )   5836 - 5839   2015年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C4CC09608H

  • Charge carrier dynamics and degradation phenomena in organic light-emitting diodes doped by a thermally activated delayed fluorescence emitter 査読

    Yutaka Noguchi, Hyung-Jun Kim, Ryuta Ishino, Kenichi Goushi, Chihaya Adachi, Yasuo Nakayama, Hisao Ishii

    ORGANIC ELECTRONICS   17   184 - 191   2015年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report on the charge carrier dynamics and their degradation phenomena in an organic light-emitting diode (OLED) doped by a thermally activated delayed fluorescence emitter; (4s, 6s)-2,4,5,6-tetra(9H-carbazol-9-yl) isophthalonitrile (4CzIPN). Displacement current measurement (DCM) data revealed the presence of negative interface charge originating from the spontaneous orientation polarization of the electron transport layer (ETL), 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl) benzene. The negative interface charge acts as a hole reservoir and thus confines the recombination zone near the emission layer (EML); 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP):4CzIPN (5 wt&#37;)/ETL interface. By keeping the recombination zone far from the hole transport layer, 4,40-bis[N-(1-naphthyl)-N-phenylamino]- biphenyl (alpha-NPD), a better electroluminescence efficiency is expected because the Dexter energy transfer from the triplet state of 4CzIPN to that of alpha-NPD is suppressed. Moreover, we found an excellent linear relation between the accumulated hole amount and luminance losses owing to device aging. The results are consistent with hole traps originating at the degradation products of CBP as the main factor of device degradation. We suggest device architectures based on the charge carrier dynamics for better efficiency and lifetime. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2014.12.009

  • Dual enhancement of electroluminescence efficiency and operational stability by rapid upconversion of triplet excitons in OLEDs 査読

    Taro Furukawa, Hajime Nakanotani, Munetomo Inoue, Chihaya Adachi

    SCIENTIFIC REPORTS   5   8429   2015年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Recently, triplet harvesting via a thermally activated delayed fluorescence (TADF) process has been established as a realistic route for obtaining ultimate internal electroluminescence (EL) quantum efficiency in organic light-emitting diodes (OLEDs). However, the possibility that the rather long transient lifetime of the triplet excited states would reduce operational stability due to an increased chance for unwarranted chemical reactions has been a concern. Herein, we demonstrate dual enhancement of EL efficiency and operational stability in OLEDs by employing a TADF molecule as an assistant dopant and a fluorescent molecule as an end emitter. The proper combination of assistant dopant and emitter molecules realized a "one-way'' rapid Forster energy transfer of singlet excitons from TADF molecules to fluorescent emitters, reducing the number of cycles of intersystem crossing (ISC) and reverse ISC in the TADF molecules and resulting in a significant enhancement of operational stability compared to OLEDs with a TADF molecule as the end emitter. In addition, we found that the presence of this rapid energy transfer significantly suppresses singlet-triplet annihilation. Using this finely-tuned rapid triplet-exciton upconversion scheme, OLED performance and lifetime was greatly improved.

    DOI: 10.1038/srep08429

  • Horizontal molecular orientation in solution-processed organic light-emitting diodes 査読

    L. Zhao, T. Komino, M. Inoue, J. -H. Kim, J. C. Ribierre, C. Adachi

    APPLIED PHYSICS LETTERS   106 ( 6 )   2015年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Horizontal orientation of the emission transition dipole moments achieved in glassy vapor-deposited organic thin films leads to an enhancement of the light out-coupling efficiency in organic light-emitting diodes (OLEDs). Here, our combined study of variable angle spectroscopic ellipsometry and angle dependent photoluminescence demonstrates that such a horizontal orientation can be achieved in glassy spin-coated organic films based on a composite blend of a heptafluorene derivative as a dopant and a 4,4'-bis(N-carbazolyl)-1,1'-biphenyl as a host. Solution-processed fluorescent OLEDs with horizontally oriented heptafluorene emitters were then fabricated and emitted deep blue electroluminescence with an external quantum efficiency as high as 5.3&#37;. (C) 2015 AIP Publishing LLC.

    DOI: 10.1063/1.4907890

  • Multi-color microfluidic organic light-emitting diodes based on on-demand emitting layers of pyrene-based liquid organic semiconductors with fluorescent guest dopants 査読

    Takashi Kasahara, Shigeyuki Matsunami, Tomohiko Edura, Ryoichi Ishimatsu, Juro Oshima, Miho Tsuwaki, Toshihiko Imato, Shuichi Shoji, Chihaya Adachi, Jun Mizuno

    SENSORS AND ACTUATORS B-CHEMICAL   207   481 - 489   2015年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this study, we propose on-demand multi-color microfluidic organic light-emitting diodes (microfluidic OLEDs) using fluorescent guest emitter-doped liquid organic semiconductors. We use 1-pyrenebutyric acid 2-ethylhexyl ester (PLQ) not only for a greenish-blue liquid emitter, but also for a liquid host. 5,12-Diphenyltetracene (DPT), 5,6,11,12-tetraphenyltetracene (rubrene), and tetraphenyldibenzoperiflanthene (DBP) are doped into PLQ to obtain green, yellow, and red liquid emitters, respectively. Single-micrometer-thick SU-8-based microchannels sandwiched between an indium tin oxide (ITO) anode and a 3-aminopropyltriethoxysilane (APTES)-modified ITO cathode are fabricated on a glass substrate using photolithography and heterogeneous bonding techniques, and emitting layers are formed on-demand by simply injecting liquid emitters into the target microchannels. The microfluidic OLEDs with liquid emitters successfully exhibited multi-color electroluminescence (EL) emissions. Furthermore, the maximum luminance reached 26.0 cd/m(2) at 61 V for 2.5-mu m-thick microfluidic OLED with PLQ, and the decreased EL luminance was recovered by replacing the degraded emitting layer with a fresh liquid emitter. We expect that on-demand multi-color EL emissions and refreshable luminance features of the proposed microfluidic OLEDs will be highly promising technologies for future long-life light-emitting device applications. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.snb.2014.09.101

  • Tunable and flexible solvent-free liquid organic distributed feedback lasers 査読

    Ju-Hyung Kim, Munetomo Inoue, Li Zhao, Takeshi Komino, Soonmin Seo, Jean-Charles Ribierre, Chihaya Adachi

    APPLIED PHYSICS LETTERS   106 ( 5 )   2015年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report on optically pumped blue, green, and red liquid organic distributed feedback (DFB) lasers based on solvent-free fluidic organic semiconductors, and prepared on highly flexible corrugated polymeric patterns. By the appropriate selection of laser dyes doping a liquid 9-(2-ethylhexyl) carbazole host, the lasing wavelength is effectively tuned across the visible spectrum via a cascade energy transfer scheme. We also demonstrate a mechanical tunability of the flexible liquid DFB laser emission, which is due to the deformation of the high-aspect ratio DFB grating under bending. Overall, this work provides an important step in the development of flexible liquid organic optoelectronic devices. (C) 2015 AIP Publishing LLC.

    DOI: 10.1063/1.4907323

  • Effect of Atom Substitution in Chalcogenodiazole-Containing Thermally Activated Delayed Fluorescence Emitters on Radiationless Transition 査読

    Hiroyuki Tanaka, Katsuyuld Shizu, Jiyoung Lee, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   119 ( 6 )   2948 - 2955   2015年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Radiationless transition between the lowest singlet (S-1) and triplet (T1) excited states in the thermally activated delayed fluorescence (TADF) were investigated with respect to molecular design. The photophysical, transient photoluminescence and electroluminescence (EL) characteristics of two chalcogenodiazole-containing TADF emitters were compared. These contained 1,3,4-oxadiazole or 1,3,4-thiadiazole. The effect of substituting oxygen with sulfur on TADF was caused by an electron-pair-accepting conjugative effect. This effect resulted from the vacant 3d-orbitals of divalent sulfur in the thiadiazole heteroring. Atom substitution narrowed the gap between the highest occupied and lowest unoccupied molecular orbital energy levels, and enhanced S-1 -> T-1 intersystem crossing. These effects resulted from the enhanced acceptor strength and orbital angular momentum by the vacant 3d-orbitals of sulfur. Atom substitution increased the contribution of the delayed fluorescence component to the total EL efficiency (65.1&#37; -> 78.0&#37;). This resulted from enhanced reverse intersystem crossing, because of the reduced energy gap between S-1 and T-1.

    DOI: 10.1021/jp510751n

  • Phosphorescent Cu(I) complexes based on bis(pyrazol-1-yl-methyl)-pyridine derivatives for organic light-emitting diodes 査読

    Fengshou Wu, Jie Li, Hongbo Tong, Zaoying Li, Chihaya Adachi, Adam Langlois, Pierre D. Harvey, Li Liu, Wai-Yeung Wong, Wai-Kwok Wong, Xunjin Zhu

    JOURNAL OF MATERIALS CHEMISTRY C   3 ( 1 )   138 - 146   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Mononuclear Cu(I) complexes based on bis(pyrazol-1-yl-methyl)-pyridine derivatives and ancillary triphenylphosphine have been prepared and characterized by H-1 NMR, mass spectroscopy and single-crystal X-ray analysis. The thermogravimetric analysis shows that the complexes exhibit high thermal stability. The electronic absorption spectra display two features in the regions of 230-260 and 290-350 nm attributable to mixed ligand-to-ligand (LLCT) and metal-to-ligand-charge-transfer (MLCT) excited states, which is supported by the results of density functional theory (DFT) and time-dependent DFT (TDDFT) calculations on these Cu(I) complexes. These complexes are strongly emissive in the solid state at ambient temperature. Intense blue or green emission in the poly(methyl methacrylate) film is observed in the region of 475-518 nm for these complexes with the emission lifetimes in the microsecond time scale (12-20 mu s), indicating that the emission may be phosphorescence emission. Increasing the steric hindrance of the substituents on the pyrazole unit results in a blue-shift of the emission bands and enhanced emission quantum efficiency in PMMA films. The two most emissive complexes have been used for the fabrication of phosphorescent organic light-emitting diodes (POLEDs).

    DOI: 10.1039/c4tc01885k

  • Photometric flow injection determination of phosphate on a PDMS microchip using an optical detection system assembled with an organic light emitting diode and an organic photodiode 査読

    Rong Liu, Ryoichi Ishimatsu, Masayuki Yahiro, Chihaya Adachi, Koji Nakano, Toshihiko Imato

    TALANTA   132   96 - 105   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A compact photometric detector was constructed from an organic light emitting diode (OLED) based on a europium complex, europium(diben-zoylmethanato)(3)(bathophenanthroline) (Eu(DBM)(3)bath), as the light source and an organic photodiode (OPD) fabricated from a hetero-junction of two layers of copper phthalocyanine (CuPc)/fullerene (C-60) as the photo-detector on a microchip prepared from poly (dimethylsiloxan) (PDMS) and was applied to the determination of phosphate. The OLED and the OPD were fabricated by a vapor deposition method on an indium tin oxide (ITO) coated glass substrate with the following layered structure; Glass (0.7 mm)/ITO (110 nm)/4,4'-bis[N-(1-naphthyl)-N-phenyl amino]biphenyl (alpha-NPD) (30 nm)/4,4'-di(N-carbazolyl)biphenyl (CBP): Eu3+ (8 wt&#37;, 30 nm)/bathocuproine (BCP) (30 nm)/aluminum tris(8-hydroxyquinoline) (Alq(3)) (25 nm)/magnesium and silver (MgAg) (100 nm)/Ag (10 nm) and Glass (0.7 mm)/ITO (110 nm)/CuPc (35 nm)/C-60 (50 nm)/BCP (10 nm)/Ag (50 nm), respectively. The OLED based on the europium complex emitted a sharp light at the wavelength of 612 nm with a full width at half maximum (FWHM) of 8 nm. The performance of the photometric detector assembled was evaluated based on measurements of the absorbance of different concentrations of malachite green (MG) solutions for a batch system with 1 cm long path length. The molar absorptive coefficient of the MG solution, calculated from the photocurrent of the OPD, was in good agreement with the value reported in the literature. A microchip with two inlets and one outlet U-shaped channel was prepared by a conventional photolithograph method. The OLED and the OPD were configured so as to face each other through the PDMS microchip in parallel in order to align the light axis of the OLED and the OPD with the flow cell (optical path length of 5 mm), which was located at the end of outlet. For the determination of phosphate, an ion-association reaction between MG and a molybdenum-phosphate complex was utilized and a good linear relationship between the concentration and absorbance was observed in the concentration range 0-0.2 ppm, with a detection limit (S/N=3) of 0.02 ppm. The assembled photometric detector was also applied to the determination of phosphate by the flow injection of river water samples using the reagent solution containing MG and molybdenum ammonium in sulfuric acid. A good recovery (97-99&#37;) for the river water samples, which had been spiked with the standard 0.08 ppm, with an RSD of ca 5&#37; (n=5) was obtained using the constructed system. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.talanta.2014.08.057

  • Enhanced Electroluminescence from a Thermally Activated Delayed-Fluorescence Emitter by Suppressing Nonradiative Decay 査読

    Katsuyuki Shizu, Motoyuki Uejima, Hiroko Nomura, Tohru Sato, Kazuyoshi Tanaka, Hironori Kaji, Chihaya Adachi

    PHYSICAL REVIEW APPLIED   3 ( 1 )   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermally activated delayed-fluorescence (TADF) is a promising approach for realizing highly efficient organic light-emitting diodes (OLEDs). By controlling the spatial overlap between the frontier orbitals to suppress nonradiative decay, we develop a highly efficient TADF emitter, N-1-[4-(4,6-diphenyl-1,3, 5-triazin-2-yl)phenyl]-N-1-[4-(diphenylamino)-phenyl]-N-4, N-4-diphenylbenzene-1,4-diamine (DPA-TRZ). DPA-TRZ exhibits a photoluminescence quantum efficiency of 100&#37; when doped into a host material, suggesting that nonradiative decay from its excited states is completely suppressed. Transient photoluminescence measurements confirm that DPA-TRZ emits TADF in a doped film. An OLED containing DPA-TRZ as a green emitter shows a maximum external quantum efficiency of 13.8&#37;, which exceeds the theoretical limit for conventional fluorescent OLEDs. This high efficiency results from the effective generation of TADF and suppressed nonradiative decay in DPA-TRZ. Our molecular design strategy based on quantum chemistry provides a rational approach to control radiative and nonradiative decays for optimizing TADF materials.

    DOI: 10.1103/PhysRevApplied.3.014001

  • Strategy for Designing Electron Donors for Thermally Activated Delayed Fluorescence Emitters 査読

    Katsuyuki Shizu, Hiroyuki Tanaka, Motoyuki Uejima, Tohru Sato, Kazuyoshi Tanaka, Hironori Kaji, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   119 ( 3 )   1291 - 1297   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermally activated delayed fluorescence (TADF) emitters are promising dopants for organic light-emitting diodes, including those containing highly twisted donor-acceptor-type structures. However, highly twisted structures limit the variety of chemical structures applicable as TADF emitters. We present a strategy for designing electron donors that can eliminate this requirement and increase the structural diversity of TADF emitters. Using this strategy, we developed an electron donor containing carbazolyl and diphenylamino groups by carefully controlling its electron-donating ability. By combining this donor with a quinoxaline-based acceptor, we obtained the efficient green TADF emitter, N-3,N-3,N-6,N-6-tetraphenyl-9-(4-(quinoxalin-6-yl)phenyl)-9H-carbazole-3,6-diamine (DACQ), without a highly twisted structure. DACQ exhibits high photoluminescence and electroluminescence efficiencies, comparable to those of a highly twisted TADF emitter containing the same electron-accepting unit. Quantum chemical calculations showed that the diphenylamino groups within the carbazolyl moiety effectively withdraw the HOMO distribution. This reduces the singlet-triplet energy gap, thus inducing TADF. The photophysical properties of TADF compounds depend on the twisting angle between the electron-donating and accepting units. Eliminating the highly twisted structure increases the diversity of potential TADF emitters and allows their photophysical properties to be controlled by changing the twisting angle.

    DOI: 10.1021/jp511061t

  • X-shaped benzoylbenzophenone derivatives with crossed donors and acceptors for highly efficient thermally activated delayed fluorescence 査読 国際誌

    Sae Youn Lee; Takuma Yasuda; In Seob Park; Chihaya Adachi

    Dalton Transactions   44   8356 - 8359   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C4DT03608E

  • Zinc complexes exhibiting highly efficient thermally activated delayed fluorescence and their application to organic light-emitting diodes 査読 国際誌

    Yumi Sakai; Yuta Sagara; Hiroko Nomura; Nozomi Nakamura; Yoshitake Suzuki; Hiroshi Miyazaki; Chihaya Adachi

    Chem. Comm.   51   3181 - 3184   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C4CC09403D

  • Controlled emission color and singlet-triplet energy gap of dihydrophenazine-based thermally activated delayed fluorescence emitters 査読 国際誌

    Jiyoung Lee; Katsuyuki Shizu; Hiroyuki Tanaka; Hajime Nakanotani; Takuma Yasuda; Hironori Kaji; Chihaya Adachi

    J. Mater. Chem. C   3   2175 - 2181   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C4TC02530J

  • Photometric flow injection determination of phosphate on a PDMS microchip using an optical detection system assembled with an organic light emitting diode and an organic photodiode 査読 国際誌

    Rong Liu; Ryoichi Ishimatsu; Masayuki Yahiro; Chihaya Adachi; Koji Nakano; Toshihiko Imato

    Talanta   134   37 - 47   2015年1月

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    記述言語:英語  

    DOI: 10.1016/j.talanta.2014.10.055

  • Enhanced Electroluminescence from a Thermally Activated Delayed-Fluorescence Emitter by Suppressing Nonradiative Decay 査読

    Katsuyuki Shizu, Motoyuki Uejima, Hiroko Nomura, Tohru Sato, Kazuyoshi Tanaka, Hironori Kaji, Chihaya Adachi

    PHYSICAL REVIEW APPLIED   3 ( 1 )   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermally activated delayed-fluorescence (TADF) is a promising approach for realizing highly efficient organic light-emitting diodes (OLEDs). By controlling the spatial overlap between the frontier orbitals to suppress nonradiative decay, we develop a highly efficient TADF emitter, N-1-[4-(4,6-diphenyl-1,3, 5-triazin-2-yl)phenyl]-N-1-[4-(diphenylamino)-phenyl]-N-4, N-4-diphenylbenzene-1,4-diamine (DPA-TRZ). DPA-TRZ exhibits a photoluminescence quantum efficiency of 100&#37; when doped into a host material, suggesting that nonradiative decay from its excited states is completely suppressed. Transient photoluminescence measurements confirm that DPA-TRZ emits TADF in a doped film. An OLED containing DPA-TRZ as a green emitter shows a maximum external quantum efficiency of 13.8&#37;, which exceeds the theoretical limit for conventional fluorescent OLEDs. This high efficiency results from the effective generation of TADF and suppressed nonradiative decay in DPA-TRZ. Our molecular design strategy based on quantum chemistry provides a rational approach to control radiative and nonradiative decays for optimizing TADF materials.

    DOI: 10.1103/PhysRevApplied.3.014001

  • Anthraquinone-Based Intramolecular Charge-Transfer Compounds: Computational Molecular Design, Thermally Activated Delayed Fluorescence, and Highly Efficient Red Electroluminescence 査読

    Qisheng Zhang, Hirokazu Kuwabara, William J. Potscavage, Shuping Huang, Yasuhiro Hatae, Takumi Shibata, Chihaya Adachi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   136 ( 52 )   18070 - 18081   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Red fluorescent molecules suffer from large, non-radiative internal conversion rates (k(IC)) governed by the energy gap law. To design efficient red thermally activated delayed fluorescence (TADF) emitters for organic light-emitting diodes (OLEDs), a large fluorescence rate (k(F)) as well as a small energy difference between the lowest singlet and triplet excited states (Delta E-ST) is necessary. Herein, we demonstrated that increasing the distance between donor (D) and acceptor (A) in intramolecular-charge-transfer molecules is a promising strategy for simultaneously achieving small Delta E-ST and large k(F). Four D-Ph-A-Ph-D-type molecules with an anthraquinone acceptor, phenyl (Ph) bridge, and various donors were designed, synthesized, and compared with corresponding D-A-D-type molecules. Yellow to red TADF was observed from all of them. The k(F) and Delta E-ST values determined from the measurements of quantum yield and lifetime of the fluorescence and TADF components are in good agreement with those predicted by corrected time-dependent density functional theory and are approximatively proportional to the square of the cosine of the theoretical twisting angles between each subunit. However, the introduction of a Ph-bridge was found to enhance k(F) without increasing Delta E-ST. Molecular simulation revealed a twisting and stretching motion of the NC bond in the D-A-type molecules, which is thought to lower Delta E-ST and k(F) but raise k(IC), that was experimentally confirmed in both solution and doped film. OLEDs containing D-Ph-A-Ph-D-type molecules with diphenylamine and bis(4-biphenyl)amine donors demonstrated maximum external quantum efficiencies of 12.5&#37; and 9.0&#37; with emission peaks at 624 and 637 nm, respectively.

    DOI: 10.1021/ja510144h

  • Solution-Processable Host Material of 1,3-Bis{3-[3-(9-carbazolyl)phenyl]-9-carbazolyl}benzene and its Application in Organic Light-Emitting Diodes Employing Thermally Activated Delayed Fluorescence 査読 国際誌

    Yoshitake Suzuki; Qisheng Zhang; Chihaya Adachi

    J. Mater. Chem. C   3   1700 - 1706   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C4TC02211D

  • Enhancement of the electrical characteristics of metal-free phthalocyanine films using cold isostatic pressing 査読

    Toshinori Matsushima, Yu Esaki, Chihaya Adachi

    APPLIED PHYSICS LETTERS   105 ( 24 )   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Spatial gaps between grains and other grains, substrates, or electrodes in organic electronic devices are one of the causes of the reduction in the electrical characteristics. In this study, we demonstrate that cold isostatic pressing (CIP) is an effective method to crush the gaps and enhance the electrical characteristics. CIP of metal-free phthalocyanine (H2PC) films induced a decrease in the film thickness by 34&#37;-40&#37; because of the gap crush. The connection of smaller grains into a larger grain and planarization of the film surface were also observed in the CIP film. The crystal axes of the H2PC crystallites were rearranged from the a-axis to the c-axis of the alpha-phase crystal structure in a direction perpendicular to the substrate by CIP, indicating favorable hole injection and transport in this direction because of a better overlap of pi orbitals. Thermally stimulated current measurements showed that deep hole traps disappeared and the total hole-trap density decreased after CIP. These CIP-induced changes of the film thicknesses, crystal axes and the hole traps lead to a marked increase in the hole mobility of the H2PC films from 2.0 x 10(-7) to 4.0 x 10(-4) cm(2)/V s by 2000 times in the perpendicular direction. We believe that these findings are important for unveiling the underlying carrier injection and transport mechanisms of organic films and for enhancing the performance of future organic electronic devices. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4904463

  • Origin of external quantum efficiency degradation in organic light-emitting diodes with a DC magnetron sputtered cathode 査読

    Hiroshi Fujimoto, Takuya Miyayama, Noriaki Sanada, Chihaya Adachi

    Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics   32 ( 6 )   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    This paper characterizes changes in organic light-emitting diodes to better understand the origin of the decrease in external quantum efficiency (η&lt
    inf&gt
    ext&lt
    /inf&gt
    ) when switching the cathode deposition method from evaporation to DC magnetron sputtering. An increase of driving voltage and a hole-barrier-dependent decrease of η&lt
    inf&gt
    ext&lt
    /inf&gt
    when the Al cathode is sputtered suggest that disruption of carrier balance and penetration of holes from the emissive layer (EML) into the electron transport layer (ETL) are significant sources of the device degradation. When the ETL was doped with Li, degradation was suppressed and the increase in driving voltage was drastically reduced although η&lt
    inf&gt
    ext&lt
    /inf&gt
    still decreased by 5&#37;-7&#37;. Analysis of the films by time-of-flight secondary ion mass spectrometry indicates that Li diffuses into the EML when Al is sputtered, and Li is shown to act as an exciton quencher that can decrease η&lt
    inf&gt
    ext&lt
    /inf&gt
    . Doping of the ETL is also used to significantly suppress the performance reduction with sputtered cathodes even when using a phosphorescent emitter having high η&lt
    inf&gt
    ext&lt
    /inf&gt
    .

    DOI: 10.1116/1.4897920

  • Exfoliation of Graphite into Graphene in Polar Solvents Mediated by Amphiphilic Hexa-peri-hexabenzocoronene 査読

    Ryota Kabe, Xinliang Feng, Chihaya Adachi, Klaus Muellen

    CHEMISTRY-AN ASIAN JOURNAL   9 ( 11 )   3125 - 3129   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A water-soluble surfactant consisting of hexa-peri-hexabenzocoronene (HBC) as hydrophobic aromatic core and hydrophilic carboxy substituents was synthesized. It exhibited a self-assembled nanofiber structure in the solid state. Profiting from the pi interactions between the large aromatic core of HBC and graphene, the surfactant mediated the exfoliation of graphite into graphene in polar solvents, which was further stabilized by the bulky hydrophilic carboxylic groups. A graphene dispersion with a concentration as high as 1.1 mgL(-1) containing 2-6 multilayer nanosheets was obtained. The lateral size of the graphene sheets was in the range of 100-500 nm based on atomic force microscope (AFM) and transmission electron microscope (TEM) measurements.

    DOI: 10.1002/asia.201402535

  • Improved organic thin-film transistor characteristics using an elevated-electrode structure 査読

    Seung Kyum Kim, Chang-Hoon Shim, Tomohiko Edura, Chihaya Adachi, Reiji Hattori

    JAPANESE JOURNAL OF APPLIED PHYSICS   53 ( 11 )   111601   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We propose a new structure for organic thin-film transistors, denoted as "elevated-electrode structure" in which the source and drain electrodes are formed on the elevated insulation layer. Indeed, the experimental data shows that this new structure has more than twice the drain current and mobility of a conventional bottom-structured TFT, this being found to be directly related to the height of the elevated electrode. Moreover, the reproducibility of this data confirms a greater stability than that of either top-contact or bottom-contact devices. (C) 2014 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.53.111601

  • Origin of external quantum efficiency degradation in organic light-emitting diodes with a DC magnetron sputtered cathode 査読

    Hiroshi Fujimoto, Takuya Miyayama, Noriaki Sanada, Chihaya Adachi

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B   32 ( 6 )   60603   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    This paper characterizes changes in organic light-emitting diodes to better understand the origin of the decrease in external quantum efficiency (eta(ext)) when switching the cathode deposition method from evaporation to DC magnetron sputtering. An increase of driving voltage and a hole-barrier-dependent decrease of eta(ext) when the Al cathode is sputtered suggest that disruption of carrier balance and penetration of holes from the emissive layer (EML) into the electron transport layer (ETL) are significant sources of the device degradation. When the ETL was doped with Li, degradation was suppressed and the increase in driving voltage was drastically reduced although eta(ext) still decreased by 5&#37;-7&#37;. Analysis of the films by time-of-flight secondary ion mass spectrometry indicates that Li diffuses into the EML when Al is sputtered, and Li is shown to act as an exciton quencher that can decrease eta(ext). Doping of the ETL is also used to significantly suppress the performance reduction with sputtered cathodes even when using a phosphorescent emitter having high eta(ext). (C) 2014 American Vacuum Society.

    DOI: 10.1116/1.4897920

  • Different orientation of the transition dipole moments of two similar Pt(II) complexes and their potential for high efficiency organic light-emitting diodes 査読

    Christian Mayr, Masatsugu Taneda, Chihaya Adachi, Wolfgang Bruetting

    ORGANIC ELECTRONICS   15 ( 11 )   3031 - 3037   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The efficiency of organic light-emitting diodes (OLEDs) is especially limited by their low light outcoupling efficiency. An approach for its enhancement is the use of horizontally oriented emitter molecules with respect to the substrate. In this study we quantitatively determine the orientation of the optical transition dipole moments in doped films of two similar phosphorescent Pt(II) complexes having a linear molecular structure. These emitters are employed in OLED devices and their efficiency is analyzed by optical simulations. For an OLED with slightly more horizontally oriented emitter molecules an external quantum efficiency (eta(EQE)) of 15.8&#37; at low current-density is realized, indicating a relative improvement of outcoupling efficiency of 5.3&#37; compared to the isotropic case. However, a very similar complex adopting isotropic molecular orientation yields eta(EQE) of only 11.5&#37; implying an imperfect charge carrier balance in the OLED device and a shift of the recombination zone. Furthermore, we highlight the enormous potential of horizontal molecular orientation of emitting molecules in OLEDs. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2014.07.042

  • Analysis of electron traps formed in organic films with a sputtered cathode 査読

    Hiroshi Fujimoto, William J. Potscavage, Tomohiko Edura, Chihaya Adachi

    ORGANIC ELECTRONICS   15 ( 11 )   2783 - 2791   2014年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To understand why performance degradation is reduced for sputtered cathodes on organic devices when the electron transport layer (ETL) is doped with Li, we analyze electron-only devices using the thermally stimulated current (TSC) technique and modeling of temperature-dependent current-voltage characteristics with a trapped-charge-limited current (TCLC) model. The combined results suggest that the trap density measured by TSC might also include a portion of the density of the hopping sites in the lowest unoccupied molecular orbital levels, which contributes to charge transport. Compared to undoped devices, doped devices maintain a high density of hopping sites even when the Al is sputtered. We propose that the reduced effect of sputtering on electron injection and transport properties is because radical anions of Alq(3) might still be formed by the strong reducer Li even if the organic material is partially damaged. An additional TSC peak and increased driving voltage for doped tris(8-hydroxyquinoline)aluminum (Alq(3)) as an ETL with a sputtered cathode suggests the formation of new traps possibly because of damage even though the transport is better compared to the undoped device. Such traps are not found in doped bathophenanthroline (Bphen) as an ETL, which shows no change in driving voltage. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2014.08.021

  • Large reverse saturable absorption under weak continuous incoherent light 査読

    Shuzo Hirata, Kenro Totani, Takashi Yamashita, Chihaya Adachi, Martin Vacha

    NATURE MATERIALS   13 ( 10 )   938 - 946   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In materials showing reverse saturable absorption (RSA), the optical absorbance increases as the power of the light incident on them increases. To date, RSA has only been observed when very intense light sources, such as short-pulse lasers, are used. Here, we show that hydroxyl steroidal matrices embedding properly designed aromatic molecules as acceptors and transition-metal complexes as donors exhibit high RSA on exposure to weak incoherent light at room temperature and in air. Accumulation by photosensitization of long-lived room-temperature triplet excitons in acceptors with a large triplettriplet absorption coefficient allows a nonlinear increase in absorbance also under low-power irradiation conditions. As a consequence, continuous exposure to weak light significantly decreases the transmittance of thin films fabricated with these compounds. These optical limiting properties may be used to protect eyes and light sensors from exposure to intense radiation generated by incoherent sources and for other light-absorption applications that have not been realized with conventional RSA materials.

    DOI: 10.1038/NMAT4081

  • Influence of host matrix on thermally-activated delayed fluorescence: Effects on emission lifetime, photoluminescence quantum yield, and device performance 査読

    Gabor Mehes, Kenichi Goushi, William J. Potscavage, Chihaya Adachi

    ORGANIC ELECTRONICS   15 ( 9 )   2027 - 2037   2014年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The influence of the host molecules on the photoluminescent (PL) and electroluminescent (EL) properties of organic light-emitting diode (OLED) emitters showing efficient thermally-activated delayed fluorescence (TADF) has yet to be investigated in detail. Here we demonstrate that the choice of host can cause large variations in the PL quantum yield (Phi(PL) similar to 15-70&#37;) and delayed PL transient decay (tau(del) similar to 2-70 ms) of a spiro-acridine-based TADF guest. We show that the effect of exciplex formation on Phi(PL) must be considered even at low concentrations of the TADF guest. Using the same TADF guest but changing the host layer, we are able to greatly vary the PL transient decay time from similar to 4 to similar to 70 ms while maintaining a high Phi(PL) similar to 70&#37;, which can lead to new applications. Detailed spectral characterization during PL decay reveals a gradually increasing singlet-triplet energy gap (Delta E-ST) as the origin of these observations. The time-varying Delta E-ST is explained based on dipole interactions between the host and guest molecules. Finally, PL and electrical considerations for host selection are discussed based on the performance of OLED devices. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2014.05.027

  • Introduction of F-4-TCNQ/MoO3 layers for thermoelectric devices based on pentacene 査読

    Wu Shuang-Hong, Ryosuke Nakamichi, Masatsugu Taneda, Zhang Qi-Sheng, Chihaya Adachi

    CHINESE PHYSICS B   23 ( 9 )   98502   2014年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We introduced a dual electron accepting layer composed of tetrafluoro-tetracyanoquinodimethane (F-4-TCNQ) and MoO3 for thermoelectric devices based on a pentacene layer. We found that the power factor is enhanced by placing an F-4-TCNQ layer directly in contact with the pentacene layer and it is also enhanced by placing a MoO3 layer between the F-4-TCNQ layer and the Au electrode. By examining the contact resistance using a field effect transistor and a hole-only diode, we confirmed that the hole injection is improved due to the reduction of contact resistance at the interface between the MoO3 layer and the Au electrode.

    DOI: 10.1088/1674-1056/23/9/098502

  • Fabrication and characterization of large-area flexible microfluidic organic light-emitting diode with liquid organic semiconductor 査読

    Miho Tsuwaki, Takashi Kasahara, Tomohiko Edura, Shigeyuki Matsunami, Juro Oshima, Shuichi Shoji, Chihaya Adachi, Jun Mizuno

    SENSORS AND ACTUATORS A-PHYSICAL   216   231 - 236   2014年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We propose simple and high-throughput fabrication of large-area flexible microfluidic organic light-emitting diodes (microfluidic OLEDs). Flexible electro-SU-8-microchannels with a liquid emission layer were fabricated by the following four steps: (a) screen printing for transparent electrodes, (b) novel belttransfer exposure for SU-8, (c) heterogeneous low-temperature bonding using self-assembled monolayers (SAMs), and (d) injecting a liquid emitter into the microchannels.1-Pyrenebutyric acid 2-ethylhexyl ester (PLQ), which is on of liquid organic semiconductors, was used as a liquid emitter. The liquid emitter successfully filled the flexible microchannels, and electroluminescence was obtained both in flat and curved states. The proposed microfluidic OLED is applicable for future flexible posters or displays, and can be adopted around curved surfaces. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.sna.2014.05.032

  • Efficiency Enhancement of Organic Light-Emitting Diodes Incorporating a Highly Oriented Thermally Activated Delayed Fluorescence Emitter 査読

    Christian Mayr, Sae Youn Lee, Tobias D. Schmidt, Takuma Yasuda, Chihaya Adachi, Wolfgang Bruetting

    ADVANCED FUNCTIONAL MATERIALS   24 ( 33 )   5232 - 5239   2014年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    An organic light-emitting diode (OLED) with the blue emitter CC2TA showing thermally activated delayed fluorescence (TADF) is presented exhibiting an external quantum efficiency (eta(EQE).) of 11&#37; +/- 1&#37;, which clearly exceeds the classical limit for fluorescent OLEDs. The analysis of the emission layer by angular dependent photoluminescence (PL) measurements shows a very high degree of 92&#37; horizontally oriented transition dipole moments. Excited states lifetime measurements of the prompt fluorescent component under PL excitation yield a radiative quantum efficiency of 55&#37; of the emitting species. Thus, the radiative exciton fraction has to be significantly higher than 25&#37; due to TADF. Performing a simulation based efficiency analysis for the OLED under investigation allows for a quantification of individual contributions to the efficiency increase originating from horizontal emitter orientation and TADF. Remarkably, the strong horizontal emitter orientation leads to a light-outcoupling efficiency of more than 30&#37;.

    DOI: 10.1002/adfm.201400495

  • Analysis of alternating current driven electroluminescence in organic light emitting diodes: A comparative study 査読

    Le Zhang, Hajime Nakanotani, Kou Yoshida, Chihaya Adachi

    ORGANIC ELECTRONICS   15 ( 8 )   1815 - 1821   2014年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The alternating current (AC) responses of double-injection and double-insulated organic light-emitting diodes (OLEDs) were investigated and compared. To reveal the electroluminescent (EL) processes in these devices, the AC voltage and frequency dependence of the EL intensity and capacitive current were studied in the time domain with a focus on phase difference analysis. It was found that the voltage-dependent transit time and frequencydependent carrier distribution were important for the AC-driven performance of the double-injection OLEDs. In contrast, although the double-insulated OLEDs shared some similarities with the double-injection OLEDs, they had some unique characteristics, which were the absence of resistive current and phase shift of EL profiles. It was revealed that the EL in the double-insulated OLEDs was driven by the displacement current generated by the ionization of the doped layers, which, however, formed space charge regions and undermined the EL emission. The space charge redistributed the electric field across the devices after the initiation of EL, making the EL maintain for a limited time interval. This effect was significant under low frequency and high AC voltage. Comparing the phase difference between both devices, it was indicated that the space charge effect was responsible for the observed EL phase shift and the asymmetric EL profiles at low frequency and high AC voltage in the double-insulated OLEDs. The proposed model was also of help to understand the EL saturation phenomena with AC frequency and voltage in those devices. (C) 2014 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.orgel.2014.05.009

  • Multi-color microfluidic electrochemiluminescence cells 査読

    Takashi Kasahara, Shigeyuki Matsunami, Tomohiko Edura, Ryoichi Ishimatsu, Juro Oshima, Miho Tsuwaki, Toshihiko Imato, Shuichi Shoji, Chihaya Adachi, Jun Mizuno

    SENSORS AND ACTUATORS A-PHYSICAL   214   225 - 229   2014年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrated multi-color microfluidic electrochemiluminescence (ECL) cells. 5,6,11,12-Tetraphenylnaphthacene (rubrene), 9,10-diphenylanthracene (DPA), tetraphenyldibenzoperiflanthene (DBP)-doped rubrene, and 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) dissolved in a mixed organic solvent of 1,2-dichlorobenzene and acetonitrile in the ratio of 2:1 (v/v) were used as yellow, blue, red, and green ECL solutions, respectively. Light emissions were confirmed using simple-structured ECL cells consisting of two indium tin oxide (ITO) coated glass substrates with an SU-8 spacer of thickness varying from 0.9 to 6 mu m. The SU-8-based microfluidic ECL cells were fabricated using photolithography and heterogeneous bonding techniques through the use of epoxy-and amine-terminated self-assembled monolayers. The emitting layers were formed on-demand by injecting the chosen ECL solutions into the microchannels sandwiched between ITO anode and cathode pairs. Multi-color ECL was successfully obtained at the light-emitting pixels. The microfluidic ECL cells with DBP-doped rubrene solution showed a maximum luminance of 11.6 cd/m(2) and the current efficiency of ca. 0.32 cd/A at 8V. We expect that the proposed microfluidic device will be a highly promising technology for liquid-based light-emitting applications. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.sna.2014.04.039

  • Thermally activated delayed fluorescence from (3)n pi* to (1)n pi* up-conversion and its application to organic light-emitting diodes 査読

    Jie Li, Qisheng Zhang, Hiroko Nomura, Hiroshi Miyazaki, Chihaya Adachi

    APPLIED PHYSICS LETTERS   105 ( 1 )   2014年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Intense n pi* fluorescence from a nitrogen-rich heterocyclic compound, 2,5,8-tris(4-fluoro-3-methylphenyl)-1,3,4,6,7,9,9b-heptaazaphenalene (HAP-3MF), is demonstrated. The overlap-forbidden nature of the np* transition and the higher energy of the (3)pi pi* state than the 3 n pi* one lead to a small energy difference between the lowest singlet (S-1) and triplet (T-1) excited states of HAP-3MF. Green-emitting HAP-3MF has a moderate photoluminescence quantum yield of 0.26 in both toluene and doped film. However, an organic light-emitting diode containing HAP-3MF achieved a high external quantum efficiency of 6.0&#37;, indicating that HAP-3MF harvests singlet excitons through a thermally activated T-1 -> S-1 pathway in the electroluminescent process. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4887346

  • Electrogenerated Chemiluminescence of Donor-Acceptor Molecules with Thermally Activated Delayed Fluorescence 査読

    Ryoichi Ishimatsu, Shigeyuki Matsunami, Takashi Kasahara, Jun Mizuno, Tomohiko Edura, Chihaya Adachi, Koji Nakano, Toshihiko Imato

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   53 ( 27 )   6993 - 6996   2014年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The electrochemistry and electrogenerated chemiluminescence (ECL) of four kinds of electron donor-acceptor molecules exhibiting thermally activated delayed fluorescence (TADF) is presented. TADF molecules can harvest light energy from the lowest triplet state by spin up-conversion to the lowest singlet state because of small energy gap between these states. Intense green to red ECL is emitted from the TADF molecules by applying a square-wave voltage. Remarkably, it is shown that the efficiency of ECL from one of the TADF molecule could reach about 50&#37;, which is comparable to its photoluminescence quantum yield.

    DOI: 10.1002/anie.201402615

  • Thermally Activated Delayed Fluorescence from a Spiro-diazafluorene Derivative 査読

    Hiroshi Ohkuma, Tetsuya Nakagawa, Katsuyuki Shizu, Takuma Yasuda, Chihaya Adachi

    CHEMISTRY LETTERS   43 ( 7 )   1017 - 1019   2014年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A Spiro compound DPAA-AF combining an electron-accepting diazafluorene unit and an electron-donating bis(diphenylamino)acridane unit has been synthesized and used as an emitter in organic light-emitting diodes. DPAA-AF exhibits efficient thermally activated delayed fluorescence, and a device based on this compound emits blue-greenish electroluminescence with a maximum external quantum efficiency of 9.6&#37;.

    DOI: 10.1246/cl.140360

  • Dual Intramolecular Charge-Transfer Fluorescence Derived from a Phenothiazine-Triphenyltriazine Derivative 査読

    Hiroyuki Tanaka, Katsuyuki Shizu, Hajime Nakanotani, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   118 ( 29 )   15985 - 15994   2014年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A material containing a phenothiazine (PTZ) electron donor unit and 2,4,6-triphenyl-1,3,5-triazine (TRZ) electron acceptor unit, PTZ-TRZ, which exhibits thermally activated delayed fluorescence (TADF) was developed. Density functional theory calculations revealed the existence of two ground-state conformers with different energy gaps between the lowest singlet excited state and lowest triplet excited state (1.14 and 0.18 eV), which resulted from the distortion of PTZ, as confirmed by X-ray structure analysis. PTZ-TRZ in toluene solution showed two broad, structureless emissions, confirming the existence of two different excited states. From detailed analyses of the absorption and photoluminescence spectra, we determined that both emissions were intramolecular charge-transfer (ICT) fluorescence. Therefore, the excited-state conformers of PTZ-TRZ resulted in dual ICT fluorescence. Because previously reported dual fluorescence from single molecules involves locally excited and ICT fluorescence, the dual ICT fluorescence from PTZ-TRZ is novel. Temperature-dependence of transient PL spectra of a 2 wt &#37; PTZ-TRZ-doped film in 3,3'-bis(N-carbazolyl)-1,1'-biphenyl measured by a streak camera revealed that the former and latter emissions were independent of and dependent on the film temperature, respectively. This confirms that the dual fluorescence involves TADF characteristics. An organic light-emitting diode containing PTZ-TRZ exhibited a maximum external quantum efficiency of 10.8 +/- 0.596 with dual ICT fluorescence.

    DOI: 10.1021/jp501017f

  • Fabrication of high-efficiency multilayered organic light-emitting diodes by a film transfer method 査読

    Kenji Kawano, Kaori Nagayoshi, Takeyuki Yamaki, Chihaya Adachi

    ORGANIC ELECTRONICS   15 ( 7 )   1695 - 1701   2014年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this paper, we report the fabrication of small-molecule-based thin-film layers with a thickness of several tens of nanometers on a release layer by bar coating and subsequent stacking onto other organic layers by the developed film transfer method using driving belts and rollers as a prototype roll-to-roll technique. We use novel thermally activated delayed fluorescence (TADF) materials in this process, achieving multilayered organic light-emitting diodes (OLEDs) with high external quantum efficiency (EQE), which is comparable to those of OLEDs prepared by conventional vacuum deposition. The developed film transfer method shows great potential to realize OLEDs with high efficiency at low cost. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2014.04.035

  • Luminous Butterflies: Efficient Exciton Harvesting by Benzophenone Derivatives for Full-Color Delayed Fluorescence OLEDs 査読

    Sae Youn Lee, Takuma Yasuda, Yu Seok Yang, Qisheng Zhang, Chihaya Adachi

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   53 ( 25 )   6402 - 6406   2014年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Butterfly-shaped luminescent benzophenone derivatives with small energy gaps between their singlet and triplet excited states are used to achieve efficient full-color delayed fluorescence. Organic light-emitting diodes (OLEDs) with these benzophenone derivatives doped in the emissive layer can generate electroluminescence ranging from blue to orange-red and white, with maximum external quantum efficiencies of up to 14.3&#37;. Triplet excitons are efficiently harvested through delayed fluorescence channels.

    DOI: 10.1002/anie.201402992

  • Fabrication of a Flexible Bismuth Telluride Power Generation Module Using Microporous Polyimide Films as Substrates 査読

    Kunihisa Kato, Yoshika Hatasako, Makoto Kashiwagi, Harutoshi Hagino, Chihaya Adachi, Koji Miyazaki

    JOURNAL OF ELECTRONIC MATERIALS   43 ( 6 )   1733 - 1739   2014年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this study, we investigated the effect of the structure of microporous p-type (Bi0.4Te3Sb1.6) and n-type (Bi2.0Te2.7Se0.3) BiTe-based thin films on their thermoelectric performance. High-aspect-ratio porous thin films with pore depth greater than 1 mu m and pore diameter ranging from 300 nm to 500 nm were prepared by oxygen plasma etching of polyimide (PI) layers capped with a heat-resistant block copolymer, which acted as the template. The cross-plane thermal conductivities of the porous p- and n-type thin films were 0.4 W m(-1) K-1 and 0.42 W m(-1) K-1, respectively, and the dimensionless figures of merit, ZT, of the p- and n-type BiTe films were estimated as 1.0 and 1.0, respectively, at room temperature. A prototype thermoelectric module consisting of 20 pairs of p- and n-type strips over an area of 3 cm x 5 cm was fabricated on the porous PI substrate. This module produced an output power of 0.1 mW and an output voltage of 0.6 V for a temperature difference of 130A degrees C. The output power of the submicrostructured module was 1.5 times greater than that of a module based on smooth BiTe-based thin films. Thus, the thermoelectric performance of the thin films was improved owing to their submicroscale structure.

    DOI: 10.1007/s11664-013-2852-0

  • Third-generation organic electroluminescence materials 査読

    Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS   53 ( 6 )   2014年6月

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    記述言語:英語  

    Currently, organic light-emitting diodes (OLEDs) have reached the stage of commercialization, and there are intense efforts to use them in various applications from small-and medium-sized mobile devices to illumination equipment and large TV screens. In particular, phosphorescent materials have become core OLED materials as alternatives to the conventionally used fluorescent materials because devices made with phosphorescent materials exhibit excellent light-emitting performance. However, phosphorescent materials have several problems, such as their structure being limited to organic metal compounds containing rare metals, for example, Ir, Pt, and Os, and difficulty in realizing stable blue light emission, so the development of new materials is necessary. In this article, I will review next-generation OLEDs using a new light-emitting mechanism called thermally activated delayed fluorescence (TADF). Highly efficient TADF, which was difficult to realize with conventional technologies, has been achieved by optimizing molecular structures. This has led to the realization of ultimate next-generation OLEDs that are made of common organic compounds and can convert electricity to light at an internal quantum efficiency of nearly 100&#37;. (C) 2014 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.53.060101

  • High-efficiency white organic light-emitting diodes using thermally activated delayed fluorescence 査読

    Jun-ichi Nishide, Hajime Nakanotani, Yasuhide Hiraga, Chihaya Adachi

    APPLIED PHYSICS LETTERS   104 ( 23 )   2014年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    White organic light-emitting diodes (WOLEDs) have attracted much attention recently, aimed for next-generation lighting sources because of their high potential to realize high electroluminescence efficiency, flexibility, and low-cost manufacture. Here, we demonstrate high-efficiency WOLED using red, green, and blue thermally activated delayed fluorescence materials as emissive dopants to generate white electroluminescence. The WOLED has a maximum external quantum efficiency of over 17&#37; with Commission Internationale de l'Eclairage coordinates of (0.30, 0.38). (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4882456

  • Selectively Controlled Orientational Order in Linear-Shaped Thermally Activated Delayed Fluorescent Dopants 査読

    Takeshi Komino, Hiroyuki Tanaka, Chihaya Adachi

    CHEMISTRY OF MATERIALS   26 ( 12 )   3665 - 3671   2014年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The orientational order of a linear-shaped thermally activated delayed fluorescent dopant 10-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-10H-phenoxazine (PXZ-TRZ) was selectively controlled in a randomly oriented host matrix composed of 3,3-di(9H-carbazol-9-yl)biphenyl (mCBP) by varying the temperature during deposition of the thin films. Although the molecular orientation of mCBP was random at deposition temperatures ranging from 200 to 300 K (orientational disorder), PXZ-TRZ molecules oriented horizontal to the substrate in this temperature range (high orientational order). This indicates that the orientational order was dominated by the kinetic behavior of PXZ-TRZ at the film surface rather than by randomization caused by aggregation of PXZ-TRZ and mCBP molecules. Using an orientation-controlled 6 wt &#37; PXZ-TRZ:mCBP film as an emitting layer, we fabricated organic light-emitting diodes (OLEDs). The horizontal orientation of the dopants enhanced the external electroluminescence quantum efficiency of the OLED by 24&#37; compared with that of the corresponding OLED with slightly vertical orientation. An optical simulation found that the enhancement originates mainly from the improvement of the light out-coupling efficiency.

    DOI: 10.1021/cm500802p

  • Donor-acceptor-structured 1,4-diazatriphenylene derivatives exhibiting thermally activated delayed fluorescence: design and synthesis, photophysical properties and OLED characteristics 査読

    Takehiro Takahashi, Katsuyuki Shizu, Takuma Yasuda, Kazunori Togashi, Chihaya Adachi

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   15 ( 3 )   34202   2014年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A new series of luminescent 1,4-diazatriphenylene (ATP) derivatives with various peripheral donor units, including phenoxazine, 9,9-dimethylacridane and 3-(diphenylamino)carbazole, is synthesized and characterized as thermally activated delayed fluorescence (TADF) emitters. The influence of the donor substituents on the electronic and photophysical properties of the materials is investigated by theoretical calculations and experimental spectroscopic measurements. These ATP-based molecules with donor-acceptor-donor (D-A-D) structures can reduce the singlet-triplet energy gap (0.04-0.26 eV) upon chemical modification of the ATP core, and thus exhibit obvious TADF characteristics in solution and doped thin films. As a demonstration of the potential of these materials, organic light-emitting diodes containing the D-A-D-structured ATP derivatives as emitters are fabricated and tested. External electroluminescence quantum efficiencies above 12&#37; and 8&#37; for green- and sky-blue-emitting devices, respectively, are achieved.

    DOI: 10.1088/1468-6996/15/3/034202

  • Accurate measurement of dopant concentration in organic light-emitting diodes by combining high-performance liquid chromatography and TOF-SIMS 査読

    Hiroshi Fujimoto, Tomohiko Edura, Takuya Miyayama, Noriaki Sanada, Chihaya Adachi

    Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics   32 ( 3 )   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors report the use of high-performance liquid chromatography (HPLC) and time-of-flight secondary ion mass spectrometry (TOF-SIMS) utilizing a gas cluster ion beam to accurately measure the dopant concentration and its depth profile in organic thin films used for organic light-emitting diodes. The total dopant concentrations estimated by HPLC for films of 4,4'-bis(carbazol-9-yl)biphenyl (CBP) doped with tris(2-phenylpyridinato)iridium(III) (Ir(ppy)3) are consistent with those measured by quartz crystal microbalances (QCMs) during the deposition. Concentrations measured for Ir(ppy)3:CBP films by HPLC and TOF-SIMS show a nearly linear relationship in the range of 1-8 wt. &#37;. At concentrations higher than 8 wt. &#37;, TOF-SIMS values significantly deviate because of the matrix effect. The depth profile of the dopant concentration measured by TOF-SIMS was in good agreement with that measured by QCMs during film deposition for concentrations below 8 wt. &#37;. These methods are especially useful for comparing the dopant concentration of films deposited in different batches and equipment.

    DOI: 10.1116/1.4871756

  • Accurate measurement of dopant concentration in organic light-emitting diodes by combining high-performance liquid chromatography and TOF-SIMS 査読

    Hiroshi Fujimoto, Tomohiko Edura, Takuya Miyayama, Noriaki Sanada, Chihaya Adachi

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B   32 ( 3 )   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors report the use of high-performance liquid chromatography (HPLC) and time-of-flight secondary ion mass spectrometry (TOF-SIMS) utilizing a gas cluster ion beam to accurately measure the dopant concentration and its depth profile in organic thin films used for organic light-emitting diodes. The total dopant concentrations estimated by HPLC for films of 4,4'-bis(carbazol-9-yl) biphenyl (CBP) doped with tris(2-phenylpyridinato)iridium(III) (Ir(ppy)(3)) are consistent with those measured by quartz crystal microbalances (QCMs) during the deposition. Concentrations measured for Ir(ppy) 3: CBP films by HPLC and TOF-SIMS show a nearly linear relationship in the range of 1-8 wt. &#37;. At concentrations higher than 8 wt. &#37;, TOF-SIMS values significantly deviate because of the matrix effect. The depth profile of the dopant concentration measured by TOF-SIMS was in good agreement with that measured by QCMs during film deposition for concentrations below 8 wt. &#37;. These methods are especially useful for comparing the dopant concentration of films deposited in different batches and equipment. (C) 2014 American Vacuum Society.

    DOI: 10.1116/1.4871756

  • Structural and mechanistic insights into an Fe3+-triggered quinazoline based molecular rotor 査読 国際誌

    Rampal Pandey; Gábor Méhes; Amit Kumar; Rakesh Kumar Gupta; Chihaya Adachi; Daya Shankar Pandey

    Chem. Comm.   50   8032 - 8035   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C4CC01917B

  • Temperature dependence of photoluminescence properties in a thermally activated delayed fluorescence emitter 査読

    Akitsugu Niwa, Takashi Kobayashi, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito

    APPLIED PHYSICS LETTERS   104 ( 21 )   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Using steady-state and time-resolved photoluminescence (PL) spectroscopy, we have investigated the temperature dependence of PL properties of 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN), which have a small energy gap between its singlet and triplet excited states and thus exhibits efficient thermally activated delayed fluorescence [H. Uoyama et al., Nature 492, 235 (2012)]. Below around 100 K, PL quantum efficiency of 4CzIPN thin films is largely suppressed and strong photoexcitation intensity dependence appears. These features can be explained by using rate equations for the densities of singlet and triplet excited states considering a triplet-triplet annihilation process. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4878397

  • High-efficiency organic light-emitting diodes with fluorescent emitters 査読

    Hajime Nakanotani, Takahiro Higuchi, Taro Furukawa, Kensuke Masui, Kei Morimoto, Masaki Numata, Hiroyuki Tanaka, Yuta Sagara, Takuma Yasuda, Chihaya Adachi

    NATURE COMMUNICATIONS   5 ( 4016 )   4016   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Fluorescence-based organic light-emitting diodes have continued to attract interest because of their long operational lifetimes, high colour purity of electroluminescence and potential to be manufactured at low cost in next-generation full-colour display and lighting applications. In fluorescent molecules, however, the exciton production efficiency is limited to 25&#37; due to the deactivation of triplet excitons. Here we report fluorescence-based organic light-emitting diodes that realize external quantum efficiencies as high as 13.4-18&#37; for blue, green, yellow and red emission, indicating that the exciton production efficiency reached nearly 100&#37;. The high performance is enabled by utilization of thermally activated delayed fluorescence molecules as assistant dopants that permit efficient transfer of all electrically generated singlet and triplet excitons from the assistant dopants to the fluorescent emitters. Organic light-emitting diodes employing this exciton harvesting process provide freedom for the selection of emitters from a wide variety of conventional fluorescent molecules.

    DOI: 10.1038/ncomms5016

  • Electrogenerated Chemiluminescence of Donor–Acceptor Molecules with Thermally Activated Delayed Fluorescence 査読 国際誌

    Ryoichi Ishimatsu; Shigeyuki Matsunami; Takashi Kasahara; Jun Mizuno; Tomohiko Edura; Chihaya Adachi; Koji Nakano; Toshihiko Imato

    Angew. Chem.   126 ( 27 )   7113 - 7116   2014年5月

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    記述言語:英語  

    DOI: 10.1002/ange.201402615

  • Luminous Butterflies: Efficient Exciton Harvesting by Benzophenone Derivatives for Full-Color Delayed Fluorescence OLEDs 査読 国際誌

    Sae Youn Lee; Takuma Yasuda; Yu Seok Yang; Qisheng Zhang; Chihaya Adachi

    Angew. Chem. Int. Ed.   126 ( 25 )   6520 - 6524   2014年5月

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    記述言語:英語  

    DOI: 10.1002/ange.201402992

  • A designed fluorescent anthracene derivative: Theory, calculation, synthesis, and characterization 査読

    Motoyuki Uejima, Tohru Sato, Masahiro Detani, Atsushi Wakamiya, Furitsu Suzuki, Hajime Suzuki, Tatsuya Fukushima, Kazuyoshi Tanaka, Yasujiro Murata, Chihaya Adachi, Hironori Kaji

    CHEMICAL PHYSICS LETTERS   602   80 - 83   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    5,11-Bis(phenylethynyl) benzo[1,2-f: 4,5-f'] diisoindole-1,3,7,9(2H,8H)-tetraone 1H was designed as an application of the theoretical design principle for fluorescent molecules which is derived from the vibronic coupling density analysis. For solubility reasons, tertiary-butylated 1H, 2,8-di-tert-butyl-5,11-bis(phenylethynyl)benzo[1,2-f: 4,5-f'] diisoindole-1,3,7,9(2H,8H)-tetraone 1 was synthesized and its fluorescence properties were measured. It is found that the photoluminescence quantum yield of 1 was 96&#37;. We discuss the rationale for designing 1H as a highly efficient fluorescent molecule, and compare the theoretical calculations for 1 with the observed absorption and photoluminescence spectra. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2014.04.017

  • Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence 査読

    Qisheng Zhang, Bo Li, Shuping Huang, Hiroko Nomura, Hiroyuki Tanaka, Chihaya Adachi

    NATURE PHOTONICS   8 ( 4 )   326 - 332   2014年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic light-emitting diodes (OLEDs) employing thermally activated delayed fluorescence (TADF) have emerged as cheaper alternatives to high-performance phosphorescent OLEDs with noble-metal-based dopants. However, the efficiencies of blue TADF OLEDs are still low at high luminance, limiting full-colour display. Here, we report a blue OLED containing a 9,10-dihydroacridine/ diphenyl sulphone derivative that has a comparable performance to today's best phosphorescent OLEDs. The device offers an external quantum efficiency of 19.5&#37; and reduced efficiency roll-off characteristics at high luminance. Through computational simulation, we identified six pretwisted intramolecular chargetransfer (CT) molecules with small singlet-triplet CT state splitting but different energy relationships between (CT)-C-3 and locally excited triplet ((LE)-L-3) states. Systematic comparison of their excited-state dynamics revealed that CT molecules with a large twist angle can emit efficient and short-lifetime (a few microseconds) TADF when the emission peak energy is high enough and the (LE)-L-3 state is higher than the (CT)-C-3 state.

    DOI: 10.1038/NPHOTON.2014.12

  • Light-emitting organic field-effect transistors based on highly luminescent single crystals of thiophene/phenylene co-oligomers 査読 国際誌

    Takahiro Komori; Hajime Nakanotani; Takuma Yasuda; Chihaya Adachi

    J. Mater. Chem. C,   2   4918 - 4921   2014年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C4TC00164H

  • Flexible Porous Bismuth Telluride Thin Films with Enhanced Figure of Merit using Micro-Phase Separation of Block Copolymer 査読

    Kunihisa Kato, Yoshika Hatasako, Michitaka Uchino, Yasukazu Nakata, Yoshinori Suzuki, Teruaki Hayakawa, Chihaya Adachi, Koji Miyazaki

    ADVANCED MATERIALS INTERFACES   1 ( 2 )   2014年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/admi.201300015

  • Comparison of small amounts of polycrystalline donor materials in C-70-based bulk heterojunction photovoltaics and optimization of dinaphthothienothiophene based photovoltaic 査読

    Yan-qiong Zheng, William J. Potscavage, Qi-sheng Zhang, Takeshi Komino, Masatsugu Taneda, Chihaya Adachi

    ORGANIC ELECTRONICS   15 ( 4 )   878 - 885   2014年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Comparative studies of the effects of a series of polycrystalline donors on the performance of 95 wt.&#37;-C-70-based bulk-heterojunction (BHJ) photovoltaics were conducted. A BHJ based on the wide band-gap molecule dinaphthothienothiophene (DNTT) shows power conversion efficiency (eta(PCE)) of up to 4.28&#37;. The photovoltaic parameters are superior to those of devices using the similar molecule pentacene (PEN) or polycrystalline copper phthalocyanine (CuPc) for donor concentrations from 5 to 30 wt.&#37;. The low-lying DNTT ionization potential and the high mu(h) in the DNTT blend support the excellent DNTT device performance. The low performance of BHJs with 5 wt.&#37; PEN and 5 wt.&#37; CuPc may stem from strong exciplex recombination in the PEN: C-70 blend and limited hole mobility combined with geminate polaron-pair recombination in the CuPc: C-70 blend. The zero-field hole mobility of the blends with 5 wt.&#37; donor has a positive correlation with the corresponding device performance. The eta(PCE) of a 5 wt.&#37;-DNTT BHJ cell was improved to 4.92&#37; by optimizing the cathode buffer layer. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2014.01.012

  • A six-carbazole-decorated cyclophosphazene as a host with high triplet energy to realize efficient delayed-fluorescence OLEDs 査読

    Takuro Nishimoto, Takuma Yasuda, Sae Youn Lee, Ryosuke Kondo, Chihaya Adachi

    MATERIALS HORIZONS   1 ( 2 )   264 - 269   2014年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A high triplet energy (ET) host material, hexakis(9H-carbazol-9-yl) cyclotriphosphazene (PzCz), is used in high-efficiency organic light-emitting diodes (OLEDs). PzCz (E-T = 3.00 eV) functions as an effective host for thermally activated delayed fluorescence (TADF) molecules. Highest external electroluminescence quantum efficiencies over 15&#37; and 18&#37; are achieved for blue-green and green TADF-OLEDs, respectively.

    DOI: 10.1039/c3mh00079f

  • Enhanced out-coupling efficiency of organic light-emitting diodes using an nanostructure imprinted by an alumina nanohole array 査読

    Kuniaki Endo, Chihaya Adachi

    APPLIED PHYSICS LETTERS   104 ( 12 )   2014年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate organic light-emitting diodes (OLEDs) with enhanced out-coupling efficiency containing nanostructures imprinted by an alumina nanohole array template that can be applied to large-emitting-area and flexible devices using a roll-to-roll process. The nanostructures are imprinted on a glass substrate by an ultraviolet nanoimprint process using an alumina nanohole array mold and then an OLED is fabricated on the nanostructures. The enhancement of out-coupling efficiency is proportional to the root-mean-square roughness of the nanostructures, and a maximum improvement of external electroluminescence quantum efficiency of 17&#37; is achieved. The electroluminescence spectra of the OLEDs indicate that this improvement is caused by enhancement of the out-coupling of surface plasmon polaritons. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4869468

  • Self-assembly, Physicochemical, and Field-effect Transistor Properties of Solution-crystallized Organic Semiconductors Based on pi-Extended Dithieno[3,2-b:2 ',3 '-d]thiophenes 査読

    Hiroyuki Mieno, Takuma Yasuda, Yu Seok Yang, Chihaya Adachi

    CHEMISTRY LETTERS   43 ( 3 )   293 - 295   2014年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thienoacene-based pi-conjugated oligomers, DTT-NP8 and DTT-BT8, were designed and synthesized. Their strong intermolecular interactions originating from S S contacts enable the fabrication of single-crystal microribbons via solution processing. Organic single-crystal transistors exhibited field-effect mobilities as high as 0.54 cm(2) s(-1) and on/off current ratio of ca. 10(6).

    DOI: 10.1246/cl.130914

  • Dicarbazolyldicyanobenzenes as Thermally Activated Delayed Fluorescence Emitters: Effect of Substitution Position on Photo luminescent and Electroluminescent Properties 査読

    Bo Li, Hiroko Nomura, Hiroshi Miyazaki, Qisheng Zhang, Kou Yoshida, Yoshinori Suzuma, Akihiro Orita, Junzo Otera, Chihaya Adachi

    CHEMISTRY LETTERS   43 ( 3 )   319 - 321   2014年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate two efficient blue-green thermally activated delayed fluorescence (TADF) compounds comprising a dimeric phenylcarbazole and four cyano substituents on the phenyl rings. A comparison of the 2,6-dicyano-substituted derivative (26IPNDCz) with the 3,5-dicyano-substituted derivative (35IPNDCz) shows that 26IPNDCz provides a larger dihedral angle and a lower decrease in the energy difference between the first singlet and triplet excited states (Delta E-ST) and the TADF lifetime. An organic light-emitting diode based on 26IPNDCz afforded an external quantum efficiency of 10&#37; with reduced efficiency roll-off.

    DOI: 10.1246/cl.130907

  • 100 m-Order Patterning of Organic Semiconductor Layers Using a Thermally Converted Precursor Technique and its Application to Organic Light Emitting Diodes 査読

    Daisuke Goto, Masataka Mohri, Kei Morimoto, Aleksandre Mzhavia, Chihaya Adachi

    ADVANCED OPTICAL MATERIALS   2 ( 2 )   110 - 114   2014年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adom.201300372

  • NEAR INFRARED PHOTO-DETECTOR USING SELF-ASSEMBLED FORMATION OF ORGANIC CRYSTALLINE NANOPILLAR ARRAYS 査読

    Yoshiharu Ajiki, Tetsuo Kan, Masayuki Yahiro, Akiko Hamada, Junji Adachi, Chihaya Adachi, Kiyoshi Matsumoto, Isao Shimoyama

    2014 IEEE 27TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS)   147 - 150   2014年1月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We proposed a near infrared photo-detector (NIR-PD) using self-assembled formation of organic crystalline arrays, which were formed on an n-type silicon (n-Si) substrate and covered with an Au film. These structures act as antennas for near infrared (NIR) light, resulting in an enhancement of the light absorption on the Au film. The NIR-PDs thus have higher photo-responsivity compared with that of an Au/n-Si typed Schottky diodes, which was fabricated as a reference. In this paper, the fabrication process of the NIR-PDs and the estimation results of photo-responsivity were described. The maximum responsivity to NIR light (wavelength = 1.2 mu m) was 1.79 mA/W without applying forward bias. This value is 10 times larger than the responsivity of the Au/n-Si typed Schottky diode as a reference.

  • MICROFLUIDIC ELECTROCHEMILUMINESCENCE (ECL) INTEGRATED FLOW CELL FOR PORTABLE FLUORESCENCE DETECTION 査読

    Miho Tsuwaki, Jun Mizuno, Takashi Kasahara, Tomohiko Edura, Eri Kunisawa, Ryoichi Ishimatsu, Shigeyuki Matsunami, Toshihiko Imato, Chihaya Adachi, Shuichi Shoji

    2014 IEEE 27TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS)   108 - 111   2014年1月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We propose a portable electrochemiluminescence (ECL)-induced fluorescence chip which consists of flow channels for fluorescence sample and multi-color emitting ECL excitation source. A prototype ECL-induced fluorescence chip was fabricated by conventional photolithography and bonding technique. Device performance was evaluated using ECL of rubrene as excitation source and resorufin as fluorescent dye. Fluorescence of 500 mu M resorufin (600 nm) was successfully detected using 10 mM rubrene solution (560 nm) under the applied voltage of 4 V. The proposed principle is applicable for portable and on-demand multi fluorescence detection device using its freedom of choice for combination of the ECL light source.

  • Understanding extrinsic degradation in phosphorescent OLEDs 査読

    Hitoshi Yamamoto, Michael S. Weaver, Hideyuki Murata, Chihaya Adachi, Julie J. Brown

    Digest of Technical Papers - SID International Symposium   45 ( 1 )   758 - 761   2014年1月

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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    We quantified water as an impurity in OLEDs and investigated how the water level impacts initial lifetime decay. We also demonstrated a two to three fold increase in lifetime for blue and green phosphorescent OLEDs by reducing the amount of water in the devices. © 2014 Society for Information Display.

    DOI: 10.1002/j.2168-0159.2014.tb00199.x

  • Promising operational stability of high-efficiency organic light-emitting diodes based on thermally activated delayed fluorescence (vol 3, 2127, 2013) 査読

    Hajime Nakanotani, Kensuke Masui, Junichi Nishide, Takumi Shibata, Chihaya Adachi

    SCIENTIFIC REPORTS   4   2014年1月

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    記述言語:英語  

    DOI: 10.1038/srep03640

  • An organic thin film photodiode as a portable photodetector for the detection of alkylphenol polyethoxylates by a flow fluorescence-immunoassay on magnetic microbeads in a microchannel 査読

    Ryoichi Ishimatsu, Azusa Naruse, Rong Liu, Koji Nakano, Masayuki Yahiro, Chihaya Adachi, Toshihiko Imato

    TALANTA   117   139 - 145   2013年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    An organic thin film photodiode (OPD) was successfully employed as a portable photodetector in a competitive enzyme-linked immunosorbent assay (ELISA) of a class of nonionic surfactants, namely alkylphenol polyethoxylates (APnEOs) which are an environmental pollutant. Microbeads that were chemically immobilized with an anti-APnEOs antibody were used in the assay. The OPD consisted of a layer of copper phthalocyanine (CuPc), C-60 and a second layer of bathocuproine (BCP) with a bulk heterojunction composed of CuPc and Ca-60 prepared by a vapor deposition method on an indium-tin oxide coated glass substrate. The OPD showed an incident photon-current efficiency (IPCE) of approximately 19&#37; for light at a wavelength of 585 nm. This relatively high IPCE at 585 nm makes it suitable for detecting the fluorescence of resorufin (lambda(em)=585 nm), the product of the competitive ELISA, produced through the enzymatic reaction of Amplex Red with horseradish peroxidase (HRP) and H2O2. A fluorometric detector was assembled on a microchip by combining the fabricated OPD and a commercial LED as a photodetector and a light source, respectively. The photocurrent of the OPD due to the fluorescence of resorufin was proportional to the concentration of resorufin in the concentration range from 0 to 8 mu M. When the fabricated OPD was used as a portable photodetector, the competitive ELISA of APnEOs using HRP labeled APnEOs (HRP-APnEOs) was performed on magnetic microbeads on which surface an anti-APnEOs antibody had been immobilized. A typical sigmoidal calibration curve was obtained and the data were in good agreement with a numerical simulation, where the photocurrent of the OPD was plotted against the concentration of APnEOs, determined via the competitive ELISA. The detection limit of the immunoassay for APnEOs was approximately 2 and 4 ppb in batch and flow system, respectively. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.talanta.2013.08.044

  • Formation of high-purity organic thin films by gas flow deposition and the effect of impurities on device characteristics 査読

    Kohei Tsugita, Tomohiko Edura, Masayuki Yahiro, Chihaya Adachi

    DISPLAYS   34 ( 5 )   418 - 422   2013年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A gas flow deposition (GFD) system was developed to manufacture large-scale organic light-emitting diodes (OLEDs). A N,N'-di(1-naphthyl)-N,N'-diphenylbenzidine (alpha-NPD) thin film with a high purity of 99.97&#37; was obtained using the GFD system. The film properties such as morphology, and electrical and optical characteristics were almost the same as those of films made by conventional vacuum thermal evaporation. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.displa.2013.08.008

  • Mixing Effect of Gold and Silver Nanoparticles on Enhancement in Performance of Organic Thin-Film Solar Cells 査読

    Tsuyoshi Akiyama, Tomoki Yamamoto, Takeo Oku, Masayuki Yahiro, Takashi Kurihara, Chihaya Adachi, Sunao Yamada

    JAPANESE JOURNAL OF APPLIED PHYSICS   52 ( 12 )   1 - 122301   2013年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Bulk-heterojunction organic thin-film solar cells incorporating gold and silver nanoparticles were fabricated and evaluated. These nanoparticles were embedded in the hole-transport layer of the solar cells. Plasmonic absorption peaks of isolated gold and silver nanoparticles were confirmed from extinction spectra even in the hole-transport material. The incorporation of gold and silver nanoparticles increased the photoelectric conversion efficiency of organic thin-film solar cells, whose enhancement ratio was further increased by mixing gold and silver nanoparticles. (C) 2013 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.52.122301

  • A highly luminescent spiro-anthracenone-based organic light-emitting diode exhibiting thermally activated delayed fluorescence 査読

    Keiro Nasu, Tetsuya Nakagawa, Hiroko Nomura, Chi-Jen Lin, Chien-Hong Cheng, Mei-Rurng Tseng, Takuma Yasuda, Chihaya Adachi

    CHEMICAL COMMUNICATIONS   49 ( 88 )   10385 - 10387   2013年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Efficient thermally activated delayed fluorescence was observed from a spiro-anthracenone derivative (ACRSA). An organic light-emitting diode containing ACRSA exhibited blue-greenish electroluminescence with a maximum external quantum efficiency of 16.5&#37;.

    DOI: 10.1039/c3cc44179b

  • Systematic Conversion of Single Walled Carbon Nanotubes into n-type Thermoelectric Materials by Molecular Dopants 査読

    Yoshiyuki Nonoguchi, Kenji Ohashi, Rui Kanazawa, Koji Ashiba, Kenji Hata, Tetsuya Nakagawa, Chihaya Adachi, Tomoaki Tanase, Tsuyoshi Kawai

    SCIENTIFIC REPORTS   3 ( 3344 )   3344   2013年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermoelectrics is a challenging issue for modern and future energy conversion and recovery technology. Carbon nanotubes are promising active thermoelectic materials owing to their narrow bandgap energy and high charge carrier mobility, and they can be integrated into flexible thermoelectrics that can recover any waste heat. We here report air-stable n-type single walled carbon nanotubes with a variety of weak electron donors in the range of HOMO level between ca. -4.4 eV and ca. -5.6 eV, in which partial uphill electron injection from the dopant to the conduction band of single walled carbon nanotubes is dominant. We display flexible films of the doped single walled carbon nanotubes possessing significantly large thermoelectric effect, which is applicable to flexible ambient thermoelectric

    DOI: 10.1038/srep03344(2013)

  • Systematic Conversion of Single Walled Carbon Nanotubes into n-type Thermoelectric Materials by Molecular Dopants 査読

    Yoshiyuki Nonoguchi, Kenji Ohashi, Rui Kanazawa, Koji Ashiba, Kenji Hata, Tetsuya Nakagawa, Chihaya Adachi, Tomoaki Tanase, Tsuyoshi Kawai

    SCIENTIFIC REPORTS   3   2013年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermoelectrics is a challenging issue for modern and future energy conversion and recovery technology. Carbon nanotubes are promising active thermoelectic materials owing to their narrow bandgap energy and high charge carrier mobility, and they can be integrated into flexible thermoelectrics that can recover any waste heat. We here report air-stable n-type single walled carbon nanotubes with a variety of weak electron donors in the range of HOMO level between ca. -4.4 eV and ca. -5.6 eV, in which partial uphill electron injection from the dopant to the conduction band of single walled carbon nanotubes is dominant. We display flexible films of the doped single walled carbon nanotubes possessing significantly large thermoelectric effect, which is applicable to flexible ambient thermoelectric

    DOI: 10.1038/srep03344(2013)

  • Polymorphism in 9,9-diarylfluorene-based organic semiconductors: influence on optoelectronic functions 査読 国際誌

    Jun Yun Kim; Takuma Yasuda; Yu Seok Yang; Naoki Matsumto; Chihaya Adachi

    Chem. Commun   50   1523 - 1526   2013年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C3CC48566H

  • Analysis of exciton annihilation in high-efficiency sky-blue organic light-emitting diodes with thermally activated delayed fluorescence 査読

    Kensuke Masui, Hajime Nakanotani, Chihaya Adachi

    ORGANIC ELECTRONICS   14 ( 11 )   2721 - 2726   2013年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We study external quantum efficiency (eta(EQE)) roll-off in organic light-emitting diodes (OLEDs) using thermally-activated delayed fluorescence (TADF) of 4,5-di (9H-carbazol-9-yl) phthalonitrile (2CzPN). Using 2CzPN intramolecular rate constants from optical analyses, we construct an exciton quenching model incorporating intersystem crossing and reverse intersystem crossing. The model indicates that singlet-triplet annihilation and triplet-triplet annihilation dominate eta(EQE) roll-off because of the relatively long 2CzPN triplet lifetime of 273 mu s. This work yields a method to relax the exciton quenching process in TADF based OLEDs. (C) 2013 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.orgel.2013.07.010

  • Multi-color light-emitting transistors composed of organic single crystals 査読 国際誌

    CHIHAYA ADACHI

    ORGANIC ELECTRONICS   14 ( 11 )   2013年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.orgel.2013.07.025

  • Plasma-tolerant structure for organic light-emitting diodes with aluminum cathodes fabricated by DC magnetron sputtering: Using a Li-doped electron transport layer 査読 国際誌

    CHIHAYA ADACHI

    ORGANIC ELECTRONICS   14 ( 11 )   2013年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.orgel.2013.08.020

  • Enhanced electroluminescence based on thermally activated delayed fluorescence from a carbazole-triazine derivative 査読

    Tomas Serevicius, Tetsuya Nakagawa, Ming-Cheng Kuo, Shuo-Hsien Cheng, Ken-Tsung Wong, Chih-Hao Chang, Raymond C. Kwong, Sean Xia, Chihaya Adachi

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   15 ( 38 )   15850 - 15855   2013年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermally activated delayed fluorescence (TADF) properties of a dicarbazole-triazine compound, 9-(4,6diphenyl-1,3,5-triazin-2-yl)-9'-phenyl-3,3'-bicarbazole (CzT), and its OLED characteristics were investigated. An estimated small energy gap of about 90 meV between the singlet and triplet energy states of CzT made the up-conversion of triplet excitons back to a singlet state possible. The origin of the observed delayed fluorescence has been shown to be thermally activated delayed fluorescence. An organic light emitting diode (OLED) with CzT as an emitter showed the maximum external quantum efficiency (EQE) of 6&#37;. For comparison, another carbazole-triazine derivative of 3-(2'-( 4,6-diphenyl-1,3,5-triazin-2-yl)[1,1'-biphenyl]-2-yl)-9-phenyl-9H-carbazole (PhCzTAZ) with a similar structure was also studied. PhCzTAZ showed a low fluorescence quantum yield with no TADF.

    DOI: 10.1039/c3cp52255e

  • 常温大気中で高効率蓄光機能を示す有機材料 査読

    平田修造, 安達千波矢, 渡辺敏行, 戸谷健朗

    KOBUNSHI RONBUNSHU   70 ( 11 )   623 - 636   2013年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    Efficient Persistent Room Temperature Phosphorescence in Organic Materials

    DOI: 10.1295/koron.70.623

  • Multi-layered organic light-emitting diode fabrication using low molecular weight materials by electrospray method 査読

    Yasushi Koishikawa, Hiroshi Miyazaki, Masayuki Yahiro, Chihaya Adachi

    Thin Solid Films   545   527 - 532   2013年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Active technology development efforts to improve the productivity of organic light emitting diode (OLED) fabrication using wet processes based on ink-jet technology have been conducted by taking advantage of the low cost and large area processability of organic materials.However, OLEDs formed by conventional wet processes have been unable to reproduce the high performance levels of OLEDs that were mass-produced by dry processes based on vacuum deposition.We have therefore focused on the electrospray (ES) method as a potential fabrication technology.In this paper, we report on a multilayer thin-film fabrication process with low molecular-weight materials using an ES method that allows atomization of the organic materials by Coulomb repulsion and successive adhesion of solid-state multi-layered thin films.We demonstrate OLED fabrication by this ES method and the characteristics of the resulting devices.© 2013 Elsevier B.V.All rights reserved.

    DOI: 10.1016/j.tsf.2013.07.083

  • Twisted Intramolecular Charge Transfer State for Long-Wavelength Thermally Activated Delayed Fluorescence 査読

    Hiroyuki Tanaka, Katsuyuki Shizu, Hajime Nakanotani, Chihaya Adachi

    CHEMISTRY OF MATERIALS   25 ( 18 )   3766 - 3771   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Emission wavelength tuning of thermally activated delayed fluorescence from green to orange in solid state films is demonstrated. Emission tuning occurs by stabilization of the intramolecular charge transfer state between a phenoxazine (PXZ) donor unit and 2,4,6-triphenyl-1,3,5-triazine (TRZ) acceptor unit separated by a large twist angle. The emission wavelengths of mono-, bis-, and tri-PXZ-substituted TRZ exhibit a gradual red shift while maintaining a small energy gap between the singlet and triplet excited states. An organic light-emitting diode containing a tri-PXZ-TRZ emitter exhibited a maximum external quantum efficiency of 13.3 +/- 0.5&#37; with yellow-orange emission.

    DOI: 10.1021/cm402428a

  • Computational prediction for singlet- and triplet-transition energies of charge-transfer compounds 査読

    Shuping Huang, Qisheng Zhang, Yoshihito Shiota, Tetsuya Nakagawa, Kazuhiro Kuwabara, Kazunari Yoshizawa, Chihaya Adachi

    Journal of Chemical Theory and Computation   9 ( 9 )   3872 - 3877   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Our work reveals a high dependence on charge-transfer (CT) amounts for the optimal Hartree-Fock percentage in the exchange-correlation functional of time-dependent density functional theory (TD-DFT) and the error of a vertical transition energy calculated by a given functional. Using these relations, the zero-zero transition energies of the first singlet and first triplet excited states of various CT compounds are accurately reproduced. 3CT and locally excited triplet (3LE) states are well distinguished and calculated independently. © 2013 American Chemical Society.

    DOI: 10.1021/ct400415r

  • Capacitance-voltage characteristics of a 4,4 '-bis[(N-carbazole)styryl]biphenyl based organic light-emitting diode: Implications for characteristic times and their distribution 査読

    Le Zhang, Hajime Nakanotani, Chihaya Adachi

    APPLIED PHYSICS LETTERS   103 ( 9 )   2013年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The characteristic times and their distributions of a fluorescent 4,4'-bis[(N-carbazole)styryl]biphenyl-based organic light-emitting diode (OLED) were studied using impedance spectroscopy. The four defined characteristic times (transit time, recombination time, trapping time, and ac characteristic time) and their dc bias dependences were obtained from the frequency dependence of capacitance. The trapped carrier density distribution in the time domain was revealed from the voltage dependence of the OLED. The relative value of each characteristic time is suggested to play an important role in determining the profile of the frequency-and voltage-dependent capacitance of OLEDs. (C) 2013 AIP Publishing LLC.

    DOI: 10.1063/1.4819436

  • Suppression of Efficiency Roll-Off Characteristics in Thermally Activated Delayed Fluorescence Based Organic Light-Emitting Diodes Using Randomly Oriented Host Molecules 査読

    Takeshi Komino, Hiroko Nomura, Takahiro Koyanagi, Chihaya Adachi

    CHEMISTRY OF MATERIALS   25 ( 15 )   3038 - 3047   2013年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The efficiency roll-off characteristics in highly efficient thermally activated delayed fluorescence (TADF) based organic light-emitting diodes (OLEDs) were effectively suppressed by controlling the molecular orientation of a 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP) host matrix. The hole mobility in the light 2 emitting layer was found to govern the magnitude of this suppression. Three-dimensional finite-difference time-domain calculations and photoluminescence quantum yield measurements revealed that the optical characteristics of the fabricated devices and photophysical properties of the TADF emitter did not affect efficiency roll-off CBP molecules adopted random orientations when films were fabricated at high temperature (350 K), resulting in low hole mobility, and shifting the recombination zone away from the interface of the emitting layer with the electron transporting layer. When CBP was randomly orientated, efficiency roll-off was suppressed by 30&#37; at a current density of 100 mA cm(-2). This result indicates that control of the molecular orientation of the host can allow us to indirectly tune the carrier balance in OLEDs.

    DOI: 10.1021/cm4011597

  • Efficient Persistent Room Temperature Phosphorescence in Organic Amorphous Materials under Ambient Conditions 査読

    Shuzo Hirata, Kenro Totani, Junxiang Zhang, Takashi Yamashita, Hironori Kaji, Seth R. Marder, Toshiyuki Watanabe, Chihaya Adachi

    ADVANCED FUNCTIONAL MATERIALS   23 ( 27 )   3386 - 3397   2013年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Persistent emission with a long lifetime (>1 s) from organic materials can only be observed at a low temperature, because of the significant nonradiative deactivation pathway that occurs at room-temperature (RT). If organic materials with persistent RT emission in air could be developed, they could potentially be utilized for a variety of applications. Here, organic host-guest materials with efficient persistent RT phosphorescence (RTP) are developed by minimizing the nonradiative deactivation pathway of triplet excitons. The nonradiative deactivation pathway is dependent on both nonradiative deactivation of the guest and quenching by diffusional motion of the host. The rigidity and oxygen barrier properties of the steroidal compound used as the host suppressed the quenching, and the aromatic hydrocarbon used as the guest is highly deuterated to minimize nonradiative deactivation of the guest. Red-green-blue persistent RTP with a lifetime >1 s and a quantum yield >10&#37; in air is realized for a pure organic material.

    DOI: 10.1002/adfm.201203706

  • Solvent Effect on Thermally Activated Delayed Fluorescence by 1,2,3,5-Tetrakis(carbazol-9-yl)-4,6-dicyanobenzene 査読

    Ryoichi Ishimatsu, Shigeyuki Matsunami, Katsuyuki Shizu, Chihaya Adachi, Koji Nakano, Toshihiko Imato

    JOURNAL OF PHYSICAL CHEMISTRY A   117 ( 27 )   5607 - 5612   2013年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermally activated delayed fluorescence (TADF) is fluorescence arising from a reverse intersystem crossing (RISC) from the lowest triplet (T-1) to the singlet excited state (S-1), where these states are separated by a small energy gap (Delta E-st), followed by a radiative transition to the ground state (S-0). Rate constants relating TADF processes in 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) were determined at four different solvent polarities (toluene, dichloromethane, ethanol, and acetonitrile). We revealed that the rate constant of RISC, k(RISC), which is the most important factor for TADF, was significantly enhanced by a reduced Delta E-st, in more polar solvents. The smaller Delta E-st was mainly attributable to a stabilization of the S-1 state. This stabilization also induced a Stokes shift in fluorescence through a relatively large change of the dipole moment between S-1 and S-0 states (17 D). Despite of this factor, we observed a negative correlation between Delta E-st and efficiency of the delayed fluorescence (phi(d)). This was ascribed to a lower intersystem crossing rate, k(ISC), and increase nonradiative decay from S-1, k(nt)(s), in polar solvents.

    DOI: 10.1021/jp404120s

  • Promising operational stability of high-efficiency organic light-emitting diodes based on thermally activated delayed fluorescence 査読 国際誌

    CHIHAYA ADACHI

    SCIENTIFIC REPORTS   3   2013年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/srep02127

  • Droplet Manipulation by an External Electric Field for Crystalline Film Growth 査読

    Takeshi Komino, Hirokazu Kuwabara, Masaaki Ikeda, Masayuki Yahiro, Kazuo Takimiya, Chihaya Adachi

    LANGMUIR   29 ( 30 )   9592 - 9597   2013年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Combining droplet manipulation by the application of an electric field with inkjet printing is proposed as a unique technique to control the surface wettability of substrates for solution-processed organic field-effect transistors (FETs). With the use of this technique, uniform thin films of 2,7-dioctyl[1]benzothieno[2,3,-b][1]benzothiopene (C-8-technique, uniform thin films of 2,7-dioctyl[1]benzothieno[2,3,-b][1]benzothiopene (C-8-BTBT) could be fabricated on the channels of FET substrates without self-assembled monolayer treatment. High-speed camera observation revealed that the crystals formed at the solid/liquid interface. The coverage of the crystals on the channels depended on the ac frequency of the external electric field applied during film formation, leading to a wide variation in the carrier transport of the films. The highest hole mobility of 0.03 cm(2) V-1 s(-1) was obtained when the coverage was maximized with an ac frequency of 1 kHz.

    DOI: 10.1021/la401729k

  • High performance organic field-effect transistors based on single-crystal microribbons and microsheets of solution-processed dithieno[3,2-b:2′, 3′-d]thiophene derivatives 査読

    Yu Seok Yang, Takuma Yasuda, Hayato Kakizoe, Hiroyuki Mieno, Hiori Kino, Yoshitaka Tateyama, Chihaya Adachi

    Chemical Communications   49 ( 58 )   6483 - 6485   2013年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We present π-conjugated dithieno[3,2-b:2′,3′-d]thiophene derivatives that act as high-performance p-type organic semiconductors. These molecules self-organize into single-crystal microribbons or microsheets. High carrier mobilities of up to 10.2 cm&lt
    sup&gt
    2&lt
    /sup&gt
    V&lt
    sup&gt
    -1&lt
    /sup&gt
    s&lt
    sup&gt
    -1&lt
    /sup&gt
    and high on/off ratios of ∼10&lt
    sup&gt
    7&lt
    /sup&gt
    have been achieved in organic single-crystal field-effect transistors. © 2013 The Royal Society of Chemistry.

    DOI: 10.1039/c3cc42114g

  • Reversible Thermal Recording Media Using Time-Dependent Persistent Room Temperature Phosphorescence 査読

    Shuzo Hirata, Kenro Totani, Hironori Kaji, Martin Vacha, Toshiyuki Watanabe, Chihaya Adachi

    ADVANCED OPTICAL MATERIALS   1 ( 6 )   438 - 442   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adom.201300136

  • Amplified Spontaneous Emission and Electroluminescence from Thiophene/Phenylene Co-Oligomer-Doped p-bis(p-Styrylstyryl)Benzene Crystals 査読

    Hajime Nakanotani, Chihaya Adachi

    ADVANCED OPTICAL MATERIALS   1 ( 6 )   422 - 427   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adom.201200066

  • Fabrication and performance evaluation of microfluidic organic light emitting diode 査読

    Takashi Kasahara, Shigeyuki Matsunami, Tomohiko Edura, Juro Oshima, Chihaya Adachi, Shuichi Shoji, Jun Mizuno

    SENSORS AND ACTUATORS A-PHYSICAL   195   219 - 223   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this study, we fabricated a microfluidic organic light emitting diode (OLED) and evaluated its performance. The microchip consisted of a 3 x 3 matrix array of OLED pixels in SU-8 microchannels sandwiched by indium tin oxide (ITO) anode and cathode pairs. Liquid organic semiconductors introduced into the microchannels were employed as the light emitters. Electroluminescence was successfully observed at the emitting area of the microchannels. A current density of 0.298 mA/cm(2) was measured at 70V. In our prototype microfluidic OLED, the patterning of the liquid emitters was confirmed in the microchannels on a single chip. This result shows that the proposed structure can be applicable for liquid-based display. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.sna.2012.12.031

  • Oxadiazole- and Triazole-Based Highly-Efficient Thermally-Activated Delayed Fluorescence Emitters for Organic Light-Emitting Diodes 査読 国際誌

    CHIHAYA ADACHI

    J. Mater. Chem. C 2013, 1, 4599-4604.   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Self-Organizing Mesomorphic Diketopyrrolopyrrole Derivatives for Efficient Solution-Processed Organic Solar Cells 査読

    Woong Shin, Takuma Yasuda, Go Watanabe, Yu Seok Yang, Chihaya Adachi

    CHEMISTRY OF MATERIALS   25 ( 12 )   2549 - 2556   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We describe the synthesis, self-organization, and photovoltaic properties of diketopyrrolopyrrole (DPP)-based mesomorphic small-molecule materials, 3,6-bis{5-(4-alkylphenyl)thiophen-2-yl}-2,5-di(2-ethylhexyl)-pyrrolo[3,4-c]-pyrrole-1,4-diones (DPP-TP6 and DPP-TP12), which have strong visible absorption characteristics. The effects of varying terminal alkyl chains on the self-assembling properties and photovoltaic device performances have been studied. With the appropriate ratio of the lengths of the alkyl chains to its rigid DPP core, DPP-TP6 exhibits liquid-crystalline properties and forms well-developed nanostructured bulk heterojunction (BHJ) architectures with a fullerene derivative (PC71BM). Organic solar cells (OSCs) employing BHJ DPP-TP6:PC71BM films show a power conversion efficiency as high as 4.3&#37; with a high open-circuit voltage of 0.93 V and a fill factor of 0.55. These results demonstrate that liquid-crystalline organization to direct molecular self-assembly is a promising strategy for fabricating high-performance solution-processed small-molecule OSCs.

    DOI: 10.1021/cm401244x

  • Organic luminescent molecule with energetically equivalent singlet and triplet excited states for organic light-emitting diodes 査読

    Keigo Sato, Katsuyuki Shizu, Kazuaki Yoshimura, Atsushi Kawada, Hiroshi Miyazaki, Chihaya Adachi

    Physical Review Letters   110 ( 24 )   247401   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate an organic molecule with an energy gap between its singlet and triplet excited states of almost zero (ΔEST∼0 eV). Such separation was realized through proper combination of an electron-donating indolocarbazole group and a diphenyltriazine electron-accepting moiety. Calculated and measured ΔEST were 0.003 and 0.02 eV, respectively. A total photoluminescence efficiency of 59&#37;±2&#37; with 45&#37;±2&#37; from a delayed component and 14&#37;±2&#37; from a prompt component was obtained for a doped film. Organic light emitting diodes containing this molecule as an emitting dopant exhibited an unexpectedly high external electroluminescence efficiency of ηEQE=14&#37;±1&#37;. © 2013 American Physical Society.

    DOI: 10.1103/PhysRevLett.110.247401

  • Highly Efficient Organic Light-Emitting Diode Based on a Hidden Thermally Activated Delayed Fluorescence Channel in a Heptazine Derivative 査読

    Jie Li, Tetsuya Nakagawa, James MacDonald, Qisheng Zhang, Hiroko Nomura, Hiroshi Miyazaki, Chihaya Adachi

    ADVANCED MATERIALS   25 ( 24 )   3319 - 3323   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/adma.201300575

  • Bifunctional star-burst amorphous molecular materials for OLEDs: Achieving highly efficient solid-state luminescence and carrier transport induced by spontaneous molecular orientation 査読

    Jun Yun Kim, Takuma Yasuda, Yu Seok Yang, Chihaya Adachi

    Advanced Materials   25 ( 19 )   2666 - 2671   2013年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Bifunctional star-burst amorphous molecular materials displaying both efficient solid-state luminescence and high hole-transport properties are developed in this study. A high external electroluminescence quantum efficiency up to 5.9&#37; is attained in OLEDs employing the developed amorphous materials. It is revealed that the spontaneous horizontal orientation of these light-emitting molecules in their molecular-condensed states leads to a remarkable enhancement of the electroluminescence efficiencies and carrier-transport properties. Copyright © 2013 WILEY-VCH Verlag GmbH &amp
    Co. KGaA, Weinheim.

    DOI: 10.1002/adma.201204902

  • Photo-patternable electroluminescence based on one-way photoisomerization reaction of tetraoxidized triangle terarylenes 査読 国際誌

    Maki Taguchi, Tetsuya Nakagawa, Takuya Nakashima, CHIHAYA ADACHI

    Chem. Comm.   2013年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C3CC41825A

  • A host material consisting of a phosphinic amide directly linked donor-acceptor structure for efficient blue phosphorescent organic light-emitting diodes 査読

    Atsushi Wada, Takuma Yasuda, Qisheng Zhang, Yu Seok Yang, Isao Takasu, Shintaro Enomoto, Chihaya Adachi

    Journal of Materials Chemistry C   1 ( 13 )   2404 - 2407   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A host material with a high triplet excited-state energy level and a deep HOMO energy level has been developed by directly linking the donor and acceptor units through a phosphinic amide. Phosphorescent organic light-emitting diodes containing this material and a deep-blue dopant achieved an external quantum efficiency of 19.7&#37;. © The Royal Society of Chemistry 2013.

    DOI: 10.1039/c3tc00939d

  • Molecular Design of High Molecular Orientation Electron Transport Materials and Application to Organic Light-Emitting Diodes 査読 国際誌

    Kazunori Togashi, Yuta Sagara, Takuma Yasuda, CHIHAYA ADACHI

    Chem. Lett. 3013, 42, in press.   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Highly efficient bulk heterojunction photovoltaic cells based on C 70 and tetraphenyldibenzoperiflanthene 査読

    Yan-Qiong Zheng, William J. Potscavage, Takeshi Komino, Masaya Hirade, Junji Adachi, Chihaya Adachi

    Applied Physics Letters   102 ( 14 )   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Highly efficient photovoltaic cells based on a bulk heterojunction configuration composed of C70 with various donor materials at 5 wt.&#37; donor concentration were fabricated. The tetraphenyldibenzoperiflanthene (DBP) donor achieved the highest power conversion efficiency (ηPCE) of 6.4&#37; for the optimized cell. The improved performance with DBP arises from a combination of a higher absorption coefficient than 1,1-bis-(4-bis(4-methyl- phenyl)-amino-phenyl)-cyclohexane and a symmetrical molecular structure. The high ηPCE with only 5 wt. donor is attributed to a sufficient donor concentration for enhanced Frenkel exciton dissociation in C70, while efficiency and electron mobility decrease at higher donor concentrations. © 2013 AIP Publishing LLC.

    DOI: 10.1063/1.4801647

  • Highly efficient bulk heterojunction photovoltaic cell based on tris[4-(5-phenylthiophen-2-yl)phenyl]amine and C-70 combined with optimized electron transport layer 査読

    Yan-qiong Zheng, William J. Potscavage, Takeshi Komino, Chihaya Adachi

    APPLIED PHYSICS LETTERS   102 ( 15 )   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Efficient bulk heterojunction (BHJ) photovoltaic cells (PVs) based on 5 wt.&#37; donors and C-70 were fabricated. Tris[4-(5-phenylthiophen-2-yl)phenyl]-amine (TPTPA)-based BHJ PVs show higher power conversion efficiency (eta(PCE)) than aluminum phthalocyanine chloride-based BHJ PVs. Although the absorption of AlPcCl is complementary to that of C-70, TPTPA's high hole mobility and symmetrical molecular structure are likely to be crucial contributing factors to the higher eta(PCE). Phase separation occurs in the 5&#37;-TPTPA blend. The device was optimized via replacement of the bathocuproine buffer by a combination of 3,4,9,10-perylenetetracarboxylic bis-benzimidazole and bathocuproine. eta(PCE) of 5.96&#37; is achieved because of the decreased series resistance. (C) 2013 AIP Publishing LLC [http://dx.doi.org/10.1063/1.4801954]

    DOI: 10.1063/1.4801954

  • Reduced amplified spontaneous emission threshold in organic semiconductor laser structure with relaxed roll-off characteristics under high current densities 査読 国際誌

    Munetomo Inoue, Kenichi Goushi, Kuniaki Endo, Hiroko Nomura, CHIHAYA ADACHI

    Journal of Luminescence   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jlumin.2013.04.001

  • Triphenylene-based Host Materials for Low-voltage, Highly Efficient Red Phosphorescent Organic Light-emitting Diodes 査読

    Kazunori Togashi, Takuma Yasuda, Chihaya Adachi

    CHEMISTRY LETTERS   42 ( 4 )   383 - 385   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Triphenylene-based host materials BDBF-TP and BDBT-TP were synthesized for use in red phosphorescent organic light-emitting diodes (PHOLEDs). The current-voltage characteristics of hole- and electron-only devices revealed that BDBT-TP exhibits better bipolar carrier transport properties than 4,4'-bis(carbazol-9-yl)-1,1'-biphenyl and BDBF-TP. Red PHOLEDs containing BDBF-TP or BDBT-TP as the host showed a lower driving voltage, higher external quantum efficiency, and lower efficiency roll-off at high current density.

    DOI: 10.1246/cl.121247

  • Effects of Intramolecular Donor-Acceptor Interactions on Bimolecular Recombination in Small-Molecule Organic Photovoltaic Cells 査読 国際誌

    Masaya Hirade, Takuma Yasuda, CHIHAYA ADACHI

    JOURNAL OF PHYSICAL CHEMISTRY C   117 ( 10 )   4986 - 4991   2013年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp400386q

  • Reorganization of the molecular orientation at the organic/substrate interface in spirofluorene thin films 査読

    Takeshi Komino, Hiroko Nomura, Masayuki Yahiro, Chihaya Adachi

    CHEMICAL PHYSICS LETTERS   563   70 - 75   2013年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The thermal annealing treatment of an organic non-crystalline film of spirofluorene causes the randomization of the molecular orientation through molecular migration. However, the magnitude of the randomization depends on the depth in the film. The comparison of variable-angle spectroscopic ellipsometry, thermally stimulated current, and field-effect transistor characteristics measurements revealed that the molecular orientation in the bulk was randomized by annealing but was still partially maintained at the organic/substrate interface. This difference in condensed states between the interface and the bulk originates from a difference in glass transition temperature. (C) 2013 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.cplett.2013.01.056

  • Effects of Intramolecular Donor-Acceptor Interactions on Bimolecular Recombination in Small-Molecule Organic Photovoltaic Cells 査読

    Masaya Hirade, Takuma Yasuda, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   117 ( 10 )   4986 - 4991   2013年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To enhance the device performance of bulk heterojunction organic photovoltaic (OPV) cells, recombination processes must be suppressed. Here, we prepared OPV cells using donor materials composed of different electron-rich donor and electron-deficient acceptor units and the acceptor material 6,6-phenyl-C61-butyric acid methyl ester. The effects of the polarization of the donor materials which was induced by the intramolecular donor-acceptor (D-A) interactions on the bimolecular recombination constant of each device were studied using a time-of-flight method. A large D-A interaction decreased the bimolecular recombination constant, increasing the fill factor of the device. An active layer with a large dielectric constant led to a small Coulomb capture radius between the radical cations and anions. Overall, a larger D-A interaction enhanced the device performance of small-molecule OPV cells.

    DOI: 10.1021/jp400386q

  • Variable multi-color microfluidic organic light emitting device based on mixing of electrochemiluminescence solutions 査読

    T. Kasahara, J. Mizuno, S. Matsunami, T. Edura, M. Tsuwaki, J. Oshima, C. Adachi, S. Shoji

    2013 Transducers and Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013   2596 - 2599   2013年1月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We developed a variable multi-color microfluidic organic light emitting device based on mixing of different electrochemiluminescence (ECL) solutions. The prototype of microfluidic device consisted of Y-shaped SU-8 microchannels sandwiched between polyethylene naphthalate (PEN) and glass substrates having indium tin oxide (ITO) anode and cathode pairs. 5,6,11,12-tetraphenylnaphthacene (rubrene) and tetraphenyldibenzoperiflanthene (DBP) doped rubrene were used as ECL materials. Yellow, red, and orange color emissions from the ECL cell were obtained by changing DBP concentration in rubrene solution. Multi-color ECL was confirmed from the fabricated Y-shaped microfluidic device before and after mixing of ECL solutions. © 2013 IEEE.

    DOI: 10.1109/Transducers.2013.6627337

  • MULTI-COLOR MICROFLUIDIC ORGANIC LIGHT EMITTING DEVICE USING ELECTROLUMINESCENCE AND ELECTROCHEMILUMINESCENCE 査読

    T. Kasahara, J. Mizuno, S. Matsunami, T. Edura, M. Tsuwaki, J. Oshima, C. Adachi, S. Shoji

    26TH IEEE INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS 2013)   1133 - 1136   2013年1月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We developed a multi-color microfluidic organic light emitting device, which consists of liquid organic light emitting diodes (OLEDs) and electrochemiluminescence (ECL) devices. A 3 x 3 matrix of emitting pixels was fabricated in SU-8 microchannels sandwiched between polyethylene naphthalate (PEN) and glass substrates with indium tin oxide (ITO) anode and cathode pairs. Liquid organic semiconductor and ECL solutions as liquid emitters were injected into the microchannels. The electroluminescence (EL) and ECL were successfully obtained at the emitting pixels in the microchannels. The proposed structure can be applicable for multi-color liquid-based display.

    DOI: 10.1109/MEMSYS.2013.6474450

  • Light-Emitting Organic Crystal Field-Effect Transistors for Future Organic Injection Lasers 査読

    Hajime Nakanotani, Chihaya Adachi

    Physics of Organic Semiconductors: Second Edition   603 - 621   2013年1月

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    記述言語:英語  

    DOI: 10.1002/9783527655946.ch18

  • Highly efficient organic light-emitting diodes from delayed fluorescence 査読

    Hiroki Uoyama, Kenichi Goushi, Katsuyuki Shizu, Hiroko Nomura, Chihaya Adachi

    NATURE   492 ( 7428 )   234 - +   2012年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The inherent flexibility afforded by molecular design has accelerated the development of a wide variety of organic semiconductors over the past two decades. In particular, great advances have been made in the development of materials for organic light-emitting diodes (OLEDs), from early devices based on fluorescent molecules(1) to those using phosphorescent molecules(2,3). In OLEDs, electrically injected charge carriers recombine to form singlet and triplet excitons in a 1:3 ratio(1); the use of phosphorescent metal-organic complexes exploits the normally non-radiative triplet excitons and so enhances the overall electroluminescence efficiency(2,3). Here we report a class of metal-free organic electroluminescent molecules in which the energy gap between the singlet and triplet excited states is minimized by design(4), thereby promoting highly efficient spin up-conversion from non-radiative triplet states to radiative singlet states while maintaining high radiative decay rates, of more than 10(6) decays per second. In other words, these molecules harness both singlet and triplet excitons for light emission through fluorescence decay channels, leading to an intrinsic fluorescence efficiency in excess of 90 per cent and a very high external electroluminescence efficiency, of more than 19 per cent, which is comparable to that achieved in high-efficiency phosphorescence-based OLEDs(3).

    DOI: 10.1038/nature11687

  • Organic Single-Crystal Transistors Based on π-Extended Heteroheptacene Microribbons 査読

    Yu Seok Yang, Takuma Yasuda, Chihaya Adachi

    Bulletin of the Chemical Society of Japan   85 ( 11 )   1186 - 1191   2012年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Facile synthesis of a new series of pi-extended thienoacenes has been described. Their electronic structures have been elucidated by UV-vis absorption and photoelectron spectra. Well-defined single-crystal microribbons composed of self-organized thienoacene molecules have been fabricated using physical vapor transport, and have been applied to field-effect transistors. The organic transistors employing the single-crystal microribbons exhibit mobilities as high as 0.47 cm(2) V s(-1) with on/off ratios of ca. 10(6).

    DOI: 10.1246/bcsj.20120178

  • Efficient green thermally activated delayed fluorescence (TADF) from a phenoxazine-triphenyltriazine (PXZ-TRZ) derivative 査読 国際誌

    Hiroyuki Tanaka, Katsuyuki Shizu, Hiroshi Miyazaki, CHIHAYA ADACHI

    Chem. Comm.   48 ( 93 )   11392 - 11394   2012年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C2CC36237F

  • Formation of nanostructured donor/acceptor interfaces and their application to organic photovoltaic cells 査読

    Manabu Nakata, Kenji Kawano, Mao Yasumatsu, Masayuki Yahiro, Chihaya Adachi

    THIN SOLID FILMS   522   357 - 360   2012年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic nanostructures can enhance the device performance of organic photovoltaic (OPV) cells, because a significantly large area of a donor/acceptor heterointerface can be prepared. In this study, we improved the performance of OPV cells composed of cupper phthalocyanine (CuPc)/fullerene (C-60) by introducing a pentacene nanometer-sized grain layer into an anode/CuPc layer. The smallest featured grain sizes are as small as 100 nm, resulting in the formation of ragged heterojunctions. We show that power conversion efficiency is enhanced up to 20&#37; compared with that of conventional planar heterojunctions. (C) 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2012.08.008

  • Enhanced Electroluminescence Efficiency in a Spiro-Acridine Derivative through Thermally Activated Delayed Fluorescence 査読 国際誌

    Gabor Mehes, Hiroko Nomura, Tetsuya Nakagawa, CHIHAYA ADACHI

    Angewandte Chemie   51 ( 45 )   11311 - 11315   2012年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/anie.201206289

  • Reversible Coloration Enhanced by Electrochemical Deposition of an Ultrathin Zinc Layer onto an Anodic Nanoporous Alumina Layer 査読

    Shuzo Hirata, Toshiro Tsuji, Yoshimine Kato, Chihaya Adachi

    ADVANCED FUNCTIONAL MATERIALS   22 ( 20 )   4195 - 4201   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A productive method is introduced to realize large area color electronic paper (e-paper) with high UV resistance, heat resistance, and good significant bending properties using a color change triggered by reversible electronic change in the device structure. Reversible coloration and decoloration triggered by electrochemical deposition and desorption, respectively, of an ultra-thin zinc (Zn) layer on a thin transparent conductive layer coated on anodic nanoporous alumina has been developed. The deposition of the ultra-thin Zn layer triggers the formation of destructive interference, which leads to coloration. Yellow, magenta, and cyan colors were obtained in the colored state by increasing the NP-Al2O3 layer thickness, based on Bragg diffraction theory. Reflectance of more than 70&#37; and contrast values of more than 7 were obtained, which are nearly equivalent to those of previous e-papers. The color images in these devices also showed high UV resistance, heat resistance, and repeated significant bending endurance. The devices can be fabricated with large areas using low-cost manufacturing processes such as anodic oxidation, and use abundantly available materials. Our proposed device provides low-cost and flexible large area color e-paper for outdoor use.

    DOI: 10.1002/adfm.201200353

  • Organic Single-Crystal Transistors Based on pi-Extended Heteroheptacene Microribbons 査読 国際誌

    YANG YUSEOK, Takuma Yasuda, CHIHAYA ADACHI

    Bull. Chem. Soc. Jpn. 2012, 85, 1186-1191.   85   1186 - 1191   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/bcsj.20120178

  • Fluorinated Carbazole Derivatives as Wide-Energy-Gap Host Material for Blue Phosphorescent Organic Light-Emitting Diodes 査読 国際誌

    Yukitani Mizuno, Isao Takasu, Shuichi Uchikoga, Shuichi Enomoto, Tomoaki Sawabe, Akiko Amano, Atsushi Wada, Tomoko Sugizaki, Jiro Yoshida, Tomio Ono, CHIHAYA ADACHI

    JOURNAL OF PHYSICAL CHEMISTRY C   116 ( 39 )   20681 - 20687   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp303085h

  • Fluorinated Carbazole Derivatives as Wide-Energy-Gap Host Material for Blue Phosphorescent Organic Light-Emitting Diodes 査読

    Yukitami Mizuno, Isao Takasu, Shuichi Uchikoga, Shintaro Enomoto, Tomoaki Sawabe, Akio Amano, Atsushi Wada, Tomoko Sugizaki, Jiro Yoshida, Tomio Ono, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   116 ( 39 )   20681 - 20687   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    2,7-Difluo-carbazole and 2,4,5,7-tetrafluoro-carbazole were synthesized as new building blocks of wide-energy-gap host material for phosphorescent organic light-emitting diodes (PHOLEDs). These fluorinated positions in the carbazole ring were determined on the basis of density functional theory g calculation results. Spectroscopic analyses supported the hypothesis that poly(N-vinyl-2,7-difluoro-carbazole) (2,7-F-PVK) with the fluorinated pendant group possessed a wide energy gap, leading to the exciton energy confinement on the blue phosphorescent dopant as well as nonsubstituted poly(N-vinyl-carbazole) (PVK). 2,7-F-PVK was used in solution-processed blue PHOLED to achieve 27 cd/A at 760 cd/m(2), which is 1.8 times higher than that of nonsubstituted PVK We assumed that the replacement of nonsubstituted PVK with 2,7-F-PVK improved the charge balance in the emission layer, while keeping the exciton confinement effect. The fluorination of the carbazole ring is a useful molecular design strategy for wide-energy-gap host material.

    DOI: 10.1021/jp303085h

  • Liquid Carbazole Substituted with a Poly(ethylene oxide) Group and Its Application for Liquid Organic Light-emitting Diodes 査読

    Korefumi Kubota, Shuzo Hirata, Yuki Shibano, Osamu Hirata, Masayuki Yahiro, Chihaya Adachi

    CHEMISTRY LETTERS   41 ( 9 )   934 - 936   2012年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report efficient carrier injection characteristics in liquid organic light-emitting diodes (OLEDs). The use of a liquid carbazole substituted with a poly(ethylene oxide) (PEO) chain provided a substantial improvement in carrier injection compared to devices constructed with carbazoles without PEO units. The external electroluminescence quantum efficiency (Phi(EL).) of an OLED with the liquid carbazole as an emitting layer resulted in Phi(EL) = 0.75&#37;, 25 times higher Phi(EL) than that of our previous liquid OLED without electrolyte.

    DOI: 10.1246/cl.2012.934

  • Uniform and refreshable liquid electroluminescent device with a back side reservoir 査読

    Chang-Hoon Shim, Shuzo Hirata, Juro Oshima, Tomohiko Edura, Reiji Hattori, Chihaya Adachi

    APPLIED PHYSICS LETTERS   101 ( 11 )   2012年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We fabricated a refreshable organic light-emitting diode with a liquid emitting layer. This device has a mesh-structured cathode and a liquid reservoir in the back side of the cathode for easy convection of the liquid emitter. The small uniform gap between the electrodes was fabricated by means of micro-electro-mechanical systems (MEMS) processing. Although the device luminance decreased because of decomposition of the liquid emitters under the drive current, the decreased emission was quickly recovered to the initial state by convectional replacement of the decomposed emitters with fresh emitters through the holes of the mesh cathode. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4749791]

    DOI: 10.1063/1.4749791

  • Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes 査読

    Qisheng Zhang, Jie Li, Katsuyuki Shizu, Shuping Huang, Shuzo Hirata, Hiroshi Miyazaki, Chihaya Adachi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   134 ( 36 )   14706 - 14709   2012年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Efficient thermally activated delayed fluorescence (TADF) has been characterized for a carbazole/sulfone derivative in both solutions and doped films. A pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10&#37; at low current density. Because TADF only occurs in a bipolar system where donor and acceptor centered (3)pi pi* states are close to or higher than the triplet intramolecular charge transfer (3CT) state, control of the pi-conjugation length of both donor and acceptor is considered to be as important as breaking the pi-conjugation between them in blue TADF material design.

    DOI: 10.1021/ja306538w

  • Low Driving Voltage Characteristics of Triphenylene Derivatives as Electron Transport Materials in Organic Light-Emitting Diodes 査読 国際誌

    Kazunori Togashi, Shinataro Nomura, Norimasa Yokoyama, Takuma Yasuda, CHIHAYA ADACHI

    J. Mater. Chem. 2012, 22, 20689-20695.   22 ( 38 )   20689 - 20695   2012年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c2jm33669c

  • High-efficiency organic light-emitting diodes utilizing thermally activated delayed fluorescence from triazine-based donor-acceptor hybrid molecules 査読

    Sae Youn Lee, Takuma Yasuda, Hiroko Nomura, Chihaya Adachi

    APPLIED PHYSICS LETTERS   101 ( 9 )   2012年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We have designed and synthesized a high-efficiency purely organic luminescent material, 2,4-bis{3-(9H-carbazol-9-yl)-9H-carbazol-9-yl}-6-phenyl-1,3,5-triazine (CC2TA) comprising the bicarbazole donor and phenyltriazine acceptor units, which is capable of emitting thermally activated delayed fluorescence. The molecular design of CC2TA allows spatial separation of HOMO and LUMO on the donor and acceptor fragments, respectively, leading to an exceptionally small singlet-triplet exchange energy (Delta E-ST = 0.06 eV) together with a high triplet energy. Furthermore, a high external electroluminescence quantum efficiency as high as 11&#37; +/- 1&#37; has been achieved in the sky-blue organic light-emitting diodes employing CC2TA as an emitter. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4749285]

    DOI: 10.1063/1.4749285

  • Performance of an organic photodiode as an optical defector and its application to fluorometric flow-immunoassay for IgA 査読

    Mayo Miyake, Hizuru Nakajima, Akihide Hemmi, Masayuki Yahiro, Chihaya Adachi, Nobuaki Soh, Ryoichi Ishimatsu, Koji Nakano, Katsumi Uchiyama, Toshihiko Imato

    TALANTA   96   132 - 139   2012年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The performance of an organic thin film photodiode (OPD), fabricated from a hetero-junction comprised of two layers of C-60 and a phthalocyanine-Cu(II) complex was evaluated by detecting the chemiluminescence generated from the reaction of luminol with horseradish peroxidase in the presence of H2O2, and the fluorescence from resorufin, as an optical detector. The photocurrent of the OPD was linear with respect to the power of light from a commercial LED. The sensitivity of the OPD was sufficient for detecting chemiluminescence with a power 0.1 mu W/cm(2). The OPD was successfully used in a flow-immunoassay for IgA, a marker of human stress, in which a sandwich immunoassay was carried out on the microchip and the fluorescence from resorufin, produced by the enzymatic reaction, was detected. The detection limits for resorufin and IgA were 5.0 mu M and 16 ng/mL, respectively. The photosensitivity of the OPD remained relatively constant for a minimum of one year. (C) 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.talanta.2012.02.006

  • Efficient organic light-emitting diodes through up-conversion from triplet to singlet excited states of exciplexes 査読

    Kenichi Goushi, Chihaya Adachi

    APPLIED PHYSICS LETTERS   101 ( 2 )   2012年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Enhanced electroluminescence efficiency is achieved in organic light-emitting diodes through delayed fluorescence of the exciplex state formed between 4,40,4 ''-tris[3-methylphenyl(phenyl) amino]triphenylamine (m-MTDATA) as an electron-donating material and 2,8-bis(diphenylphosphoryl) dibenzo[b,d]thiophene (PPT) as an electron-accepting material. The devices exhibited maximum external electroluminescence quantum and power efficiencies of 10.0&#37; and 47.0 lm/W, respectively. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4737006]

    DOI: 10.1063/1.4737006

  • Highly luminescent π-conjugated dithienometalloles: photophysical properties and their application in organic light-emitting diodes 国際誌

    Ryosuke Kondo, Takuma Yasuda, YANG YUSEOK, Jun Yun Kim, CHIHAYA ADACHI

    J. Mater. Chem   33 ( 22 )   16810 - 16816   2012年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C2JM33526C

  • Very high open-circuit voltage of 5.89 V in organic solar cells with 10-fold-tandem structure 査読

    Ye Zou, Zhenbo Deng, William J. Potscavage, Masaya Hirade, Yanqiong Zheng, Chihaya Adachi

    APPLIED PHYSICS LETTERS   100 ( 24 )   2012年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic solar cells (OSCs) based on chloroaluminum phthalocyanine (ClAlPc) as donor and fullerene C-60 as acceptor with a multi-tandem structure were fabricated. We demonstrated very high open-circuit voltage (V-OC) and enhanced power conversion efficiency (PCE) for the multi-tandem OSCs. Using a fivefold structure, we obtained PCE of 2.49&#37; with a V-OC of 3.50 V, in comparison with PCE of similar to 2&#37; and V-OC of 0.72-0.81V for the single device. We also fabricated a tenfold-stacked OSC showing an extremely high V-OC of 5.89 V. The multi-tandem OSCs with very high V-OC have great potential for applications in limited-area low-power electronics. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729009]

    DOI: 10.1063/1.4729009

  • Triplet Exciton Confinement in Green Organic Light-Emitting Diodes Containing Luminescent Charge-Transfer Cu(I) Complexes 査読

    Qisheng Zhang, Takeshi Komino, Shuping Huang, Shigeyuki Matsunami, Kenichi Goushi, Chihaya Adachi

    ADVANCED FUNCTIONAL MATERIALS   22 ( 11 )   2327 - 2336   2012年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The temperature dependence of luminescence from [Cu(dnbp)(DPEPhos)]BF4 (dnbp = 2,9-di-n-butylphenanthroline, DPEPhos = bis[2-(diphenylphosphino)phenyl]ether) in a poly(methyl methacrylate) (PMMA) film indicates the presence of long-life green emission arising from two thermally equilibrated charge transfer (CT) excited states and one non-equilibrated triplet ligand center (3LC) excited state. At room temperature, the lower triplet CT state is found to be the predominantly populated excited state, and the zero-zero energy of this state is found to be 2.72 eV from the onset of its emission at 80 K. The tunable emission maximum of [Cu(dnbp)(DPEPhos)]BF4 in various hosts with different triplet energies is explained in terms of the multiple triplet energy levels of this complex in amorphous films. Using the high triplet energy charge transport material as a host and an exciton-blocking layer (EBL), a [Cu(dnbp)(DPEPhos)]BF4 based organic light-emitting diode (OLED) achieves a high external quantum efficiency (EQE) of 15.0&#37;, which is comparable to values for similar devices based on Ir(ppy)3 and FIrpic. The photoluminescence (PL) and electroluminescence (EL) performance of green emissive [Cu(mu I)dppb]2 (dppb = 1,2-bis[diphenylphosphino]benzene) in organic semiconductor films confirmed its 3CT state with a zero-zero energy of 2.76 eV as the predominant population excited state.

    DOI: 10.1002/adfm.201101907

  • Very high open-circuit voltage of 5.89 V in organic solar cells with 10-fold-tandem structure

    Zou Ye, Zhen Bo, William John Potscavage, Masaya Hirade, ZHENG YANQIONG, CHIHAYA ADACHI

    APPLIED PHYSICS LETTERS   100 ( 24 )   243302   2012年6月

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    記述言語:英語  

    DOI: 10.1063/1.4729009

  • Delayed Fluorescence by Reverse Intersystem Crossing and Application to Organic Light-Emitting Diodes 査読

    Kenichi Goushi, Chihaya Adachi

    2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)   2012年5月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    Organic donor and acceptor interfaces give rise to a small energy gap between the singlet and triplet exciton levels (Delta E-ST) of generated exciplexes. We demonstrate that the small. Delta E-ST can lead to efficient electroluminescence.

  • Real-Time Measurement of Molecular Orientational Randomization Dynamics during Annealing Treatments by In-Situ Ellipsometry 査読

    Takeshi Komino, Hiroko Nomura, Masayuki Yahiro, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   116 ( 21 )   11584 - 11588   2012年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The molecular orientational randomization dynamics of organic thin films during annealing were measured by real-time in situ ellipsometry. The spirofluorene derivatives used in this work formed amorphous thin films with the molecules oriented parallel to the substrates when the films were vacuum deposited at room temperature. However, the molecular orientations became random when the thin films were annealed at temperatures higher than the glass transition temperature because molecular migration occurred. Analysis of the ellipsometry results using a graded model showed that the randomization of the molecular orientations depended on the thickness of the thin film. This suggests that the surface glass transition temperatures are lower than the bulk glass transition temperatures in the thin films of these small molecules.

    DOI: 10.1021/Jp302158k

  • Proceedings of SPIE - The International Society for Optical Engineering: Introduction 査読

    Barry P. Rand, Chihaya Adachi, Volker Van Elsbergen

    Proceedings of SPIE - The International Society for Optical Engineering   8435   2012年4月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    This PDF file contains the front matter associated with SPIE Proceedings Volume 8435, including the Title Page, Copyright information, Table of Contents, Introduction, and the Conference Committee listing. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

    DOI: 10.1117/12.978944

  • Identification of device degradation positions in multi-layered phosphorescent organic light emitting devices using water probes 査読

    Hitoshi Yamamoto, Chihaya Adachi, Michael S. Weaver, Julie J. Brown

    APPLIED PHYSICS LETTERS   100 ( 18 )   2012年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We exposed regions of green phosphorescent organic light emitting devices (PHOLED(TM)s) consisting of a fac-tris(2-phenylpyridine)iridium (Ir(ppy)(3)) as the phosphorescent emitter to a partial pressure of water of 3 x 10(-4) Pa during device fabrication to induce degradation in a specific region of the multi-layered devices. We identified the interface between the hole transport layer and the emissive layer as the most susceptive region to degradation. We discuss the luminance loss mechanism and estimate an operational lifetime of 10 000 h, after 20&#37; loss of the initial luminance from 1000 cd/m(2), is attainable from an Ir(ppy)(3) PHOLED fabricated under ultra-high vacuum conditions. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4711129]

    DOI: 10.1063/1.4711129

  • Improved Device Lifetime of Organic Light Emitting Diodes with an Electrochemically Stable pi-Conjugated Liquid Host in the Liquid Emitting Layer 査読

    Shuzo Hirata, Hyo Jung Heo, Yuki Shibano, Osamu Hirata, Masayuki Yahiro, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS   51 ( 4 )   2012年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The device lifetimes of organic light emitting diodes with a liquid emitting layer (liquid OLEDs) were improved by proper combination of host and guest molecules in the liquid emitting layer. The device lifetime strongly depends on the electrochemical stability of radical cations in the liquid emitting layer. The electrochemical stability of the liquid host materials was achieved by the dimerization of the alkyl-substituted carbazole 9,9'-{2[2-(2-methoxyethoxy)ethoxy]ethyl}-3,3'-bis(9H-carbazole) [(TEGCz)(2)]. The use of a guest compound with its highest occupied molecular orbital level higher in energy than that of (TEGCz)(2) is a critical factor for realizing stable electroluminescence performance. A liquid OLED with proper combination of the guest and host materials showed an improved device lifetime of longer than 1 h, which is 100 times longer than that of our previous reports. (C) 2012 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.51.041604

  • Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversion 査読

    Kenichi Goushi, Kou Yoshida, Keigo Sato, Chihaya Adachi

    NATURE PHOTONICS   6 ( 4 )   253 - 258   2012年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Light emission from organic light-emitting diodes that make use of fluorescent materials have an internal quantum efficiency that is typically limited to no more than 25&#37; due to the creation of non-radiative triplet excited states. Here, we report the use of electron-donating and electron-accepting molecules that allow a very high reverse intersystem crossing of 86.5&#37; between non-radiative triplet and radiative singlet excited states and thus a means of achieving enhanced electroluminescence. Organic light-emitting diodes made using m-MTDATA as the donor material and 3TPYMB as the acceptor material demonstrate that external quantum efficiencies as high as 5.4&#37; can be achieved, and we believe that the approach will offer even higher values in the future as a result of careful material selection.

    DOI: 10.1038/nphoton.2012.31

  • Horizontal Orientation of Disk-like Hole Transport Molecules and Their Application for Organic Light-Emitting Diodes Requiring a Lower Driving Voltage 査読

    Jun Y. Kim, Daisuke Yokoyama, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   116 ( 15 )   8699 - 8706   2012年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Novel starburst type amorphous materials N-1,N-1,N-4,N-1-tetra(biphenyl-4-yl)benzene-1,4-diamine, N-1,N-1,N-1,N-1-tetrakis (4-(thio-phen-2-yl)phenyl)benzene-1,4-diamine, and N-1,N-1,N-1,N-1-tetrakis(4-(benzo[b]thiophen-2-yl)phenyl)benzene-1,4-diamine are synthesized and applied as hole injection layers (HILs) in organic light-emitting diodes (OLEDs). OLEDs containing these materials as a HIL demonstrated a significant reduction in the required driving voltage. We found that these molecules form a horizontally oriented amorphous thin film upon vacuum deposition. We observed a close correlation between the reduction of driving voltage in OLEDs and the orientation parameter of the organic thin films. We identified that the enhanced horizontal molecular orientation results in the lower driving voltage because of a decrease in the hole injection barrier at the anode/HIL interface.

    DOI: 10.1021/jp301650x

  • Electroluminescence Based on Thermally Activated Delayed Fluorescence Generated by a Spirobifluorene Donor-Acceptor Structure 査読 国際誌

    Tetsuya Nakagawa, Sung-Yu Ku, Ken-Tsung Wong, CHIHAYA ADACHI

    Chem. Comm.   48   9580   2012年4月

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    記述言語:英語  

    DOI: 10.1039/C2CC31468A

  • [2,2']Bi[naphtho[2,3-b]furanyl]: a versatile organic semiconductor with a furan-furan junction 査読 国際誌

    N. Niimi, H. Mori, E. Miyazaki, I. Osaka, K. takimiya, CHIHAYA ADACHI

    Chem. Comm.   48   5892 - 5894   2012年4月

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    記述言語:英語  

    DOI: 10.1039/C2CC31960H

  • Identification of device degradation positions in multi-layered phosphorescent organic light emitting devices using water probes

    Hitoshi Yamamoto, CHIHAYA ADACHI, Michael S. Weaver, Julie J. Brown

    APPLIED PHYSICS LETTERS   100 ( 18 )   2012年4月

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    記述言語:英語  

    DOI: 10.1063/1.4711129

  • Efficient Luminescence from a Copper(I) Complex Doped in Organic Light-Emitting Diodes by Suppressing C-H Vibrational Quenching 査読 国際誌

    Atsushi Wada, QISHENG ZHANG, Takuma Yasuda, Takasu Isao, Shintaro Enomoto, CHIHAYA ADACHI

    Chem. Comm.   48   5340 - 5342   2012年3月

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    記述言語:英語  

    DOI: 10.1039/C2CC31509B

  • Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversion 査読 国際誌

    Kenichi Goushi, Kou Yoshida, Keigo Sato, Chihaya Adachi

    Nature Photonics   2012年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    エキサイプレックスと呼ばれる種類の異なる2つの分子の会合体を有機エレクトロルミネッセンス素子(有機EL素子)の発行材料に適応し、電流励起によるエキサイプレックス発光の中では、最も高い外部量子効率が5%を超える世界トップレベルの高効率化の実現に成功した。本成果は低消費電力で環境負荷が少ない有機ELテレビや有機EL照明などの次世代エレクトロニクス分野において、新たな発光分子の設計指針やデバイスの構築への大きな貢献が期待できる。

  • MICROFLUIDIC ORGANIC LIGHT EMITTING DIODE (OLED) USING LIQUID ORGANIC SEMICONDUCTORS 査読

    T. Kasahara, J. Mizuno, S. Hirata, T. Edura, S. Matsunami, C. Adachi, S. Shoji

    2012 IEEE 25TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS)   2012年1月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We propose a first prototype of the microfluidic organic light emitting diode (OLED). A matrix of 3x3 OLED array was fabricated in the SU-8 microchannels sandwiched by the indium tin oxide (ITO) anode and cathode. The liquid organic semiconductors were employed for the light emitters and were injected into the microchannels. The electroluminescence was obtained in the microchannels under the optimized applied voltage. The current density of 2.11 mA/cm(2) was measured at 60 V. Since flesh liquid organic semiconductors are continuously supplied to the emitting layer, long-term stable electroluminescence is expected by the proposed OLED.

    DOI: 10.1109/MEMSYS.2012.6170256

  • A dicarbazole-triazine hybrid bipolar host material for highly efficient green phosphorescent OLEDs 査読 国際誌

    Chih-Hao Chang, Ming-Cheng Kuo, Wei-Chieh Lin, Yu-Ting Chen, Ken-Tsung Wong, Shu-Hua Chou, Ejabul Mondal, Raymond C. Kwong, Sean Xia, Tetsuya Nakagawa and Chihaya Adachi

    Journal of Materials Chemistry   22   2012年1月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/C2JM14686J

  • Synthesis and characterization of CdSe nanocrystals capped with TOPO and pyridine 査読

    Xiang Dong Luo, Umme Farva, Nguyen Tam Nguyen Truong, Kyung Soo Son, Pei Sheng Liu, Chihaya Adachi, Chinho Park

    JOURNAL OF CRYSTAL GROWTH   339 ( 1 )   22 - 30   2012年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    TOPO-capped CdSe nanocrystals with different sizes were synthesized by a slightly modified Peng and Peng's method, and pyridine-capped CdSe nanocrystals were obtained from TOPO-capped CdSe by exchange of TOPO with pyridine. By applying X-ray powder diffraction. X-ray photoelectron spectroscopy (XPS), transmission electron microscopy, photoluminescence (PL) and time-resolved PL (TRPL) spectroscopy, structural and optical characteristics of TOPO-capped and pyridine-capped CdSe are studied in detail. Analysis results show that, by exchanging the surface ligand from TOPO to pyridine, the crystalline quality and optical properties of CdSe nanocrystals are improved. During surface ligand exchange, the diameter of CdSe is decreased, which is caused by the loss of surface Cd and Se atoms with leaving TOPO molecules. The TRPL results suggest that the localized optical transitions of pyridine-capped CdSe, which result from defects and impurities existing in the nanocrystals, are suppressed, compared with those from the original TOPO-capped CdSe. The PL blue-shifts of pyridine-capped CdSe are also observed, and the PL and XPS results indicate that, when TOPO is substituted by pyridine, the surface electronic density of CdSe is re-distributed. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jcrysgro.2011.11.048

  • Novel Concept Organic Semiconductors Useful for Organic Light Emitting Diodes 査読

    Chihaya Adachi

    IDW'11: PROCEEDINGS OF THE 18TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3   791 - 794   2011年12月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We report a material having a very small energy gap between its singlet and triplet excited states, Delta E1-3, that realizes efficient up-conversion of triplet excitons into a singlet state, leading to efficient thermally activated delayed fluorescence (TADF). Our molecule, 2-biphenyl-4,6-bis(12-phenylindolo[2,3-a]carbazol-11-yl)-1,3,5-tria zine (PIC-TRZ), broke the large energy gap restriction, providing a quite small Delta E1-3 of 0.11 eV while maintaining a high fluorescent radiative decay rate (k(r)similar to 10(7)). The intense TADF provides a novel pathway for high efficiency electroluminescence.

  • An integrated enzyme-linked immunosorbent assay system with an organic light-emitting diode and a charge-coupled device for fluorescence detection 査読

    Hizuru Nakajima, Yukiko Okuma, Kazuhiro Morioka, Mayo Miyake, Akihide Hemmi, Tatsuya Tobita, Masayuki Yahiro, Daisuke Yokoyama, Chihaya Adachi, Nobuaki Soh, Koji Nakano, Shuhua Xue, Hulie Zeng, Katsumi Uchiyama, Toshihiko Imato

    JOURNAL OF SEPARATION SCIENCE   34 ( 20 )   2906 - 2912   2011年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A fluorescence detection system for a microfluidic device using an organic light-emitting diode (OLED) as the excitation light source and a charge-coupled device (CCD) as the photo detector was developed. The OLED was fabricated on a glass plate by photolithography and a vacuum deposition technique. The OLED produced a green luminescence with a peak emission at 512 nm and a half bandwidth of 55 nm. The maximum external quantum efficiency of the OLED was 7.2&#37;. The emission intensity of the OLED at 10 mA/cm(2) was 13 mu W (1.7 mW/cm(2)). The fluorescence detection system consisted of the OLED device, two band-pass filters, a five microchannel poly(dimethylsiloxane) (PDMS) microfluidic device and a linear CCD. The fluorescence detection system was successfully used in a flow-based enzyme-linked immunosorbent assay on a PDMS microfluidic device for the rapid determination of immunoglobulin A (IgA), a marker for human stress. The detection limit (S/N = 3) for IgA was 16.5 ng/mL, and the sensitivity was sufficient for evaluating stress. Compared with the conventional 96-well microtiter plate assay, the analysis time and the amounts of reagent and sample solutions could all be reduced.

    DOI: 10.1002/jssc.201100429

  • Small molecular organic photovoltaic cells with exciton blocking layer at anode interface for improved device performance 査読

    Masaya Hirade, Chihaya Adachi

    APPLIED PHYSICS LETTERS   99 ( 15 )   153302   2011年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate enhanced power conversion efficiency (eta(PCE)) for small molecular-based organic photovoltaic cells with an exciton blocking layer (ExBL) at the anode/donor interface. Although poly(3,4-ethylenedioxythiophene):poly(4-styrene sulfonate) (PEDOT:PSS) films are widely used as anodic buffer layers, they also act as exciton quenchers. To prevent exciton quenching, we introduced a tris[4-(5-phenyl thiophen-2-yl)phenyl]amine layer between the donor and the PEDOT:PSS layer and clarified its effect. By a combination of dual ExBLs at both the anode and cathode sides, we achieved significantly enhanced short circuit current and eta(PCE) values; the highest eta(PCE) = 5.24&#37; was obtained by optimizing the device parameters. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3650472]

    DOI: 10.1063/1.3650472

  • Dependence of the Amplified Spontaneous Emission Threshold in Spirofluorene Thin Films on Molecular Orientation 査読

    Takeshi Komino, Hiroko Nomura, Masayuki Yahiro, Kuniaki Endo, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   115 ( 40 )   19890 - 19896   2011年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The dependence of the amplified spontaneous emission threshold (E-th) on molecular orientation in vacuum deposited thin films fabricated from diphenyldiamine- and carbazole-substituted spirofluorene derivatives was investigated. The molecular orientations were modified by changing the substrate temperature during deposition and were almost parallel to the substrate at around 300 K in all of the films. The orientation became random in the film containing diphenyldiamine compound at around 380 K, resulting in decreased optical anisotropy. However, for the carbazole compound, the molecular orientation scarcely changed from 300 to 380 K, while the root-mean-square roughness increased from 0.28 to 0.94 nm. E-th approximately doubled for both the films when the optical anisotropy decreased because of the randomization of molecular orientation or when the surface roughness increased.

    DOI: 10.1021/jp2007717

  • High Carrier Mobility of 3.8 cm(2) V-1 s(-1) in Polydiacetylene Thin Films Polymerized by Electron Beam Irradiation 査読

    Takuji Kato, Mao Yasumatsu, Chikako Origuchi, Kyoji Tsutsui, Yasukiyo Ueda, Chihaya Adachi

    APPLIED PHYSICS EXPRESS   4 ( 9 )   2011年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The highest carrier mobility of polydiacetylene (PDA) thin films in field-effect transistors has been limited to less than 0.8cm(2) V-1 s(-1), although the main chain conduction should show higher carrier mobility potentially. We revealed that the cause of the low carrier mobility is due to the presence of local upheaval regions generated by the volume change through the polymerization process of diacetylene monomers. In order to suppress the occurrence of the upheaval regions, we found that electron beam (EB) irradiation is effective, resulted in the highest carrier mobility of mu(max) = 3.8 cm(2) V-1 s(-1). (C) 2011 The Japan Society of Applied Physics

    DOI: 10.1143/APEX.4.091601

  • High Carrier Mobility of 3.8 cm(2) V-1 s(-1) in Polydiacetylene Thin Films Polymerized by Electron Beam Irradiation 査読

    Takuji Kato, Mao Yasumatsu, Chikako Origuchi, Kyoji Tsutsui, Yasukiyo Ueda, Chihaya Adachi

    APPLIED PHYSICS EXPRESS   4 ( 9 )   91601   2011年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The highest carrier mobility of polydiacetylene (PDA) thin films in field-effect transistors has been limited to less than 0.8cm(2) V-1 s(-1), although the main chain conduction should show higher carrier mobility potentially. We revealed that the cause of the low carrier mobility is due to the presence of local upheaval regions generated by the volume change through the polymerization process of diacetylene monomers. In order to suppress the occurrence of the upheaval regions, we found that electron beam (EB) irradiation is effective, resulted in the highest carrier mobility of mu(max) = 3.8 cm(2) V-1 s(-1). (C) 2011 The Japan Society of Applied Physics

    DOI: 10.1143/APEX.4.091601

  • Two-dimensional orientation control of organic semiconducting amorphous films by mechanical brushing 査読

    Toshiharu Arai, Kenichi Goushi, Hiroko Nomura, Tomohiko Edura, Chihaya Adachi

    APPLIED PHYSICS LETTERS   99 ( 5 )   2011年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate that horizontally oriented organic semiconducting molecules in amorphous films can be oriented uniaxially by mechanical brushing. The absorption of polarized light in the direction parallel to the brushing direction was higher than the absorption in the perpendicular direction. Thus, simultaneous uniaxial and in-plane molecular orientation in amorphous films was realized by brushing. In addition, we demonstrate a polarized electroluminescence from the films treated by mechanical brushing. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3608315]

    DOI: 10.1063/1.3608315

  • Thermoelectric properties of n-type C-60 thin films and their application in organic thermovoltaic devices 査読

    Mao Sumino, Kentaro Harada, Masaaki Ikeda, Saburo Tanaka, Koji Miyazaki, Chihaya Adachi

    APPLIED PHYSICS LETTERS   99 ( 9 )   2011年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The high performance of n-type organic thin-film thermoelectric elements utilizing a bilayer structure composed of C-60 and Cs2CO3 was demonstrated. By employing an underlying layer, the electrical conductivity and the power factor of the n-type thermoelectric elements were significantly improved, and a maximum power factor of 20.5 mu W m(-1) K-2 at room temperature was demonstrated. In addition, an organic p-n prototype thermovoltaic device was demonstrated. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3631633]

    DOI: 10.1063/1.3631633

  • Phenanthrene-functionalized 3,6-dithiophen-2-yl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-diones as donor molecules for solution-processed organic photovoltaic cells 査読

    Zhonglian Wu, Aiyuan Li, Benhu Fan, Feng Xue, Chihaya Adachi, Jianyong Ouyang

    SOLAR ENERGY MATERIALS AND SOLAR CELLS   95 ( 8 )   2516 - 2523   2011年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    3,6-Dithiophen-2-yl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP) based organic molecules and polymers have received strong attention as the donor materials of efficient organic photovoltaic cells (OPVs). This paper reports the synthesis and characterization of two DPP-based organic molecules functionalized with phenanthrene and ethynylphenanthrene and their application as the donor materials of solution-processed OPVs. They have band gaps of 1.6-1.8 eV and appropriate energy levels, and they can be soluble in common organic solvents such as chloroform and tetrahydrofuran. The C C triple bond in ethynylphenanthrene has a strong effect on the structure and properties of molecules. It increases the rigidity of molecule, decreases the solubility in organic solvents, and increases the crystallinity of the active layer and photovoltaic performance of the OPVs. The optimal photovoltaic efficiency of OPVs with ethynylphenanthrene-functionalized DPP is 1.71&#37; under AM 1.5 G illumination (100 mW cm(-2)), more than double of that of the OPVs with phenanthrene-functionalized DPP. (C) 2011 Elsevier By. All rights reserved.

    DOI: 10.1016/j.solmat.2011.05.006

  • Photophysical characteristics of 4,4’-bis(N-carbazolyl)tolan derivatives and their application in organic light emitting diodes 査読

    Ohkita Masakazu, Endo Ayataka, Sumiya Kimihiro, Nakanotani Hajime, Suzuki Takanori, Adachi Chihaya

    Journal of Luminescence   131 ( 7 )   1520 - 1524   2011年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Photophysical characteristics of 4,4 '-bis(N-carbazolyl)tolan derivatives and their application in organic light emitting diodes
    4,4'-bis(N-carbazolyl)tolan (BCT) and 4,4'-bis[N-(3,6-di-t-butyl)carbazolyl]tolan (BCT-t-Bu) were synthesized as pi-expanded analogs of 4,4'-bis(N-carbazolyl)biphenyl. Their photophysical characteristics both in solution and films were thoroughly investigated. Interestingly, the phosphorescence spectrum of BCT was significantly medium-dependent, and the emission maximum was red-shifted by 131 nm from 489 nm in solution at 77 K to 620 nm in a deposited film at 5 K. suggesting the presence of strong intermolecular interactions in the film. BCT and BCT-t-Bu were found to be useful as host materials for fluorescence-based organic light emitting diodes (OLEDs). However, their low triplet energy levels in films negated their potential to act as hosts in phosphorescence-based OLEDs. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jlumin.2011.01.028

  • Horizontal Orientation of a Linear-Shaped Platinum(II) Complex in Organic Light-Emitting Diodes with a High Light Out-Coupling Efficiency 査読

    Masatsugu Taneda, Takuma Yasuda, Chihaya Adachi

    APPLIED PHYSICS EXPRESS   4 ( 7 )   2011年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A linear-shaped phosphorescent platinum(II) complex that adopts a horizontal orientation in amorphous films was synthesized. The complex possesses a photoluminescence quantum efficiency of Phi(PL) = 50 +/- 3&#37; in thin films with the host of m-biscarbazolylbenzene and 4,4'-bis(N-carbazolyl)biPhenyl. Polarized emission from the edge of these thin films confirmed the horizontal orientation of the complex within them. An organic light-emitting diode containing the complex possessed a maximum external quantum efficiency of eta(EQE) = 15.8 +/- 3&#37;. The light out-coupling efficiency of the device was estimated to be at least 4 = 32 +/- 3&#37;, which was ascribed to the horizontal orientation of the complex. (C) 2011 The Japan Society of Applied Physics

    DOI: 10.1143/APEX.4.071602

  • Photophysical characteristics of 4,4’-bis(N-carbazolyl)tolan derivatives and their application in organic light emitting diodes 国際誌

    Masakazu Ohkita, Ayataka Endo, Kimihiro Sumiya, Hajime Nakanotani, Takanori Suzuki, and Chihaya Adachi

    Journal of Luminescence   131 ( 7 )   2011年7月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jlumin.2011.01.028

  • p-i-n Homojunction in Organic Light-Emitting Transistors 査読

    Satria Zulkarnaen Bisri, Taishi Takenobu, Kosuke Sawabe, Satoshi Tsuda, Yohei Yomogidao, Takeshi Yamao, Shu Hotta, Chihaya Adachi, Yoshihiro Iwasa

    ADVANCED MATERIALS   23 ( 24 )   2753 - 2758   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A new method for investigating light-emitting property in organic devices is demonstrated. We apply the ambipolar light-emitting transistors (LETS) to directly observe the recombination zone, and find a strong link between the transistor performance and the zone size. This finding unambiguously indicates that the light emission comes from the electric-field-induced p-i-n homojunction in ambipolar LETs.

    DOI: 10.1002/adma.201004572

  • Horizontal Orientation of a Linear-Shaped Platinum(II) Complex in Organic Light-Emitting Diodes with a High Light Out-Coupling Efficiency 査読 国際誌

    Masatsugu Taneda, Takuma Yasuda, and Chihaya Adachi

    Applied Physics Express   4   2011年6月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1143/APEX.4.071602

  • Organic Electrodes Consisting of Dianthratetrathiafulvalene and Fullerene and Their Application in Organic Field Effect Transistors 査読

    Takuji Kato, Chikako Origuchi, Masato Shinoda, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS   50 ( 5 )   50202   2011年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A double layer of dianthratetrathiafulvalene (DATTF) and fullerene (C-60) on an n(++)-Si wafer pretreated with n-octyltrichlorosilane exhibited a high electrical conductivity of sigma = 0.12 S/cm and was used as source-drain electrodes in organic field effect transistors (OFETs). A simplified OFET device architecture composed of an organic semiconducting active layer and an organic electrode layer was easily fabricated by successive vacuum deposition of organic donor and acceptor layers. It was confirmed that this device configuration is applicable for both p-and n-type FET operation. (C) 2011 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.50.050202

  • Light extractionfrom surface plasmons and waveguide modes with nanoimprinted gratings in organic light-emitting diodes 査読 国際誌

    Joerg Frischeisen, Quan Niu, Robert Gehlhaar, Giuseppe Scarpa, Chihaya Adachi, Paolo Lugli, and Wolfgang Brutting

    Optical Express   19 ( S1 )   2011年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1364/OE.19.0000A7

  • Increased light outcoupling efficiency in dye-doped small molecule organic light-emitting diodes with horizontally oriented emitters 査読

    Joerg Frischeisen, Daisuke Yokoyama, Ayataka Endo, Chihaya Adachi, Wolfgang Bruetting

    ORGANIC ELECTRONICS   12 ( 5 )   809 - 817   2011年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Small molecule organic light-emitting diodes (SM-OLEDs) are efficient large area light sources facing their market entry. However, a low light outcoupling efficiency of typically 20&#37; still strongly limits device performance. Here, we highlight the potential of employing dye-doped emission layers with emitting molecules having horizontally oriented transition dipole moments. The effect of molecular orientation is explained by studying optical simulations that distinguish between horizontal and vertical dipole orientation. In addition, an experimental method that enables straightforward determination of dipole orientation in guest-host systems is presented and used for the analysis of two materials that are very similar except for their orientation. By measuring the external electroluminescence quantum efficiency of SM-OLEDs based on these materials, evidence is found that a mainly horizontal dipole orientation enhances light outcoupling by around 45&#37;. Furthermore, the effect of orientation in SM-OLEDs offers many additional benefits concerning stack design and has fundamental implications for material choice. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2011.02.005

  • Highly photostable distributed-feedback polymer waveguide blue laser using spirobifluorene derivatives 査読

    Hirotaka So, Hirofumi Watanabe, Masayuki Yahiro, Yu Yang, Yuji Oki, Chihaya Adachi

    OPTICAL MATERIALS   33 ( 6 )   755 - 758   2011年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this study, we synthesized the new spirobifluorene derivatives; hexylbiphenyl-spirobifluorene (HBP-Spiro) and triphenylamine-spirobifluorene (TPA-Spiro) and demonstrated the operation of a distributed-feedback polymer waveguide blue laser. In addition, we investigated the optical and lasing properties of spirobifluorene derivatives including photostability. The experimental slope efficiency and the energy threshold of a HBP-Spiro-doped waveguide laser were 3.6&#37; and 1.9 mu J, respectively. An operation lifetime of 27,000 shots was obtained for a pump-pulse duration of 1.2 ns and energy of 3.0 mu J at a wavelength of 355 nm. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.optmat.2010.12.011

  • highly photostable distributed-feedback polymer waveguide blue laser using spirobifluorene derivatives

    Hirotake So, Hirofumi Watanabe, Masayuki Yahiro, Yu Yang, Yuji Oki and Chihaya Adachi

    Opt. Mat.   33 ( 6 )   2011年4月

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    記述言語:英語  

  • Molecular Stacking Induced by Intermolecular C-H center dot center dot center dot N Hydrogen Bonds Leading to High Carrier Mobility in Vacuum-Deposited Organic Films 査読

    Daisuke Yokoyama, Hisahiro Sasabe, Yukio Furukawa, Chihaya Adachi, Junji Kido

    ADVANCED FUNCTIONAL MATERIALS   21 ( 8 )   1375 - 1382   2011年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Simple bottom-up fabrication processes for molecular self-assembly have been developed for the construction of higher-order structures using organic materials, and have contributed to maximization of the potential of organic materials in chemical and bioengineering. However, their application to organic thin-film devices such as organic light-emitting diodes have not been widely considered because simple fabrication of a solid film containing an internal self-assembly structure has been regarded as difficult. Here it is shown that the intermolecular C-H center dot center dot center dot N hydrogen bonds can be simply formed even in vacuum-deposited organic films having flat interfaces. By designing the molecules containing pyridine rings properly for the intermolecular interaction, one can control the molecular stacking induced by the intermolecular hydrogen bonds. It is also demonstrated that the molecular stacking contributes to the high carrier mobility of the film. These findings provide new guidelines to improve the performance of organic optoelectronic devices and open up the possibilities for further development of organic devices with higher-order structures.

    DOI: 10.1002/adfm.201001919

  • Improvement of Electroluminescence Performance of Organic Light-Emitting Diodes with a Liquid-Emitting Layer by Introduction of Electrolyte and a Hole-Blocking Layer 査読

    Shuzo Hirata, Korefumi Kubota, Heo Hyo Jung, Osamu Hirata, Kenichi Goushi, Masayuki Yahiro, Chihaya Adachi

    ADVANCED MATERIALS   23 ( 7 )   889 - +   2011年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic light-emitting diodes containing a liquid-emitting layer that exhibit improved external electroluminescence quantum efficiency (Phi(EL)) and maximum luminance are presented. Doping the liquid-emitting layer with an electrolyte significantly decreases the turn-on voltage for electroluminescence. Insertion of a TiO(2) hole-blocking layer between the liquid-emitting layer and indium tin oxide cathode improves Phi(EL).

    DOI: 10.1002/adma.201003505

  • Efficient up-conversion of triplet excitons into a singlet state and its application for organic light emitting diodes 査読

    Ayataka Endo, Keigo Sato, Kazuaki Yoshimura, Takahiro Kai, Atsushi Kawada, Hiroshi Miyazaki, Chihaya Adachi

    APPLIED PHYSICS LETTERS   98 ( 8 )   2011年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A material possessing a very small energy gap between its singlet and triplet excited states, Delta E1-3, which allows efficient up-conversion of triplet excitons into a singlet state and leads to efficient thermally activated delayed fluorescence (TADF), is reported. The compound, 2-biphenyl-4,6-bis(12-phenylindolo[2,3-a] carbazole-11-yl)-1,3,5-triazine, breaks the restriction of a large energy gap, with a Delta E1-3 of just 0.11 eV, while maintaining a high fluorescent radiative decay rate (k(r) similar to 10(7)). The intense TADF provides a pathway for highly efficient electroluminescence. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3558906]

    DOI: 10.1063/1.3558906

  • Light extraction from surface plasmons and waveguide modes in an organic light-emitting layer by nanoimprinted gratings 査読

    Joerg Frischeisen, Quan Niu, Alaa Abdellah, Joerg B. Kinzel, Robert Gehlhaar, Giuseppe Scarpa, Chihaya Adachi, Paolo Lugli, Wolfgang Bruetting

    OPTICS EXPRESS   19 ( 1 )   A7 - A19   2011年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic light-emitting diodes (OLEDs) usually exhibit a low light outcoupling efficiency because a large fraction of power is lost to surface plasmons (SPs) and waveguide modes. In this paper it is demonstrated that periodic grating structures with almost mu m-scale can be used to extract SPs as well as waveguide modes and therefore enhance the outcoupling efficiency in light-emitting thin film structures. The gratings are fabricated by nanoimprint lithography using a commercially available diffraction grating as a mold which is pressed into a polymer resist. The outcoupling of SPs and waveguide modes is detected in fluorescent organic films adjacent to a thin metal layer in angular dependent photoluminescence measurements. Scattering up to 5th-order is observed and the extracted modes are identified by comparison to the SP and waveguide dispersion obtained from optical simulations. In order to demonstrate the low-cost, high quality and large area applicability of grating structures in optoelectronic devices, we also present SP extraction using a grating structure fabricated by a common DVD stamp. (C)2010 Optical Society of America

  • Light extraction from surface plasmons and waveguide modes in an organic light-emitting layer by nanoimprinted gratings 査読

    Joerg Frischeisen, Quan Niu, Alaa Abdellah, Joerg B. Kinzel, Robert Gehlhaar, Giuseppe Scarpa, Chihaya Adachi, Paolo Lugli, Wolfgang Bruetting

    OPTICS EXPRESS   19 ( 1 )   A7 - A19   2011年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic light-emitting diodes (OLEDs) usually exhibit a low light outcoupling efficiency because a large fraction of power is lost to surface plasmons (SPs) and waveguide modes. In this paper it is demonstrated that periodic grating structures with almost mu m-scale can be used to extract SPs as well as waveguide modes and therefore enhance the outcoupling efficiency in light-emitting thin film structures. The gratings are fabricated by nanoimprint lithography using a commercially available diffraction grating as a mold which is pressed into a polymer resist. The outcoupling of SPs and waveguide modes is detected in fluorescent organic films adjacent to a thin metal layer in angular dependent photoluminescence measurements. Scattering up to 5th-order is observed and the extracted modes are identified by comparison to the SP and waveguide dispersion obtained from optical simulations. In order to demonstrate the low-cost, high quality and large area applicability of grating structures in optoelectronic devices, we also present SP extraction using a grating structure fabricated by a common DVD stamp. (C)2010 Optical Society of America

    DOI: 10.1364/OE.19.0000A7

  • Formation of Organic Crystalline Nanopillar Arrays and Their Application to Organic Photovoltaic Cells 査読

    Masaya Hirade, Hajime Nakanotani, Masayuki Yahiro, Chihaya Adachi

    ACS APPLIED MATERIALS & INTERFACES   3 ( 1 )   80 - 83   2011年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To enhance the performance of organic photovoltaic (OPV) preparation of organic nanometer-sized pillar arrays is fascinating because a significantly large area of a donor/acceptor heterointerface having continuous conduction to both anode and cathode electrodes can be realized. In this study, we grew cupper phthalocyanine (CuPc) crystalline nanopillar arrays by conventional thermal gradient sublimation technique using a few-nanometer-sized trigger seeds composed of a CuPc and 3,4,9,10-perylene-thermal carboxylic-dianhydride (PTCDA) stacked layer. We optimized the pillar density by tuning crystal growth condition in order to apply it to OPV cells.

    DOI: 10.1021/am100915s

  • Enhanced figure of merit of a porous thin film of bismuth antimony telluride 査読

    Makoto Kashiwagi, Shuzo Hirata, Kentaro Harada, Yanqiong Zheng, Koji Miyazaki, Masayuki Yahiro, Chihaya Adachi

    APPLIED PHYSICS LETTERS   98 ( 2 )   23114   2011年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A porous thin film of Bi(0.4)Te(3)Sb(1.6) with an enhanced figure of merit of 1.8 at room temperature was fabricated by flash evaporation on an alumina substrate containing hexagonally arranged nanopores with an average diameter of 20 nm, separated by an average distance of 50 nm. The thermal conductivity was significantly reduced compared with standard Bi(0.4)Te(3)Sb(1.6) films to 0.25 W/(m.K) with no major decrease in either the electrical conductivity (398 S/cm) or the Seebeck coefficient (198 mu V/K). The reduction in thermal conductivity was rationalized using a model for the full distribution of the phonon mean free path in the film. (c) 2011 American Institute of Physics. [doi:10.1063/1.3543852]

    DOI: 10.1063/1.3543852

  • Strategies for enhanced light extraction from surface plasmons in organic light-emitting diodes 査読 国際誌

    Jorg Frischeisen, Bert Scholz, Benedikt Arndt, Tobias Schmidt, Robert Gehlhaar, Chihaya Adachi and Wolfgang Brutting

    J. Photonics for Energy   1   2011年1月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1117/1.3523314

  • Highly conductive interface between a rubrene single crystal and a molybdenum oxide layer and its application in transistors 査読

    Hajime Nakanotani, Hayato Kakizoe, Chihaya Adachi

    SOLID STATE COMMUNICATIONS   151 ( 1 )   93 - 96   2011年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The formation of interfacial hole carriers between a rubrene single crystal and a 2 nm-thick molybdenum oxide layer resulted in the formation of a highly conductive Interface with a high electrical conductivity of 0 16 S/cm and a very small activation energy of 003 eV This highly conductive interface enabled charge injection and accumulation of a high drain current in the recombination zone in ambipolar transistors resulting in a significant reduction of the driving voltage with high balanced hole and electron mobilities of 11 and 0 5 cm(2)/Vs respectively (C) 2010 Elsevier Ltd All rights reserved

    DOI: 10.1016/j.ssc.2010.10.004

  • Organic molecules based on dithienyl-2,1,3-benzothiadiazole as new donor materials for solution-processed organic photovoltaic cells 査読

    Zhonglian Wu, Benhu Fan, Feng Xue, Chihaya Adachi, Jianyong Ouyang

    SOLAR ENERGY MATERIALS AND SOLAR CELLS   94 ( 12 )   2230 - 2237   2010年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Polymers based on dithienyl-2,1,3-benzothiadiazole (TBT) have received strong attention as the donor materials of polymer photovoltaic cells (PVs), since they can have a low band gap. But soluble small organic molecules based on TBT have been rarely studied. This paper reports the synthesis of two small organic molecules based on TBT and their application as the donor materials of solution-processed bulk heterojunction organic photovoltaic cells (OPVs). These compounds were soluble in common organic solvents, such as chloroform, chlorobenzene and tetrahydrofuran. They have band gaps comparable to poly(3-hexylthiophene) (P3HT) and lower HOMO and LUMO (HOMO: highest occupied molecular orbital. LUMO: lowest unoccupied molecular orbital) levels than P3HT. These molecules and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were used as the donors and acceptor to fabricate bulk heterojunction OPVs through solution processing. After optimization of the experimental conditions, power conversion efficiency (PCE) of 0.66&#37; was achieved on the solution-processed OPVs under AM 1.5G, 100 mW cm(-2) illumination. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.solmat.2010.07.017

  • Organic molecules based on dithienyl-2,1,3-benzothiadiazole as new donor materials for solution-processed organic photovoltaic cells 査読

    Zhonglian Wu, Benhu Fan, Feng Xue, Chihaya Adachi, Jianyong Ouyang

    SOLAR ENERGY MATERIALS AND SOLAR CELLS   94 ( 12 )   2230 - 2237   2010年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Polymers based on dithienyl-2,1,3-benzothiadiazole (TBT) have received strong attention as the donor materials of polymer photovoltaic cells (PVs), since they can have a low band gap. But soluble small organic molecules based on TBT have been rarely studied. This paper reports the synthesis of two small organic molecules based on TBT and their application as the donor materials of solution-processed bulk heterojunction organic photovoltaic cells (OPVs). These compounds were soluble in common organic solvents, such as chloroform, chlorobenzene and tetrahydrofuran. They have band gaps comparable to poly(3-hexylthiophene) (P3HT) and lower HOMO and LUMO (HOMO: highest occupied molecular orbital. LUMO: lowest unoccupied molecular orbital) levels than P3HT. These molecules and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were used as the donors and acceptor to fabricate bulk heterojunction OPVs through solution processing. After optimization of the experimental conditions, power conversion efficiency (PCE) of 0.66&#37; was achieved on the solution-processed OPVs under AM 1.5G, 100 mW cm(-2) illumination. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.solmat.2010.07.017

  • Fluoro-substituted Phenyleneethynylenes Acetylenic n-Type Organic Semiconductors 査読

    Daisuke Matsuo, Xin Yang, Akiko Hamada, Kyo Morimoto, Takuji Kato, Masayuki Yahiro, Chihaya Adachi, Akihiro Orita, Junzo Otera

    CHEMISTRY LETTERS   39 ( 12 )   1300 - 1302   2010年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Fluoro-substituted phenyleneethynylenes are synthesized by Sonogashira coupling and acetylide-nucleophilic substitution of fluorobenzenes Fluoro-substitution of benzenes enables deep LUMO potential, and CF3-substitution provides high electron mobility in deposited film (mu = 5 5 x 10(-2) cm(2) V-1 s(-1))

    DOI: 10.1246/cl.2010.1300

  • Nanocrystal growth and improved performance of small molecule bulk heterojunction solar cells composed of a blend of chloroaluminum Phthalocyanine and C70 査読 国際誌

    Kentaro Harada, Tomohiko Edura and Chihaya Adachi

    Appl. Phys. Exp.   3   2010年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1143/APEX.3.121602

  • A distributed-feedback organic waveguide blue laser using spirobifluorene derivatives 査読

    Hirotaka So, Hirofumi Watanabe, Yu Yang, Yuji Oki, Chihaya Adachi, Masayuki Yahiro

    TENCON 2010: 2010 IEEE REGION 10 CONFERENCE   440 - 443   2010年11月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    In this study, we synthesized the new spirobifluorene derivatives; hexylbiphenyl-spirobifluorene (HBP-Spiro) and demonstrated the operation of a distributed-feedback polymer waveguide blue laser. In addition, we investigated the optical and lasing properties of spirobifluorene derivatives including photostability. The maximum experimental slope efficiency and the energy threshold of a HBP-Spiro-doped waveguide laser were 3.6&#37; and 1.9 mu J, respectively. An operation lifetime of 27,000 shots was obtained for a pump-pulse duration of 1.2 ns and energy of 3.0 mu J at a wavelength of 355 nm.

  • Horizontal Molecular Orientation in Vacuum-Deposited Organic Amorphous Films 査読

    Daisuke Yokoyama, Chihaya Adachi

    WOLEDS AND ORGANIC PHOTOVOLTAICS: RECENT ADVANCES AND APPLICATIONS   137 - +   2010年10月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    Organic amorphous films fabricated by vacuum deposition have been used as essential components in organic light-emitting diodes (OLEDs) because they have the advantages of nanometer-scale surface smoothness and easy controllability of thickness. However, molecular orientation in organic amorphous films has been disregarded for the past 20 years since the beginning of the research on OLEDs. Here, we demonstrate horizontal molecular orientation in neat and doped organic amorphous films and show the general relationship between molecular structures and the molecular orientation. It was found that when molecular structure is linear or planar, the anisotropy of the molecular orientation in films becomes generally large. The results show the vital importance of the horizontal molecular orientation to understand the light emission and the carrier transport in OLEDs. To elucidate the device physics in OLEDs, the molecular orientation in amorphous films should generally be taken into consideration.

    DOI: 10.1007/978-3-642-14935-1_5

  • Suppression of roll-off characteristics of electroluminescence at high current densities in organic light emitting diodes by introducing reduced carrier injection barriers 査読

    Yousuke Setoguchi, Chihaya Adachi

    JOURNAL OF APPLIED PHYSICS   108 ( 6 )   64516   2010年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We experimentally investigated suppression of the roll-off characteristics of the electroluminescence efficiency at high current densities in organic light emitting diodes (OLEDs). To increase exciton density, we propose a nonheterostructure OLED that consists of a single emitting layer of 4,4'-bis[(N-carbazole)styryl]biphenyl (BSB-Cz) and layers locally with doped donors/acceptors on the cathode and anode sides. The OLED exhibited suppression of the roll-off characteristics at high current densities over 100 A/cm(2) with balanced bipolar injection and transport, resulting in the high exciton density of 10(24) cm(-3) s(-1). Furthermore, amplified spontaneous emission with a relatively low threshold of E(th)=24 mu J/cm(2) was obtained by optically pumping the single-layer device. However, to realize electrical excitation it was necessary to reduce the lasing threshold by two orders of magnitude or to inject a 100 times higher current density. (C) 2010 American Institute of Physics. [doi:10.1063/1.3488883]

    DOI: 10.1063/1.3488883

  • 3,6-Diarylcarbazole Derivatives as a Host Material in Organic Electrophosphorescent Diodes 査読

    Kenji Muneuchi, Masaomi Sasaki, Hiroyuki Sasabe, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 8 )   2010年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We synthesized 3,6-diarylcarbazole (CBZ) derivatives and investigated their thin-film optical (i e, absorption, fluorescence and phosphorescence) properties and electroluminescence characteristics We fabricated phosphorescent organic light-emitting diodes (OLEDs) employing CBZ derivatives as the host and fac-tris(2-phenypyridine)iridium [Ir(ppy)(3)] as the guest at a doping concentration of 6 wt &#37; These devices exhibited maximum external quantum efficiencies (eta(ext)) in the range 1 to 11&#37;, depending on the host In particular, the OLED with CBZ7 as the host exhibited the highest eta(ext) of 11 2&#37; and a maximum power conversion efficiency (eta(energy)) of 25Im/W (C) 2010 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.49.080208

  • In situ real-time spectroscopic ellipsometry measurement for the investigation of molecular orientation in organic amorphous multilayer structures 査読

    Daisuke Yokoyama, Chihaya Adachi

    JOURNAL OF APPLIED PHYSICS   107 ( 12 )   2010年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To investigate molecular orientation in organic amorphous films, in situ real-time spectroscopic ellipsometry measurements were performed during vacuum deposition. Three materials with different molecular shapes were adopted to confirm the generality of the molecular orientation. In all three cases, more than 200 000 values for the ellipsometric parameters measured during deposition were well simulated simultaneously over the entire spectral range and measurement period using a simple model where the films possessed homogeneous optical anisotropy. This demonstrated the homogeneity of the molecular orientation in the direction of film thickness. The molecular orientation can be controlled by the substrate temperature even in multilayer structures. It is also demonstrated that a "multilayer structure" can be fabricated using only one material, where each layer has different optical and electrical properties. (C) 2010 American Institute of Physics. [doi:10.1063/1.3432568]

    DOI: 10.1063/1.3432568

  • Improved thermoelectric performance of organic thin-film elements utilizing a bilayer structure of pentacene and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F-4-TCNQ) 査読

    Kentaro Harada, Mao Sumino, Chihaya Adachi, Saburo Tanaka, Koji Miyazaki

    APPLIED PHYSICS LETTERS   96 ( 25 )   2010年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate an improved thermoelectric performance of small molecular thin films fabricated by thermal deposition of pentacene as a p-type conduction layer. To enhance the performance, a bilayer structure composed of an intrinsic pentacene layer and an acceptor 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane layer is utilized as the prototype thermoelectric element. With the bilayer structure, the electrical conductivity reaches 0.43 S/cm, exhibiting a positive Seebeck coefficient of about 200 mu V/K. We thus obtain a high power factor of 2.0 mu W/mK(2) with an optimized layer thickness. (C) 2010 American Institute of Physics. [doi:10.1063/1.3456394]

    DOI: 10.1063/1.3456394

  • Photoluminescence Characteristics of Organic Host Materials with Wide Energy Gaps for Organic Electrophosphorescent Devices 査読

    Ayataka Endo, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 5 )   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The photoluminescence, i.e., fluorescence and phosphorescence, characteristics of host materials with wide energy gaps suitable for phosphorescence-based organic light-emitting diodes (OLEDs) are summarized. In the vacuum deposited films, the host materials show phosphorescent emission in the blue to green region and triplet energy levels of E(T) = 2.6-3.1 eV because of the presence of steric hindrance. An OLED containing 1,2,3,4-tetraphenyl-5-(3-pyridyl)benzene as a host and iridium(III) bis[(4,6-difluorophenyl)-pyridinato-N,C(2)]picolinate as a blue emissive phosphorescent dopant exhibits an external electroluminescence efficiency of similar to 12&#37;. (C) 2010 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.49.050205

  • Emission Color Tuning in Ambipolar Organic Single-Crystal Field-Effect Transistors by Dye-Doping 査読

    Hajime Nakanotani, Masatoshi Saito, Hiroaki Nakamura, Chihaya Adachi

    ADVANCED FUNCTIONAL MATERIALS   20 ( 10 )   1610 - 1615   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The effect of dye-doping in ambipolar light-emitting organic field-effect transistors (LE-OFETs) is investigated from the standpoint of the carrier mobilities and the electroluminescence (EL) characteristics under ambipolar operation. Dye doping of organic crystals permits not only tuning of the emission color but also significantly increases the efficiency of ambipolar LE-OFETs. A rather high external EL quantum efficiency (similar to 0.64&#37;) of one order of magnitude higher than that of a pure p-distyrylbenzene (P3V2) single crystal is obtained by tetracene doping. The doping of tetracene molecules into a host P3V2 crystal has almost no effect on the electron mobility and the dominant carrier recombination process in the tetracene-doped P3V2 crystal involves direct carrier recombination on the tetracene molecules.

    DOI: 10.1002/adfm.200902339

  • In situ real-time spectroscopic ellipsometry measurement for investigation of molecular orientation in organic amorphous multilayer structures 国際誌

    Daisuke Yokoyama,Chihaya Adachi

    J.Appl.Phys.   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Orientation control of linear-shaped molecules in vacuum-deposited organic amorphous films and its effect on carrier mobilities 国際誌

    Daisuke Yokoyama ,Yousuke Setoguchi,Akiko Sakaguchi,Michio Suzuki,Chihaya Adachi

    Adv.Funct.Mat..   ( 20 )   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Preparation under high humidity conditions of nano-porous polymer film with 80 nm minimum pore size 国際誌

    Takatoshi Nishio, Makoto Kashiwagi,Koji Miyazaki,Masayuki Yahiro,Chihaya Adachi

    Appl.Phys.Exp..   ( 3 )   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Organic light-emitting diodes containing multilayers of organic single crystals 国際誌

    Hajime Nakanotani,Chihaya Adachi

    Appl.Phys.Lett..   ( 96 )   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Reduced initial degradation of bulk heterojunction organic solar cells by incorporation of stacked fullerene and lithium fullerene interlayers 国際誌

    Kenji Kawano,Chihaya Adachi

    Appl.Phys.Lett..   ( 96 )   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Photoluminescence characteristics of organic host materials with wide energy gaps for organic electrophosphorecent devices 国際誌

    Ayataka Endo,Chihaya Adachi

    Jpn.JAppl..Phys.   ( 49 )   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Formation of Organic Nanodots with a Minimum Diameter of 40 nm Using Conventional Vacuum Vapor Deposition 査読

    Manabu Nakata, Kenji Kawano, Mao Yasumatsu, Masayuki Yahiro, Chihaya Adachi

    APPLIED PHYSICS EXPRESS   3 ( 5 )   2010年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Conventional vacuum deposition onto a substrate coated with a self-assembled monolayer (SAM) was used to produce arrays of hemispherical nanostructures composed of organic semiconducting materials with low molecular weight. The nanostructures had a minimum diameter of 40 nm, indicating that cluster formation occurred in the gas phase during vacuum deposition. The size and shape of the nanostructures were controlled by the underlying SAMs, organic semiconducting materials, film thickness and substrate temperature. (C) 2010 The Japan Society of Applied Physics

    DOI: 10.1143/APEX.3.055201

  • Emission color tuning in ambipolar organic single crystal field-effect transistors by dye-doping 国際誌

    Hajime Nakanotani,Masatoshi Saitou,Hiroaki Nakamura,Chihaya Adachi

    Adv.Funct.Mat   2010年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Determination of molecular dipole orientation in fluorescent organic thin films by photoluminescence measurement 国際誌

    Joerg Frischeisen ,Daisuke Yokoyama,Chihaya Adachi, Wolfgang Bruetting

    Appl.Phys.Lett.   ( 96 )   2010年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Exciplex formations at HTL/Alq3 interface in organic light-emitting diode: influence of electron-hole recombination zone and electric field 国際誌

    Naoki Matsumoto,Chihaya Adachi

    J.Phys.Chem.C.   ( 114(10) )   2010年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Formation of Organic Nanodots with a Minimum Diameter of 40 nm Using Conventional Vacuum Vapor Deposition 国際誌

    Manabu Nakata,Kenji kawano, Mao Yasumatsu,Masayuki Yahiro,Chihaya Adachi

    Appl.Ohys.Exp..   ( 3 )   2010年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Exciplex Formations at the HTL/Alq(3) Interface in an Organic Light-Emitting Diode: Influence of the Electron-Hole Recombination Zone and Electric Field 査読

    Naoki Matsumoto, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   114 ( 10 )   4652 - 4658   2010年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this work, we investigate the influence of weak intermolecular interactions, which have not previously been carefully considered, in hole transport material (HTM)/tris(8-hydroxyquinoline)aluminum) (Alq(3))-based organic light-emitting diodes (OLEDs). Although such weak interactions quench Alq(3) fluorescence, no significant spectral shift is identified. Electroluminescence of OLEDs containing HTM-Alq(3) codeposited (mixed) emitter is quenched by the Formation of such exciplexes. In general, the electroluminescence quantum efficiency of OLEDs correlates closely with the photoluminescence quantum yields of HTM:Alq(3) codeposited films. In contrast, in all OLED containing a layered structure of HTM/Alq(3), exciplexes ire less effective at quenching the electroluminescence of AIq(3). Because exciplexes form only at the interface between the HTM and AIq3 layers in HTM/Alq(3)-based OLEDs, exciplex formation is affected not only by the electron donating nature of the HTM but also by the position of the electron-hole recombination zone and the application of an external electric field during OLED operation.

    DOI: 10.1021/jp9121062

  • Preparation under High Humidity Conditions of Nanoporous Polymer Film with 80 nm Minimum Pore Size 査読

    Takatoshi Nishio, Makoto Kashiwagi, Koji Miyazaki, Masayuki Yahiro, Chihaya Adachi

    APPLIED PHYSICS EXPRESS   3 ( 2 )   2010年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Nanoporous polymer film with the smallest pore size of 80 nm was obtained from 0.2 wt&#37; polystyrene/dichloromethane solution at 4 degrees C by the dip-coating method in conjunction with an evaporative humidifier. Fabrication parameters affecting the pore size such as wet coating thickness, solution temperature, and nozzle-substrate gap were varied. The distance between pores depends on the nozzle-substrate gap. For fabrication of the nanosized pores, an appropriate drying time prevents the water droplets from coalescing. Formation of the nanoporous surface structure in the films depends on the solution concentration and solution temperature preventing too rapid drying. (C) 2010 The Japan Society of Applied Physics DOI: 10.1143/APEX.3.025201

    DOI: 10.1143/APEX.3.025201

  • Reduced initial degradation of bulk heterojunction organic solar cells by incorporation of stacked fullerene and lithium fluoride interlayers 査読

    Kenji Kawano, Chihaya Adachi

    APPLIED PHYSICS LETTERS   96 ( 5 )   2010年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Reduced initial degradation of bulk heterojunction organic solar cells (OSCs) was achieved by inclusion of stacked fullerene (C(60)) and lithium fluoride interlayers. By inserting a 3 nm C(60) layer and a 0.5 nm LiF layer between the photoactive layer and Al cathode in an OSC, the device lifetime calculated after an initial 8 h continuous illumination period was dramatically improved, with a decrease of only 5&#37; in the power conversion efficiency. The 3 nm C(60) layer forms a unique surface pattern of microscopic domes, and the combination of this layer with a 0.5 nm LiF layer formed an Ohmic-like contact between the photoactive layer and the Al cathode, resulting in a significant reduction in the degradation of the OSC.

    DOI: 10.1063/1.3297876

  • Determination of molecular dipole orientation in doped fluorescent organic thin films by photoluminescence measurements 査読

    Joerg Frischeisen, Daisuke Yokoyama, Chihaya Adachi, Wolfgang Bruetting

    APPLIED PHYSICS LETTERS   96 ( 7 )   2010年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The orientation of the transition dipole moments of fluorescent organic molecules doped into a matrix material is determined by photoluminescence measurements of the angular dependent emission spectra and by comparison with simulations. The analysis of two small molecular materials doped into a 4,4(')-bis(N-carbazole)-biphenyl matrix is demonstrated, yielding a horizontal orientation of 91&#37; for 4,4(')-bis[4-(diphenylamino)styryl]biphenyl and a completely random orientation in case of tris-(8-hydroxyquinoline)aluminum (Alq(3)). This expeditious technique does not require detailed information about the optical properties of the dopant, making this method particularly suitable for characterizing newly developed materials for organic light-emitting diodes with enhanced light-outcoupling efficiency.

    DOI: 10.1063/1.3309705

  • Organic light-emitting diodes containing multilayers of organic single crystals 査読

    Hajime Nakanotani, Chihaya Adachi

    APPLIED PHYSICS LETTERS   96 ( 5 )   2010年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Double-heterostructure (DH) organic light-emitting diodes (OLEDs) with thick carrier transport layers based on organic single crystals have been fabricated. Although the total thickness of the organic layers (similar to 1.4 mu m) is one order of magnitude greater than that of conventional thin-film OLEDs, a current density of 100 mA/cm(2) was achieved at 19 V. The major advantage of the single crystal-based DH-OLED was that a very low applied electric field (similar to 10(4) V/cm) was required for the onset of carrier injection and transport, because of the high carrier mobilities of the single crystal layers.

    DOI: 10.1063/1.3298558

  • Orientation Control of Linear-Shaped Molecules in Vacuum-Deposited Organic Amorphous Films and Its Effect on Carrier Mobilities 査読

    Daisuke Yokoyama, Yousuke Setoguchi, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi

    ADVANCED FUNCTIONAL MATERIALS   20 ( 3 )   386 - 391   2010年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The molecular orientation of linear-shaped molecules in organic amorphous films is demonstrated to be controllable by the substrate temperature. It is also shown that the molecular orientation affects the charge-transport characteristics of the films. Although linear-shaped 4,4'-bis[{N-carbazole}styryl]biphenyl molecules deposited on substrates at room temperature are horizontally oriented in amorphous films, their orientation when deposited on heated substrates with smooth surfaces becomes more random as the substrate temperature increases, even at temperatures under the glass transition temperature. Another factor dominating the orientation of the molecules deposited on heated substrates is the surface roughness of the substrate. Lower carrier mobilities are observed in films composed of randomly oriented molecules, demonstrating the significant effect of a horizontal molecular orientation on the charge-transport characteristic of organic amorphous films.

    DOI: 10.1002/adfm.200901684

  • Durable & printable blue-violet DFB solid-state dye lasers using spirobifluorene derivatives 査読

    H. Watanabe, M. Yahiro, Y. Yang, Y. Oki, C. Adachi

    2009 LASERS & ELECTRO-OPTICS & THE PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1 AND 2   1184 - +   2009年12月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    Spirobifluorene derivative, as novel and high performance organic compound for light emitting diodes, shows laser action in a distributed feedback waveguide cavity This compound was developed for wet process such as a pritable laser fabrication system Spirobifluorene-doped distributed feedback solid-state laser shows loger durability than traditional

    DOI: 10.1109/CLEOPR.2009.5292352

  • Thermally Activated Delayed Fluorescence from Sn4+-Porphyrin Complexes and Their Application to Organic Light-Emitting Diodes - A Novel Mechanism for Electroluminescence 査読

    Ayataka Endo, Mai Ogasawara, Atsushi Takahashi, Daisuke Yokoyama, Yoshimine Kato, Chihaya Adachi

    ADVANCED MATERIALS   21 ( 47 )   4802 - +   2009年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Electroluminescence based on TADF, that is, thermally activated delayed fluorescence, is demonstrated in Sn4+-porphyrin complexes. On excitation by a short electrical pulse, prompt and delayed electroluminescence components were clearly observed. The delayed component was composed of both TADF and phosphorescence (see figure), and the TADF component significantly increased with increasing temperature.

    DOI: 10.1002/adma.200900983

  • Enhancement of electron transport by horizontal molecular orientation of oxadiazole planar molecules in organic amorphous films 査読

    Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi

    APPLIED PHYSICS LETTERS   95 ( 24 )   2009年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To demonstrate the effect of molecular orientation on charge transport characteristics in vacuum-deposited organic amorphous films, the electrical and optical properties of films of two oxadiazole derivatives were investigated. One of them has bulky tert-butyl terminals and forms an isotropic film, whereas the other has planar bipyridyl terminals and forms a highly anisotropic film. The very large optical anisotropy of the latter means that the planar molecules stack horizontally, leading to large overlaps of pi-orbitals and more than 30 times higher electron mobility though the geometric and electronic structures of the main conformers of the two derivatives are quite similar.

    DOI: 10.1063/1.3274135

  • Photoluminescence characteristics of tris(2-phenylquinoline)iridium(III) dispersed in an iridium complex host layer 査読

    Ayataka Endo, Chihaya Adachi

    CHEMICAL PHYSICS LETTERS   483 ( 4-6 )   224 - 226   2009年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We studied the photoluminescence (PL) characteristics of the red phosphor tris(2-phenylquinoline)iridium(III) (Ir(phq)(3)) doped into an Ir complex host layer. Although we expect efficient triplet exciton confinement by the host Ir complexes because of their triplet energy level being higher than that of Ir(phq)(3), we observed a rather low PL quantum efficiency. We clarified that the short Forster energy transfer distance in the host layers resulted in limited energy transfer between host and guest molecules. (C) 2009 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.cplett.2009.10.064

  • Evaluating Carrier Accumulation in Degraded Bulk Heterojunction Organic Solar Cells by a Thermally Stimulated Current Technique 査読

    Kenji Kawano, Chihaya Adachi

    ADVANCED FUNCTIONAL MATERIALS   19 ( 24 )   3934 - 3940   2009年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Here, the initial photo-degradation of encapsulated P3HT:PCBM bulk heterojunction organic solar cells is investigated. The degraded device is recovered by thermal annealing treatment. Thermally stimulated current measurements reveal that the cause of photo-degradation is carrier accumulation and that the degraded organic solar cell has two broad trap levels, of 0.71 and 0.81 eV. These traps are independent of the thickness of the photoactive layers, the mixing ratio of the photoactive materials and the cathode materials. In addition, it is confirmed that there is a close relationship between the degree of degradation and the amount of accumulated charge carriers.

    DOI: 10.1002/adfm.200901573

  • Enhancement of electron transport by horizontal molecular orientation of oxadiazole planar molecules in organic amorphous films 国際誌

    Daisuke Yokoyama,Akio Sakaguchi,Michio Suzuki,Chihaya Adachi

    Appl.Phys.Lett.   ( 95 )   2009年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Dependence of polarization splitting on mode tuning in microcavities 査読

    F. Becker, M. Langner, H. Froeb, V. G. Lyssenko, K. Leo, C. Adachi

    APPLIED PHYSICS LETTERS   95 ( 19 )   2009年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We present an in-depth analysis of the angle and mode tuning dependence of the polarization splitting in detuned organic microcavities. The system consists of highly reflecting dielectric mirrors comprising a continuous wedge-shaped cavity layer of 4,4'-bis(N-carbazole)-biphenyl, doped with 2 wt &#37; of 4,4'-bis[(N-carbazole)styryl]-biphenyl as the active material. By varying the measurement position across the sample, we shift the resonant mode with respect to the center of the cavity stop band. Starting from small detunings, the splitting value increases non-linearly up to 58 meV, when the resonant modes reach the stop band edge. We compare this behavior with results from transfer matrix calculations and theoretical predictions. (c) 2009 American Institute of Physics

    DOI: 10.1063/1.3263145

  • Effect of Molecular Morphology on Amplified Spontaneous Emission of Bis-Styrylbenzene Derivatives 査読

    Ryota Kabe, Hajime Nakanotani, Tomo Sakanoue, Masayuki Yahiro, Chihaya Adachi

    ADVANCED MATERIALS   21 ( 40 )   4034 - +   2009年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Molecular aggregation greatly affects the fluorescence quantum efficiency, transient lifetime, and amplified spontaneous emission (ASE) of bis-styrylbenzene derivatives. We compare the optical properties for various morphologies (solution, film, doped film, and single crystalline state) (see figure) and demonstrate that ambi-polar operation of a 1,4-bis(4-methylstyryl) benzene layer in field-effect transistors leads to intense blue electroluminescence with a rather sharp emission width.

    DOI: 10.1002/adma.200803588

  • Organic light-emitting devices using organic thin-film single crystals 査読

    Hajime Nakanotani, Chihaya Adachi

    EURODISPLAY 2009   50 - 51   2009年9月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    In this paper, we demonstrate single crystal organic light emitting diodes (OLEDs). The OLEDs were operated with one order of magnitude lower electrical field for the onset of carrier injection and transport compared to conventional OLEDs. Organic single crystals are also useful for significant improvement of light emitting characteristics in ambipolar organic :field effect transistors.

  • Tuning of threshold voltage by interfacial carrier doping in organic single crystal ambipolar light-emitting transistors and their bright electroluminescence 査読

    Hajime Nakanotani, Masatoshi Saito, Hiroaki Nakamura, Chihaya Adachi

    APPLIED PHYSICS LETTERS   95 ( 10 )   2009年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic light-emitting field-effect transistors, based on a p-bis[(p-styryl)styryl] benzene (P5V4) single crystal, that possess high mobilities of over 0.1 cm(2)/V s for both electrons and holes were fabricated. For a small charge injection barrier and successive formation of high exciton density in the carrier recombination zone, the hole accumulation threshold voltage was significantly reduced by interfacial hole doping based on electron transfer from P5V4 molecules to a molybdenum oxide layer. The threshold voltage for hole accumulation was drastically decreased from -80 +/- 3 to 2 +/- 3 V, leading to dual charge injection and accumulation of a very high current density of J>100 A cm(-2) with intense edge electroluminescence.

    DOI: 10.1063/1.3216047

  • Single molecule color controllable light emitting organic field effect transistors for white light emission with high color stability 査読

    Tung-Huei Ke, Robert Gehlhaar, Chih-Hsin Chen, Jiann-T Lin, Chung-Chih Wu, Chihaya Adachi

    APPLIED PHYSICS LETTERS   95 ( 6 )   2009年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors report on color controllable white light emission from a unipolar organic light emitting transistor. We demonstrate light emission with two distinct peaks: a spectrally narrow blue emission from monomers and a yellow broadband emission created close to the interface of the organic film and SiO(2). Due to the functionality of Mg/Au stacked electrodes, we are able to position the recombination zone via gate voltage control. Therefore, we are able to shift the spectral peak position and change the emission intensity independently by the drain voltage. The emission color is tunable from CIE coordinates (0.27, 0.28) to (0.40, 0.41).

    DOI: 10.1063/1.3202763

  • Organic Thin-Film Solar Cells Using Electron-Donating Perylene Tetracarboxylic Acid Derivatives 査読

    Yuki Shibano, Hiroshi Imahori, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   113 ( 34 )   15454 - 15466   2009年8月

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    記述言語:英語  

    Various electron-donating amino groups were introduced into the perylene core of perylene tetracarboxylic acid derivatives (PTCs) to address the potential use in organic solar cells. Broad absorptions of the PTC solutions in the visible to near-infrared (NIR) region suggest that PTCs are promising light-harvesting molecules for solar cells. Electrochemical measurements reveal that the introduction of the electron-donating amino groups makes the energy level of the highest occupied molecular orbital (HOMO) shallow, imparting electron-rich characteristics to the PTCs. The electronic properties of the PTCs are studied oil the basis of quantum chemical calculations. The results show that the variation of the amino groups has a significant influence oil the HOMO level, while the lowest unoccupied molecular orbital (LUMO) level is relatively sensitive to the electronegativity of the PTC terminal atoms. The PTC thin films exhibit broad absorption bands in the visible to NIR region, as for the PTC solutions, and possess relatively shallow HOMO and LUMO energies that are higher or comparable to those of fullerene C-60. These excellent properties encouraged us to employ amine-substituted PTCs as electron donors in a thin film solar cell with C-60 as an n-type semiconductor, Photovoltaic devices with 1 structure of indium tin oxide (ITO)/PTCS/C-60/bathocuproine (BCP)/Al were fabricated by spin-coating PTCs on ail ITO electrode. The devices with perylene tetracarboxylic acid diimides (PTCDIs), bearing highly basic amino groups (Py-PTCDI, Me2N-PTCDI,and Ph2N-PTCDI), exhibit the higher power conversion efficiencies than those with carbazoyl PTCDI (Cz-PTCDI) and perylene tetracarboxylic acid dianhydrides (PTCDAs). The higher device performance originates from the efficient electron transfer from the PTCs to C-60 as the results of the relatively shallow HOMO and LUMO levels of the PTCs bearing the highly basic amino groups. The dependence of the device performance on the PTC film thickness indicates that the introduction of diphenylamino groups on the perylene core suppresses the nonradiative decay of the exciton without decreasing the hole mobility. These results will provide important information for the molecular design of post PTC derivatives.

    DOI: 10.1021/jp9045726

  • Organic light-emitting diode with liquid emitting layer 査読

    Denghui Xu, Chihaya Adachi

    APPLIED PHYSICS LETTERS   95 ( 5 )   2009年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate an original organic light-emitting diode (OLED) having a neat liquid host of 9-(2-ethylhexyl)carbazole (EHCz) doped with a guest emitter of 5,6,11,12-tetraphenylnapthacene (rubrene). The device structure is composed of indium tin-oxide (ITO)/poly(3,4-ethylenedioxythiophene):poly(styrenesulphonate)/EHCz:rubrene/Cs(2)CO(3)/ITO. We demonstrate that the liquid organic semiconducting layer surely transports charge carriers, leading to electroluminescence from rubrene with the highest external quantum efficiency of eta(ext)=0.03&#37; at a current density of 0.26 mA/cm(2). Our demonstration of the liquid-OLEDs will open another possibility of organic semiconductors and light-emitting applications.

    DOI: 10.1063/1.3200947

  • Organic light-emitting diode having liquid emitting layer 国際誌

    Denghui Xu Ke,Chihaya Adachi

    Appl.Phys.Lett..   ( 95 )   2009年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Control of the molecular orientation of a 2,2(')-bithiophene-9,9-dioctylfluorene copolymer by laser annealing and subsequent enhancement of the field effect transistor characteristics 査読

    Korefumi Kubota, Takuji Kato, Chihaya Adachi

    APPLIED PHYSICS LETTERS   95 ( 7 )   2009年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We controlled the orientation of a 2,2(')-bithiophene-9,9-dioctylfluorene (F8T2) copolymer spin-coated film on a polycarbonate substrate using a laser-annealing technique and demonstrated an enhancement of the field-effect transistor characteristics. We used a semiconductor laser, having a lasing wavelength of lambda=405 nm, with a small spot size of 400 nm. Using polarizing optical microscopy and x-ray diffraction analysis, we confirmed enhancement of the orientation of the molecular chains of F8T2, along the laser scanning direction. Following laser annealing, the field-effect hole mobility resulted in a value of mu=1.6x10(-3) cm(2)/V s, which is about three times higher than that of the unannealed sample.

    DOI: 10.1063/1.3211125

  • Thermally activated delayed fluorescence from Sn4+-porphyrin comlexes and their application to organic light emitting diodes-a novel mechanism for electroluminescence 国際誌

    Ayataka Endo,Mai Ogasawara,Atsushi Takahashi,Disuke Yokoyama,Yoshimine Katou,Chihaya Adachi

    Adv.Mater   ( 21 )   2009年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Control of the molecular orientation of a 2,2`-bithiophene-9,9`-dioctylfluorene copolymer by laser-annealing and subsequent enhancement of FET characteristics 国際誌

    Korefumi Kubota,Takuji Kato, Chihaya Adachi

    Appl.PHys.Lett..   ( 95 )   2009年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Single molecule color controllable light emitting organic field effect transistors for white light emission with high color stability 国際誌

    Tung-Huei Ke,Robert Gehlhaar,Chih-Hsin Chen,Jiaan-T Lin,Chung-Chih Wu,Chihaya Adachi

    Appl.Phys.Lett..   ( 95 )   2009年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Highly balanced ambipolar mobilities with intense electroluminescence in field-effect transistors based on organic single crystal oligo(p-phenylenevinylene) derivatives 査読

    Hajime Nakanotani, Masatoshi Saito, Hiroaki Nakamura, Chihaya Adachi

    APPLIED PHYSICS LETTERS   95 ( 3 )   2009年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Single crystal organic field-effect transistors (FETs) based on highly luminescent oligo(p-phenylenevinylene) (OPV) derivatives are fabricated. Although OPV single crystal FETs show both p- and n- type FET operation, we found that an increase in the conjugation length of the OPV derivatives from three phenylene rings (P3V2) to four phenylene rings (P4V3) results in an improvement in the electron mobility by an order of magnitude, while retaining the high hole mobility. This molecular design, using P4V3, achieved an ambipolar light-emitting OFET with well-balanced high hole (0.12 cm(2)/V s) and electron (0.11 cm(2)/V s) mobilities, leading to intense electroluminescence.

    DOI: 10.1063/1.3184588

  • Organic Thin-Film Solar Cell Using Electron-Donating Perylene Tetracarboxylic Acid Derivatives 国際誌

    Y.Shibano,H.Imahori,C.Adachi

    J.Phys.Chem.C.   ( 113 )   2009年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Highly balanced ambipolar mobilities with intense electroluminescence in field-effect transistors based on organic single crystal oligo(p-phenylenevinylene)derivatives 国際誌

    Hajime Nakanotani,Masatoshi Saito,Hiroaki nakamura,Chihaya Adachi

    Appl.Phys.Lett..   ( 95 )   2009年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Low-Threshold Blue Emission from First-Order Organic DFB Laser Using 2,7-bis[4-(N-carbazole)phenylvinyl]-9,9 '-Spirobifluorene as Active Gain Medium 査読

    Masaya Hirade, Hajime Nakanotani, Reiji Hattori, Akihiro Ikeda, Masayuki Yahiro, Chihaya Adachi

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   504   1 - 8   2009年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    s We demonstrate optically excited lasing by an organic semiconducting thin-film based on 2,7-bis[4-(N-carbazole)phenylvinyl]-9,9'-spirobifluorene (spiro-SBCz) as an active gain medium with a first-order distributed feedback (DFB) reflector. We prepared DFB reflectors with periods from 132.5 to 145.00 nm and grooves from 70 to 140 nm depth by using electron-beam-lithography and plasma-etching techniques. The laser having a reflector with a 145.0 nm period had a lasing threshold of 0.72 +/- 0.07 mu J/cm(2), 83&#37; lower than its threshold of amplified spontaneous emission (4.1 +/- 0.4 mu J/cm(2)).

    DOI: 10.1080/15421400902938928

  • Charge separation and transport behavior of a two-dimensional charge sheet at organic donor-acceptor heterointerfaces 査読

    Tomo Sakanoue, Toru Irie, Chihaya Adachi

    JOURNAL OF APPLIED PHYSICS   105 ( 11 )   2009年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Charge separation and transport behavior were investigated at an organic heterolayered interface consisting of a 4,4', 4 ''- tris[3-methylphenyl(phenyl)amino] triphenylamine (m-MTDATA) organic donor and a hexadecafluoro-copper-phthalocyanine (F(16)CuPc) organic acceptor. A two-dimensional charge sheet of electron-hole pairs was induced due to the formation of charge-transfer complexes at the heterointerface. The induced charges could be separated by application of an electric field perpendicular to the heterointerface. The charge-separation behavior was independent of the work function of the contact electrodes but was strongly dependent on the energy-level alignment between the highest occupied molecular orbital of the donor molecules and the lowest unoccupied molecular orbital of the acceptor molecules. This enabled the preparation of an organic light-emitting diode without injecting holes from the anode. The charge-transport behavior along the heterointerface was also investigated by fabricating laterally arranged contact electrodes. The F(16)CuPc/m-MTDATA heterointerface exhibited high conductivity of 0.001 S/cm, which is seven orders of magnitude higher than that of a single-layer F(16)CuPc or m-MTDATA film. In situ electrical measurements during formation of the heterointerface enabled the effective thickness of the charge sheet to be determined as being accumulated within 2-3 nm, which corresponds to the bilayer of both F(16)CuPc and m-MTDATA. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3137192]

    DOI: 10.1063/1.3137192

  • Tunig of threshold voltage by interfacial carrier doping in organic single crystal ambipolar light-emittting transistors and their bright electroluminescence 国際誌

    Hajime Kubota,Msatoshi Saito,Hiroaki Nakamura, Chihaya Adachi

    Appl.Phys.Lett..   ( 95 )   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Molecular Modification of 2,7-Diphenyl[1]benzothieno[3,2-b]benzothiophene (DPh-BTBT) with Diarylamino Substituents: From Crystalline Order to Amorphous State in Evaporated Thin Films 査読

    Takafumi Izawa, Hiroki Mori, Yusuke Shinmura, Masahito Iwatani, Eigo Miyazaki, Kazuo Takimiya, Hsio-Wen Hung, Masayuki Yahiro, Chihaya Adachi

    CHEMISTRY LETTERS   38 ( 5 )   420 - 421   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Introduction of diarylamino substituents on 2,7-diphenyl[1]-benzothieno[3,2-b]benzothiophene (DPh-BTBT) caused morphological change in the evaporated thin-film state: from highly crystalline films with edge-on molecular orientation for DPh-BTBT to amorphous films for the diarylamino derivatives. The former was unsuitable as a hole-transporting layer in organic light-emitting diodes (OLEDs), whereas the latter acted as a superior hole-transporting layer in multilayered OLEDs.

    DOI: 10.1246/cl.2009.420

  • Blue emitting fluorophores of phenyleneethnylense substituted by diphenylethenyl terminal groups for organic light emitting diodes 国際誌

    Gouliang Mao,Akihiro Orita,Larysa Feneko,Masayuki Yahiro, Chihaya Adachi,Junzo Otera

    Mat.Chem.Phys..   ( 115 )   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Efficient deep-blue organic light-emitting diodes based on 9,9-bis(4-biphenyly)fluorene derivatives 国際誌

    N.Matsumoto,T.Miyazaki,M.Nishiyama,C.Adachi

    J.Phys.Chem.C.   ( 113 )   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Blue emitting fluorophores of phenyleneethynylenes substituted by diphenylethenyl terminal groups for organic light-emitting diodes 査読

    Guoliang Mao, Akihiro Orita, Larysa Fenenko, Masayuki Yahiro, Chihaya Adachi, Junzo Otera

    MATERIALS CHEMISTRY AND PHYSICS   115 ( 1 )   378 - 384   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Phenyteneethynylene motifs substituted by diphenylethenyl groups at both ends were prepared successfully by use of double elimination protocol of P-substituted sulfones for introducing phenyleneethynylene arrays followed by Wittig-Horner reaction for introducing diphenylethenyl moiety. The hybrid blue fluorophores exhibited strong emission even in the solid-state films (Phi(F) >= 0.60) while, in CHCl3 solution, incorporation of substituents on the central phenylene unit significantly enhanced emission efficiency UP to Phi(F) = 0.57. The OLED devices with use of these blue fluorophores as an emitting material provided maximum external quantum efficiency of eta(ext) = 2.4&#37;. (C) 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.matchemphys.2008.12.015

  • Effect of molecular morpholgy on amplified spontaneous emission of bis-styrylbenzene derivatives 国際誌

    Ryota Kabe,Hajime Nakanotani,Tomo Sakanoue,Masayuki Yahiro,Chihaya Adachi

    Adv.Mater..   ( 40 )   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Photoluminescence characteristics of tris(2-phenylquinoline)iridium (Ⅲ)dispersed in an iridium complex host layer 国際誌

    Ayataka Endou,Chihaya Adachi

    Chem.Phys.Lett..   ( 483 )   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Photoluminescence characteristics of tris(2-phenylquinoline)iridium (Ⅲ)dispersed in an iridium complex host layer 国際誌

    Ayataka Endou,Chihaya Adachi

    Chem.Phys.Lett..   ( 483 )   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Photoluminescence characteristics of tris(2-phenylquinoline)iridium (Ⅲ)dispersed in an iridium complex host layer 国際誌

    Ayataka Endou,Chihaya Adachi

    Chem.Phys.Lett..   ( 483 )   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • High efficiency blue light emitting unipolar transistor incorporating multifunctional electrodes 査読

    Tung-Huei Ke, Robert Gehlhaar, Chih-Hsin Chen, Jiann-T Lin, Chung-Chih Wu, Chihaya Adachi

    APPLIED PHYSICS LETTERS   94 ( 15 )   2009年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors report on blue light emitting unipolar organic light emitting transistors (OLETs) with external quantum efficiency up to 0.2&#37; by using multifunctional Mg/Au electrodes formed in combination with an efficient light emitting fluorene derivative. A mobility up to 6x10(-6) cm(2) V(-1) s(-1) has been achieved, which is comparable to previous results from time of flight mobility measurements. An anomalous light emission behavior is observed in unipolar OLETs. The phenomenon is discussed in light of the effects of electron injection and outcoupling efficiency, respectively. Our results show that the multifunctional electrodes are useful for implementing highly efficient unipolar OLETs.

    DOI: 10.1063/1.3109800

  • Efficient Deep-Blue Organic Light-Emitting Diodes Based on 9,9-Bis(4-biphenylyl)fluorene Derivatives 査読

    Naoki Matsumoto, Takanori Miyazaki, Masakazu Nishiyama, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   113 ( 15 )   6261 - 6266   2009年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We fabricated highly efficient deep-blue organic light-emitting diodes (OLEDs) composed of 2,7-bis(4'-diphenylamino-1,1'-biphenyl-4-yl)-9,9-bis(1,1'-biphenyl-4-yl)-9H-fluorene (FLBD) as an emitter doped into a wider energy gap host of 2,7-bis(1,1'-biphenyl-4-yl)-9,9-bis(1,1'-biphenyl-4-yl)-9H-fluorene (FLBH). We investigated the dominant factors for external electroluminescence quantum efficiency (eta(ext)) in the deep-blue OLEDs by focusing on the carrier balance in the en-fitting layer (EML), the location and width of the carrier recombination zone, and carrier-induced exciton quenching. The eta(ext) value of the OLEDs strongly depended on the hole injection efficiency from a hole transport layer (HTL) to the EML. By controlling the hole injection barrier into the EML and balancing the number of electrons and holes in the EML using HTLs having various highest occupied molecular orbital levels, we obtained the highest eta(ext) of 5.4&#37; with deep-blue Commission International De L'Eclairage coordinates of x = 0. 15 and y = 0.09. Additionally, we found that the width of the carrier recombination zone tightly correlates to the hole injection efficiency into the EML.

    DOI: 10.1021/jp809024h

  • Effect of solvent on fabrication of active layers in organic solar cells based on poly(3-hexylthiophene) and fullerene derivatives 査読

    Kenji Kawano, Jun Sakai, Masayuki Yahiro, Chihaya Adachi

    SOLAR ENERGY MATERIALS AND SOLAR CELLS   93 ( 4 )   514 - 518   2009年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Investigating the effect of solvent on the fabrication of photo-active layers in bulk heterojunction organic solar cells based on poly(3-hexylthiophene) and [6,6]-phenyl C(61)-butyric acid methyl ester, we found the short-circuit current density (J(SC)) and fill factor (FF) of a cell with a photo-active layer made using materials dissolved in a mixture of o-dichlorobenzene with chloroform to be slightly higher than those of a cell made using the same materials dissolved only in chlorobenzene. Evaluating the absorption spectra, surface morphology, charge mobility, and solubility of photo-active films made using different solvents, we concluded that the higher J(SC) and FF were due to a larger interfacial area between the photo-active materials in the layer. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.solmat.2008.11.003

  • Efffect of solvent on fabrication of active layers in organic solar cells based on poly(3-hexylthiophene)and fullerene derivatives 国際誌

    Kenji kawano,Jun Sakai,Masyuki Yahiro,Chihaya Adachi

    Sol.Energy Mater.Sol.Cells.   2009年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • High efficiency blue light emitting unipolar transistor incorporating multifunctional electrodes

    Tung-Huei Ke,Robert Gehlhaar,Chih-Hsin Chen,Jiann-T'suen Lin,Chung-Chih Wu,Chihaya Adachi

    Appl.Phys.Lett..   ( 94 )   2009年4月

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    記述言語:英語  

  • Nanoparticles of adaptive supramolecular networks self-assembled from nucleotides and lanthanide irons 国際誌

    R.Nishiyabu,N.Hashimoto,T.Cho,K.Watanabe,T.Yasunaga,A.Endo,K.Kaneko,T.Niidome,M.Murata,C.Adachi,Y.Katayama,M.Hashizume,N.Kimuzuka

    J.Am.Chem.Soc..   ( 131 )   2009年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Nanoparticles of Adaptive Supramolecular Networks Self-Assembled from Nucleotides and Lanthanide Ions 査読

    Ryuhei Nishiyabu, Nozomi Hashimoto, Ten Cho, Kazuto Watanabe, Takefumi Yasunaga, Ayataka Endo, Kenji Kaneko, Takuro Niidome, Masaharu Murata, Chihaya Adachi, Yoshiki Katayama, Makoto Hashizume, Nobuo Kimizuka

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   131 ( 6 )   2151 - 2158   2009年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Amorphous nanoparticles of supramolecular coordination polymer networks are spontaneously self-assembled from nucleotides and lanthanide ions in water. They show intrinsic functions such as energy transfer from nucleobase to lanthanide ions and excellent performance as contrast enhancing agents for magnetic resonance imaging (MRI). Furthermore, adaptive inclusion properties are observed in the self-assembly process: functional materials such as fluorescent dyes, metal nanoparticles, and proteins are facilely encapsulated. Dyes in these nanoparticles fluoresce in high quantum yields with a single exponential decay, indicating that guest molecules are monomerically wrapped in the network. Gold nanoparticles and ferritin were also wrapped by the supramolecular shells. In addition, these nucleotide/lanthanide nanoparticles also serve as scaffolds for immobilizing enzymes. The adaptive nature of present supramolecular nanoparticles provides a versatile platform that can be utilized in a variety of applications ranging from material to biomedical sciences. As examples, biocompatibility and liver-directing characteristics in in vivo tissue localization experiments are demonstrated.

    DOI: 10.1021/ja8058843

  • Horizontal orientation of linear-shaped organic molecules having bulky substituents in near and doped vacuum-deposited amorphous films 国際誌

    Daisuke Yokoyama,Akio Sakaguchi,MIchio Suzuki,Chihaya Adachi

    Org.Electron..   2009年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Horizontal orientation of linear-shaped organic molecules having bulky substituents in neat and doped vacuum-deposited amorphous films 査読

    Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi

    ORGANIC ELECTRONICS   10 ( 1 )   127 - 137   2009年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic amorphous films fabricated by vacuum deposition have been widely used in organic light-emitting devices, making use of their high-performance optical and electrical characteristics and taking advantage of the easy fabrication of pinhole-free thin smooth layers of a desired thickness. However, random orientation in amorphous films often makes it difficult to utilize their best optical and electrical potential. Here the authors demonstrate that the linear-shaped molecules of fluorescent styrylbenzene derivatives are horizontally oriented in organic amorphous films fabricated by conventional vacuum deposition even when the molecules are doped in an isotropic host matrix film. The longer the molecular length is, the larger the anisotropy of the molecular orientation becomes. The weak interaction between adjacent molecules and the linear-shaped molecular structure probably cause the horizontal orientation. The fact that the horizontal molecular orientation occurs on any underlying layers shows the high versatility of the horizontal orientation for various applications. Their findings will provide a new guideline for molecular designs that can be used to improve optical and electrical characteristics of organic optoelectronic devices, such as organic light-emitting diodes and organic laser devices. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.orgel.2008.10.010

  • Low threshold blue emission from first-order organic DFB laser using 2,7-bis[4-(N-carbazole)phenylvinyl]-9,9`-spirobifluorene as active gain medium 国際誌

    Masaya Hirade,Hajime Nakanotani ,Reiji Hattori,Akihiro Ikeda,Masayuki Yahiro,Chihaya Adachi

    Mol.Cryst.Liq.Cryst   ( 504 )   2009年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Charge separation and transport behavior of a two-dimensional charge sheet at organic donor-acceptor heterointerface 国際誌

    Tomo Sakanoue,Toru Irie,Chihaya Adachi

    J.Appl.Phys..   ( 105 )   2009年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Thermally Activated Delayed Fluorescence (TADF) from Sn4(+)-porphyrin Complexes and Their Application to Organic Light Emitting Diodes - Novel Pathway for High Efficiency Electroluminescence 査読

    Ayataka Endo, Mai Ogasawara, Atsushi Takahashi, Yoshimine Kato, Chihaya Adachi

    28TH INTERNATIONAL DISPLAY RESEARCH CONFERENCE   23 - 25   2008年12月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We developed six Sn4(+)-porphyrin complexes showing thermally activated delayed fluorescence (TADF). The TADF intensities were increased with an increase of temperature owing to acceleration of the reverse intersystem crossing from triplet to singlet excited states by heat activation. Further, we demonstrate TADF under electrical excitation. We believe that TADF will provide novel light-emitting mechanism which significantly enhances electroluminescence quantum efficiency.

  • Enhancing hole transports and generating hole traps by doping organic hole-transport layers with p-type molecules of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane 査読

    Toshinori Matsushima, Chihaya Adachi

    THIN SOLID FILMS   517 ( 2 )   874 - 877   2008年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We investigated the relationship between the hole-transport and hole-trap characteristics of N,N'-diphenyl-N,N'-bis(1-naphthyl)-1,1'-biphenyl-4,4'-diamine (alpha-NPD) doped with p-type molecules of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F(4)-TCNQ) at various concentrations. The results of our current density-voltage, field-effect transistor, and thermally stimulated current studies revealed that the current densities of hole-only alpha-NPD devices at a certain driving voltage increased in the F(4)-TCNQ concentration region between 0 mol&#37; and 3 mol&#37; due to the generation of free holes while the hole mobilities of the alpha-NPD layers decreased due to an increase in hole-trap concentration and deepened hole-trap energy levels, which were caused by the F(4)-TCNQ doping. The optimized doping concentration of F(4)-TCNQ was 3 mol&#37;, which provided the highest current density for the hole-only device. On the other hand, since the increase in free-hole concentration was overcome by the decrease in hole mobility, the current density of the hole-only device decreased at the F(4)-TCNQ concentration of 4 mol&#37; when compared with the optimized concentration. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2008.07.008

  • Organic light emitting devices from OLED to organic laser diode 査読

    Chihaya Adachi, Toshinori Matsushima, Hajime Nakanotani, Daisuke Yokoyama, Masayuki Yahiro

    AOE 2007: ASIA OPTICAL FIBER COMMUNICATION & OPTOELECTRONIC EXPOSITION & CONFERENCE, CONFERENCE PROCEEDINGS   189 - +   2008年10月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We mention some significant progresses on organic light emitting diode (OLED), organic laser diode (OLD) and organic field effect transistor (OFET). We discuss prospect of OLD based on recent developments of organic light emitting devices.

    DOI: 10.1109/AOE.2007.4410748

  • Horizontal molecular orientation in vacuum-deposited organic amorphous films of hole and electron transport materials 査読

    Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, Chihaya Adachi

    APPLIED PHYSICS LETTERS   93 ( 17 )   2008年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Using wide-range variable angle spectroscopic ellipsometry, the authors demonstrate large optical uniaxial anisotropy of vacuum-deposited organic amorphous films of hole and electron transport materials having long or planar molecular structures. The ordinary refractive indices and extinction coefficients were higher than the extraordinary ones, revealing that the molecules in the amorphous films are horizontally oriented. The horizontal orientation requires significant modifications in the understanding of both the electrical and optical characteristics of amorphous films when we use materials having long or planar molecular structures. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2996258]

    DOI: 10.1063/1.2996258

  • Low driving voltage organic light emitting diode using phenanthrene oligomers as electron transport layer 査読

    Hsiao-Wen Hung, Norimasa Yokoyama, Masayuki Yahiro, Chihaya Adachi

    THIN SOLID FILMS   516 ( 23 )   8717 - 8720   2008年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate that an electron transport material, 2-(phenanthren-10-yl)-7-(phenanthren-9-yl)phenanthrene (Phen-A), significantly lowers the driving voltage in organic light emitting diodes. In a device structure of indium tin oxides (110 nm)/N,N'-di(alpha-naphtyl)-N,N'-diphenyl-benzidine (50 nm)/tris-(8-hydroxy quinoline)aluminum (20 nm)/Phen-A (30 nm)/MgAg(100 nm)/Ag (10 nm), a very low driving voltage of 5.8 V was obtained at a current density of 100 mA/cm(2). We clarified that Phen-A has a preferred the lowest unoccupied molecular orbital level and a characteristic polycrystalline texture, which are ascribed to the reason for the improved electron injection efficiency at the Phen-A/cathode interface. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2008.05.047

  • Photosensitizing properties of the porphycene immobilized in sol-gel derived silica coating films 査読

    Hisashi Shimakoshi, Tatsushi Baba, Yusuke Iseki, Ayataka Endo, Chihaya Adachi, Midori Watanabe, Yoshio Hisaeda

    TETRAHEDRON LETTERS   49 ( 43 )   6198 - 6201   2008年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Porphycene was covalently immobilized in a sol-gel silica film deposited on a glass plate, and the immobilized porphycene showed a photosensitizing property with recycling for the photo-oxidation of 1,5-dihydroxynaphthalene. (C) 2008 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.tetlet.2008.08.003

  • Blue-light-emitting ambipolar field-effect transistors using an organic single crystal of 1,4-Bis(4-methylstyryl)benzene 査読

    Hajime Nakanotani, Ryota Kabe, Masayuki Yahiro, Taishi Takenobu, Yoshihiro Iwasa, Chihaya Adachi

    APPLIED PHYSICS EXPRESS   1 ( 9 )   2008年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    An ambipolar light-emitting organic field-effect transistor (LE-OFET) based on a 1,4-Bis(4-methylstyryl)benzene (BSB-Me) single crystal was developed. The BSB-Me single crystal has very high photoluminescence quantum efficiency (phi(PL)) of 89 +/- 2&#37;, while phi(PL) of the BSB-Me vapor-deposited film is limited to a much lower value of 54 +/- 2&#37;. Ambipolar operation with successive blue electroluminescence from the FETs based on the BSB-Me single crystals was demonstrated by realizing nearly equal electron and hole mobilities [about 0.005 cm(2)/(V s)] with asymmetric gold-calcium contacts. Since BSB-Me single crystals can perform light amplification, the BSIB-Me-based ambipolar LE-OFET is a promising candidate for future electrically driven organic blue-emitting solid-state lasers. (C) 2008 The Japan Society of Applied Physics.

    DOI: 10.1143/APEX.1.091801

  • Roll-off characteristics of electroluminescence efficiency of organic blue electrophosphorescence diodes 査読

    Kyung Soo Son, Masayuki Yariro, Toshiro Imai, Hiroki Yoshizaki, Junichi Nishide, Hiroyuki Sasabe, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 9 )   7363 - 7365   2008年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We studied the relaxation of electroluminescence roll-off characteristics by changing the dopant concentration and thickness of the emitting layer in organic blue electrophosphorescence diodes composed of 2,6-dicarbozolo-1.5-pyridine host doped with iridium(III)-bis[(4,6-di-fluorophenyl)-pyridinato-NC(2)]picolinate. Analyzing the roll-off characteristics using the theoretical models of triplet-triplet annihilation and triplet-polaron annihilation (TPA). We found that the roll-off characteristics of these devices were determined primarily by TPA.

    DOI: 10.1143/JJAP.47.7363

  • FDTD simulations of external light out-coupling efficiency of organic field-effect transistors 査読

    Robert Gehlhaar, Masayuki Yahiro, Chihaya Adachi

    ORGANIC LIGHT EMITTING MATERIALS AND DEVICES XII   7051   2008年8月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We report on three-dimensional numerical optical simulations of the emission extraction efficiency in light emitting devices with field effect carrier transport. The finite difference time domain (FDTD) method is applied for organic thin film structures on silicon substrates with metal and metal oxide electrodes. Simulations are performed for An, Ag and indium tin oxide electrodes in bottom gate, bottom contact geometries. Special attention is paid on the dependence on electrode thickness and contact shape. It is demonstrated that in unipolar driven devices with Si gate, silicon dioxide insulator and 40 inn-thick organic films the maximum out-coupling efficiency is below 10&#37;. This value can be doubled by an implementation of metal reflecting layers on the Si substrate. Furthermore, the emission efficiency in the ambipolar regime is investigated. The results present the dependence of light extraction on the distance between light, source and electrode. Additionally, the influence of the contact edge shape is investigated for two different designs with rectangular and wedge electrodes. Interference effects cause an oscillation in the distance dependence.

    DOI: 10.1117/12.793569

  • Spectrally narrow emissions at cutoff wavelength from edges of optically and electrically pumped anisotropic organic films (vol 103, artn 123104, 2008) 査読

    Daisuke Yokoyama, Masato Moriwake, Chihaya Adachi

    JOURNAL OF APPLIED PHYSICS   104 ( 3 )   2008年8月

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    記述言語:英語  

    DOI: 10.1063/1.2976164

  • 22aTB-4 Unique Optoelectronic Properties of Organic Single-Crystal Ambipolar Light-Emitting Transistors 査読

    Bisri Satria Zulkarnaen, Takenobu Taishi, Tsuda Satoshi, Hotta Shu, Adachi Chihaya, Iwasa Yoshihiro

    日本物理学会講演概要集   63 ( 0 )   759 - 759   2008年8月

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    記述言語:英語  

    22aTB-4 Unique Optoelectronic Properties of Organic Single-Crystal Ambipolar Light-Emitting Transistors

    DOI: 10.11316/jpsgaiyo.63.2.4.0_759_1

  • Finite difference time domain analysis of the light extraction efficiency in organic light-emitting field-effect transistors 査読

    Robert Gehlhaar, Masayuki Yahiro, Chihaya Adachi

    JOURNAL OF APPLIED PHYSICS   104 ( 3 )   2008年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors report on three-dimensional numerical optical simulations of the emission outcoupling efficiency in light-emitting devices with a field-effect carrier transport. The finite difference time domain method is applied to organic thin film structures on a silicon substrate with metal and metal oxide electrodes. Simulations are performed for Au, Ag, and indium tin oxide electrodes in a bottom gate, bottom contact geometry. Additional attention is paid to the dependence on electrode thickness and contact shape. We demonstrate that in unipolar driven devices with Si gate, silicon dioxide insulator, and 40 nm thick organic films, the maximum outcoupling efficiency is below 10&#37;. This value can be increased by the implementation of a metal reflecting layer on the Si substrate. In further studies, the emission efficiency in the ambipolar regime is investigated. The result presents the dependence of light extraction on the light source-electrode distance for rectangular and wedge shaped contacts. (C) 2008 American Institute of Physics.

    DOI: 10.1063/1.2968132

  • Measurement of photoluminescence efficiency of Ir(III) phenylpyridine derivatives in solution and solid-state films 査読

    Ayataka Endo, Kengo Suzuki, Toshitada Yoshihara, Seiji Tobita, Masayuki Yahiro, Chihaya Adachi

    CHEMICAL PHYSICS LETTERS   460 ( 1-3 )   155 - 157   2008年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We compared the photoluminescence efficiency (Phi(PL)) of fac-tris(2-phenylpyridine) iridium (Ir(ppy)(3)) and derivatives of it in solution and in doped solid-state films and estimated their radiative and nonradiative decay rates. The green phosphor of Ir(ppy)(3) and blue phosphors of FIrpic, Ir(Fppy)(3), FIr6 showed high Phi(PL) values approaching to 100&#37; in both solution and doped solid-state films. On the other hand, the red phosphor of Btp(2)Ir(acac) showed lower Phi(PL) value less than 40&#37; in both environments. Photoacoustic spectroscopy results indicated that for Btp(2)Ir(acac) nonradiative decay from the triplet state to the ground states is 64 +/- 8&#37;. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2008.05.064

  • Analyzing bipolar carrier transport characteristics of diarylamino-substituted heterocyclic compounds in organic light-emitting diodes by probing electroluminescence spectra 査読

    Kyung Soo Son, Masayuki Yahiro, Toshiro Imai, Hiroki Yoshizaki, Chihaya Adachi

    CHEMISTRY OF MATERIALS   20 ( 13 )   4439 - 4446   2008年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We analyzed bipolar carrier transport characteristics of diarylamino-substituted heterocyclic compounds (DAHCs) having benzene, pyridine, pyrimidine, or triazine electron-accepting core units and carbazole or beta-naphthylamine as electron-donating substituents. The highest occupied molecular and lowest unoccupied molecular orbital levels, carrier injection, and transport characteristics were systematically controlled by changing combinations of the core and substituent units. By analyzing electroluminescence spectra as a probe in four kinds of organic light emitting diode (OLED) structures, we found that the carrier transport characteristics of DAHCs significantly change depending on device structure. We concluded that all DAHCs have bipolar carrier transport characteristics, that is, DAHCs intrinsically possess both hole and electron mobilities that are based on unique molecular structures having both electron -donating and -accepting units. We also demonstrated that carrier injection barriers between DAHCs and adjacent carrier transport layers virtually control the appearance of bipolar characteristics in OLEDs.

    DOI: 10.1021/cm8004985

  • Temperature-independent electron tunneling injection in tris (8-hydroxyquinoline) aluminum thin film from high-work-function gold electrode 査読

    Toshinori Matsushima, Chihaya Adachi

    THIN SOLID FILMS   516 ( 15 )   5069 - 5074   2008年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We fabricated electron-only tris (8-hydroxyquinoline) aluminum (Alq(3)) single-layer devices with a device structure of glass substrate/MgAg anode (100 nm)/Alq(3) layer (100 nm)/metal cathode (100 nm), and systematically varied the work functions (WF) of the metal cathodes from WF=-1.9 (Cs) to -2.9 (Ca), -3.8 (Mg), -4.4 (Al), -4.6 (Ag), and -5.2 eV (Au) to investigate how electron injection barriers at the cathode/Alq(3) interfaces influence their current density-voltage (J-V) characteristics. We found that current densities at a certain driving voltage decrease and the temperature dependence of J-V characteristics of the devices gradually becomes weaker as the work functions of the metal cathodes are decreased. The device with the highest-work-function Au cathode exhibited virtually temperature-independent J-V characteristics, suggesting that a current flow mechanism of this device is mainly controlled by electron tunneling injection at the Au/Alq(3) interface. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2008.02.012

  • Temperature-independent current density voltage characteristics in tris(8-hydroxyquinoline)aluminum thin films 査読 国際誌

    Toshinori Matsushima and Chihaya Adachi

    Thin Solid Films   2008年6月

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    記述言語:英語  

  • Spectrally narrow emissions at cutoff wavelength from edges of optically and electrically pumped anisotropic organic films 査読

    Daisuke Yokoyama, Masato Moriwake, Chihaya Adachi

    JOURNAL OF APPLIED PHYSICS   103 ( 12 )   2008年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors investigated the characteristics of spectrally narrow emissions at the cutoff wavelength from the edges of optically and electrically pumped organic semiconductor films. They estimated the optical properties of 4,4(')-bis[(N-carbazole)styryl]biphenyl (BSB-Cz) films using variable angle spectroscopic ellipsometry, revealing that the BSB-Cz films have uniaxial anisotropy and that BSB-Cz molecules lie nearly parallel to substrate surfaces. The authors discuss here the spectral changes in the edge emissions from neat BSB-Cz and tris(8-hydroxyquinoline)aluminum (Alq(3)) films of 15 different thicknesses under continuous-wave (cw) optical excitation. The spectrally narrow emissions of transverse electric (TE) and transverse magnetic (TM) modes were observed. The authors showed that the peak wavelengths of these emissions varied according to the cutoff wavelengths of asymmetric slab waveguides and that their spectral widths changed depending on the angular dispersion of the Fabry-Perot interferometer composed of the organic film and its interfaces. The edge emissions from the BSB-Cz films had narrower bands than those from the Alq(3) films and increased with a superlinear dependence on the stripe length of the excitation area, indicating the occurrence of light amplification under cw optical excitation. Finally, the authors demonstrate spectrally narrow emissions from the edges of electrically pumped organic light-emitting diodes (OLEDs) having a fine line-shaped waveguide structure with a silver metal cladding layer. Narrow emissions of TE mode were observed, and the peak wavelengths of the emission spectra corresponded well to the cutoff wavelength of the waveguide with the silver cladding layer. In addition to the narrow emissions, the authors observed some intriguing phenomena suggestive of the occurrence of light amplification in OLEDs under electrical pumping. (C) 2008 American Institute of Physics.

    DOI: 10.1063/1.2942401

  • Invited paper: Molecular design of organic semiconductors aiming for high performance OLED, OFET and organic laser diode 査読

    Chihaya Adachi

    2008 SID INTERNATIONAL SYMPOSIUM, DIGEST OF TECHNICAL PAPERS, VOL XXXIX, BOOKS I-III   39   604 - 608   2008年5月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We report recent progresses on organic light emitting devices such as organic light emitting diode (OLED), light-emitting organic field effect transistor (LE-OFET) and organic laser diode (OLD). We demonstrate very low driving voltage of OLEDs using a p-i-n structure which also provides high current carrier injection over kA/cm(2). Further we demonstrate novel organic devices such as light emitting FET. We also discuss future prospect of OLD based on our recent materials' development and analysis of operation mechanism.

  • Exciplex formations between tris(8-hydoxyquinolate)aluminum and hole transport materials and their photoluminescence and electroluminescence characteristics 査読

    Naoki Matsumoto, Masakazu Nishiyarna, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   112 ( 20 )   7735 - 7741   2008年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We investigated exciplex formations between tris(8-hydoxyquinolate)aluminum (Alq(3)) and hole transport materials (HTMs) that have various highest occupied molecular orbital (HOMO) levels (-6.0 to -5.1 eV). The investigation focused on the photoluminescence and electroluminescence characteristics of Alq(3):HTM codeposited films. Intermolecular interaction between Alq3 and the HTMs correlated with the HOMO levels of the HTMs. In the HTMs with HOMO levels ranging between -5.3 and -5.1 eV, the exciplex formation was clearly observed. No appreciable exciplex formation was observed in the HTMs with HOMO levels between -6.0 and -5.4 eV. The HTMs with -5.5 and -5.4 eV of HOMO levels, which are in an equivocal gray zone, showed weak intermolecular interaction, leading to a slight decrease in Alq(3) fluorescence efficiency without a significant spectral shift. The quenching of Alq(3) fluorescence by such weak intermolecular interaction was signaled by an external electric field. We observed that this type of weak exciplex formation also affected the electroluminescence quantum efficiency of HTM/Alq(3)-based organic light emitting diodes (OLEDs); therefore, it is necessary to control this delicate interface interaction to maximize OLED performance.

    DOI: 10.1021/jp800443r

  • Material design of organic semiconductors for light emitting organic field-effect transistors and their device characteristics 査読

    Masayuki Yahiro, Tomo Sakanouel, Hiroyuki Uchiuzou, Takahito Oyamada, Akio Toshimitsu, Chihaya Adachi

    JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN   66 ( 5 )   493 - 503   2008年5月

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    記述言語:日本語  

    In this study, we report on material design of light-emitting organic field effect transistors (LE-OFETs). Some of newly synthesized pyrene and bis-styryl derivatives as an active layer demonstrated high field effect mobility (mu(h) = 0.11 cm(2)/VS, C 6-BSBP) and high photoluminescence efficiency (phi(PL)similar to 80&#37;, symmetrical di-substituted pyrene derivatives). Further, external electroluminescence quantum efficiency was improved from 0.01&#37; in TPPy to 0.15 similar to 0.54&#37; in pyrene dimmers. In addition, we demonstrate an increase of EL efficiency by introducing guest-host system and ambipolar operation mechanism.

    DOI: 10.5059/yukigoseikyokaishi.66.493

  • Fabrication of ambipolar light-emitting transistor using high-photoluminescent organic single crystal 査読

    Bisri Satria Zulkarnaen, Takenobu Taishi, Yomogida Yohei, Yamao Takeshi, Yahiro Masayuki, Hotta Shu, Adachi Chihaya, Iwasa Yoshihiro

    ORGANIC OPTOELECTRONICS AND PHOTONICS III   6999   2008年5月

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    記述言語:その他   掲載種別:研究論文(その他学術会議資料等)  

    Fabrication of ambipolar light-emitting transistor using high-photoluminescent organic single crystal
    Organic single-crystal ambipolar light-emitting transistors show a great interest due to their unique features, spectral matching with their active material spectra and the quantum efficiency preservation during ambipolar operation at high current density operation in kA/cm2 order. The development of ambipolar light emitting transistor based on high photoluminescent material, α,ω-bis(biphenylyl)terthiophene (BP3T) single crystal is reported. By using bottom-gated top-contact configuration, with Ca and Au opposed metal electrodes, high value of hole and electron mobility were obtained. Extremely bright light emission observed during ambipolar operation shows prospect for electrically driven amplified spontaneous emission from organic materials.

    DOI: 10.1117/12.781126

  • Highly efficient organic light-emitting diodes doped with thiophene/phenylene co-oligomer 査読

    Toshinori Matsushima, Chihaya Adachi

    CHEMISTRY OF MATERIALS   20 ( 9 )   2881 - 2883   2008年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/cm80009817

  • Electrical characteristics of single-component ambipolar organic field-effect transistors and effects of air exposure on them 査読

    Tomo Sakanoue, Masayuki Yahiro, Chihaya Adachi, Kazuo Takimiya, Akio Toshimitsu

    JOURNAL OF APPLIED PHYSICS   103 ( 9 )   2008年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We investigated the electrical characteristics of single-component ambipolar organic field-effect transistors (OFETs) by controlling the device structure and preparation and the measurement conditions. Six organic semiconductor materials (copper-phthalocyanine, tris-(8-hydroxyquinoline)aluminum (Alq(3)), alpha-sexithiophene, 4-4'-bis-styrylphenyl, 2,7-diphenyl[1]benzothieno[3,2-b]benzothiophene, or a photopolymerized polydiacethylene derivative (PDA) were used as the active layer, and all were found to transport both holes and electrons. The PDA-based FETs had the highest hole and electron mobilities (0.12 and 0.025 cm(2)/V s, respectively). We also investigated the effect of air exposure on the OFETs. The hole mobility was barely affected by the exposure while the electron mobility was significantly affected. The threshold voltage for p-channel operation was shifted by the exposure while that for n-channel operation was not, indicating that the hole density in the active layer is increased by air exposure whereas the electron density is independent of air exposure. Furthermore, we prepared an Alq(3)-based p-channel OFET and investigated the effect of air exposure on it. While its operation was stable in vacuum, air exposure degraded its characteristics. These behaviors indicate that irreversible chemical reactions occur between cationic Alq(3) species and oxygen or water molecules. (C) 2008 American Institute of Physics.

    DOI: 10.1063/1.2919738

  • Photophysical and Photosensitizing properties of brominated porphycenes 査読

    Hisashi Shimakoshi, Tatsushi Baba, Yusuke Iseki, Isao Aritome, Ayataka Endo, Chihaya Adachi and Yoshio Hisaeda

    Chem.Comm.   2008年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Electrical Properties of 1,4-bis(4-(phenylethynyl)Phenylethynyl)Benzene and its Application for Organic Light Emitting Diodes

    Larysa Fenenko, Guang Shao, Akihiro Orita, Masayuki Yahiro, Funzo Otera, Sergei Svechnikov, and Chihaya Adachi

    Chem.Commin   2008年4月

  • Bright electroluminescence from single-layer organic light-emitting diodes comprising an ambipolar carrier transport layer of phenyldipyrenylphosphine oxide 査読

    Toshinori Matsushima, Chihaya Adachi

    THIN SOLID FILMS   516 ( 12 )   4288 - 4292   2008年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We investigated the carrier transport and recombination characteristics of single-layer organic light-emitting diodes (SLOLEDs) composed of a phenyldipyrenylphosphine oxide (POPy2) layer doped with orange fluorescent molecules of 2,5-bis-[bis-(4-methoxy-phenyl)-amino}-styryl]-terephthalonitrile (BST). The SLOLEDs achieved a high external quantum efficiency of 1.6&#37; and a high luminance of 24,000 cd/m(2) at a low driving voltage of 8 V These very good electrolummescence characteristics originate from factors that include our use of the following: (1) the ambipolar POPy2 layer, which can transport balanced amounts of electrons and holes, (2) a high BST-doping concentration that traps injected carriers on BST molecules, and (3) insertion of an undoped POPy2 layer next to a metallic cathode to prevent exciton quenching. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2007.09.038

  • Exciplex formation between Alq3 and hole transport materials and their photo-and electroluminescence characteristics 査読 国際誌

    Naoki Matsumoto, Masakazu Nishiyama, Chihaya Adachi

    J.Phys.Chem.C.   2008年4月

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    記述言語:英語  

  • Photophysical and photocatalytic properties of beta-sulfonatoporphycenes 査読

    Tatsushi Baba, Hisashi Shimakoshi, Ayataka Endo, Chihaya Adachi, Yoshio Hisaeda

    CHEMISTRY LETTERS   37 ( 3 )   264 - 265   2008年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The photophysical properties and photooxidation ability of the beta-sulfonatoporphycenes are reported. The photophysical parameters depend on the number of substitutions. The disulfonated porphycene 2 is expected to be a new photosensitizer due to its high catalytic activity and photostability.

    DOI: 10.1246/cl.2008.264

  • Evaluating origin of electron traps in tris(8-hydroxyquinoline) aluminum thin films using thermally stimulated current technique 査読

    Toshinori Matsushima, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 3 )   1748 - 1752   2008年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We measured the energy distributions and concentrations of electron traps in O(2)-unexposed and O(2)-exposed tris(8-hydroxyquinoline) aluminum (Alq(3)) films using a thermally stimulated current (TSC) technique to investigate how doping O(2) molecules in Alq(3) films affect the films' electron trap and electron transport characteristics. The results of our TSC studies revealed that Alq(3) films have an electron trap distribution with peak depths ranging from 0.075 to 0.1 eV and peak widths ranging from 0.06 and 0.07 eV. Exposing the Alq3 films to O(2) atmosphere induced a marked increase in electron trap concentration, indicating that electron traps with an energy distribution originate from O(2) molecules absorbed in Alq(3) films. We measured the current density-voltage characteristics of these films. The driving and turn-on voltages of the O(2)-exposed Alq(3) film became higher than those of the O(2)-unexposed Alq(3) film owing to the increase in electron trap concentration caused by the O(2) doping of the Alq(3) films.

    DOI: 10.1143/JJAP.47.1748

  • 発光性有機トランジスタ用材料の分子設計とデバイス特性

    八尋 正幸、坂上 知、内生蔵 広幸、小山田 崇人、年光 昭夫、安達 千波矢

    有機合成化学協会誌   2008年2月

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    記述言語:日本語   掲載種別:研究論文(大学,研究機関等紀要)  

  • High current density in light-emitting transistors of organic single crystals 査読

    Taishi Takenobu, Satria Zulkarnaen Bisri, Tetsuo Takahashi, Masayuki Yahiro, Chihaya Adachi, Yoshihiro Iwasa

    PHYSICAL REVIEW LETTERS   100 ( 6 )   066601   2008年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We measured the external electroluminescence quantum efficiency (eta(ext)) in light-emitting field-effect transistors (LETs) made of organic single crystals and found that, in the ambipolar transport region, eta(ext) is not degraded up to several hundreds A/cm(2) current-density range, which is 2 orders of magnitude larger than that achieved in conventional organic light-emitting diodes. The present result indicates the single-crystal organic LET is a promising device structure that is free from various kinds of nonradiative losses such as exciton dissociation near electrodes and exciton annihilations.

    DOI: 10.1103/PhysRevLett.100.066601

  • Enhanced hole injection and transport in molybdenum-dioxide-doped organic hole-transporting layers 査読

    Toshinori Matsushima, Chihaya Adachi

    JOURNAL OF APPLIED PHYSICS   103 ( 3 )   2008年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We have found that molybdenum dioxide (MoO(2)) is an excellent dopant for enhancing electrical conductivities in organic hole-transporting layers. We fabricated hole-only devices with an alpha-sexithiophene (alpha-6T) layer doped with MoO(2) at various concentrations to investigate how doping MoO(2) into the alpha-6T layers influences the hole-injection and hole-transport characteristics of these layers. We observed a marked increase in electrical conductivity as a result of the MoO(2) doping. The 30-mol &#37; MoO(2)-doped alpha-6T layer had a high electrical conductivity of 8.9 +/- 1.3x10(-6) S/cm. From the results of our visible/near-infrared absorption spectra study of these doped layers, we confirmed that this increase in electrical conductivity is caused by a charge transfer between MoO(2) and alpha-6T, which leads to an increase in free hole concentration in the doped layers and the formation of an ohmic contact at an electrode/alpha-6T interface. In the latter part of this paper, we discuss current flow and electroluminescence (EL) characteristics of organic light-emitting diodes (OLEDs) with a 30-mol &#37; MoO(2)-doped alpha-6T hole-transporting layer and a 30-mol &#37; Cs-doped phenyldipyrenylphosphine oxide (POPy(2)) electron-transporting layer. We achieved an extremely low driving voltage of 3.1 V required for a current density of 100 mA/cm(2) in the doped OLEDs owing to the use of the alpha-6T and POPy(2) layers with high carrier mobilities and the excellent p-type MoO(2) and n-type Cs dopants. We demonstrated the enhancement of power efficiencies by approximate to 2 times in the doped OLEDs compared with undoped OLEDs and observed bright EL at low driving voltages in the doped OLEDs, for example, 100 cd/m(2) at 2.3 V, 1000 cd/m(2) at 2.7 V, and 10 000 cd/m(2) at 3.3 V. (c) 2008 American Institute of Physics.

    DOI: 10.1063/1.2836972

  • Alignment-free process for asymmetric contact electrodes and their application in light-emitting organic field-effect transistors 査読

    Tomo Sakanoue, Masayuki Yahiro, Chihaya Adachi, Jeremy H. Burroughes, Yoshiaki Oku, Noriyuki Shimoji, Takayoshi Takahashi, Akio Toshimitsu

    APPLIED PHYSICS LETTERS   92 ( 5 )   2008年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We developed an alignment-free process for asymmetric contacts of Au and Al and applied it to light-emitting organic field-effect transistors. Because electrons were injected efficiently from Al contacts, the emission intensity and onset voltages for light were significantly better than those in a device with conventional Au/Cr contacts. Moreover, a device with 1 mu m channel length asymmetric contacts of Au and Al showed about 50 times higher current than that of the device with conventional Au/Cr contacts. This significant improvement can be ascribed to both dual space-charge formation of holes and electrons and low carrier injection barriers. (c) 2008 American Institute of Physics.

    DOI: 10.1063/1.2839895

  • Suppression of exciton annihilation at high current densities in organic light-emittingdiode resulting from energy-level alignments of carrier transport layers 査読 国際誌

    Toshinori Matsushima and Chihaya Adachi

    Appl.Phys. Lett.   2008年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Ambipolar Tetraphenylpyrene (TPPy) Single-Crystal Field-Effect Transistor with Symmetric and Asymmetric Electrodes 査読

    S. Z. Bisri, T. Takahashi, T. Takenobu, M. Yahiro, C. Adachi, Y. Iwasa

    FRONTIERS IN MATERIALS RESEARCH   10   103 - +   2008年1月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    An ambipolar field-effect transistor (FET) based on a 1,3,6,8- tetraphenylpyrene (TPPy) single-crystal, a high photoluminescent material, has been successfully fabricated using symmetric and asymmetric electrodes. Several kinds of metal electrodes have been employed to investigate the charge injection characteristics in the single-crystal FET. Hole and electron mobilities of 0.34 and 7.7x10(-2) cm(2) V-1 s(-1) were achieved by using Au and Ca electrodes, respectively. The ambipolar characteristic of this device gives a prospect for further development in light-emitting FIST operation.

  • A high mobility ambipolar field effect transistor using a 2,6-diphenylbenzo[1,2-b : 4,5-b']diselenophene/fullerene double layer 査読

    Kinoshita Shohei, Sakanoue Tomo, Yahiro Masayuki, Takimiya Kazuo, Ebata Hideaki, Ikeda Masaaki, Kuwabara Hirokazu, Adachi Chihaya

    SOLID STATE COMMUNICATIONS   145 ( 3 )   114 - 117   2008年1月

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    記述言語:その他  

    A high mobility ambipolar field effect transistor using a 2,6-diphenylbenzo[1,2-b : 4,5-b']diselenophene/fullerene double layer

    DOI: 10.1016/j.ssc.2007.10.017

  • Frontier of organic light emitting devices 査読

    Chihaya Adachi, Toshinori Matsushima, Hajime Nakanotani, Tomo Sakanoue, Masayuki Yahiro, Daisuke Yokoyama

    PROCEEDINGS OF THE 2007 INTERNATIONAL WORKSHOP ON THE PHYSICS OF SEMICONDUCTOR DEVICES: IWPSD-2007   534 - 538   2007年12月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We report recent progresses on organic light emitting devices such as organic light emitting diode (OLED), light-emitting organic field effect transistor (LE-OFET) and organic laser diode (OLD). We demonstrate very low driving voltage of OLEDs using a p-i-n structure which also provides high current carrier injection over kA/cm(2). Further we demonstrate novel organic devices such as light emitting FET. We also discuss future prospect of OLD based on our recent materials' development and analysis of operation mechanism.

    DOI: 10.1109/IWPSD.2007.4472568

  • Observation of extremely high current densities on order of MA/cm(2) in copper phthalocyanine thin-film devices with submicron active areas 査読

    Toshinori Matsushima, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   46 ( 45-49 )   L1179 - L1181   2007年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Using contact photolithography and electron-beam lithography techniques, we manufactured copper phthalocyanine thin-film devices with active areas ranging from 1,000,000 to 0.04 mu m(2) to investigate how much current can flow through these devices with the aim of fabricating electrically pumped organic laser diodes. From the results of our current density-voltage (J-V) measurements, we found that the device with the smallest active area of 0.04 mu m(2) on a silicon substrate exhibits an extremely high current density of 6,350,000 A/cm(2) due to improved thermal management. The J-V characteristics of the devices are controlled by shallow-trap space-charge-limited current (SCLC), trap-free SCLC, and two-carrier injection current mechanisms over a wide range of current densities between nA/cm(2) and MA/cm(2).

    DOI: 10.1143/JJAP.46.L1179

  • Very low amplified spontaneous emission threshold and electroluminescence characteristics of 1,1 '-diphenyl substituted fluorene derivatives 査読

    Hajime Nakanotani, Naoki Matsumoto, Hiroyuki Uchiuzou, Masakazu Nishiyama, Masayuki Yahiro, Chihaya Adachi

    OPTICAL MATERIALS   30 ( 4 )   630 - 636   2007年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A blue amplified spontaneous emission with a very low threshold was observed in novel fluorene derivatives doped into a 4,4'-bis-(N-carbazole)-biphenyl (CBP) host. With 6wt&#37;-2,7-bis[4'-(N,N-diphenylamino)-1,1'-biphenyl-4-yl]-9,9-bis(1,1'-biphenyl-4-yl)-9H-fluorene (BDF2) or 2,7-bis[1,1'-biphenyl-4-yl]-9,9-bis(1,1'-biphenyl-4-yl)-9-H-fluorene (BBF) as a dopant, high photoluminescence quantum efficiencies of 90&#37; +/- 1&#37; and 78&#37; +/- 2&#37; with extremely low amplified spontaneous emission thresholds of 0.15 +/- 0.05 mu J/cm(2) (300 W/cm(2)) and 0.17 +/- 0.04 mu J/cm(2) (340 W/cm(2)) were obtained. We also observed a high gain coefficient (38 cm(-1)) and a low loss coefficient (6 cm(-1)) in a 6 wt&#37;-BDF2:CBP thin film optical-waveguide. Furthermore, an organic light emitting diode with BDF2 as an emitter demonstrated a high external quantum efficiency (eta(ext)) of 4.5&#37; +/- 0.1&#37;. In addition, electroluminescence from an organic field-effect transistor with BDF2 as an active material was also observed with a maximum eta(ext) of 0.02&#37;. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.optmat.2007.02.045

  • Alternating copolyfluorenevinyles with polynuclear aromatic moieties: Synthesis, photophysics, and electroluminescence 査読

    John A. Mikroyannidis, Larysa Fenenko, Masayuki Yahiro, Chihaya Adachi

    JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY   45 ( 20 )   4661 - 4670   2007年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Three new copolymers, namely poly(fluorenevinylene-alt-naphthalenevinylene) (N), poly(fluorenevinylene-alt-anthracenevinylene) (A) and poly(fluorenevinylene-alt-pyrenevinylene) (P), were synthesized by Heck coupling of 9,9-dihexyl-2,7-divinylfluorene with a polynuclear aromatic dibromide. The 9,10-disubstituted anthracene was obtained exclusively for A while N and P were obtained as a mixture of two isomers with predominant the 1,4-disubstituted naphthalene and 1,8-disubstituted pyrene, respectively. The polymers were soluble in common organic solvents and decomposed above 370 degrees C. Their glass transition temperature increased from 58 to 110 degrees C by increasing the number of the phenyl rings of the polynuclear aromatic moiety. Rather high-efficiency blue and blue-greenish photoluminescence (PL) of these copolymers in solution was largely decreased in their films, indicating the presence of concentration quenching in the solid state. The OLED using these polymers demonstrated green EL in the case of copolymers N and A, and red EL in the P derivative with eta(EL) = 0.26-0.31&#37;. (c) 2007 Wiley Periodicals, Inc.

    DOI: 10.1002/pola.22213

  • Features of conductivity and electroluminescence of new poly (9,9-dioctylfluorenyl-2,7-diyl) - End capped with polyhedral oligomeric silsesquioxanes 査読

    Larisa Fenenko, C. Adachi, Yoichiro Nakanishi, Petro Smertenko, Sergey Svechnikov

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   467   303 - 309   2007年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The emission and conductivity of anew polymerpoly (9,9-dioctylfluorenyl-2,7-diyl) end capped with polyhedral oligomeric silsesquioxanes (PFO-POSS) have been investigated by the differential approach. Thin films of PFO-POSS showed pure blue photoluminescence (PL) with structured spectrum and a maximum at lambda(PL) = 423 nm. However, the OLED structures formed on the PFO-POSS base emitted green light with broadened spectrum and a maximum at)lambda(EL) = 510 similar to 529 nm. The electroconductivity and electroluminescence have shown that the greatest influence on the current voltage and luminance current characteristics is rendered by introducing the electron transport layer to the multilayer OLED structure under investigation.

    DOI: 10.1080/15421400701224678

  • Estimation of electron traps in carbon-60 field-effect transistors by a thermally stimulated current technique 査読

    Toshinori Matsushima, Masayuki Yahiro, Chihaya Adachi

    APPLIED PHYSICS LETTERS   91 ( 10 )   2007年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors investigated the influence of O-2 and H2O molecules absorbed in carbon-60 (C60) films on their electron trap and n-type field-effect transistor (FET) characteristics. Electron traps in the C60 films were directly measured using a thermally stimulated current (TSC) technique. The TSC results demonstrate that the absorption of O-2 and H2O molecules in the C60 films induced an increase in the electron trap concentration, which degrades C60 FET characteristics. By annealing the C60 films at 100 degrees C for 8 h, the electron trap concentrations were markedly lowered, enhancing the C60 FET characteristics. An electron mobility of 0.017 cm(2)/V s and a current on/off ratio of 10(6) were observed from the degassed C60 FETs. (C) 2007 American Institute of Physics.

    DOI: 10.1063/1.2779240

  • Extremely low-threshold amplified spontaneous emission of 9,9 '-spirobifluorene derivatives and electroluminescence from field-effect transistor structure 査読

    Hajime Nakanotani, Seiji Akiyama, Dai Ohnishi, Masato Moriwake, Masayuki Yahiro, Toshitada Yoshihara, Seiji Tobita, Chihaya Adachi

    ADVANCED FUNCTIONAL MATERIALS   17 ( 14 )   2328 - 2335   2007年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    By doping 2,7-bis[4-(N-carbazole)phenylvinyl]-9,9'-spirobifluorene (spiro-SBCz) into a wide energy gap 4,4'-bis(9-carbazole)-2,2'-biphenyl (CBP) host, we demonstrate an extremely low ASE threshold of E-th = (0.11 +/- 0.05) mu J cm(-2) (220 W cm(-2)) which is the lowest ASE threshold ever reported. In addition, we confirmed that the spiro-SBCz thin film functions as an active light emitting layer in organic light-emitting diode (OLED) and a field-effect transistor (FET). In particular, we succeeded to obtain linear electroluminescence in the FET structure which will be useful for future organic laser diodes.

    DOI: 10.1002/adfm.200700069

  • High-current injection and transport on order of kA/cm(2) in organic light-emitting diodes having mixed organic/organic heterojunction interfaces 査読

    Toshinori Matsushima, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   46 ( 33-35 )   L861 - L863   2007年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We manufactured multilayer organic light-emitting diodes (OLEDs) with mixed organic/organic heterojunction interfaces composed of alpha-sexithiophene and phenyldipyrenylphosphine oxide carrier-transporting layers. In the mixed-interface OLEDs, we achieved a low driving voltage of 3.6 V at a current flow of 100 mA/cm(2), which was caused by efficient carrier injection at the mixed interfaces. We investigated how much current can flow through these OLEDs with the aim of fabricating electrically pumped organic laser diodes. We found that an OLED of this type with a small active area of 625 mu m(2) on a high-thermal-conductivity sapphire substrate can sustain high current densities of 1.1 kA/cm(2) and emits bright electroluminescence of 7.9 Mcd/m(2) under direct current.

    DOI: 10.1143/JJAP.46.L861

  • Spectrally narrow emission at cutoff wavelength from edge of electrically pumped organic light-emitting diodes 査読

    Daisuke Yokoyama, Hajime Nakanotani, Yousuke Setoguchi, Masato Moriwake, Dai Ohnishi, Masayuki Yahiro, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   46 ( 33-35 )   L826 - L829   2007年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate spectrally narrow emissions from the edge of electrically pumped organic light-emitting diodes having a fine "line-shaped" waveguide structure with a silver cathode. A 4,4'-bis[(N-carbazole)styryl]-biphenyl (BSB-Cz) layer, which has a very low amplified spontaneous emission threshold, was used as an emitting layer. We observed extremely narrow emissions having polarized transverse electric (TE) mode. The full width at half maximum became narrower down to 6.5 nm as the peak wavelength of the emission approached the wavelength of the 0-1 transition of the BSB-Cz layer. The edge emission intensity showed a superlinear relationship with the current density, and the spectral shapes changed appreciably depending on the current density, indicating the occurrence of amplification of the emitted light. The peak wavelengths of the edge emissions were attributed to the leaky mode very close to the cutoff wavelength of the waveguide structure having the metal cladding layer.

    DOI: 10.1143/JJAP.46.L826

  • Analysis of carrier traps in continuously operated 4,4'-bis[N-(1-naphthyl)-N-phenyl-amino]-biphenyl/tris(8-hydroxyquinoline)aluminum-based organic light-emitting diodes by thermally stimulated current measurement 査読

    Makoto Nakahara, Masahiro Minagawa, Takahito Oyamada, Toyoyasu Tadokoro, Hiroyuki Sasabe, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   46 ( 25-28 )   L636 - L639   2007年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We measured the reliability of two different organic light-emitting diodes (OLEDs) composed of indium tin oxide (ITO)/4,4 '-bis[N-(1-naphthyl)-N-phenyl-amino]biphenyl (alpha-NPD)/tris(8-hydroxyquinoline)aluminum (Alq(3))/MgAg (two layer) or ITO/ alpha-NPD/alpha-NPD:Alq(3) (mixed layer)/Alq(3)/MgAg. Changes in the carrier trap distribution were estimated by thermally stimulated current (TSC) measurements. Improved device reliability was observed in the mixed-layer device. In the case of the two layer device, the TSC peaks gradually changed depending on. the duration of continuous operation, while the mixed device showed no change in its TSC spectra. These spectral differences indicate that the mixing of alpha-NPD and Alq(3) occurs during the continuous operation in the two-layer device.

    DOI: 10.1143/JJAP.46.L636

  • Observation of Extremely High Current Densities on Order of MA/cm2 in Copper Phthalocyanine Thin-Film Devices with Submicron Active Areas

    Toshinori Matsushima and Chihaya Adachi

    Jpn. J. Appl. Phys.   2007年7月

  • Ambipolar field-effect transistor based on organic-inorganic hybrid structure

    Hajime Nakanotani, Masayuki Yahiro, Koki Yano and Chihaya Adachi

    Appl. Phys. Lett.   2007年7月

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    記述言語:英語  

  • Blue Organic Electrophosphorescence Diodes using Diarylamino-substituted Heterocyclic Compounds as Host Material

    Kyung Soo Son, Masayuki Yahiro, Toshiro Imai, Hiroki Yoshizaki and Chihaya Adachi

    J. Photopolymer Sci. & Tech.   2007年7月

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    記述言語:英語  

  • Very low amplified spontaneous emission threshold and electroluminescence characteristics of 1,1'-diphenyl substituted fluorene derivatives

    Hajime Nakanotani, Naoki Matsumoto, Hiroyuki Uchiuzou, Masakazu Nishiyama, Masayuki Yahiro and Chihaya Adachi

    Optical Materials   2007年7月

  • High-current Injection and Transport on Order of kA/cm2 in Organic Light-emitting Diodes Having Mixed Organic/Organic Heterojunction Interfaces

    Toshinori Matsushima and Chihaya Adachi

    Jpn. J. Appl.Phys.   2007年7月

  • Estimation of electron traps in carbon-60 field-effect transistors by a thermally stimulated cureent technique

    Toshinori Matsushima, Masayuki Yahiro, and Chihaya Adachi

    Appl. Phys. Lett.   2007年7月

  • Spectally Narrow Emission at Cutoff Wavelength from Edge of Electrically Pumped Organic Light-Emitting Diodes

    Daisuke Yokoyama, Hajime Nakanotani, Yousuke Setoguchi, Masato Moriwake, Dai Ohnishi, Masayuki Yahiro, and Chihaya Adachi

    Jpn. J. Appl. Phys.   2007年7月

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    記述言語:英語  

  • Features of conductivity and electroluminescence of new poly (9,9-dioctylfluorenyl-2,7-diyl) - End capped with polyhedral oligomeric silsesquioxanes

    L. Fenenko, C. Adachi, Y. Nakanishi, P. Smertenko, and S. Svechinikov

    Mol. Cryst. LIq. Cryst.   2007年7月

  • 化学ドーピングによる有機EL素子の低駆動電圧化 Lowering the Driving Voltage of Organic Lihgt Emitting Diodes by Chemical Doping

    安達千波矢、 小山田崇人、松島敏則

    表面科学   2007年7月

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    記述言語:日本語  

  • 1,4-bis(2,2-diphenylethenyl) benzene as an efficient emitting material for organic light emitting diodes

    Larysa Fenenko, Guoliang Mao, Akihiro Orita, Junzo Otera, Petro Smertenko, Georgi Svechnikov, Jun-ichi Nishide, Hiroyuki Sasabe, and Chihaya Adachi

    Semiconductor Physics, Quantum Electronics & Optoelectronics   2007年7月

  • Spectrally narrow emission from organic films under continuous-wave excitation 査読

    Hajime Nakanotani, Chihaya Adachi, Sadayuki Watanabe, Ryuzi Katoh

    APPLIED PHYSICS LETTERS   90 ( 23 )   2007年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors observed a narrow emission from a 500-nm-thick codeposited organic thin film, 6 wt &#37; 4,4(')-bis[(N-carbazole)styryl]-biphenyl (BSB-Cz) doped into a 4,4(')-bis(N-carbazole)-biphenyl host, under continuous-wave excitation. Although they observed no clear threshold characteristics on the spectral narrowing, they found that the emission centered at a wavelength of lambda(ASE)=462 nm, corresponding to the zero to one transition of BSB-Cz, has a transverse electric mode with a narrow full width at half maximum of lambda(FWHM)=3.4 nm, indicating the occurrence of amplified spontaneous emission. No excited state absorptions of singlet and triplet excited states of BSB-Cz are confirmed around lambda(ASE), leading to large net gain for the light amplification. (c) 2007 American Institute of Physics.

    DOI: 10.1063/1.2746958

  • Ambipolar field-effect transistor based on organic-inorganic hybrid structure 査読

    Hajime Nakanotani, Masayuki Yahiro, Chihaya Adachi, Koki Yano

    APPLIED PHYSICS LETTERS   90 ( 26 )   2007年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors developed an ambipolar field-effect transistor (FET) based on an organic-inorganic hybrid structure that consisted of an indium zinc oxide and pentacene double layer fabricated on a SiO2/n(++)-Si substrate. Although the FETs based on an indium zinc oxide or pentacene single layer only showed unipolar FET characteristics, the hybrid FET showed definite ambipolar FET characteristics. The authors obtained a highly saturated field-effect hole and electron mobilities of 0.14 and 13.8 cm(2)/V s. Furthermore, the authors demonstrated electroluminescence from hybrid FETs using tetracene as an emitting layer. The authors' success shows that the hybridization of organic and inorganic materials opens up a new field in electronics. (c) 2007 American Institute of Physics.

    DOI: 10.1063/1.2752023

  • Ambipolar field-effect transistor of high photoluminescent material tetraphenylpyrene (TPPy) single crystal 査読

    Satria Zulkarnaen Bisri, Tetsuo Takahashi, Taishi Takenobu, Masayuki Yahir, Chihaya Adachi, Yoshihiro Iwasa

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   46 ( 20-24 )   L596 - L598   2007年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    An ambipolar field-effect transistor (FET) based on a 1,3,6,8-tetraphenylpyrene (TPPy) single crystal, a highly photoluminescent material, has been successfully fabricated. Several kinds of metal electrodes have been employed to investigate the charge injection characteristics into the single-crystal FET. Hole and electron mobilities of 0.34 and 7.7 x 10(-2) cm(2)/(V center dot s) were achieved using Au and Ca electrodes, respectively. The ambipolar characteristic of this device gives a prospect for further development in light-emitting FET operation.

    DOI: 10.1143/JJAP.46.L5961

  • Electrical properties of 1,4-bis(4-(phenylethynyl)phenylethynyl)benzene and its application for organic light emitting diodes 査読

    Larysa Fenenko, Guang Shao, Akihiro Orita, Masayuki Yahiro, Junzo Otera, Sergei Svechnikov, Chihaya Adachi

    CHEMICAL COMMUNICATIONS   ( 22 )   2278 - 2280   2007年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We found that a phenylene ethynylene derivative, 1,4-bis(4-(phenylethynyl)phenylethynyl)benzene (BPPB), provides very high photoluminescence efficiency both in solution (Phi(PL) = 95 +/- 3&#37;) and thin films (Phi(PL) = 71 +/- 3&#37;); further, we observed blue electroluminescence (EL) of lambda(EL (max)) similar to 470 and 510 nm with an external EL efficiency of eta(EL) similar to 0.53&#37; and maximum luminance of similar to 70000 cd m(-2) at current density of similar to 2 A cm(-2) with BPPB as an emitter; also we identified that BPPB functions as a hole transport layer in organic light emitting diodes.

    DOI: 10.1039/b700466d

  • Top light-harvesting organic solar cell using ultrathin Ag/MgAg layer as anode 査読

    Takahito Oyamada, Yuhsuke Sugawara, Yuhki Terao, Hiroyuki Sasabe, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46 ( 4A )   1734 - 1735   2007年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We fabricate a top light-harvesting organic solar cell (TL-OSC) with a Si substrate/SiO2 layer/cathode/organic layer/semitransparent metal anode structure. We obtain power conversion efficiency (eta(p)) comparable to that of conventional bottom-type OSCs. To harvest light from a top anode, we use a 1 nm Ag layer/4 nm MgAg layer having a transmittance of 55 - 80&#37; in the visible and near-infrared regions. We also insert an ultrathin molybdenum oxide (MoO3) layer at the cathode/organic layer interface to increase hole collection efficiency from the organic layer into the cathode.

    DOI: 10.1143/JJAP.46.1734

  • Ambipolar light-emitting organic field-effect transistors using a wide-band-gap blue-emitting small molecule 査読

    Tomo Sakanoue, Masayuki Yahiro, Chihaya Adachi, Hiroyuki Uchiuzou, Takayoshi Takahashi, Akio Toshimitsu

    APPLIED PHYSICS LETTERS   90 ( 17 )   2007年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors applied a wide-band-gap (2.9 eV) molecule of 4,-4(')-bis(styryl)biphenyl (BSBP) as an active layer in light-emitting organic field-effect transistors. They found that BSBP provided both relatively high field-effect hole mobility of 0.01 cm(2)/V s and photoluminescence efficiency of 20&#37; in thin film. They achieved ambipolar operation by without breaking vacuum through devices' preparation and measurements, applying aluminum contacts, and inserting a hydroxyl-free poly(methylmethacrylate) layer, and light emission was observed when the device was operated in the ambipolar mode. The results presented here will open the way to fabricating efficient light-emitting transistors with high mobility. (c) 2007 American Institute of Physics.

    DOI: 10.1063/1.2734389

  • Influence of heat treatment on indium-tin-oxide anodes and copper phthalocyanine hole injection layers in organic light-emitting diodes 査読

    Larysa Fenenko, Chihaya Adachi

    THIN SOLID FILMS   515 ( 11 )   4812 - 4818   2007年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Modifications of indium-tin-oxide (ITO) and copper phthalocyanine (CuPc) layers by heat treatment aimed at lowering driving voltage in organic light-emitting diodes (OLEDs) are examined. Significant changes were observed in the surface morphology and carrier injection properties of ITO and CuPc layers after annealing at T=250 degrees C for 0-60 min in a glove box. In the case of ITO annealing, although the ITO work function gradually decreased and the surface of the ITO layer became smoother than that of an unannealed ITO layer, we observed an appreciable decrease in the driving voltage with an increase in annealing time. In the case of CuPc annealing, on the other hand, we observed deterioration of the OLED's characteristics. All devices demonstrated an increase in driving voltage due to the pronounced crystallization of the CuPc layer. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2006.11.116

  • Material design of hole transport materials capable of thick-film formation in organic light emitting diodes 査読

    Masaki Aonuma, Takahito Oyamada, Hiroyuki Sasabe, Tetsuzou Miki, Chihaya Adachi

    APPLIED PHYSICS LETTERS   90 ( 18 )   2007年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In this study, the authors show an empirical guideline for designing hole transport materials (HTMs) that suppress rises in driving voltage even with a few hundred nanometer thick film in the organic light emitting diodes (OLEDs). In a device structure of indium tin oxide (110 nm)/hole transport layer (HTL) (X nm)/4,4(')-N,N-'-bis[N-(1-naphthyl)-N-phenyl-amino]biphenyl (10 nm)/tris-(8-hydroxyquinoline)aluminum (Alq(3)) (50 nm)/MgAg (100 nm)/Ag (10 nm), the authors compared electroluminescence characteristics of the OLEDs having a thin-film HTL (X=50 nm) and a thick-film HTL (X=300 nm) using 13 kinds of HTMs. They observed a closed correlation between suppression of the driving voltage and the HTMs' thermal characteristics. Highly thermally stable HTMs resulted in a small increase in the driving voltage. (c) 2007 American Institute of Physics.

    DOI: 10.1063/1.2733627

  • Altarnating Copolyfluorenevinyles with Polynuclear Aromatic Moieties: Synthesis, Photophysics, and Electroluminescence

    John A. Mikroyannidis, Larysa Fenenko, Masayuki Yahiro, and Chihaya Adachi

    J. Poly. Sci.,A: Poly. Chem.   2007年4月

  • Top Light-Harvesting Organic Solar Cell Using Ultrathin Ag / MgAg Layer as Anode 国際誌

    Takahito Oyamada, Yusuke Sugawara, Yuhki Terao, Hiroyuki Sasabe and Chihaya Adachi

    Jpn. J. Appl. Phys.   2007年4月

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    記述言語:英語  

  • Ambipolar light-emitting organic field-effect transistors using a wide-band-gap blue-emitting small molecule 国際誌

    Tomo Sakanoue, Masayuki Yahiro, Chihaya Adachi, Hiroyuki Uchiuzou, Takahashi Takayoshi and Akio Toshimitsu

    Appl. Phys. Lett.   2007年4月

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    記述言語:英語  

  • Material design of hole transport materials capable of thick film formation in organic light emitting diodes 国際誌

    M. Aonuma, T. Oyamada, T. Miki, H. Sasabe and C. Adachi

    Appl. Phys. Lett.   2007年4月

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    記述言語:英語  

  • Optical Properties of Oligo(9,9-diarylfluorene) Derivatives in Thin Films and Their Application for Organic LIght-Emitting Field-Effect Transistors

    Takahito Oyamada, Chih-Hao Chang, Teng-Chih Chao, Fu-Chuan Fang, Chung-Chih Wu, Ken-Tsung Wong, Hiroyuki Sasabe, and Chihaya Adachi

    J. Phys. Chem.   2007年4月

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    記述言語:英語  

  • Ambipolar Field-Effect Transistor of High Photoluminescent Material Tetraphenylpyrene(TTPy) Single Crystal

    Satria Zulkarnaen Bisri, Tetsuo Takahashi, Taishi Takenobu, Masayuki Yahiro, Chihaya Adachi, and Yoshihiro Iwasa

    Jpn.J.Appl.Phys.   2007年4月

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    記述言語:英語  

  • Spectrally Narrow Emission from Organic Films Under Continuous-Wave Excitation

    H. Nakanotani, C. Adachi, S. Watanabe, and R. Katoh

    Appl.Pys.Lett., 90,231109   2007年4月

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    記述言語:英語  

  • Analysis of Carrier Traps in Continuously Operated 4,4'-bis [N-(1-naphthyl)-N-phenyl-amino]-biphenyl/tris(8-gydroxyquinoline) aluminum-Based Organic Light-Emitting Diodes by Thermally Stimulated Current Measurement

    Makoto Nakahara, Masahiro Minagawa, Takahito Oyamada, Toyoyasu Tadokoro, Hiroyuki Sasabe and Chihaya Adachi

    Jpn.J.Applied.Physics   2007年4月

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    記述言語:英語  

  • Extremely Low-Threshold Amplified Spontaneous Emission of 9,9'-Spirobifluorene Derivatives and Electroluminescence from Field-Effect Transistor Structure

    Hajime Nakanotani, Seiji Akiyama, Dai Ohnishi, Masato Moriwake, Masayuki Yahiro, Toshitada Yoshihara, Seiji Tobita and Chihaya Adachi

    Advanced Functional Materials   2007年4月

  • Highly efficient and stable red phosphorescent organic light-emitting device using bis[2-(2-benzothiazoyl)phenolato]zinc(II) as host material 査読

    Hiroshi Kanno, Kaori Ishikawa, Yoshitaka Nishio, Ayataka Endo, Chihaya Adachi, Kenichi Shibata

    APPLIED PHYSICS LETTERS   90 ( 12 )   2007年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The red-emitting phosphorescent organic light-emitting device employing Bis[2-(2-benzothiazoyl)phenolato]zinc(II) (Zn(BTP)(2)) as a host material has been demonstrated. The device generates saturated red emission with Commission Internationale de l'Eclairage coordinates of (0.67, 0.33), characterized by a low driving voltage of 3.2 V and high external quantum efficiency of 10.3&#37; at 10 mA/cm(2). Moreover, the efficiency and lifetime are improved by using 30&#37; NPB-doped Zn(BTP)(2) host in the emitting layer, where NPB is 4,4(')-bis(N-phenyl-1-naphthyl-amino)biphenyl. The maximum external quantum efficiency of the device reaches 12.6&#37; at 1.7 mA/cm(2). The device has exhibited excellent stability. The half-luminance lifetime is 240 h at 80 mA/cm(2) (initial luminance of 6070 cd/m(2)). The relationship between the employed host material and device performance is discussed. (c) 2007 American Institute of Physics.

    DOI: 10.1063/1.2643908

  • Correlation of hole mobility, exciton diffusion length, and solar cell characteristics in phthalocyanine/fullerene organic solar cells 査読

    Yuhki Terao, Hiroyuki Sasabe, Chihaya Adachi

    APPLIED PHYSICS LETTERS   90 ( 10 )   2007年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The authors investigated heterojunction organic solar cells composed of different metal phthalocyanines (MPcs, M=Fe, Co, Ni, Cu, and H-2)/fullerene (C-60) and compared the solar cell characteristics with the field-effect hole mobilities (mu(h)) and exciton diffusion length (L-ex) of the different MPcs. They observed that the short circuit current (J(SC)) is linearly dependent on the mu(h) of the MPcs, except for ZnPc. They also estimated the L-ex of the MPcs by creating a line of best fit using the action spectra of the external quantum efficiency in the solar cells and found that J(SC) is closely correlated with the L-ex of the MPcs. (c) 2007 American Institute of Physics.

    DOI: 10.1063/1.2711525

  • Highly efficient and stable red phosphorescent organic light-emitting device using bis[2-(2-benzothiazoyl)phenolato]zinc(II) as host material 国際誌

    Hiroshi Kanno, Kaori Ishikawa, Yoshitakta Nishio, Ayataka Endo, Chihaya Adachi, Kenichi Shibata

    Appl. Phys. Lett.   2007年3月

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    記述言語:日本語  

  • Correlation of hole mobility, exciton diffusion length, and solar cell characteristics in phthalocyanine/fullerene organic solar cells 国際誌

    Yuhki Terao, Hiroyuki Sasabe and Chihaya Adachi

    Appl. Phys. Lett.   2007年3月

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    記述言語:英語  

  • Charge-carrier injection characteristics at organic/organic heterojunction interfaces in organic light-emitting diodes 査読

    Toshinori Matsushima, Kenichi Goushi, Chihaya Adachi

    CHEMICAL PHYSICS LETTERS   435 ( 4-6 )   327 - 330   2007年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic light-emitting diodes (OLEDs) having various guest molecules doped in an organic host matrix layer are fabricated [the OLED structure is anode/hole-transporting layer (HTL)/guest-host emitting layer/hole-blocking layer/electron-transporting layer/cathode], and the dependence of current density-voltage (J-V) characteristics of the OLEDs on highest occupied molecular orbital (HOMO) levels of guest molecules are investigated. From the J-V characteristics of these OLEDs, we find two important results: (1) J-V characteristics of the OLEDs are controlled by the direct hole injection from the neighboring HTL to guest molecules, and (2) HOMO level alignment between the HTL and guest molecules provides efficient hole injection at this interface. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2007.01.010

  • キャリア注入・輸送層ドーピングによる有機LEDの特性向上

    安達千波矢, 小山田崇人, 松島敏則

    Molecular Electronics and Bioelectronics   2007年2月

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    記述言語:日本語  

  • Blue organic electrophosphorescence diodes using diarylamino-substituted heterocyclic compounds as host material 査読

    Kyung Soo Son, Masayuki Yahiro, Toshiro Imai, Hiroki Yoshizaki, Chihaya Adachi

    JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY   20 ( 1 )   47 - 51   2007年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Diarylamino-substituted heterocyclic compounds (DHCs), 2,6-dicarbazolo-1,5-pyridine (PYD2) and 2,4,6-tricarbazolo-1,3,5-pyrimidine, (PYM3), possess a high triplet energy level (T-1) of T-1= 2.93 eV (PYD2) and T-1= 2.89 eV (PYM3), respectively, in their solid state films. 6wt&#37;-Iridium(III)bis[(4,6-di-fluorophenyl)-pyridinato-N,C-2]picolinate (Flrpic):PYD2- and 6wt&#37;-FIrpic:PYM3-doped films showed high photoluminescence (PL) efficiencies of Phi(PL) = 88 +/- 2 &#37; and Phi(PL)= 80 +/- 1 &#37;, indicating near perfect confinement of FIrpic triplet excitons. By increasing the FIrpic concentration in DHC hosts, lower driving voltage and higher external electroluminescence (EL) quantum efficiencies (eta(EL)) were observed, indicating enhancement of electron injection and transport (electron current) in these emitting layers.

    DOI: 10.2494/photopolymer.20.47

  • Optical properties of oligo(9,9-diarylfluorene) derivatives in thin films and their application for organic light-emitting field-effect transistors 査読

    Takahito Oyamada, Chih-Hao Chang, Teng-Chih Chao, Fu-Chuan Fang, Chung-Chih Wu, Ken-Tsung Wong, Hiroyuki Sasabe, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY C   111 ( 1 )   108 - 115   2007年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrated that oligo(9,9-diarylfluorene) derivatives have high potential for optoelectronic applications such as organic lasers and light-emitting organic field-effect transistors (LE-OFETs). The oligo(9,9diarylfluorene) derivatives have high photoluminescence quantum efficiencies up to Phi(PL) approximate to 70-75&#37; and very low amplified spontaneous emission thresholds (E-th) down to 0.5 AJ/cm(2) in their vacuum-deposited neat films. In particular, the trimer derivatives (B3 and T3) show higher PL and lower Eth than those of the dimers (B2 and T2). Efficient deep-blue LE-OFETs with the electroluminescence (EL) peaking at lambda(peak) = 429 nm were demonstrated using the ter(9,9-diarylfluorene) as the active layer. Rather high luminance up to L approximate to 150 cd/m(2) and EL quantum efficiency up to eta(ext) approximate to 0.60&#37; were achieved with the optimum source-drain channel length, indicating bipolar carrier injection in the terfluorene layer under the FET operation.

    DOI: 10.1021/jp0654056

  • Influence of heat treatment on indium-tin-oxide anodes and copper phthalocyanine hole injection layers in organic light-emitting diodes 国際誌

    L. Fenenko and C. Adachi

    Thin Solid Films   2007年1月

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    記述言語:英語  

  • Charge-carrier injection characteristics at organic/organic heterojunction interfaces in organic light-emitting diodes

    Toshinori Matsushima, Kenichi Goushi, and Chihaya Adachi

    Chem. Phys. Lett.   2007年1月

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    記述言語:英語  

  • Injection of current densities over kA/cm(2) in organic thin films and investigation of charge-carrier transport mechanisms in current density region between nA/cm(2) and kA/cm(2) 査読

    Toshinori Matsushima, Chihaya Adachi

    ORGANIC LIGHT EMITTING MATERIALS AND DEVICES X   6333   2006年12月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We investigate current density-voltage (J-V) characteristics of copper plithalocyanine thin-film devices, with active areas ranging from S = 1,000,000 to 7.9 mu m(2), and analyze their charge-carrier transport mechanisms under current densities between nA/cm(2) and kA/cm(2). We demonstrate injection of 128 kA/cm(2) in the smallest device having S = 7.9 tM2. Furthermore, we find that J-V characteristics are divided into three regions between nA/cm(2) and kA/cm(2) : ohm current, shallow-trap space-charge-limited current (SCLC), and trap-free SCLC. In a shallow-trap SCLC region, we observe a large shift in J-V characteristics depending upon the active areas. From analyses of carrier traps with a thermally stimulated current (TSC) measurement, we see that TSC signal intensities of these films decrease as the active area is reduced. Hence, we conclude that a large shift in J-V characteristics is attributable to the change of carrier trap concentrations in these films.

    DOI: 10.1117/12.682122

  • Extremely low voltage organic light-emitting diodes with p-doped alpha-sexithiophene hole transport and n-doped phenyldipyrenylphosphine oxide electron transport layers 査読

    Toshinori Matsushima, Chihaya Adachi

    APPLIED PHYSICS LETTERS   89 ( 25 )   2006年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Organic light-emitting diodes with p-doped alpha-sexithiophene and n-doped phenyldipyrenylphosphine oxide carrier transport layers are fabricated. In the doped diodes, the authors demonstrate an extremely low driving voltage of 2.9 V at a current density of 100 mA/cm(2) and very high luminance at a low driving voltage: 1000 cd/m(2) at 2.4 V, 10 000 cd/m(2) at 2.8 V, and 920 000 cd/m(2) at 4.5 V. Such lowered driving voltages and enhanced luminance characteristics are attributed to the generation of free charge carriers by charge transfer from matrix to dopant molecules, resulting in an increase in electrical conductivities and formation of Ohmic contacts at metal/organic interfaces. (c) 2006 American Institute of Physics.

    DOI: 10.1063/1.2410236

  • High field-effect mobility in an organic thin-film transistor with a solid-state polymerized polydiacetylene film as an active layer 査読

    Jun-ichi Nishide, Takahito Oyamada, Seiji Akiyama, Hiroyuki Sasabe, Chihaya Adachi

    ADVANCED MATERIALS   18 ( 23 )   3120 - +   2006年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A highly ordered polydiacetylene thin film was prepared by vacuum deposition of 10,12-pentacosadiynoic acid, followed by photopolymerization of this layer under UV irradiation. Using an optimum substrate temperature of 50 degrees C during the monomer deposition, we obtained a high field-effect hole mobility of 0.8 cm(2) V-1 s(-1) with p-type field-effect transistor characteristics in the top source-drain electrode configuration.

    DOI: 10.1002/adma.200601419

  • Novel blue-greenish electroluminescent poly(fluorenevinylene-alt- dibenzothiophenevinylene)s and their model compounds 査読

    John A. Mikroyannidis, Helen A. Moshopoulou, John A. Anastasopoulos, Minas M. Stylianakis, Larysa Fenenko, Chihaya Adachi

    Journal of Polymer Science, Part A: Polymer Chemistry   44 ( 23 )   6790 - 6800   2006年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Poly(9,9-dihexylfluorene-2,7-vinylene-alt-dibenzothiophene-2,8-vinylene) (PS) and poly(9,9-dihexylfluorene-2,7-vinylene-alt-dibenzothiophene-5,5-dioxide- 2,8-vinylene) (PSO) as well as corresponding model compounds were synthesized by Heck coupling. Both the polymers and model compounds were readily soluble in common organic solvents such as tetrahydrofuran, dichloromethane, chloroform, and toluene. The polymers showed a decomposition temperature at ∼430°C and a char yield of about 65&#37; at 800°C in N2. The glass-transition temperatures of the polymers were almost identical (75-77°C) and higher than those of the model compounds (26-45°C). All samples absorbed around 390 nm, and their optical band gaps were 2.69-2.85 eV. They behaved as blue-greenish light emitting materials in both solutions and thin films, with photoluminescence emission maxima at 450-483 nm and photoluminescence quantum yields of 0.52-0.72 in solution. Organic light-emitting diodes with an indium tin oxide/ poly(ethylene dioxythiophene):poly(styrene sulfonic acid)/polymer/Mg:Ag/Ag configuration with polymers PS and PSO as emitting layers showed green electroluminescence with maxima at 530 and 540 nm, respectively. © 2006 Wiley Periodicals, Inc.

    DOI: 10.1002/pola.21753

  • Novel electron-transporting carbazolylphenylquinolines for phosphorescent organic light-emitting diodes 査読

    Atsushi Takahashi, Ayataka Endo, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   45 ( 12 )   9228 - 9230   2006年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We developed four types of novel electron-transporting carbazolylphenyl-quinoline (CQ) derivatives. The photophysical and thermal properties of these materials were studied. Moreover, these materials were applied for an electron-transport layer and for a host material in phosphorescent organic light-emitting diodes, and a high electroluminescence (EL) efficiency was obtained in these devices. With 2-(3-(3,6-diphenylcarbazole-9-yl)phenyl)lepidine (DPCLP) as a host and tris(2-phenylpyridine)iridium(III) [lr(PPY)3] as a guest, the highest EL efficiency of eta(ext) = 11.2&#37; was obtained.

    DOI: 10.1143/JJAP.45.9228

  • Optical and electrical properties of bis(4-(phenylethynyl)phenyl)ethynes and their application to organic field-effect transistors 査読

    Takahito Oyamada, Guang Shao, Hiroyuki Uchiuzou, Hajime Nakanotani, Akihiro Orita, Junzo Otera, Masayuki Yahiro, Chihaya Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   45 ( 46-50 )   L1331 - L1333   2006年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate that bis(4-(phenylethynyl)phenyl)ethynes (BPEPEs) have high potential as organic field-effect transistors (FETs). We observed a p-type transistor operation in FETs with BPEPE derivatives having electron-donating substituents. The devices showed FET hole mobilities in the range of mu(eta) = 10(-3)-10(-5) cm(2)/(V s), depending on the substituents. Further, bis(4(4-trifluoromethylphenylethynyl)phenyl)ethyne (4-CF3-BPEPE), which has an electron-withdrawing group, indicated n-type operation.

    DOI: 10.1143/JJAP.45.L1331

  • Optical properties of oligo(9,9-diaryfluorene) derivatives in thin films and their application for organic light-emitting field-effect transistors 国際誌

    Takahito Oyamada, Chihaya Adachi, Chung-Chih Wu, Chih-Hao Chang, Ken-Tsung Wong, Teng-Chih Chao, and Fu-Chuan Fang

    J. Phys. Chem. C   2006年12月

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    記述言語:英語  

  • Novel Electron-transporting Carbazolylphenylquinolines for the Phosphorescent Organic Light Emitting Diodes 国際誌

    Atsushi Takahashi, Ayataka Endo and Chihaya Adachi

    Jpn. J. Appl. Phys.   2006年12月

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    記述言語:英語  

  • Optical and electrical properties of quinqueacetylphenyl derivatives and the application for organic field-effect transistors 国際誌

    Takahito Oyamada, Guang Shao, Hiroyuki Uchiuzou, Hajime Nakanotani, Akihiro Orita, Junzo Otera, Masayuki Yahiro, and Chihaya Adachi

    Jpn. J. Appl. Phys.   2006年12月

  • Extremely low-voltage organic light-emitting diodes with p-doped alpha-sexithiophene hole transport and n-doped phenyldipyrenylphosphine oxide electron transport layers 国際誌

    T. Matsushima and C. Adachi

    Appl. Phys. Lett.   2006年12月

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    記述言語:英語  

  • 有機薄膜への高電流密度の注入と低電流密度から高電流密度域におけるキャリア輸送特性

    松島敏則, 安達千波矢

    Molecular Electronics and Bioelectronics   2006年12月

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    記述言語:日本語  

  • 強リン光性分子薄膜の開発と発光デバイスへの応用

    安達千波矢,河村祐一郎,合志憲一,遠藤礼隆

    応用物理   2006年12月

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    記述言語:英語  

  • Topological change of 4, 4’-bis[9-dicarbazolyl]-2,2’-biphenyl (CBP) by intermolecular rearrangement 国際誌

    K. S. Son, T. Mishina, S. Yamamoto, J. Nakahara, C. Adachi, and Y.Kawamura

    Proceeding of the international symposium on TOP, World Scientific Publishing   2006年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

  • 有機発光ダイオードから有機レーザーへの応用展開

    安達千波矢,松島敏則,中野谷一

    光学   2006年11月

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    記述言語:日本語  

  • Photoluminescence characteristics of dendrimers containing (tris(8-hydroxyquinoline)aluminum) as a core unit 査読

    Shinya Furusake, Sumio Maruyama, Hiroyuki Sasabe, Chihaya Adachi

    KOBUNSHI RONBUNSHU   63 ( 10 )   675 - 680   2006年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    We report on photoluminescence (PL) characteristics of dendrimers having (tris (8-hydroxy quinoline)aluminum) (Alq(3)) as a core unit. Although Alq3 derivatives are generally insoluble, the dendrimers were soluble in conventional organic solvents due to the presence of bulky dendron. We measured the transient PL and absolute PL efficiency of the dendrimers, dendron and AlClq(3) (core unit), and we clarified the location of pi-conjugation, which is an origin of PL. The PL characteristics indicated that pi-conjugation in the dendrimers is localized between a dendron and a quinoline ligand. Although the PL efficiencies are Phi(PL) = 20-40&#37; in their solid films, the EL efficiencies are limited to Phi(EL) similar to 10(-2)&#37;.

    DOI: 10.1295/koron.63.675

  • Synthesis and photophysical characteristics of 2,7-fluorenevinylene-based trimers and their electroluminescence 査読

    John A. Mikroyannidis, Larysa Fenenko, Chihaya Adachi

    JOURNAL OF PHYSICAL CHEMISTRY B   110 ( 41 )   20317 - 20326   2006年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Three new 2,7-fluorenevinylene-based trimers were synthesized and characterized. The synthesis was carried out by the Heck coupling reaction of 9,9-dihexyl-2,7-divinylfluorene with 2-(4-bromophenyl-5-phenyl-1,3,4-oxadiazole, N,N-diphenyl-4-bromoaniline, or 3-bromopyrene to afford the trimers OXD, TPA, and PYR, respectively. All the trimers were readily soluble in common organic solvents such as tetrahydrofuran, dichloromethane, chloroform, and toluene. Their glass transition temperatures ranged from 33 to 60 C. The UV-vis spectra showed an absorption maximum at lambda(a,max) = 379-417 nm with optical band gap of E-g = 2.47-2.66 eV. In solution, they emitted strong blue-green photoluminescence (PL) with PL maximum at If, max) 455-565 nm and fluorescence quantum yield of Phi(f) = 0.65-0.74. On the other hand, in their spin-coated films, the PL efficiencies significantly decreased due to the presence of concentration quenching. All samples showed nanosecond transient lifetime containing two components, suggesting excimer formation. The organic light-emitting diodes (OLEDs) with OXD and TPA showed green emission with electroluminescence (EL) quantum efficiencies of eta(EL) similar to 10(-2)&#37;, while very weak EL efficiency of eta(EL) similar to 10(-5)&#37; was observed with PYR. The highest occupied molecular orbital (HOMO) levels of the films were found to be 5.05-5.75 eV.

    DOI: 10.1021/jp0631477

  • シロキサン化合物を発光層のホスト材料として用いた青色有機ELデバイスの素子特性

    遠藤礼隆,J. Brooks,J. J. Brown,雀部博之,安達千波矢

    高分子論文集   2006年10月

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    記述言語:日本語  

  • 可溶性トリス(8-キノリノレート)アルミニウム含有デンドリマーの発光特性

    古酒慎也,丸山純夫,雀部博之,安達千波矢

    高分子論文集   2006年10月

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    記述言語:日本語  

  • Organic blue electrophosphorescence using a cyclic siloxane compound as a host material 査読

    Ayataka Endo, Jason Brooks, Julie J. Brown, Hiroyuki Sasabe, Chihaya Adachi

    KOBUNSHI RONBUNSHU   63 ( 10 )   686 - 690   2006年9月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    In organic blue electrophosphorescence diodes, we used hexaphenylcyclotrisiloxane (DPSiO3) as a host material aiming for high efficiency blue electroluminescence (EL). The phosphorescence spectrum of the siloxane compound was measured at T = 77 K in an EPA solution and the results well coincided with those of a benzene solution, indicating that the pi-conjugation of DPSiO3 is basically localized in a benzene ring. In the OLED devices with DPSiO3 as a host, the maximum external EL efficiency of eta(ext) = 11.1&#37; was obtained with iridium (III) bis (4,6-di-fluorophenyl)-pyridinato-N, C-2) picolinate (FIrpic) as an emitter.

    DOI: 10.1295/koron.63.686

  • Synthesis and Photophysical Characteristics of 2,7-Fluorenevinylene-based Trimers and their Electroluminescence 国際誌

    J. A. Mikroyannidis, L. Fenenko, and C. Adachi

    J. Phys. Chem. B   2006年9月

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    記述言語:英語  

  • Spin-relaxation process of excited triplet states of Ir(ppy)(3) 査読

    Kenichi Goushi, Jason Brooks, Julie J. Brown, Hiroyuki Sasabe, Chihaya Adachi

    JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY   19 ( 2 )   181 - 186   2006年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The phosphorescence intensities of the green phosphor, fac tris(2-phenylpyridine) iridium [Ir(ppy)(3)], in a polymethylmethacrylate [PMMA] host matrix are independent of temperature, while the phosphorescence lifetimes increase significantly at temperatures below T similar to 50 K. In this paper, to rationalize the characteristic temperature dependence of the transient phosphorescence of Ir(ppy)(3), we propose a model where the triplet excited states split by spin-orbital interaction, forming three levels in which mutual energy transfer between the sub-levels of triplet states occurs. We discuss the validity of this numerical model by comparing with the experimental result of the transient phosphorescence in a PMMA host matrix and demonstrate that the model well explains the characteristic temperature dependence.

    DOI: 10.2494/photopolymer.19.181

  • 低電圧駆動を目指した低分子有機EL素子

    小山田崇人,安達千波矢

    日本画像学会誌   2006年8月

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    記述言語:日本語  

  • Novel Blue-Greenish Electroluminescent Poly(Fluorenevinylene-alt-Dibenzothiophenevinylene)s and their Model Compounds 国際誌

    John A. Mikroyannidis, Helen A. Moshopoulou, John A. Anastasopoulos, Minas M. Stylianakis, Larysa Fenenko, and Chihaya Adachi

    J. Poly. Sci., A: Poly. Chem.   2006年7月

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    記述言語:英語  

  • Novel active-matrix panel with organic light emitting field effect transistor 査読

    Y. Oku, N. Shimoji, T. Tanabe, S. Akiyama, T. Oyamada, H. Uchiuzou, C. Adachi, K. Matsushige

    IDW '06: PROCEEDINGS OF THE 13TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3   667 - +   2006年6月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We successfully demonstrated a novel active-matrix panel having an organic light-emitting field-effect transistor (OLEFET) on a Si substrate. An OLEFET, a switching transistor, and a capacitor were integrated into each pixel. As an OLEFET material, tetraphenylpyrene (TPPy) doped with rubrene at 1wt&#37; was employed. The switching transistor was fabricated with pentacene. All organic transistors are bottom-contact-type, using conventional photolithography. An W display panel clearly showed moving characters.

  • Spin-relaxation Process of Excited Triplet States of Ir(ppy)3 国際誌

    Kenichi Goushi, Jason Brooks, Julie. J. Brown, Hiroyuki Sasabe, and Chihaya Adachi

    J. Photopolymer Sci. & Tech.   2006年5月

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    記述言語:英語  

  • Unusual photoluminescence characteristics of tetraphenylpyrene (TPPy) in various aggregated morphologies 査読

    T Oyamada, S Akiyama, M Yahiro, M Saigou, M Shiro, H Sasabe, C Adachi

    CHEMICAL PHYSICS LETTERS   421 ( 1-3 )   295 - 299   2006年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We found that 1,3,6,8-tetraphenylpyrene (TPPy) demonstrates unusual photoluminescence (PL) characteristics in the solid-state morphologies. We investigated the PL characteristics of TPPy in various morphologies including powder, deposited film, and solutions. The TPPy powder (A), which was prepared through column chromatography, recrystallization, and train sublimation, showed blue fluorescence with a peak of maximum wavelength of = 451 nm. The TPPy powder (B), which was obtained by thermal annealing of TPPy powder (A) in a quartz tube in nitrogen, showed green fluorescence with gimel(max) = 510 nm. Furthermore, the TPPy powder (B) was reversibly converted into TPPy powder (A) by recrystallization. We conclude that TPPy dimers form locally in the TPPy monomer aggregates during thermal annealing and redissociate into the monomer states during recrystallization. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2005.12.102

  • Estimation of carrier recombination and electroluminescence emission regions in organic light-emitting field-effect transistors using local doping method 国際誌

    Takahito Oyamada, Hiroyuki Sasabe, Yoshiaki Oku , Noriyuki Shimoji, and Chihaya Adachi

    Appl. Phys. Lett.   2006年3月

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    記述言語:英語  

  • Preparation of micropatterned organic light emitting diodes by self-organization 査読

    O Karthaus, C Adachi, S Arakaki, A Endo, T Wada

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   444   87 - 94   2006年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A dewetting process of an evaporating solution is used to form micrometer-sized amorphous droplets, or domes, of the low molar mass solute on substrates such as silicon, mica, glass, and indium-tin-oxide. Using dewetting, the organic hole transporting material of organic light emitting diodes was patterened into micrometer-sized domes on an indium-tin-oxide electrode. Annealing led to a structural change of the domes, which was investigated by optical and electron microscopes. The dewetted dome samples were then coated with electron transport material and top electrode to give functioning organic light emitting diodes devices.

    DOI: 10.1080/15421400500365227

  • Estimation of carrier recombination and electroluminescence emission regions in organic light-emitting field-effect transistors using local doping method 査読

    T Oyamada, H Sasabe, Y Oku, N Shimoji, C Adachi

    APPLIED PHYSICS LETTERS   88 ( 9 )   2006年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To elucidate the electroluminescence (EL) mechanism of organic light-emitting field-effect transistors (OLEFETs), we determined the carrier recombination and EL emission regions using the local doping method. We demonstrated that the local doping method is a useful technique for estimating the width of these regions in OLEFETs. We inserted an ultrathin rubrene doped 1,3,6,8-tetraphenylpyrene (TPPy) layer (d=10 nm) as a sensing layer in a TPPy layer (80 nm) and measured the luminance-drain current-drain voltage characteristics and the EL spectra depending on the position of the sensing layer. We confirmed that the EL emission region expanded almost to the height (h similar or equal to 40 nm) of the source-drain electrodes and was independent of the gate bias voltage (V-g). Further, we observed that the EL external quantum efficiency (eta(ext)) significantly decreased as V-g increased, suggesting that excitons generated in a TPPy host layer by carrier recombination are quenched by the application of V-g.

    DOI: 10.1063/1.2181629

  • Low-damage indium tin oxide formation on organic dyers using unique cylindrical sputtering module and application in transparent organic light-emitting diodes 査読

    H Yamamoto, T Oyamada, W Hale, S Aoshima, H Sasabe, C Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   45 ( 4-7 )   L213 - L216   2006年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate a low-damage technique for forming an indium tin oxide (ITO) layer on an organic layer by using a unique cylindrical sputtering module and the fabrication of high-performance transparent organic light-emitting diodes (TOLEDs). The ITO target has an off-axis alignment to the substrate, and it confines plasma to the inside of the module, thereby forming ITO with little damage to the underlying organic layers. We found that the composition ratio of In 203 (90&#37;) and SnO2 (10&#37;) in the deposited film is the same as the target composition ratio, and that the composition ratio distribution was spatially uniform, showing no angular dependence. We fabricated an ITO [110nm]/4,4'-bis[N(1-naphthyl)-N-phenyl-amino]biphenyl (alpha-NPD) [50 nm]/tris-(8-hydroxy-quinoline)aluminum (Alq(3)) [30 nm]/Cs:phenyldipyrenylphosphine oxide (POPy2) [20 nm]/ ITO [100nm] device, using a cylindrical target for the top ITO cathode fabrication. The device showed excellent J-V characteristics, with a current density of J = 883 mA/cm(2) at an applied voltage of 10V and a maximum external quantum efficiency of eta(ext) = 0.76&#37;.

    DOI: 10.1143/JJAP.45.L213

  • 発光型有機FET

    安達千波矢

    Molecular Electronics & Bioelectronics   2006年2月

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    記述言語:日本語  

  • Low-Damage Indium Tin Oxide Formation on Organic Layers Using Unique Cylindrical Sputtering Module and Application in Transparent Organic Light-Emitting Diodes 国際誌

    Hidetoshi Yamamoto, Takahito Oyamada, William Hale, Shoichi Aoshima, Hiroyuki Sasabe, and Chihaya Adachi

    Jpn. J. Appl. Phys.   2006年2月

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    記述言語:英語  

  • Unusual photoluminescence characteristics of tetraphenylpyrene (TPPy) in various aggregated morphologies 国際誌

    Takahito Oyamada, Seiji Akiyama, Masayuki Yahiro, Mari Saigou, Motoo Shiro, Hiroyuki Sasabe, and Chihaya Adachi

    Chem. Phys. Lett.   2006年2月

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    記述言語:英語  

  • Intermolecular interaction and a concentration-quenching mechanism of phosphorescent Ir(III) complexes in a solid film 査読

    Y Kawamura, J Brooks, JJ Brown, H Sasabe, C Adachi

    PHYSICAL REVIEW LETTERS   96 ( 1 )   017404   2006年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Solid-state self-quenching processes of highly efficient Ir(III) phosphorescent emitters are investigated by the measurement of thin film photoluminescence quantum efficiency and transient lifetime as a function of doping concentration in a host matrix. The radiative decay rate constant is found to be independent from the average distance between dopant molecules (R), and the concentration-quenching rate constant is shown to be dependent on R-6. The quenching dependence on R strongly suggests that luminescent concentration quenching in a phosphorescent Ir(III) complex:host film is controlled by dipole-dipole deactivating interactions as described by the Forster energy transfer model.

    DOI: 10.1103/PhysRevLett.96.017404

  • Carrier injection and transport characteristics of copper phthalocyanine thin films under low to extremely high current densities 査読

    T Matsushima, H Sasabe, C Adachi

    APPLIED PHYSICS LETTERS   88 ( 3 )   2006年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We investigated current density-voltage (J-V) characteristics of copper phthalocyanine (CuPc) thin films depending on active device areas. We prepared CuPc thin-film devices with active areas smaller than S=625 mu m(2) using a photolithography technique. The maximum breakdown current density (J(MAX)) and voltage (V-MAX) of the devices markedly increased as the active area was decreased from S=625 to 7.9 mu m(2). In the smallest device, with S=7.9 mu m(2), we obtained not only an extremely high current density of J(MAX)=128 kA/cm(2) at V-MAX=9.2 V, but also unique J-V characteristics, indicating that the carrier conduction process shifted from the Fowler-Nordheim tunneling injection mechanism to shallow-trap and trap-free space-charge-limited current mechanisms.

    DOI: 10.1063/1.2165197

  • Carrier injection and transport characteristics of copper phthalocyanine thin films under low to extremely high current densities 国際誌

    Toshinori Matsushima, Hiroyuki Sasabe, and Chihaya Adachi

    Appl. Phys. Lett.   2006年1月

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    記述言語:英語  

  • Preparation of Micropatterned Organic Light Emitting Diodes by Self-Organization 国際誌

    O. Karthaus, C. Adachi, S. Arakaki, A. Endo and T. Wada

    Molecular Crystals and Liquid Crystals   2006年1月

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    記述言語:英語  

  • Intermolecular Interaction and a Concentration-Quenching Mechanism of Phosphorescent Ir(III) Complexes in a Solid Film 国際誌

    Yuichiro Kawamura, Jason Brooks, Julie J. Brown, H. Sasabe, and C. Adachi

    Phys. Rev. Lett.   2006年1月

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    記述言語:英語  

  • Organic light-emitting transistor - Fundamental characteristics and applications 査読

    Chihaya Adachi, Takahito Oyamada

    IDW/AD '05: PROCEEDINGS OF THE 12TH INTERNATIONAL DISPLAY WORKSHOPS IN CONJUNCTION WITH ASIA DISPLAY 2005, VOLS 1 AND 2   1033 - 1036   2005年12月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We succeeded in observing bright electroluminescence (EL) from 1wt&#37;-rubrene doped tetraphenylpyrene (TPPy) as an active layer in an organic field-effect transistor (OFET) structure. We observed a maximum EL quantum efficiency (eta(ext)) of similar to 0.5 &#37; with a Cr/Au source-drain electrode. From the OFET characteristics, although the 1wt&#37;-rubrene:TPPy co-deposited layer demonstrated typical p-type operation, the occurrence of EL clearly indicated occurrence of simultaneous hole and electron injections from the source and drain electrodes, respectively. This device configuration provides novel organic light emitting diode structure where anode (source) and cathode (drain) electrodes are laterally arranged, giving us a chance to control drain current by changing gate bias.

  • Low lasing threshold in organic distributed feedback solid state lasers using bisstyrylbenzene derivative as active material 査読

    Hajime Nakanotani, Hiroyuki Sasabe, Chihaya Adachi

    Proceedings of SPIE - The International Society for Optical Engineering   5937   1 - 7   2005年12月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We demonstrate very low threshold laser oscillation (Eth= 0.78 ±0.5 μJ/cm2) from an organic semiconductor thin film employing 2,5-bis(p-(N-phenyl-N-(m-tolyl)amino)styryl)benzene (BSB-Me) as an active gain medium equipped with a second order distributed feedback resonator. Further, we demonstrate laser oscillation under optical excitation from an organic light emitting device equipped with transparent ITO hole and electron injection electrodes. In addition, we demonstrate injection and transport of high current density over J &gt
    500 A/cm2 in an organic light emitting diode using highly thermal conductive substrates and a small electrode under short pulse voltage excitation.

    DOI: 10.1117/12.629383

  • Lateral organic light-emitting diode with field-effect transistor characteristics 査読

    T Oyamada, H Uchiuzou, S Akiyama, Y Oku, N Shimoji, K Matsushige, H Sasabe, C Adachi

    JOURNAL OF APPLIED PHYSICS   98 ( 7 )   2005年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We succeeded in observing bright electroluminescence (EL) from 1 wt &#37;-rubrene doped tetraphenylpyrene (TPPy) as an active layer in a lateral organic light-emitting diode structure that allowed field-effect transistor operation. This device configuration provides an organic light-emitting diode structure where the anode (source) and cathode (drain) electrodes are laterally arranged, providing us a chance to control the EL intensity by changing the gate bias. We demonstrated that TPPy provides compatible transistor and EL characteristics. Further, not only rubrene doping into the TPPy host but also adjusting the source-drain channel length significantly improved the EL characteristics. We observed a maximum EL quantum efficiency (eta(ext)) of similar to 0.5&#37; with a Cr/Au source (S)-drain (D) electrode and a slightly higher eta(ext) of similar to 0.8&#37; with S-D electrodes of MgAu/Au, Al/Au, Cr/YAu/Au, and MgAl/Au multilayers, aiming for simultaneous hole and electron injection. (c) 2005 American Institute of Physics.

    DOI: 10.1063/1.2060932

  • Blue-to-red electroluminescence from organic light-emitting field-effect transistor using various organic semiconductor materials 査読

    T Oyamada, H Uchiuzou, H Sasabe, C Adachi

    JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY   13 ( 10 )   869 - 873   2005年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We succeeded in observing visible bright electroluminescence from blue to red in an organic field-effect-transistor structure. In particular, tetraphenylpyrene (TPPy) demonstrated a high photoluminescence efficiency of phi(PL)similar to 70&#37; and a maximum electroluminescence efficiency of eta(EL)similar to 10(-2)&#37;. The electroluminescence efficiency (eta(EL)) was enhanced by using a short source-to-drain channel length (L-SD < 1 mu m). In addition, doping the TPPy layer with highly fluorescent rubrene molecules led to an phi(PL) of similar to 100&#37; and a maximum eta(EL) of 0.8&#37;.

    DOI: 10.1889/1.2121072

  • Lateral organic light-emitting diode with field-effect transistor characteristics 国際誌

    Takahito Oyamada, Hiroyuki Uchiuzo, Seiji Akiyama, Yoshiaki Oku, Noriyuki Shimoji, Kazumi Matsushige, Hiroyuki Sasabe, and Chihaya Adachi

    J. Appl. Phys.   2005年10月

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    記述言語:英語  

  • Phosphorescence quantum efficiency and intermolecular interaction of Iridium(III) complexes in co-deposited films with organic semiconducting hosts 査読

    Y Kawamura, K Goushi, J Brooks, JJ Brown, H Sasabe, C Adachi

    Organic and Nanocomposite Optical Materials   846   73 - 78   2005年8月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We accurately measured the absolute photoluminescence (PL) quantum efficiency (eta(PL)) Of organic solid-state thin films by using an integrating sphere. We measured the eta(PL) Of conventional organic materials used in organic light emitting diodes, such as a tris (8-quinolionolato)aluminum(III) complex (Alq(3)), and a phosphorescent 1.5mol&#37;-fac-tris(2-phenylpyridyl)iridium(III):4,4'-bis(carbazol-9-yl)-2,2'-biphenyl [Ir(ppy)(3):CBP] co-deposited film. Alq(3) and lr(ppy)(3):CBP showed a eta(PL) = 20 +/- 1&#37; and 97 +/- 2&#37;, which corresponded well to external electroluminescence efficiency using these materials. We also measured red emitting bis[2-(2'-benzothienyl)pyridinato-N,C-3'] (acetylacetonato) iridium(III) [BtP(2)Ir(acac)] with CBP, and the blue complex, bis[(4,6-difluorophenyl)pyridinato -N, C-2](picolinato)iridium(III)[FIrpic], with m-bis(N-carbazolyl)benzene. The maximum eta(PL) values for BtP(2)Ir(acac), and FIrpic were 51 +/- 1 &#37; (at 1.4mol&#37;), and 99 +/- 1&#37; (1.2mol&#37;), respectively. These results suggest that the TIEL of red phosphorescent OLEDs using BtP(2)Ir(acac) as the dopant can be as high as 10&#37;, and blue devices using FIrpic can reach the theoretical limit of 20&#37;.

  • Phosphorescence decay mechanism of Ir(ppy)(3) in a solid matrix 査読

    K Goushi, H Sasabe, C Adachi

    JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY   18 ( 1 )   47 - 50   2005年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The phosphorescence intensities of the green phosphor fac tris(2-phenylpyridine) iridium [Ir(ppy)(3)] in a polymethylmethacrylate [PMMA] host matrix are independent of temperature, while the phosphorescence lifetimes increase significantly at temperatures below T similar to 50 K. In this paper, we propose a phosphorescence decay mechanism for Ir(ppy)(3) to rationalize the characteristic temperature dependence of the transient phosphorescence. By comparing a numerical model with the experimental data, we demonstrate that mutual energy transfer between the sub-levels of triplet states can explain the characteristic temperature dependence.

    DOI: 10.2494/photopolymer.18.47

  • Formation of MgAu alloy cathode by photolithography and its application to organic light-emitting diodes and organic field effect transistors 査読

    T Oyamada, H Sasabe, C Adachi

    ELECTRICAL ENGINEERING IN JAPAN   152 ( 1 )   37 - 42   2005年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To make an efficient electron injection electrode by photolithography, we studied MgAu alloy electrodes, which have a low work function and high resistance to humidity and oxygen. The measured work function of MgAu alloy thin film was 3.7 eV, which is comparable with that of a pure Mg layer and ~0.8 eV lower than that of a pure Au layer. This low work function was maintained even after photolithography, suggesting excellent stability for solvent treatment. Investigating organic field-effect transistor (OFET) characteristics when MgAu alloy comb type source and drain electrodes were used, we successfully obtained n-type FET operation. Furthermore, organic light-emitting diodes (OLEDs) demonstrated the efficient electron injection characteristics of the MgAu alloy cathode, which were similar to those of the conventional MgAg cathode. 2005 Wiley Periodicals, Inc.

    DOI: 10.1002/eej.20153

  • Injection and transport of high current density over 1000A/cm(2) in organic light emitting diodes under pulse excitation 査読

    H Nakanotani, T Oyamada, Y Kawamura, H Sasabe, C Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   44 ( 6A )   3659 - 3662   2005年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We succeeded in injecting and transporting a maximum high current density of J = 1163 A/cm(2) in organic light-emitting diodes using short-pulse excitation combined with a highly thermally conductive silicon substrate (thermal conductivity: 148W m(-1) K-1) and a small cathode configuration (cathode radius r = 50 pm). A maximum current density almost 20 times higher than that associated with direct current (DC) operation was observed by driving an OLED with a short pulse voltage. With short-pulse excitation, the decrease in external quantum efficiency. (eta(ext)) obeyed a typical singlet-singlet exciton annihilation model well, indicating that the generation of Joule heat in OLEDs can be suppressed under pulse operation.

    DOI: 10.1143/JJAP.44.3659

  • Injection and Transport of High Current Density over 1000 A/cm2 in Organic Light Emitting Diodes under Pulse Excitation 国際誌

    H. Nakanotani, T. Oyamada, Y. Kawamura, H. Sasabe, and C. Adachi

    Jpn. J. Appl. Phys.   2005年6月

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    記述言語:英語  

  • Dewetting-induced self-organisation of nano-and microstructures for optoelectronic applications 査読

    O Karthaus, C Adachi, S Arakaki, A Endo, T Wada

    Smart Materials III   5648   251 - 255   2005年5月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    A dewetting process of an evaporating solution is used to form micrometer-sized amorphous droplets, or domes, of the low molar mass solute on substrates such as silicon, mica, glass, and indium-tin-oxide. Using dewetting, the organic hole transporting material of organic light emitting diodes was patterened into micrometer-sized domes on an indium-tinoxide electrode. Annealing led to a structural change of the domes, which was investigated by optical and electron microscopies. The dewetted dome samples were then coated with electron transport material and top electrode to give functioning organic light emitting diodes. Microscope imaging reveals a strong luminescence from the micrometer-sized domes.

    DOI: 10.1117/12.581911

  • Singlet-singlet and singlet-heat annihilations in fluorescence-based organic light-emitting diodes under steady-state high current density 査読

    H Nakanotani, H Sasabe, C Adachi

    APPLIED PHYSICS LETTERS   86 ( 21 )   2005年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We observed a significant decrease in electroluminescence (EL) in the high-current-density region (J&GT; 1 A/cm(2)) in organic light-emitting diodes (OLEDs). The decreased external quantum efficiency (&eta;(ext)) in an OLED with a cathode diameter of d=50 &mu; m was in excellent agreement with the singlet-singlet annihilation (SSA) model. In contrast, the decreased &eta;(ext) in an OLED with a cathode diameter of d=1000 &mu; m coincided well with the singlet-heat annihilation (SHA) model. These results suggest that large OLEDs generate significant Joule heat, which causes additional exciton dissociation in addition to SSA. We also used a very thermally conductive sapphire substrate (46 k/Wm(-1) K-1) combined with a small cathode diameter of 50 &mu; m in an OLED to alleviate the &eta;(ext) roll off characteristics and achieved injection at a much higher current density. With this device configuration, a maximum current density of J(max)=447 A/cm(2) was achieved. However, decreased &eta;(ext) based on SHA was observed in the high current region, indicating that significant Joule heat was generated under a few hundred A/cm(2) that induced additional exciton dissociation even when the sapphire substrate was used. &COPY; 2005 American Institute of Physics.

    DOI: 10.1063/1.1939075

  • Phosphorescence Decay Mechanism of Ir(ppy)3 in a Solid Matrix 国際誌

    K. Goushi, H. Sasabe, and C. Adachi

    J. Photopolymer Sci. & Tech.   2005年5月

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    記述言語:英語  

  • Singlet-singlet and singlet-heat annihilations in fluorescence-based organic light-emitting diodes under steady-state high current density 国際誌

    H. Nakanotani, H. Sasabe, and C. Adachi

    Appl. Phys. Lett.   2005年5月

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    記述言語:英語  

  • Organic light-emitting transistors 査読

    Takahito Oyamada, Hiroyuki Uchiuzo, Noriyuki Shimoji, Kazumi Matsushige, Hiroyuki Sasabe, Chihaya Adachi

    IDMC 05: PROCEEDINGS OF THE INTERNATIONAL DISPLAY MANUFACTURING CONFERENCE 2005   269 - 270   2005年2月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We succeeded in observing electroluminescence (EL) of Tetraphenulpyrene (TPPy) as an active layer in an organic field-effect transitor (OFET). In particular, an OFET with a short channel of dSD<1.0 mu m demonstrated higher EL efficiency than one with a much longer channel (dSD<10 mu m). We observed a maximum EL quantum efficiency (nmax) of similar to 0.3&#37; in the short-channel-length device at an applied source-drain voltage of Vd similar to 100 V and a gate voltage of Vg > -50 V. From the OFET characteristics, although the TPPy layer demonstrated typical p-type operation, the occurence of EL clearly indicated simultaneous hole and electron injection from the source and drain electronics, respectively under high Vd and Vg.

  • 100&#37; fluorescence efficiency of 4,4 '-bis[(N-carbazole)styryl]biphenyl in a solid film and the very low amplified spontaneous emission threshold 査読

    T Aimono, Y Kawamura, K Goushi, H Yamamoto, H Sasabe, C Adachi

    APPLIED PHYSICS LETTERS   86 ( 7 )   2005年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We examined the amplified spontaneous emission (ASE) characteristics of fluorescent styryl benzene derivatives doped into a 4,4'-di(N-carbazolyl)biphenyl (CBP) host. In particular, 4,4'-bis[(N-carbazole)styryl]biphenyl (BSB-Cz) demonstrated an extremely low ASE threshold of E-th = 0.32 +/- 0.05 muJ/cm(2). We observed that the 6 wt &#37;-BSB-Cz:CBP film has an ultimate photoluminescence (PL) quantum efficiency of Phi(PL) = 100&#37; and a short transient lifetime of tau(f) = 1.0 +/- 0.1 ns, leading to a large radiative decay rate of k(r) = 1 x 10(9) s(-1). We demonstrated that the extremely low ASE threshold originated from the large radiative decay rate of BSB-Cz. (C) 2005 American Institute of Physics.

    DOI: 10.1063/1.1867555

  • 100&#37; phosphorescence quantum efficiency of Ir(III) complexes in organic semiconductor films 査読

    Y Kawamura, K Goushi, J Brooks, JJ Brown, H Sasabe, C Adachi

    APPLIED PHYSICS LETTERS   86 ( 7 )   2005年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate that three Ir(III) complexes used as principal dopants in organic electrophosphorescent diodes have very high photoluminescence quantum efficiency (eta(PL)) in a solid-state film. The green emitting complex, fac-tris(2-phenylpyridinato)iridium(III) [Ir(ppy)(3)], the red-emitting bis[2-(2'-benzothienyl)pyridinato-N,C-3'] (acetylacetonato)iridium(III) [Btp(2)Ir(acac)], and the blue complex bis[(4,6-difluorophenyl)pyridinato-N, C-2](picolinato)iridium(III) (FIrpic) were prepared as codeposited films of varying concentration with 4,4'-bis(N-carbazolyl)-2, 2'-biphenyl, a commonly used host material. The maximum eta(PL) values for Ir(ppy)3, Btp(2)Ir(acac), and FIrpic were, respectively, 97&#37; +/- 2&#37; (at 1.5 mol&#37;), 51&#37; +/- 1&#37; (at 1.4 mol&#37;), and 78&#37; +/- 1&#37; (at 15 mol&#37;). Furthermore, we also observed that the maximum eta(PL) of FIrpic reached 99&#37; +/- 1&#37; when doped into the high triplet energy host, m-bis(N-carbazolyl)benzene, at an optimal concentration of 1.2 mol&#37;. (C) 2005 American Institute of Physics.

    DOI: 10.1063/1.1862777

  • Electroluminescence of 2,4-bis(4-(2 '-thiophene-yl)phenyl)thiophene in organic light-emitting field-effect transistors 査読

    T Oyamada, H Sasabe, C Adachi, S Okuyama, N Shimoji, K Matsushige

    APPLIED PHYSICS LETTERS   86 ( 9 )   2005年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We succeeded in observing electroluminescence (EL) of 2,4-bis(4-(2'-thiophene-yl)phenyl)thiophene (TPTPT) as an active layer in an organic field-effect transistor (OFET). In particular, an OFET with a short channel of d(SD)=0.8 mu m demonstrated higher EL efficiency than one with a much longer channel (d(SD)=9.8 mu m). We observed a maximum EL quantum efficiency (eta(max)) of 6.4 x 10(-3) &#37; in the short-channel-length device at an applied source-drain voltage of V-d=-100 V and a gate voltage of V-g=-40 V. From the OFET characteristics, although the TPTPT layer demonstrated typical p-type operation, the occurrence of EL clearly indicated simultaneous hole and electron injection from the source and drain electronics, respectively, under high V-d and V-g. (C) 2005 American Institute of Physics.

    DOI: 10.1063/1.1870105

  • Erratum: Simple accurate system for measuring absolute photoluminescence quantum efficiency in organic solid-state thin films (Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers (2004) 43 (7729)) 査読

    Yuichiro Kawamura, Hiroyuki Sasabe, Chihaya Adachi

    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers   44 ( 2 )   1160   2005年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1143/JJAP.44.1160

  • Extremely-high-density carrier injection and transport over 12000 A/cm(2) into organic thin films 査読

    H Yamamoto, H Kasajima, W Yokoyama, H Sasabe, C Adachi

    APPLIED PHYSICS LETTERS   86 ( 8 )   2005年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We achieved extremely-high-density steady state carrier injection and transport at over similar to 10000 A/cm(2) into organic thin films using high thermally conductive substrates, which suppress the temperature rise inside the devices by transferring the joule heat into the substrates. Using a silicon substrate with a high thermal conductivity of 148 W/mK and a small size cathode with a radius of r = 25 mu m, we achieved a maximum current density of J(max) = 12222A/cm(2) and power density of P-max similar to 10(5) W/cm(2) in an ITO(110 nm)/copper phthalocyanine (CuPc) (25 nm)/MgAg(100 nm)/Ag(10 nm) device during a fraction of a second under direct current sweep. Further, we also achieved J(max) = 514 A/cm(2) in a conventional organic light-emitting diode structure using the same techniques. In the CuPc based devices, we observed characteristic current density (J)-voltage (V) behavior, indicating that the J-V characteristics are controlled by the trap-free space-charge-limited cur-rents in the high current region, and by the trapped-charge-limited current in the low current region. (c) 2005 American Institute of Physics.

    DOI: 10.1063/1.1866230

  • Blue-to-red electroluminescence from organic light-emitting field-effect transistor using various organic semiconductor materials 国際誌

    Takahito Oyamada, Hiroyuki Uchiuzo, Hiroyuki Sasabe and Chihaya Adachi

    J. SID   2005年2月

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    記述言語:英語  

  • 100% phosphorescence quantum efficiency of Ir(III) complexes in organic semiconductor films 国際誌

    Y. Kawamura, K. Goushi, J. Brooks, J. J. Brown, H. Sasabe and C. Adachi

    Appl. Phys. Lett.   2005年2月

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    記述言語:英語  

  • Extremely-high-density carrier injection and transport over 12000A/cm2 into organic thin films 国際誌

    H. Yamamoto, H. Kasajima, W. Yokoyama, H. Sasabe, and C. Adachi

    Appl. Phys. Lett.   2005年2月

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    記述言語:英語  

  • 100% fluorescence efficiency of 4,4’-bis[(N-carbazole)styryl]biphenyl in a solid film and the very low amplified spontaneous emission threshold 国際誌

    T. Aimono, Y. Kawamura, K. Goushi, H. Yamamoto, H. Sasabe, and C. Adachi

    Appl. Phys. Lett.   2005年2月

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    記述言語:英語  

  • Electroluminescence of 2,4-bis(4-(2’-thiophene-yl)phenyl)thiophene in organic light-emitting field-effect transistors 国際誌

    T. Oyamada, H. Sasabe, C. Adachi, S. Okuyama, N. Shimoji, and K. Matsushige

    Appl. Phys. Lett.   2005年2月

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    記述言語:英語  

  • High-efficiency carrier injection characteristics of dixanthene derivatives in organic light-emitting diodes 査読

    M Yoshida, T Tsuchida, T Kurata, M Ikeda, H Sasabe, C Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   44 ( 1A )   410 - 411   2005年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate that benzo[1,2,3-kl:4,5,6-k'l']dixanthene (BDX) derivatives show high-efficiency carrier injection in organic light-emitting diodes (OLEDs); Using 3,11-dibromobenzo[1,2,3-kl:4,5,6-k'l']dixanthene (BDX6) as a hole injection layer (HIL), we achieved a low driving voltage of 8.12 +/- 0.10V in obtaining a current density of J = 100mA/cm(2). the hole injection characteristics were superior to those of a device with a conventional CuPc layer as a HIL. On the other hand, inserting benzo[1,2,3-kl:4,5,6-k'l']dixanthene (BDX1) as an electron injection layer (EIL) efficiently decreased driving voltage, indicating a superior electron injection capability compared with a device without a BDX1 ElL. We show that carrier injection efficiency can be well controlled by the substituent groups of BDX, thus providing efficient hole and electron injection layers.

    DOI: 10.1143/JJAP.44.410

  • Extremely low-voltage driving of organic light-emitting diodes with a Cs-doped phenyldipyrenylphosphine oxide layer as an electron-injection layer 査読

    T Oyamada, H Sasabe, C Adachi, S Murase, T Tominaga, C Maeda

    APPLIED PHYSICS LETTERS   86 ( 3 )   2005年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrated efficient electron injection and transport in organic light-emitting diodes using an electron-transport layer (ETL) composed of a Cs and phenyldipyrenylphosphine oxide (POPy2) co-deposited layer. In particular, an ETL composed of a CS: POPy2 layer with an atom:molar ratio of 1:2 demonstrated an extremely low driving voltage, resulting in a high current density of 100 mA/cm(2) at an applied voltage of only 3.9 V The results of Kelvin probe and absorption measurements indicated that the formation of a CsAI alloy layer at the CS: POPy2/Al cathode interface and the charge-transfer complex between the Cs and POPy2 contributed to enhancing the efficiency of electron injection and transport, respectively. (C) 2005 American Institute of Physics.

    DOI: 10.1063/1.1852707

  • Extremely low-voltage driving of organic light-emitting diodes with a Cs-doped phenyldipyrenylphosphine oxide layer as an electron-injection layer 国際誌

    T. Oyamada, H. Sasabe, C. Adachi, S. Murase, T. Tominaga, and C. Maeda

    Appl. Phys. Lett.   2005年1月

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    記述言語:英語  

  • High-Efficiency Carrier Injection Characteristics of Dixanthene Derivatives in Organic Light- Emitting Diodes 国際誌

    M. Yoshida, T. Tsuchida, T. Kurata, M. Ikeda, H. Sasabe, and C. Adachi

    Jpn. J. Appl. Phys.   2005年1月

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    記述言語:英語  

  • Simple accurate system for measuring absolute photoluminescence quantum efficiency in organic solid-state thin films 査読

    Y Kawamura, H Sasabe, C Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   43 ( 11A )   7729 - 7730   2004年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We accurately measured the absolute photoluminescence (PL) quantum efficiency (eta(PL)) of organic solid-state thin films using an integrating sphere. We particularly measured the eta(PL) of conventional organic materials used in organic light emitting. diodes, such as a tris(8-quinolionolato)aluminum(III) complex (Alq(3)), and a 2 wt&#37;-fac-tris(2-phenylpyridyl)iridium(III): 4,4'-bis(carbazol-9-yl)-2,2'-biphenyl [Ir(ppy)(3):CBP] co-deposited film. Alq(3) and Ir(ppy)(3):CBP showed a eta(PL) = 20 +/- 1&#37; and 97 +/- 2&#37;, which corresponded well to external electroluminescence efficiency using these materials. We also measured their transient PL decay and determined the radiative rate constants with their eta(PL).

    DOI: 10.1143/JJAP.43.7729

  • Simple Accurate System for Measuring Absolute Photoluminescence Quantum Efficiency in Organic Solid-State Thin Films 国際誌

    Y. Kawamura, H. Sasabe, and C. Adachi

    Jpn. J. Appl. Phys.   2004年11月

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    記述言語:英語  

  • 複数のリン光発光層を含有する白色発光デバイス

    安藤暢宏,河村祐一郎,Julie. J. Brown,雀部博之,安達千波矢

    電気学会論文誌A   2004年11月

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    記述言語:日本語  

  • High Efficiency White Electrophosphorescence Mechanism with Two Phosphorescent Dopants 査読

    Yoshiro Sato, Kenichi Goushi, Hiroyuki Sasabe, Chihaya Adachi, Kenichi Goushi, Hiroyuki Sasabe, Masami Saito, Chihaya Adachi, Julie J. Brown

    The transactions of the Institute of Electrical Engineers of Japan.A   124 ( 5 )   414 - 420   2004年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    High efficiency white organic light emitting diodes (WOLED) have been expected for applications of lighting, illumination and back-light sources for LCD. Recently, since organic phosphors demonstrated very high electroluminescence (EL) quantum efficiency of ∼100&#37;, high efficiency WOLED with the organic phosphors has been anticipated. In this study, we employed an emitter layer which is doped with blue and red phosphorescence molecules. In our optimized device structure, we obtained maximum EL quantum efficiency of 4&#37;. However, the shapes of the EL spectrum were strongly dependent on current density. With analysis of exciton decay process under optical and electrical excitations, we conclude that triplet-triplet annihilation occurs in blue and red phosphors independently, resulted in a significant change of the EL spectrum. Thus, the coincidence of the lifetimes of the blue and red phosphors is indispensable to escape change of EL spectrum with current density. © 2004, The Institute of Electrical Engineers of Japan. All rights reserved.

    DOI: 10.1541/ieejfms.124.414

  • Electroluminescence as a probe for elucidating electrical conductivity in a deoxyribonucleic acid-cetyltrimethylammonium lipid complex layer 国際誌

    K. Hirata, T. Oyamada, T. Imai, H. Sasabe, C. Adachi, and T. Koyama

    Appl. Phys. Lett.   2004年8月

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    記述言語:英語  

  • Synthesis and characterization of hexakis(4-pyridylethynyl)benzene and hexakis(5-pyrimidylethynyl)benzene 査読

    M Ohkita, C Adachi, M Kawano, T Suzuki

    HETEROCYCLES   63 ( 7 )   1537 - 1540   2004年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Two new members of snowflake-shaped carbon-rich molecules possessing nitrogen-heterocycles as functional end groups, hexakis(4-pyridylethynyl)benzene (1) and hexakis(5-pyrimidylethynyl)benzene (2), have been prepared by six-fold Sonogashira cross-coupling reaction of hexabromobenzene with 4-ethynylpyridine and 5-ethynylpyrimidine, respectively.

  • Formation of europium chelate complexes by vacuum co-deposition and their application in organic light-emitting diodes 査読

    T Oyamada, Y Kawamura, T Koyama, H Sasabe, C Adachi

    ADVANCED MATERIALS   16 ( 13 )   1082 - +   2004年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Europium (Eu) rare-earth complexes, which show intense red photoluminescence (PL) resulting from the f-f transition of Eu 31 ions after the harvesting of both singlet and triplet excitons produced on the surrounding ligands, have been attracting a lot of attention as light-emitting materials for organic light-emitting diodes (OLEDs).([1-28]) Research on the use of Eu complexes to fabricate OLEDs began in 1991 by Kido and colleagues.([1]) An OLED with an emitting layer (EML) made of a Eu(TTA)(3) (TAA: thenoyltrifluoroacetonato) film doped into a poly(methylphenylsilane) (PMPS) host demonstrated a maximum external quantum efficiency (eta(ext)) of 0.01&#37;. In 1994, Tsutsui et al.([3]) reported a eta(ext) of 0.3&#37; obtained with Eu(TTA)(3)phen (phen: 1,10-phenanthroline) used as an EML. Kido et al.([2]) also obtained a eta(ext) of 0.5&#37; with an OLED with a Eu(DBM)(3)phen (DBM: dibenzoylmethanato):2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) (1:3) codeposited film as an EML. Recently, Adachi et al.([15]) reported a eta(ext) of 1.29&#37; obtained with a 1 wt.-&#37; Eu(TTA)(3)phen film doped into a wide-energy-gap 4,4'-N,N'-dicarbazole-biphenyl (CBP) host used as an EML. Most recently, Noto et al.([20]) obtained a eta(ext) of 3.5 &#37; with a 10 wt.-&#37; Eu(DCNP)(DBM)(2)-phen (DCNP: 1,3-dicyano-1,3-propanedione) film doped into a CBP host, and Liang et al.([16,24]) reported a eta(ext) of 5.7 cd A(-1) obtained at a J of 0.04 mA cm(-2) with a 0.6 wt.-&#37; Eu(DBM)(3)-phen film doped into an N,N'-diphenyl-N,N'-di(m-tolyl)benzidine (TPD) host. The efficiency of OLEDs using Eu complexes has been gradually improving over the past decade, which has sparked further interest in the development of Eu-based OLEDs.

    DOI: 10.1002/adma.20040090

  • Formation of Europium Chelate Complexes by Vacuum Co-Deposition and Their Application in Organic Light-Emitting Diodes 国際誌

    T. Oyamada, Y. Kawamura, T. Koyama, H. Sasabe and C. Adachi

    Adv. Mat.   2004年7月

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    記述言語:英語  

  • Unusual Phosphorescence Characteristics of Ir(ppy)3 in a Solid Matrix at Low Temperatures 国際誌

    K. Goushi, Y. Kawamura, H. Sasabe, and C. Adachi

    Jpn. J. Appl. Phys., (Express Letter)   2004年6月

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    記述言語:英語  

  • Triplet exciton confinement and unconfinement by adjacent hole-transport layers 国際誌

    K. Goushi, R. Kwong, J. J. Brown, H. Sasabe and C. Adachi

    J. Appl. Phys.   2004年6月

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    記述言語:英語  

  • フォトリソグラフィー法によるMgAu合金電極の形成と有機LED・有機FETへの適用

    小山田崇人,雀部博之,安達千波矢

    電気学会論文誌C   2004年6月

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    記述言語:日本語  

    Formation of MgAu Alloy Cathode by Photolithography and Its Application to Organic Light- Emitting Diodes and Organic Field Effect Transistors

  • Synthesis and characterization of hexakis(4-pyridylethynyl)benzene and hexakis(5-pyrimidylethynyl) benzene 国際誌

    M. Ohkita, C. Adachi, M. Kawano, and T. Suzuki

    Heterocycles   2004年5月

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    記述言語:英語  

  • 2つのリン光性ドーパントを含有する白色リン光デバイスの発光機構

    佐藤喜郎,合志憲一,雀部博之,Julie J. Brown,斉藤正美,安達千波矢

    電気学会論文誌A   2004年5月

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    記述言語:日本語  

  • Electroluminescence from self-organized “microdomes” 国際誌

    O. Karthaus, C. Adachi, S. Kurimura, and T. Oyamada

    Appl. Phys. Lett.   2004年5月

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    記述言語:英語  

  • Efficient Electron Injection Characteristics of Triazine Derivatives for Transparent OLEDs (TOLEDs) 国際誌

    T. Oyamada, H. Yoshizaki, H. Sasabe, and C. Adachi

    Chem. Lett.   2004年5月

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    記述言語:英語  

  • Ultraviolet amplified spontaneous emission from thin films of 4,4’-bis(9-carbazolyl)-2,2’-biphenyl and the derivatives 国際誌

    Y. Kawamura, H. Yamamoto, K. Goushi, H. Sasabe and C. Adachi

    Appl. Phys. Lett.   2004年4月

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    記述言語:英語  

  • Organometallic complexes as hole transporting materials in organic light-emitting diodes. 査読

    XF Ren, BD Alleyne, PI Djurovich, Tsyba, I, R Bau, ME Thompson

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   227   U1439 - U1439   2004年3月

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    記述言語:英語  

    DOI: 10.1021/ic035183f

  • High-Efficiency Organic Electrophosphorescent Diodes Using 1, 3, 5-Triazine Electron Transport Materials 国際誌

    H. Inomata, K. Goushi, T. Masuko, T. Konno, T. Imai, H. Sasabe, J. J. Brown and C. Adachi

    Chem. Mat.   2004年3月

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    記述言語:英語  

  • Organometallic Complexes as Hole-Transporting Materials in Organic Light-Emitting Diodes 国際誌

    X. F. Ren, B. D. Alleyne, P. I. Djurovich, C. Adachi, I. Tsyba, R. Bau and M. E. Thompson

    Inorg. Chem.   2004年2月

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    記述言語:英語  

  • Efficient electron injection mechanism in organic light-emitting diodes using an ultra thin layer of low-work-function metals 査読

    T Oyamada, C Maeda, H Sasabe, C Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS   42 ( 12B )   L1535 - L1538   2003年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    To achieve efficient electron injection in organic light-emitting diodes, we examine ultra thin layers (0.50 nm) of the low-work-function metals, Cs (1.9eV), Rb (2.2eV), K (2.3eV), Na (2.4eV), Li (2.9eV), and Ca (2.9eV) capped with aluminum (Al) as a cathode layer. While all the alkali metals show a decrease of driving voltage compared with a single Al cathode, the Cs layer especially shows a significant decrease, and we obtain a high current density of 1.9 A/cm(2) at an applied voltage of only 10V by using this layer. We demonstrate that efficient electron injection is achieved when we use a Cs layer with a thickness of less than 3 nm, although electron injection efficiency abruptly decreases when using a Cs layer thicker than 3 nm. From the Cs thickness dependence of current-voltage characteristics, we conclude that Cs atoms form an alloy layer with aluminum atoms at the organic/Al cathode interface, organic layer/Cs:Al/Al, that significantly enhances electron injection compared with that obtained from bulk Cs layers.

    DOI: 10.1143/JJAP.42.L1535

  • Efficient Electron Injection Mechanism in Organic Light-Emitting Diodes Using an Ultra Thin Layer of Low-Work-Function Metals 国際誌

    T. Oyamada, C. Maeda, H. Sasabe and C. Adachi

    Jpn. J. Appl. Phys.   2003年12月

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    記述言語:英語  

  • Carrier injection and transport of steady-state high current density exceeding 1000 A/cm(2) in organic thin films 査読

    W Yokoyama, H Sasabe, C Adachi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS   42 ( 11B )   L1353 - L1355   2003年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate carrier injection and transport of steady-state high current density into organic thin films. The maximum current density reaches J=1053A/cm(2), the highest ever reported. We employ a 25 nm-thick Copper phthalocyanine (CuPc) thin film sandwiched between an indium-tin-oxide anode and a magnesium-silver alloy cathode with an active electrode dot-size (S) of S=2.0 x 10(-5)cm(2) (radius: r=25mum). We observed that the maximum current density depends on the organic materials used, and the device size and thickness. Decreasing the organic layer thickness significantly changes the current density-voltage (J-V) characteristics, demonstrating that the rate-limiting step of the J-V characteristics changes from the carrier transport process to the carrier injection process. Our achievement of high current density exceeding 1000A/cm(2) in organic thin films is a first step towards the development of organic laser diodes that need extremely high excitation intensity.

    DOI: 10.1143/JJAP.42.L1353

  • Carrier Injection and Transport of Steady-State High Current Density Exceeding 1000A/cm2 in Organic Thin Films 国際誌

    W. Yokoyama, H. Sasabe and C. Adachi

    Jpn. J. Appl. Phys., (Express Letter)   2003年11月

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    記述言語:英語  

  • Switching effect in Cu : TCNQ charge transfer-complex thin films by vacuum codeposition 査読

    T Oyamada, H Tanaka, K Matsushige, H Sasabe, C Adachi

    APPLIED PHYSICS LETTERS   83 ( 6 )   1252 - 1254   2003年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate the operation of an organic switching device using a uniform poly-crystalline Cu:7, 7, 8, 8-Tetracyanoquinodimethane (TCNQ) charge transfer (CT)-complex thin film that is prepared by vacuum vapor codeposition. Characteristic CT-absorption at lambda=600-1200 nm was observed in the complex film in the UV-visible spectrum and the cyano stretching peak in the IR spectrum shifted to a higher (more than 29 cm(-1)) wave number than that of a pristine TCNQ film, suggesting the formation of a CT-complex in the evaporated thin film. Reproducible electrical switching characteristics were observed in the indium tin oxide/Al/(Al2O3)/Cu:TCNQ/Al structure. The device exhibited a clear threshold from low impedance to high impedance at an applied voltage of 10.0+/-2.0 V and a reverse phenomenon at a negative bias of -9.5+/-2.0 V. In this study, we demonstrate that a thin Al2O3 layer between the aluminum (Al) anode and Cu:TCNQ layers creates reproducible switching. (C) 2003 American Institute of Physics.

    DOI: 10.1063/1.1600848

  • Switching effect in Cu:TCNQ charge transfer-complex thin films by vacuum codeposition 国際誌

    T. Oyamada, H. Tanaka, K. Matsushige, H. Sasabe and C. Adachi

    Appl. Phys. Lett.   2003年8月

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    記述言語:英語  

  • A novel class of photo- and electroactive polymers containing oxadiazole and amine moieties in a side chain 査読

    H Mochizuki, T Hasui, M Kawamoto, T Ikeda, C Adachi, Y Taniguchi, Y Shirota

    MACROMOLECULES   36 ( 10 )   3457 - 3464   2003年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A new class of photo- and electroactive polymer materials showing an liquid-crystalline (LC) phase were designed and synthesized: four kinds of polymers with both oxadiazole and arylamine moieties as carrier-transporting groups in the side chain. Among them, the polymers with a dimethylamine and a methylcarbazole moiety show LC phases. Furthermore, all the polymers emitted strong blue fluorescence, and their fluorescent quantum yields were over 0.6. The aligned sample of the polymer with the carbazole moiety emitted polarized fluorescence at room temperature. One-layer type electroluminescent (EL) devices were fabricated by using the polymer with a triphenylamine moiety, which exhibited the highest quantum yield (similar to0.82), and found to emit the EL emission at blue region.

    DOI: 10.1021/ma021406u

  • Efficient electron injection characteristics of tetra-2-pyridinylpyrazine (TPP) in organic light emitting diodes 査読

    T Oyamada, C Maeda, H Sasabe, C Adachi

    CHEMISTRY LETTERS   32 ( 4 )   388 - 389   2003年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We showed that tetra-2-pyridinylpyrazine (TPP) and TPP: cesium (1:1 molar ratio) composite layers had excellent electron injection and transport characteristics in organic light emitting diodes. High luminescence efficiency with low driving voltage was observed in various cathode configurations, suggesting that the TPP layer can efficiently accept electrons from metal and metal oxide cathode layers, and transport and inject electrons into an adjacent organic layer.

    DOI: 10.1246/cl.2003.388

  • A Novel Class of Photo- and Electroactive Polymers Containing Oxadiazole and Amine Moieties in a Side Chain 国際誌

    H. Mochizuki, T. Hasui, M. Kawamoto, T. Ikeda, C. Adachi, Y. Taniguchi and Y. Shirota

    Macromolecules   2003年4月

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    記述言語:英語  

  • Efficient Electron Injection Characteristics of Tetra-2-pyridinylpyrazine (TPP) in Organic Light Emitting Diodes 国際誌

    T. Oyamada, C. Maeda, H. Sasabe and C. Adachi

    Chem. Lett.   2003年4月

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    記述言語:英語  

  • Amplified spontaneous emission under optical pumping from an organic semiconductor laser structure equipped with transparent carrier injection electrodes 国際誌

    H. Yamamoto, T. Oyamada, H. Sasabe, and C. Adachi

    Appl. Phys. Lett.   2003年2月

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    記述言語:英語  

  • High efficiency single dopant white electrophosphorescent light emitting diodes 査読

    Adamovich, V, J Brooks, A Tamayo, AM Alexander, PI Djurovich, BW D'Andrade, C Adachi, Forrest, SR, ME Thompson

    NEW JOURNAL OF CHEMISTRY   26 ( 9 )   1171 - 1178   2002年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Efficient white electrophosphorescence has been achieved with a single emissive dopant. The dopant in these white organic light emitting diodes (WOLEDs) emits simultaneously from monomer and aggregate states, leading to a broad spectrum and high quality white emission. The dopant molecules are based on a series of platinum(II) [2-(4,6-difluorophenyl)pyridinato-N,C-2'] beta-diketonates. All of the dopant complexes described herein have identical photophysics in dilute solution with structured blue monomer emission (lambda(max) = 468, 500, 540 nm). A broad orange aggregate emission ( l 580 nm) is also observed, when doped into OLED host materials. The intensity of the orange band increases relative to the blue monomer emission, as the doping level is increased. The ratio of monomer to aggregate emission can be controlled by the doping concentration, the degree of steric bulk on the dopant and by the choice of the host material. A doping concentration for which the monomer and excimer bands are approximately equal gives an emission spectrum closest to standard white illumination sources. WOLEDs have been fabricated with doped CBP and mCP luminescent layers (CBP = N,N'-dicarbazolyl-4,4'-biphenyl, mCP = N,N'-dicarbazolyl-3,5-benzene). The best efficiencies and color stabilities were achieved when an electron/exciton blocking layer (EBL) is inserted into the structure, between the hole transporting layer and doped CBP or mCP layer. The material used for an EBL in these devices was fac-tris(1-phenylpyrazolato-N,C-2')iridium(III). The EBL material effectively prevents electrons and excitons from passing through the emissive layer into the hole transporting NPD layer. CBP based devices gave a peak external quantum efficiency of 3.3 +/- 0.3&#37; (7.3 +/- 0.7 lm W-1) at 1 cd m(-2), and 2.3 +/- 0.2&#37; (5.2 +/- 0.3 lm W-1) at 500 cd m(-2). mCP based devices gave a peak external quantum efficiency of 6.4&#37; (12.2 lm W-1, 17.0 cd A(-1)), CIE coordinates of 0.36, 0.44 and a CRI of 67 at 1 cd m(-2) (CIE = Commission Internationale de l'Eclairage, CRI = color rendering index). The efficiency of the mCP based device drops to 4.3 +/- 0.5&#37; (8.1 +/- 0.6 lm W-1, 11.3 cd A(-1)) at 500 cd m(-2), however, the CIE coordinates and CRI remain unchanged.

    DOI: 10.1039/b204301g

  • 1,8-naphthalimides in phosphorescent organic LEDs: The interplay between dopant, exciplex, and host emission 査読

    D Kolosov, Adamovich, V, P Djurovich, ME Thompson, C Adachi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   124 ( 33 )   9945 - 9954   2002年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Four different 1,8-naphthalimide derivatives were examined in phosphorescent organic light emitting diodes (OLEDs), i.e., 1,8-naphthalimide, N-phenyl-1,8-naphthalimide, N-2,6-dibromophenyl-1,8-naphthalimide (niBr), and bis-NN-1,8-naphthalimide. Photoluminescence from all four naphthalimides have violet-blue fluorescence and phosphorescent bands between 550 and 650 nm (visible at 77 K). While all four compounds gave good glassy films when doped with a phosphorescent dopant, only the niBr films remained glassy for extended periods. OLED studies focused on niBr, with two different architectures. One OLED structure (type 1) had the niBr layer as a doped luminescent layer and an undoped niBr layer to act as a hole-blocking layer. The alternate structure (type 2) utilizes a doped CBP layer as the luminescent layer and the niBr layer is used as a hole-blocking layer only (CBP = 4,4'-N,N-dicarbazolylbiphenyl). Type 1 and 2 OLEDs were prepared with green, yellow, and red emissive phosphorescent dopants (lrppy, btlr, and btplr, respectively). The dopants were organometallic lr complexes, previously shown to give highly efficient OLEDs. Of the three dopants, the btplr-based OLEDs showed the best device performance in both structures (peak efficiencies for type 2: 3.2&#37; and 2.3 lum/W at 6.3 V; type 1: 1.7&#37; and 1.3 lm/W at 6.1 V). The green and yellow dopants gave very similar performance in both type 1 and 2 devices (peak efficiencies are 0.2-0.3&#37;), which were significantly poorer than the btplr-based OLEDs. The emission spectrum of the btlr- and btplr-based devices (type 1 and 2) are the same as the solution photoluminescence spectrum of the dopant alone, while the lrppy device gives a broad red emission line (m,, = 640 nm). The red lrppy.niBr emission line is assigned to an lrppy.niBr exciplex. The type 2 lrppy-based device gave a voltage-dependent spectrum, with the red emission observed at low bias (4-8 V), switching over to strong green emission as the bias was raised. All other devices showed bias-independent spectra. Estimates of HOMO, LUMO, and excited-state energies (dopant, niBr, and exciplex) were used to explain the observed spectral properties of these devices. btplr-based devices emit efficiently from isolated dopant states (external efficiencies = 3.2 2.3 lum/W). Irppy-based devices emit only from exciplex states, with low efficiency (external efficiency = 0.3&#37;). btlr.niBr films have very similar energies for the dopant, exciplex, and niBr triplet states, such that relaxation can go through any of these states, leading to low device efficiency (external efficiency = 0.4&#37;). High device efficiency is achieved only when dopant emission is the dominant pathway for relaxation, since exciplex and niBr triplet states give either weak or no electroluminescence.

    DOI: 10.1021/ja0263588

  • High efficiency single dopant white electrophosphorescent light emitting diodes

    V. Adamovich, J. Brooks, A. Tamayo, A. M. Alexander, P. I. Djurovich, B. W. D’Andrade, C. Adachi, S. R. Forrest and M. E. Thompson

    New J. Chem.   2002年8月

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    記述言語:英語  

  • 1,8-Naphthalimides in Phosphorescent Organic LEDs : The Interplay between Dopant, Exciplex, and Host Emission 国際誌

    D. Kolosov, V. Adamovich, P. Djurovich, M. E. Thompson and C. Adachi

    J. Am. Chem. Soc.   2002年7月

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    記述言語:英語  

  • Architectures for efficient electrophosphorescent organic light-emitting devices 査読

    C Adachi, ME Thompson, Forrest, SR

    IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS   8 ( 2 )   372 - 377   2002年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We discuss several device architectures leading to high-efficiency organic electrophosphorescent (EP) light emission. An external electroluminescence efficiency (eta(ext)) of (10.0 +/- 0.5)&#37; was realized by doping fac-tris(2-phenylpyridine)iridium (Ir(ppy)(3)) into a 2,9-dimethyl-4,7-diphenyl-1,10-phenenthroline (BCP) electron transport layer. Direct exciton formation on the phosphor dopant avoids exciplex formation at the interface of unipolar hole and electron transport layers. Further, triplet exciton and carrier dynamics in a double heterostructure were investigated to determine the location and width of the exciton formation zone. High-efficiency EP is also demonstrated in a simplified two layer architecture using a 4,4'-N, N'-dicarbazole-biphenyl (CBP) ambipolar carrier transport host.

    DOI: 10.1109/2944.999192

  • Architectures for Efficient Electrophosphorescent Organic Light-Emitting Devices 国際誌

    C. Adachi, M. E. Thompson and S. R. Forrest

    IEEE, J Selected Topics Quan. Elec.   2002年3月

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    記述言語:英語  

  • Nearly 100&#37; internal phosphorescence efficiency in an organic light-emitting device 査読

    C Adachi, MA Baldo, ME Thompson, Forrest, SR

    JOURNAL OF APPLIED PHYSICS   90 ( 10 )   5048 - 5051   2001年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate very high efficiency electrophosphorescence in organic light-emitting devices employing a phosphorescent molecule doped into a wide energy gap host. Using bis(2-phenylpyridine)iridium(III) acetylacetonate [(ppy)(2)Ir(acac)] doped into 3-phenyl-4(1'-naphthyl)-5-phenyl-1,2,4-triazole, a maximum external quantum efficiency of (19.0 +/-1.0)&#37; and luminous power efficiency of (60 +/-5) lm/W are achieved. The calculated internal quantum efficiency of (87 +/-7)&#37; is supported by the observed absence of thermally activated nonradiative loss in the photoluminescent efficiency of (ppy)(2)Ir(acac). Thus, very high external quantum efficiencies are due to the nearly 100&#37; internal phosphorescence efficiency of (ppy)(2)Ir(acac) coupled with balanced hole and electron injection, and triplet exciton confinement within the light-emitting layer. (C) 2001 American Institute of Physics.

    DOI: 10.1063/1.1409582

  • Nearly 100% internal phosphorescence efficiency in an organic light emitting device 国際誌

    C. Adachi, M. A. Baldo, M. E. Thompson and S. R. Forrest

    J. Appl. Phys.   2001年11月

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    記述言語:英語  

  • Energy relay systems for efficient organic light-emitting devices: Influence of formation of exciplex as revealed by photoexcitation 査読

    R Naitou, M Ichikawa, T Suzuki, C Adachi, T Koyama, Y Taniguchi

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   370   31 - 34   2001年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We investigated potential of performance enhancement for organic light-emitting diodes (OLEDs) by an energy relay system through exciplex Formed between a hole transport material (HTM) and an electron transport material (ETM) as revealed by photoexcitation. An enhancement of a dopant (Coumarin 6) emission occurred depending on combination of HTM and ETM, and the dependency can be explained by an overlap integral between an exciplex emission and an absorption of Coumarin 6 as a dopant. Possibility of performance enhancement by the energy relay system was suggested experimentally.

  • Endothermic energy transfer: A mechanism for generating very efficient high-energy phosphorescent emission in organic materials 査読

    C Adachi, RC Kwong, P Djurovich, Adamovich, V, MA Baldo, ME Thompson, Forrest, SR

    APPLIED PHYSICS LETTERS   79 ( 13 )   2082 - 2084   2001年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Intermolecular energy transfer processes typically involve an exothermic transfer of energy from a donor site to a molecule with a substantially lower-energy excited state (trap). Here, we demonstrate that an endothermic energy transfer from a molecular organic host (donor) to an organometallic phosphor (trap) can lead to highly efficient blue electroluminescence. This demonstration of endothermic transfer employs iridium(III)bis(4,6-di-fluorophenyl)-pyridinato-N,C-2')picolinate as the phosphor. Due to the comparable energy of the phosphor triplet state relative to that of the 4,4'-N,N-'-dicarbazole-biphenyl conductive host molecule into which it is doped, the rapid exothermic transfer of energy from phosphor to host, and subsequent slow endothermic transfer from host back to phosphor, is clearly observed. Using this unique triplet energy transfer process, we force emission from the higher-energy, blue triplet state of the phosphor (peak wavelength of 470 nm), obtaining a very high maximum organic light-emitting device external quantum efficiency of (5.7 +/-0.3)&#37; and a luminous power efficiency of (6.3 +/-0.3)lm/W. (C) 2001 American Institute of Physics.

    DOI: 10.1063/1.1400076

  • Endothermic energy transfer: A mechanism for generating very efficient high-energy phosphorescent emission in organic materials 国際誌

    C. Adachi, Raymond C. Kwong, P. Djurovich, V. Adamovich, M. A. Baldo, M. E. Thompson and S. R. Forrest

    Appl. Phys. Lett.   2001年9月

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    記述言語:英語  

  • High-efficiency yellow double-doped organic light-emitting devices based on phosphor-sensitized fluorescence 査読

    BW D'Andrade, MA Baldo, C Adachi, J Brooks, ME Thompson, Forrest, SR

    APPLIED PHYSICS LETTERS   79 ( 7 )   1045 - 1047   2001年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate high-efficiency yellow organic light-emitting devices (OLEDs) employing [2-methyl-6-[2,3,6,7-tetrahydro-1H,5H-benzo[ij]quinolizin-9-yl)ethenyl]-4H-pyran-4-ylidene] propane-dinitrile (DCM2) as a fluorescent lumophore, with a green electrophospho- rescent sensitizer, fac tris(2-phenylpyridine) iridium [Ir(ppy)(3)] co-doped into a 4,4'-N,N(')dicarbazole-biphenyl host. The devices exhibit peak external fluorescent quantum and power efficiencies of 9&#37;+/-1&#37; (25 cd/A) and 17 +/-2 lm/W at 0.01 mA/cm(2), respectively. At 10 mA/cm(2), the efficiencies are 4.1&#37;+/-0.5&#37; (11 cd/A) and 3.1 +/-0.3 lm/W. We show that this exceptionally high performance for a fluorescent dye is due to the similar to 100&#37; efficient transfer of both singlet and triplet excited states in the doubly doped host to the fluorescent material using Ir(ppy)(3) as a sensitizing agent. These results suggest that 100&#37; internal quantum efficiency fluorescent OLEDs employing this sensitization process are within reach. (C) 2001 American Institute of Physics.

    DOI: 10.1063/1.1388159

  • High-efficiency yellow double-doped organic light-emitting devices based on phosphor-sensitized fluorescence 国際誌

    B. W. D’Andrade, M. A. Baldo, C. Adachi, J. Brooks, M. E. Thompson and S. R. Forrest

    Appl. Phys. Lett.   2001年8月

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    記述言語:英語  

  • Highly Phosphorescent Bis-Cyclometalated Iridium Complexes: Synthesis, Photophysical Characterization, and Use in Organic Light Emitting Diodes 国際誌

    S. Lamansky, P. Djurovich, D. Murphy, F. Abdel-Razzaq, Hae-Eun Lee, C. Adachi, P. E. Burrows, S. R. Forrest and M. E. Thompson

    J. Am. Chem. Soc.   2001年4月

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    記述言語:英語  

  • High-efficiency red electrophosphorescence devices 査読

    C Adachi, MA Baldo, Forrest, SR, S Lamansky, ME Thompson, RC Kwong

    APPLIED PHYSICS LETTERS   78 ( 11 )   1622 - 1624   2001年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate high-efficiency red electrophosphorescent organic light-emitting devices employing bis(2-(2'-benzo[4,5-a]thienyl)pyridinato-N,C-3') iridium(acetylacetonate) [Btp(2)Ir(acac)] as a red phosphor. A maximum external quantum efficiency of eta (ext) = (7.0 +/-0.5)&#37; and power efficiency of eta (p) = (4.6 +/-0.5) lm/W are achieved at a current density of J = 0.01 mA/cm(2). At a higher current density of J = 100 mA/cm(2), eta (ext) = (2.5 +/-0.3)&#37; and eta (p) = (0.56 +/-0.05) lm/W are obtained. The electroluminescent spectrum has a maximum at a wavelength of lambda (max) = 616 nm with additional intensity peaks at lambda (sub) = 670 and 745 nm. The Commission Internationale de L'Eclairage coordinates of (x = 0.68, y = 0.32) are close to meeting video display standards. The short phosphorescence lifetime (similar to4 mus) of Btp(2)Ir(acac) leads to a significant improvement in eta (ext) at high currents as compared to the previously reported red phosphor, 2,3,7,8,12,13,17,18-octaethyl-12H, 23H-prophine platinum (II) PtOEP with a lifetime of similar to 50 mus. (C) 2001 American Institute of Physics.

    DOI: 10.1063/1.1355007

  • Efficient electrophosphorescence using a doped ambipolar conductive molecular organic thin film 査読

    Chihaya Adachi, Raymond Kwong, Stephen R. Forrest

    ORGANIC ELECTRONICS   2 ( 1 )   37 - 43   2001年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate a high efficiency organic electrophosphorescent device comprised of a 4,4',4 ''-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA) hole transport layer and a 4,4'-N,N'-dicarbazole-biphenyl (CBP) host doped with the metallorganic phosphor, fac-tris(2-phenylpyridine)iridium (Ir(ppy)(3)) as the green light-emitting layer. The device exhibits peak external quantum and power efficiencies of (12.0 +/- 0.6)&#37; and (45 +/- 2) lm/W, respectively, corresponding to similar to 60&#37; internal quantum efficiency. A luminance of 1850 cd/m(2) is observed at a current density of 10 mA/cm(2). The device operating properties are controlled by electron injection into, and transport by the CBP layer along with hole injection from m-MTDATA directly into the Ir(ppy)(3) highest occupied molecular level, leading to direct carrier recombination and exciton formation on the phosphor dopant. Ambipolar conduction properties of the Ir(ppy)(3):CBP layer are established by analysis of triplet-triplet annihilation, exciton formation and the luminance current voltage characteristics. (C) 2001 Published by Elsevier Science B.V.

    DOI: 10.1016/S1566-1199(01)00010-6

  • Efficient electrophosphorescence using a doped ambipolar conductive molecular organic thin film 国際誌

    C. Adachi, R. Kwong and S. R. Forrest

    Organic Electronics   2001年2月

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    記述言語:英語  

  • Electroluminescent Behavior of Oxadiazole Derivatives in Liquid-Crystalline Media

    Hirotaka Mochizuki, T. Hasui, Osamu Tsutsumi, Akihiko Kanazawa, Takeshi Shiono, Tomiki Ikeda, Chihaya Adachi, Y. Taniguchi, Y. Shirota

    Mol. Cryst. Liq. Cryst.   365   129-138   2001年1月

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    記述言語:その他  

    Electroluminescent Behavior of Oxadiazole Derivatives in Liquid-Crystalline Media

  • Electroluminescent Behavior of Oxadiazole Derivatives in Liquid-Crystalline Media 国際誌

    H. Mochizuki, T. Hasui, O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, C. Adachi, Y, Taniguchi and Y. Shirota

    Mol. Cryst. and Liq. Cryst.   2001年1月

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    記述言語:英語  

  • Energy Relay Systems for Efficient Organic Light-Emitting Devices: Influence of Formation of Exciplex as Revealed by Photoexcitation 国際誌

    R. Naito, M. Ichikawa, T. Suzuki, C. Adachi, T. Koyama and Y. Taniguchi

    Mol. Cryst. and Liq. Cryst.   2001年1月

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    記述言語:英語  

  • Transient analysis of organic electrophosphorescence. II. Transient analysis of triplet-triplet annihilation 査読

    MA Baldo, C Adachi, Forrest, SR

    PHYSICAL REVIEW B   62 ( 16 )   10967 - 10977   2000年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In the preceding paper, Paper I [Phys. Rev. B 62, 10 958 (2000)], we studied the formation and diffusion of excitons in several phosphorescent guest-host molecular organic systems. In this paper, we demonstrate that the observed decrease in electrophosphorescent intensity in organic light-emitting devices at high current densities [M. A. Baldo et al., Nature 395, 151 (1998)] is principally due to triplet-triplet annihilation. Using parameters extracted from transient phosphorescent decays, we model the quantum efficiency versus current characteristics of electrophosphorescent devices. It is found that the increase in luminance observed for phosphors with short excited-state lifetimes is due primarily to reduced triplet-triplet annihilation. We also derive an expression for a limiting current density (J(0)) above which triplet-triplet annihilation dominates. The expression for J(0) allows us to establish the criteria for identifying useful phosphors and to assist in the optimized design of electrophosphorescent molecules and device structures.

    DOI: 10.1103/PhysRevB.62.10967

  • Transient analysis of organic electrophosphorescence. Ⅱ. Transient analysis of triplet-triplet annihilation 国際誌

    M. A. Baldo, C. Adachi and S. R. Forrest

    Phys. Rev. B   2000年10月

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    記述言語:英語  

  • Novel liquid-crystalline and amorphous materials containing oxadiazole and amine moieties for electroluminescent devices 査読

    H Mochizuki, T Hasui, M Kawamoto, T Shiono, T Ikeda, C Adachi, Y Taniguchi, Y Shirota

    CHEMICAL COMMUNICATIONS   ( 19 )   1923 - 1924   2000年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Three 1,3,4-oxadiazole derivatives with an amine and an alkyl tail were designed and synthesized as novel electroluminescent materials; it was found that the length of alkyl tail and the structure of the amine strongly affect the phase structure of the oxadiazole derivatives.

    DOI: 10.1039/b005550f

  • Emission behavior of molecularly doped electroluminescent device using liquid-crystalline matrix 査読

    H Mochizuki, T Hasui, T Shiono, T Ikeda, C Adachi, Y Taniguchi, Y Shirota

    APPLIED PHYSICS LETTERS   77 ( 11 )   1587 - 1589   2000年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Electroluminescent (EL) behavior has been evaluated in a cell which contained molecular dispersion of 1,4-bis(N,N-diphenylaminophenyl-1,3,4-oxadiazolyl)benzene (OXD) in a low-molecularweight liquid crystal, 4-octyloxy-4'-cyanobiphenyl (8OCB). EL emission was observed above the temperature where the OXD/8OCB mixture showed a liquid-crystalline phase. Furthermore, we fabricated an EL device which consisted of interdigital electrodes coated onto a glass substrate. It was found that the EL emission from the device was highly polarized. (C) 2000 American Institute of Physics. [S0003-6951(00)02937-5].

    DOI: 10.1063/1.1309026

  • Emission behavior of molecularly doped electroluminescent device using liquid-crystalline matrix 国際誌

    H. Mochizuki, T. Hasui, M, T. Shiono, T. Ikeda, C. Adachi, Y. Taniguchi, and Y. Shirota

    Appl. Phys. Lett.   2000年9月

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    記述言語:英語  

  • Novel liquid-crystalline and amorphous materials containing oxadiazole and amine moieties for electroluminescent devices 国際誌

    H. Mochizuki, T. Hasui, M. Kawamoto, M, T. Shiono, T. Ikeda, C. Adachi, Y. Taniguchi, and Y. Shirota

    Chem. Commun.   2000年9月

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    記述言語:英語  

  • High-efficiency organic electrophosphorescent devices with tris(2-phenylpyridine)iridium doped into electron-transporting materials 国際誌

    C. Adachi, M. A. Baldo, S. R. Forrest and M. E. Thompson

    Appl. Phys. Lett   2000年8月

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    記述言語:英語  

  • Low threshold gain-narrowing characteristics of fluorescent styrylbenzene derivatives as a guest molecule in an organic thin-film optical waveguide 査読

    Y Okumura, M Nagawa, C Adachi, M Satsuki, S Suga, T Koyama, Y Taniguchi

    CHEMISTRY LETTERS   ( 7 )   754 - 755   2000年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate that fluorescent styrylbenzene derivatives (SBDs) as a guest molecule (10 mol&#37;) in an organic thin-film optical waveguide show excellent gain-narrowing performance by optical pumping. In particular, an extremely low threshold for gain narrowing is obtained with 4,4'-bis[4-(di-p-tolyl-amino)styryl]biphenyl (LD3). In addition, the incorporation of heterocyclic moieties into the styrylbenzene skeletons results in a higher threshold and also causes no spectral nan owing.

    DOI: 10.1246/cl.2000.754

  • High efficiency organic electrophosphorescent devices 査読

    ME Thompson, S Lamansky, P Djurovich, D Murphy, F Abdel-Razzaq, Forrest, SR, M Baldo, PE Burrows, C Adachi, L Michalski, K Rajan, JJ Brown

    ORGANIC LIGHT-EMITTING MATERIALS AND DEVICES IV   4105   119 - 124   2000年6月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We have fabricated saturated red, orange, yellow and green OLEDs, utilizing phosphorescent dopants. Using phosphorescence based emitters we have eliminated the inherent 25&#37; upper limit on emission observed for traditional fluorescence based systems. The quantum efficiencies of these devices are quite good, with measured external efficiencies > 15&#37; and > 40 lum/W (green) in the best devices. The phosphorescent dopants in these devices are heavy metal containing molecules (i.e. Pt, and Ir), prepared as both metalloporphyrins and organometallic complexes. The high level of spin orbit coupling in these metal complexes gives efficient emission from triplet states. In addition to emission from the heavy metal dopant, it is possible to transfer the exciton energy to a fluorescent dye, by Forster energy transfer. The heavy metal dopant in this case acts as a sensitizer, utilizing both singlet and triplet excitons to efficiently pump a fluorescent dye. We discuss the important parameters in designing electrophosphorescent OLEDs as well as their strengths and limitations. Accelerated aging studies, on packaged devices, have shown that phosphorescence based OLEDs can have very long device lifetimes.

  • Electroluminescence mechanisms in organic light emitting devices employing a europium chelate doped in a wide energy gap bipolar conducting host 国際誌

    C. Adachi, M. A. Baldo and S. R. Forrest

    J. Appl. Phys.   2000年6月

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    記述言語:英語  

  • High-efficiency transparent organic light-emitting devices 査読

    G Parthasarathy, C Adachi, PE Burrows, Forrest, SR

    APPLIED PHYSICS LETTERS   76 ( 15 )   2128 - 2130   2000年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrate organic light-emitting devices (OLEDs) employing highly transparent cathodes comprised of 2,9-dimethyl-4,7 diphenyl-1,10-phenanthroline (BCP) and an ultrathin film of Li capped with radio-frequency magnetron-sputtered indium-tin-oxide. The cathodes are incorporated onto a conventional bilayer small-molecule OLED. The operating voltages and the total device external quantum efficiencies emitted from the top and substrate surfaces (1.0 +/- 0.05)&#37; are comparable to the best conventional undoped OLEDs employing thick metallic cathodes. The device characteristics are independent of the position of Li within the compound cathode, suggesting that Li readily diffuses through BCP to enhance electron injection. An increase of a factor similar to 3.5 in the external quantum efficiency is observed compared to devices containing no Li. These results suggest that Li donates electrons to the BCP, increasing its conductivity to the point that band bending occurs to aid in the injection of charge. (C) 2000 American Institute of Physics. [S0003-6951(00)05015-4].

  • High-efficiency transparent organic light-emitting devices 国際誌

    G. Parthasarathy, C. Adachi, P. E. Burrows and S. R. Forrest

    Appl. Phys. Lett.   2000年4月

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    記述言語:英語  

  • Low Threshold Gain-Narrowing Characteristics of Fluorescent Styrylbenzene Derivatives as a Guest Molecule in an Organic Thin-Film Optical Waveguide 国際誌

    Y. Okumura, M. Nagawa, C. Adachi, M. Satsuki, S. Suga, T. Koyama and Y. Taniguchi

    Chem. Lett.   2000年3月

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    記述言語:英語  

  • Electroluminescence of organic light emitting diodes with a thick hole transport layer composed of a triphenylamine based polymer doped with an antimonium compound 査読

    A Yamamori, C Adachi, T Koyama, Y Taniguchi

    JOURNAL OF APPLIED PHYSICS   86 ( 8 )   4369 - 4376   1999年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We investigated the electroluminescence (EL) performance of organic light emitting diodes having a thick doped hole transport layer [(DHTL):650 nm-1.5 mu m]. The basic cell structure is an anode/DHTL/hole transport layer [(HTL):50-60 nm]/emitter layer [(EML):50-60 nm]/cathode. We examined various combinations of host polymers and guest molecules as a component of DHTL in this device structure. During the course of the materials' search, we found that the best combination of a hole transport polycarbonate polymer (PC-TPD-DEG) and a tris (4-bromophenyl) aminium hexachroloantimonate (TBAHA) as a dopant enabled us to form a uniform thick DHTL (typically 650 nm-1.5 mu m thick), which resulted in excellent EL performance. The thick DHTL not only showed considerable reduction in cell resistance compared with a conventional anode/DHTL (without doping)/HTL/EML/cathode device with the same thicknesses of the organic layers, but also greatly contributed to the enhancement of the device stability, particularly to pinhole problems that can occur with conventional 100-nm-thick thin devices. Furthermore, the interposed HTL between DHTL and EML was confirmed to function not only as a HTL but also as electron and exciton blocking layers. Without the HTL, the EL quantum efficiency (Phi(EL)) was low, because of the serious exciton energy transfer and/or electron migration from EML to DHTL where the PC-TPD-DEG:TBAHA complex layer had absorption at around 485 nm based on a charge transfer complex between them. We could increase it by interposing a thin transparent N,N'-diphenyl-N,N'-bis(3-methyl phenyl)-1,1'-biphenyl-4,4'-diamine or 4,4'-bis[N-(1-naphthyl)-N-phenyl-amino] biphenyl (alpha-NPD) layer between DHTL and EML, while keeping the driving voltage low. With the DHTL (650 nm, 10 wt &#37; of TBAHA) showed a luminance of 4004 cd/m(2) at 10.0 V and 220 mA/cm(2), of which the performance was comparable with that of typical thin film devices. Furthermore, we could expand the DHTL thickness up to 1.5 mu m. An indium tin oxide (ITO)/DHTL (10 wt &#37;)(1.5 mu m)/alpha-NPD (60 nm)/Alq (60 nm)/MgAg device showed a luminance of 2600 cd/m(2) at 18.0 V and 210 mA/cm(2) with enhanced duration stability. In addition, the duration properties of the devices were also examined in the device structure of an ITO/DHTL (650 nm)/alpha-NPD (60 nm)/Alq(doped with rubrene 4.2 wt &#37;) (60 nm)/MgAg. The half decay of the initial luminance successively exceeded over 1000 h under a constant current density of 10 mA/cm(2). (C) 1999 American Institute of Physics. [S0021-8979(99)06020-X].

    DOI: 10.1063/1.371372

  • Electroluminescence of organic light emitting diodes with a thick hole transport layer composed of a triphenylamine based polymer doped with an antimonium compound 国際誌

    A. Yamamori, C. Adachi, T. Koyama and Y. Taniguchi

    J. Appl. Phys.   1999年10月

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    記述言語:英語  

  • Significant improvement of device durability in organic light-emitting diodes by doping both hole transport and emitter layers with rubrene molecules 査読

    G Sakamoto, C Adachi, T Koyama, Y Taniguchi, CD Merritt, H Murata, ZH Kafafi

    APPLIED PHYSICS LETTERS   75 ( 6 )   766 - 768   1999年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We have developed highly durable organic light-emitting diodes. The basic structure of the diodes is anode/hole injection layer/hole transport layer+dopant/emitter layer+dopant/cathode. Both the hole transport and the emitter layers were doped with the highly fluorescent rubrene molecules. With the doping of both layers, 85&#37; of the initial luminance was successively maintained even after 1000 h of continuous operation under constant current driving. Doping of only one of these layers, either the hole transport layer or emitter layer, on the other hand, resulted in shorter lifetime. We mention the possible mechanisms of the doping that enhance the device duration. (C) 1999 American Institute of Physics. [S0003-6951(99)03132-0].

    DOI: 10.1063/1.124506

  • Significant improvement of device durability in organic light-emitting diodes by doping both hole transport and emitter layers with rubrene molecules 国際誌

    G. Sakamoto, C. Adachi, T. Koyama, Y. Taniguchi, C. D. Merritt, H. Murata and Z. H. Kafafi

    Appl. Phys. Lett.   1999年8月

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    記述言語:英語  

  • Charge carrier trapping effect by luminescent dopant molecules in single-layer organic light emitting diodes 国際誌

    M. Uchida, C. Adachi, T. Koyama and Y. Taniguchi

    J. Appl. Phys.   1999年8月

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    記述言語:英語  

  • A 200nm x 2mm array of organic light-emitting diodes and their anisotropic electroluminescence 査読

    N Suganuma, C Adachi, T Koyama, Y Taniguchi, H Shiraishi

    APPLIED PHYSICS LETTERS   74 ( 9 )   1206 - 1208   1999年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We demonstrated the fabrication of a 200 nmX2 mm array of organic light-emitting diodes (OLEDs) on a glass substrate. The photolithographic technique using an optical phase shift mask allowed us to construct a super-fine resolution patterning of OLEDs. A single organic electroluminescent (EL) layer composed of an inert poly(methylmethacrylate) polymer binder and tetraphenylbendidine and tris(8-quinolinol) aluminum molecules was fabricated on a fine-resolution photoresist patterning by a spin coating method. The lines and spaces of the photoresist patterning were 200 nm. The emitting area was well confined by the regular array of residual photoresist resin walls. Finally, a MgAg cathode layer was uniformly deposited on the organic layer. We observed anisotropic EL spectra between the directions perpendicular and parallel to the patterning of OLED arrays. Furthermore, we observed a large difference of EL intensities between them. We assume that the anisotropic EL characteristics are caused by the confinement effect of photons inside the submicrometer-sized OLED array. (C) 1999 American Institute of Physics. [S0003-6951(99)02709-6].

    DOI: 10.1063/1.123500

  • A 200nm x 2mm array of organic light-emitting diodes and their anisotropic electroluminescence 国際誌

    N. Suganuma, C.Adachi, T. Koyama, Y. Taniguchi and H. Shiraishi

    Appl. Phys. Lett.   1999年3月

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    記述言語:英語  

  • Organic light emitting diodes using triphenylene derivatives as a hole transport material 査読

    S Tanaka, C Adachi, T Koyama, Y Taniguchi

    CHEMISTRY LETTERS   ( 10 )   975 - 976   1998年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We elucidated that hexaalkoxytriphenylenes (HATs) are useful as a hole transport layer (HTL) in organic light emitting diodes (OLEDs). In particular, the insertion of a thin phthalocyanine layer between the anode and HTL drastically improved electroluminescent (EL) performance. Furthermore, we observed that the alkyl chain length of HATs greatly affected carrier transport and EL properties.

    DOI: 10.1246/cl.1998.975

  • Specific Conductivity Dependence on Diameter of Submicro-Sized Polythiophene Fibrils 査読

    Toshiki Koyama, Makoto Murata, Shoji Yamaguchi, Chihaya Adachi, Yoshio Taniguchi

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS   322   85 - 90   1998年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Deposition mechanism and a diameter dependence of the conductivity of polythiophene derivative fibrils polymerized in pores of a membrane filter having submicrometer-sized pores aperture were discussed. Deposition process of the fibrils was able to be divided in the following three stages from SEM observation and polymerization current measurements. The first stage is the generation of deposition growth nucleus on the pore-inside wall and the filter surface, the second is growth of thickness of a thin-layer-deposit, and the third is the accumulation of a spherical deposit And, when the pore size became big, the second stage shortened remarkably, and thickness of the thin-layer-deposit became thinner, and the spherical deposition began earlier. From the simulated conductivity of the fibrils with each diameter, at the smaller pore aperture than a specific value, the thickness of the thin-layer-deposit having high-conductivity increases. When the pore aperture becomes smaller, the thin-layer-deposition is remarkably easy to occur.

    DOI: 10.1080/10587259808030204

  • Organic light-emitting diodes using spherical aggregates 査読

    C Adachi, S Hibino, A Yamamori, M Uchida, T Koyama, Y Taniguchi

    ORGANIC LIGHT-EMITTING MATERIALS AND DEVICES   3148   62 - 69   1997年7月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

    We have succeeded in fabricating submicrometer-sized organic light emitting diodes (OLED) with bright emission using a polymer blend. The cell structure was composed of ITO (indium-tin oxide)/hole transport layer (polymer blend layer)/emitter layer/MgAg. We used poly (methyl methacrylate) (PMMA) as an inert host material and N,N'-diphenyl-N,N'-bis(3-methylphenyl)-[1,1'-biphenyl]-4,4'-diamine-polycarbonate (PC-TPD) as a guest material. The polymer blend layers showed various morphology depending on the concentration of PC-TPD. With 2wt&#37; of PC-TPD, the PC-TPD formed submicrometer-sized spherical domains, actually prolate spheroids, in the PMMA. host layer. The domain diameters were around 200 nm according to AFM and SEM observations. The OLED including such a blend structure showed aggregation of bright submicrometer-sized electroluminescence spots. The number of working diodes exceeded four million per square centimeter.

  • Submicrometer-sized organic light emitting diodes with a triphenylamine-containing polycarbonate as a guest molecule in a polymer blend 査読

    C Adachi, S Hibino, T Koyama, Y Taniguchi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS   36 ( 6B )   L827 - L830   1997年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We fabricated submicrometer-sized organic light emitting diodes (OLED) with bright emission using a polymer blend. The cell structure was composed of ITO (indium-tin oxide)/hole transport layer (polymer blend layer)/emitter layer/MgAg. We used poly (methyl methacrylate) (PMMA) as an inert host material and N,N'-diphenyl-N,N'-bis(3-methylphenyl)-[1,1'-biphenyl]-4,4'-diamine-polycarbonate (PC-TPD) as a guest material. The PC-TPD formed submicrometer-sized spherical domains, actually prolate spheroids, in the PMMA host layer. With 2 wt&#37; of PC-TPD, the domain diameters were around 200 nm according to atomic force microscopy (AFM) observation. The OLED including such a blend structure appeared as an array of bright submicrometer-sized electroluminescence spots. The number of working diodes exceeded four million per square centimeter.

    DOI: 10.1143/jjap.36.L827, 10.1143/JJAP.36.L827

  • Electroluminescence of 1,3,4-oxadiazole and triphenylamine-containing molecules as an emitter in organic multilayer light emitting diodes 査読

    N Tamoto, C Adachi, K Nagai

    CHEMISTRY OF MATERIALS   9 ( 5 )   1077 - 1085   1997年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We synthesized five new emitter molecules having an oxadiazole group as an electron transport unit and a triphenylamine group as a hale transport unit. We investigated the electroluminescent (EL) properties of these molecules as an emitter layer. The deposited films of all compounds were found to be amorphous and showed strong blue-green fluorescence, ranging from 450 to 490 nm. With the best device using these emitters, the maximum luminance exceeded 19 000 cd/m(2). We observed that external EL quantum efficiencies (phi(EL)) were drastically influenced by combinations of hole-transport materials. Formation of exciplexes between the emitters and hole-transport materials was found to greatly influence phi(EL) We observed that the hole-transport layers (HTLs) having a low ionization potential (Ip) value tended to form exciplexes with the emitter layers, resulting in a low phi(EL) On the other hand, the HTLs having a large Ip formed no exciplexes with emitter layers and showed a high phi(EL) In the best device, a phi(EL)similar to 4&#37; was obtained. Furthermore, we also studied the optimum EL cell structures using the bipolar emitters. We observed that a double hetero (DH) structure was the best device structure and could achieve an external energy conversion efficiency (phi(energy)) of 3.75 lm/W at a current density of 10 mA/cm(2). This is an excellent value among the organic EL devices previously reported. In addition, the durabilities of the EL devices were also measured at constant current density. Performances of the EL device durabilities were quite inferior with these emitter materials. The time for the luminance to decay to half of the initial luminance was below 1 h.

    DOI: 10.1021/cm960391+

  • Durability characteristics of aminopyrene dimer molecules as an emitter in organic multilayered electroluminescent diodes 査読

    C Adachi, K Nagai, N Tamoto

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   35 ( 9A )   4819 - 4825   1996年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We report the structure design of emitter molecules using aminopyrene dimers for obtaining durable organic electroluminescent (EL) diodes. Using eighteen kinds of emitter molecules having a variety of substituents and linking groups, we investigated the durability of the cell structure of the anode/hole transport layer/emitter layer/electron transport layer 2/electron transport layer 1/cathode. We observed that the chemical structures of the emitter molecules strongly influenced the durability of the EL devices under continuous DC operation. Mie observed no direct relationships between melting point (T-m); glass transition temperature (T-g), ionization potential (I-p), electron affinity (E(a)) of emitter layers and EL device durabilities. The effect of the substituent groups of emitter molecules on EL device durability suggests that the chemical stability of the emitter molecules largely influences EL device durability.

    DOI: 10.1143/JJAP.35.4819

  • MOLECULAR DESIGN OF HOLE TRANSPORT MATERIALS FOR OBTAINING HIGH DURABILITY IN ORGANIC ELECTROLUMINESCENT DIODES 査読

    C ADACHI, K NAGAI, N TAMOTO

    APPLIED PHYSICS LETTERS   66 ( 20 )   2679 - 2681   1995年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/1.113123

  • SIGNIFICANCE OF MULTILAYER STRUCTURES IN ORGANIC THIN-FILM ELECTROLUMINESCENT DEVICES 査読

    T TSUTSUI, EI AMINAKA, Y HAMADA, C ADACHI, S SAITO

    ELECTROLUMINESCENT MATERIALS, DEVICES, AND LARGE-SCREEN DISPLAYS   1910   180 - 189   1993年8月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

  • PROGRESS IN ORGANIC MULTILAYER ELECTROLUMINESCENT DEVICES 査読

    S SAITO, T TSUTSUI, M ERA, N TAKADA, C ADACHI, Y HAMADA, T WAKIMOTO

    ELECTROLUMINESCENT MATERIALS, DEVICES, AND LARGE-SCREEN DISPLAYS   1910   212 - 221   1993年8月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

  • RELATION BETWEEN MOLECULAR-STRUCTURES OF DYES AND PHOTOVOLTAIC PROPERTIES IN 2 LAYER ORGANIC SOLAR-CELLS USING PHTHALOCYANINES AND PERYLENETETRACARBOXYLIC ACID-DERIVATIVES 査読

    Y FUJITA, C ADACHI, T TSUTSUI, S SAITO

    NIPPON KAGAKU KAISHI   ( 10 )   1154 - 1161   1992年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    Photovoltaic Properties of two-layer organic solar cells were investigated. Metal phthalocyanines (MPc) and porphyrins (Por) shown in Fig.1 were employed for p-type layer. 3, 4 : 9. 10-Bis(imidazo[1, 2-a]pyrido-fused)perylene derivatives (PTCIz) shown in Fig. 2 were employed for n-type layer. The cell structure was indium-tin oxide(ITO)/n-type layer/p-type layer/Au and the cells were irradiated with white light through the ITO electrode. The thicknesses of organic layers were 500 angstrom. Positive voltage appeared on an Au electrode under illumination in all the cells. Short-circuit current was proportional to the incident light intensity (Fig. 9), and open-circuit voltage was proportional to the log (incident light intensity) (Fig. 10). The photocurrent spectra reflected the absorption spectra of MPc or Por layers, indicating the occurrence of effective carrier generation in MPc or Por layers. The short-circuit current of the cells ranged between 0. 89 and 0. 004 mA/cm2 at the incident light power of 15 mW/cm2 (Tables 1, 2 and 3). The open-circuit voltage ranged between 0. 74 and 0. 15 V. The fill factor ranged between 0. 63 and 0. 21. Short-circuit current was most profoundly influenced, when chemical structures of dyes were varied. The energy conversion efficiencies of the cells using MPc and PTCIz ranged between 1. 9 and 0. 002&#37;.

  • BLUE-LIGHT-EMITTING ORGANIC ELECTROLUMINESCENT DEVICES WITH OXADIAZOLE DIMER DYES AS AN EMITTER 査読

    Y HAMADA, C ADACHI, T TSUTSUI, S SAITO

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   31 ( 6A )   1812 - 1816   1992年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Multilayer thin-film electroluminescent devices with blue emission color have been fabricated using new oxadiazole dimer dyes for both emission and electron transport layers. Emission characteristics of three types of cells, SH-A: ITO/HTL/EML/MgAg, SH-B: ITO/EML/ETL/MgAg and DH: ITO/HTL/EML/ETL/MgAg, in which ITO, HTL, EML, ETL and MgAg represent indium-tin-oxide cathode, hole transport layer, emission layer, electron transport layer and magnesium-silver alloy anode, respectively, are compared. Luminances exceeding 1000 cd/m2 are observed and emission peaks are located at 470-480 nm. Among the three cells, the DH cell shows the best performance. The DH cell is stable for more than 40-day storage and can also be continuously driven for more than one hour at room temperature and 7 h at liquid nitrogen temperature.

    DOI: 10.1143/JJAP.31.1812

  • ORGANIC ELECTROLUMINESCENT DEVICE WITH CYANINE DYE LANGMUIR-BLODGETT-FILM AS AN EMITTER 査読

    M ERA, C ADACHI, T TSUTSUI, S SAITO

    THIN SOLID FILMS   210 ( 1-2 )   468 - 470   1992年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Double hetero-structure electroluminescent (EL) devices with a cyanine dye LB film as an emitter were prepared. The cyanine dye formed J-aggregate in the LB film, and intense fluorescence with very narrow bandwidth was observed in the LB film. When DC voltage was applied to the devices, EL corresponded well with the resonance fluorescence of the J-aggregated cyanine dye. As a result of confinement of charge carriers and excitons within the cyanine dye emitter, efficient electroluminescence was attained even in the device with the J-aggregated cyanine dye bimolecular layer as an emitter.

    DOI: 10.1016/0040-6090(92)90314-2

  • OXADIAZOLE DERIVATIVES FOR EMITTER AND CARRIER TRANSPORT MATERIALS IN ORGANIC ELECTROLUMINESCENT DEVICES 査読

    Y HAMADA, C ADACHI, T TSUTSUI, S SAITO

    NIPPON KAGAKU KAISHI   ( 11 )   1540 - 1548   1991年11月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    Ten oxadiazole derivatives which were newly synthesized were examined as an emitter in organic electroluminescence (EL) cells. The new oxadiazole derivatives exhibited the photoluminescence (PL) peaks at the wavelength region between 374 and 527 nm. Vacuum-deposited thin films of these compounds had excellent thermal stability, because they have high melting temperature ranging from 240 to 365-degrees-C.
    The organic EL cells with 4,4'-bis[5-(p-dimethylaminophenyl)-1,3,4-oxadiazol-2-yl]biphenyl, 1,3-bis[5-(p-dimethylaminophenyl)-1,3,4-oxadiazol-2-yl]benzene and 1,4-bis[5-(p-dimethylaminophenyl)-1,3,4-oxadiazol-2-yl]benzene as an emitter showed bright emission whose intensities were 1000 approximately 2000 cd/m2. The emission colors were green, blue, and green, respectively.
    These three oxadiazole derivatives were found to exhibit specific electronic characteristics that they transport both holes and electrons.
    Utilization of these materials for both emitter and electron transport materials were demonstrated.

    DOI: 10.1246/nikkashi.1991.1540

  • EFFECT OF CONFINED RADIATION-FIELD ON SPONTANEOUS-EMISSION LIFETIME IN VACUUM-DEPOSITED FLUORESCENT DYE FILMS 査読

    T TSUTSUI, C ADACHI, S SAITO, M WATANABE, M KOISHI

    CHEMICAL PHYSICS LETTERS   182 ( 2 )   143 - 146   1991年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Spontaneous emission lifetimes of fluorescent dye layers in front of a metallic mirror were observed using a picosecond time-resolved fluorescence measurement system. Multilayer thin-film samples composed of glass substrate/indium-tinoxide layer/organic spacer layer/emission dye layer/organic spacer layer/MgAg mirror were prepared with vacuum-vapor deposition. The distance between an MgAg mirror and an emission dye layer was varied from 25 to 180 nm. The emission lifetime of the fluorescent dye layer largely depended on the MgAg mirror-emission layer distance and assumed a maximum at around 150 nm. A promising application of organic multilayer structures for the study on optical microcavity was suggested.

    DOI: 10.1016/0009-2614(91)80118-H

  • ELECTROLUMINESCENCE IN ORGANIC THIN-FILMS 査読

    T TSUTSUI, C ADACHI, S SAITO

    PHOTOCHEMICAL PROCESSES IN ORGANIZED MOLECULAR SYSTEMS   437 - 450   1991年6月

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    記述言語:英語   掲載種別:研究論文(その他学術会議資料等)  

  • ELECTROLUMINESCENCE IN MULTILAYER ORGANIC-DYE FILMS 査読

    T TSUTSUI, C ADACHI, S SAITO

    SYNTHETIC METALS   41 ( 3 )   1193 - 1196   1991年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    High efficiency electroluminescent devices using organic multilayer dye films were fabricated. Mechanism of electroluminescence in the multilayer dye films is described. The importance of the confinements of both charge carriers and molecular excitons within narrow emission regions was emphasized.

    DOI: 10.1016/0379-6779(91)91588-2

  • DOUBLE-HETEROSTRUCTURE ELECTROLUMINESCENT DEVICE WITH CYANINE-DYE BIMOLECULAR LAYER AS AN EMITTER 査読

    M ERA, C ADACHI, T TSUTSUI, S SAITO

    CHEMICAL PHYSICS LETTERS   178 ( 5-6 )   488 - 490   1991年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Using the Langmuir-Blodgett technique, we fabricated a double-heterostructure electroluminescent (EL) device with a J-aggregated cyanine-dye bimolecular layer as an emitting layer. The EL cells were composed of an indium tin oxide electrode, a diamine hole-transport layer, a J-aggregated cyanine-dye emitting layer, an oxadiazole electron-transport layer and an MgAg electrode. Efficient EL was observed in the EL device owing to the confinement of charge carriers and excitons within the cyanine-dye bimolecular layer. The EL spectrum corresponded well to resonance fluorescence of the J-aggregate.

    DOI: 10.1016/0009-2614(91)87007-X

  • MULTILAYER-TYPE ORGANIC SOLAR-CELLS USING PHTHALOCYANINES AND PERYLENE DERIVATIVES 査読

    T MORIKAWA, C ADACHI, T TSUTSUI, S SAITO

    NIPPON KAGAKU KAISHI   ( 9 )   962 - 967   1990年9月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/nikkashi.1990.962

  • ELECTROLUMINESCENT MECHANISM OF ORGANIC THIN-FILM DEVICES 査読

    C ADACHI, T TSUTSUI, S SAITO

    ACTA POLYTECHNICA SCANDINAVICA-APPLIED PHYSICS SERIES   ( 170 )   215 - 218   1990年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • BLUE ELECTROLUMINESCENCE IN ORGANIC MULTILAYER THIN-FILM DEVICES 査読

    T TSUTSUI, C ADACHI, S SAITO

    ACTA POLYTECHNICA SCANDINAVICA-APPLIED PHYSICS SERIES   170 ( 170 )   145 - 148   1990年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • ORGANIC ELECTROLUMINESCENT DEVICE WITH A 3-LAYER STRUCTURE 査読

    C ADACHI, S TOKITO, T TSUTSUI, S SAITO

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS   27 ( 4 )   L713 - L715   1988年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1143/JJAP.27.L713

  • ELECTROLUMINESCENCE IN ORGANIC FILMS WITH 3-LAYER STRUCTURE 査読

    C ADACHI, S TOKITO, T TSUTSUI, S SAITO

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS   27 ( 2 )   L269 - L271   1988年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1143/JJAP.27.L269

  • Improved Device Lifetime of Organic Light Emitting Diodes with an Electrochemically Stable-Conjugated Liquid Host in the Liquid Emitting Layer 査読 国際誌

    Shuzo Hirata, Hyo Jung Heo, Yuki Shibano, Oamu Hirata, Masayuki Yahiro, and Chihaya Adachi

    Jpn. J. Appl.Phys.   1900年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Organic luminescent molecule with energetically equivalent singlet and triplet excited states for organic light-emitting diodes 査読 国際誌

    Keigo Sato, Katsuyuki Shizu, Kazuaki Yoshimura, Atsushi Wada, Hiroshi Miyazaki, CHIHAYA ADACHI

    Phys. Rev. Lett   1900年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Reversible thermal recording media using time-dependent persistent room temperature phosphorescence 査読 国際誌

    Shuzo Hirata, Kentaro Totani, Hironori Kaji, Martin Vacha, Toshiyuki Watanabe, CHIHAYA ADACHI

    Adv. Opt. Mater.   1900年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Amplified spontaneous emission and electroluminescence from thiophene/phenylene co-oligomer-doped p-bis(p-styrylstyryl)benzene crystals 査読 国際誌

    Hajime Nakanotani, CHIHAYA ADACHI

    Adv. Opt. Mater.   1900年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

▼全件表示

書籍等出版物

  • 有機半導体の開発と最新動向

    安達千波矢(担当:監修)

    シーエムシー出版  2024年3月    ISBN:9784781317632

     詳細を見る

    記述言語:その他  

  • 有機半導体の開発と最新動向 = Development and recent trends in organic semiconductors

    安達 千波矢

    シーエムシー出版  2024年    ISBN:9784781317632

     詳細を見る

    記述言語:日本語  

    CiNii Books

  • Solution-processable organic lasers and their future prospects

    Chathuranganie A. M. Senevirathne, Atula S. D. Sandanayaka, Chihaya Adachi(担当:共著)

    2023年9月    ISBN:9780323951463

     詳細を見る

    記述言語:その他  

  • Organic Semiconductors for Optoelectronics Chapter 12 Advanced Molecular Design for Organic Light Emitting Diode Emitters Based on Horizontal Molecular Orientation and Thermally Activated Delayed Fluorescence

    Li Zhao,DaeHyeon Kim,Jean-Charles Ribierre,Takeshi Komino,Chihaya Adachi(担当:共著)

    Wiley & Sons Ltd  2021年7月 

     詳細を見る

    記述言語:英語   著書種別:学術書

  • 2020版 薄膜作製応用ハンドブックー有機発光素子(有機薄膜導波路固体レーザ)7章 有機・バイオデバイス

    安達 千波矢(担当:共著)

    2020年2月 

     詳細を見る

    記述言語:日本語  

  • Handbook of Organic Light-Emitting Diodes

    Chihaya Adachi, Reiji Hattori, Hironori Kaji, Takatoshi Tsujimura(担当:共著)

    Springer社  2020年1月 

     詳細を見る

    記述言語:日本語  

  • ペロブスカイト太陽電池の開発最前線ーメタルハライドペロブスカイトを半導体層とした電界効果トランジスタ 第15章

    松島 敏則, 安達 千波矢(担当:共著)

    シーエムシー出版  2019年7月 

     詳細を見る

    記述言語:日本語  

  • Functional Organic Liquids-Organic Light Emitting Diodes with Liquid Emitters -

    Takashi Nakanishi; Jean-Charles Ribierre; Jun Mizuno; Reiji Hattori; Chihaya Adachi(担当:共著)

    Wiley VCH Verlag GmbH  2019年3月 

     詳細を見る

    記述言語:英語   著書種別:学術書

  • 最先端の有機EL -基礎物理・材料化学・デバイス応用と解析技術-

    安達 千波矢(担当:共著)

    シーエムシー出版  2017年4月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • 革新的な第三世代有機EL発光材料 ー基礎研究から九大発ベンチャーの設立へー

    安達 千波矢(担当:共著)

    学士会  2016年9月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • 先端 有機半導体デバイス:-基礎からデバイス物性まで-

    安達 千波矢(担当:編集)

    オーム社  2015年8月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • 環境問題解決のための先進的技法

    安達 千波矢(担当:共著)

    花書院  2015年3月    ISBN:4865610170

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • Physics of Organic Semiconductors

    CHIHAYA ADACHI, Wolfgang Brütting(担当:共著)

    Wiley-VCH  2013年4月 

     詳細を見る

    記述言語:英語   著書種別:学術書

  • 解説 レーザーディスプレイ ~基礎から応用まで~

    (社)応用物理学会 日本光学会 レーザーディスプレイ技術研究グループ 企画 黒田 和男, 山本 和久, 栗原 直, 安達 千波矢

    オプトロニクス社  2010年2月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 機能と応用[4.7 有機半導体デバイス] ソフトマタ― ~分子設計・キャラクタリゼーションから機能性材料まで~

    高原 淳, 栗原 和枝, 前田 端夫, 浅川 鋼児, 安達 千波矢 他

    丸善株式会社  2009年4月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 発光材料の基礎と新しい展開~固体照明・ディスプレイ材料~

    金光 義彦, 岡本 伸治, 安達 千波矢, 河村 祐一郎, 長谷川 靖哉, 大森 裕, 玉置 寛人, 村崎 嘉典, 大塚 礼治, 久宗 孝之, 藤原 忍(担当:共著)

    オーム社  2008年9月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • 有機ELのデバイス物理・材料化学・デバイス応用

    安達千波矢(監修)

    ㈱シーエムシー出版  2007年12月 

     詳細を見る

    記述言語:その他   著書種別:一般書・啓蒙書

  • 有機エレクトロニクスにおける分子配向技術 Advanced Technology of Molecular Alignment for Organic Electronics

    内生蔵広幸, 八尋正幸, 安達千波矢(担当:共著)

    ㈱シーエムシー出版  2007年4月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • 柔構造有機エレクトロニクス 電気学会(編纂)

    安達千波矢(担当:共著)

    オーム社  2007年3月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • 柔構造有機エレクトロニクス 電気学会 5章 5.2 発光デバイス

    安達 千波矢

    電気学会、 オーム社  2007年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 応用の可能性膨らむ有機光半導体

    安達千波矢

    日経ナノビジネス  2006年4月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • 進化する有機半導体-有機エレクトロニクス創成に向けた光・電子機能デバイスへの応用最前線-

    安達千波矢, 中野谷一(担当:共著)

    エヌ・ティー・エス  2006年3月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • NIKKEI FPD 2006 <基礎技術編> ~ パネル別に最新技術を解説 ~ “FPD International 2005”から

    小山田崇人, 安達千波矢(担当:共著)

    日経BP  2006年3月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • 有機基盤状の電子デバイス 第6.5章

    内生蔵 広幸, 八尋 正幸, 安達 千波矢

    シーエムシー出版  2006年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機薄膜太陽電池の最新技術 第5章―ビススチリルベンゼン誘導体を活性層とする有機DFBレーザーの発振特性

    中野谷 一, 安達 千波矢(担当:共著)

    シーエムシー出版  2005年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • Date book on HOMO levels of organic thin films I organic semiconductor devices

    Chihaya Adachi and Takahito Oyamada

    CMC CO. Ltd.  2005年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 図解:高分子新素材のすべて 1. 光・電子機能高分子素材―有機ELデバイス

    工業技術調査会, 安達 千波矢

    工業技術調査会  2005年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機ディスプレイの歴史と技術動向

    安達 千波矢

    イーエクスプレス  2004年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機ELディスプレー

    時任 静士, 安達 千波矢, 村田 英幸

    オーム社  2004年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機EL材料技術 第2章(1) りん光EL素子の原理と発光機構

    河村 祐一郎, 合志 憲一, 安達 千波矢

    シーエムシー出版  2004年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機デバイス研究者のための有機薄膜仕事関数データ集

    安達 千波矢, 小山田 崇人, 中島 嘉之

    シーエムシー出版  2004年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機トランジスタの動作性向上技術 第5章 有機デバイスの開発状況とその将来性 第1節 有機リン光発光素子

    安達 千波矢

    技術情報協会  2003年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機エレクトロニクス・フォトニクス材料デバイス―21世紀情報産業の新たな展開を目指して―第3章"有機半導体レーザー"

    長村 利彦, 安達 千波矢, 山本 英利, 横山 亘

    シーエムシー出版  2003年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機半導体の応用技術

    安達 千波矢, 河村 祐一郎, 合志 憲一

    シーエムシー出版  2003年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機ELディスプレイにおける高輝度・高効率・長寿命化技術 第4章[1]低分子系燐光材料及び高効率燐光発光素子

    合志 憲一, 安達 千波矢

    技術情報協会  2003年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • Organic Light Emitting Devices "Chapter 3"

    C.Adachi and T.Tsutsui(担当:共著)

    American Institute of Physics  2003年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機ディスプレイと材料 第10章 ”低分子蛍光色素系材料”

    城戸 淳二, 安達 千波矢(担当:共著)

    シーエムシー出版  2002年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • 有機EL材料とディスプレイ

    安達千波矢(担当:共著)

    ㈱シー・エム・シー 監修 城戸淳二  2001年2月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

  • エレクトロニクス関連色素―現状と将来展望―第6章 ”エレクトロルミネッセンス”

    安達 千波矢

    シーエムシー出版  1998年1月 

     詳細を見る

    記述言語:その他   著書種別:学術書

  • Electroluminescence in organic thin films "Photochemical Processes in Organized Molecular Systems"

    T.Tsutsui and C.Adachi(担当:共著)

    Elsevier Sci.Pub  1991年1月 

     詳細を見る

    記述言語:日本語   著書種別:学術書

▼全件表示

講演・口頭発表等

  • Anti-Stokes Emission Utilizing Reverse Intersystem Crossing

    木幡真太郎,中野谷一,細貝拓也,安田琢麿 , 土`屋 陽 一, 安達千波矢

    日本化学会  2025年3月 

     詳細を見る

    開催年月日: 2025年3月

    会議種別:口頭発表(一般)  

    開催地:関西大学   国名:日本国  

  • MDシミュレーションによる紫外レーザー材料の分子配向性の検討

    嘉屋 有晟,HyungSuk Kim, 千歳 洋平, Sebastien Chenais, Sebastien Forget Cyril Poriel

    第72回応用物理学会春季学術講演会  2025年3月 

     詳細を見る

    開催年月日: 2025年3月

    会議種別:ポスター発表  

    開催地:東京理科大学   国名:日本国  

  • Exciplex発光に対する重水素置換効果

    長嵜 優斗 ,中野谷 一,安達 千波矢

    第72回応用物理学会春季学術講演会  2025年3月 

     詳細を見る

    開催年月日: 2025年3月

    会議種別:ポスター発表  

    開催地:東京理科大学   国名:日本国  

  • ペロブスカイト太陽電池系における暗電流発生メカニズムの検討

    石田 諒

    第72回応用物理学会春季学術講演会  2025年3月 

     詳細を見る

    開催年月日: 2025年3月

    会議種別:ポスター発表  

    開催地:東京理科大学   国名:日本国  

  • Siリンカーを有する新規ホスト材料の開発

    石橋 和佳

    第72回応用物理学会春季学術講演会  2025年3月 

     詳細を見る

    開催年月日: 2025年3月

    会議種別:ポスター発表  

    開催地:東京理科大学   国名:日本国  

  • 有機半導体レーザー材料の濃度消光抑制によるASE閾値の低減化

    K. Ishii, K. Goushi, C. Adachi

    第72回応用物理学会春季学術講演会  2025年3月 

     詳細を見る

    開催年月日: 2025年3月

    会議種別:ポスター発表  

    開催地:東京理科大学   国名:日本国  

  • 有機薄膜積層CT構造における高導電特性と界面構造解析

    秋月 海翔,今岡 健太郎,亀山 真奈,安達 千波矢

    第72回応用物理学会春季学術講演会  2025年3月 

     詳細を見る

    開催年月日: 2025年3月

    会議種別:ポスター発表  

    開催地:東京理科大学   国名:日本国  

  • 熱活性化遅延蛍光薄膜からのアンチストークス発光

    金子実和,木幡真太郎,中野谷一 ,安達千波矢

    第72回応用物理学会春季学術講演会  2025年3月 

     詳細を見る

    開催年月日: 2025年3月

    会議種別:ポスター発表  

    開催地:東京理科大学   国名:日本国  

  • 室温程度の環境熱を活用した新機構有機熱電デバイスの開発

    亀山 真奈, 藤原 隆, 八尋 正幸 , Fabrice Mathevet ,安達 千波矢

    第72回応用物理学会春季学術講演会  2025年3月 

     詳細を見る

    開催年月日: 2025年3月

    会議種別:ポスター発表  

    開催地:東京理科大学   国名:日本国  

  • Triplet Harvesting TADF Emitters Towards Energy-Efficient Organic Electronics 国際会議

    CACEE-2024  2025年12月 

     詳細を見る

    開催年月日: 2024年12月

    記述言語:英語   会議種別:ポスター発表  

    開催地: Mumbai   国名:インド  

  • Core-shell Wavefunction Modulation Targetting Stable and Narrowband OLEDs 招待 国際会議

    Xun Tang, Masahiro Hayakawa, Takuji Hatakeyama, 安達 千波矢

    IDW'24  2024年12月 

     詳細を見る

    開催年月日: 2024年12月

    記述言語:英語   会議種別:ポスター発表  

    開催地:Sapporo Convention Center(札幌)   国名:日本国  

  • Unique TADF Behavior Around Zero Gap Between Singlet and Triplet Excited States 招待 国際会議

    安達 千波矢

    2024 MRS Fall Meeting  2024年12月 

     詳細を見る

    開催年月日: 2024年12月

    記述言語:英語   会議種別:ポスター発表  

    開催地:Hynes Convention Center   国名:アメリカ合衆国  

  • Rational molecular design for balanced locally excited and charge transfer character to achieve dual function of two-photon absorption and TADF 招待 国際会議

    Gomathi Vinayakam Mageswari, 千歳 洋平, 𡈽屋 陽一,安達 千波矢

    2024 MRS Fall Meeting  2024年12月 

     詳細を見る

    開催年月日: 2024年12月

    記述言語:英語   会議種別:ポスター発表  

    開催地:Hynes Convention Center   国名:アメリカ合衆国  

  • Organic Thermoelectric Device Utilizing Charge Transfer Interface as the charge generation by harvesting thermal energy 招待 国際会議

    亀山 真奈, Shun Kondo, Kentaro Imaoka, Yoko Shimoi, Fabrice Mathevet, Takashi Fujihara, Hiroshi Goto, 中野谷 一, Masayuki Yahiro, 安達 千波矢

    2024 MRS Fall Meeting  2024年12月 

     詳細を見る

    開催年月日: 2024年12月

    記述言語:英語   会議種別:ポスター発表  

    開催地:Hynes Convention Center   国名:アメリカ合衆国  

  • Enhanced effifiency of NIR-OLEDs by deuteration of both host and guest molecules 招待 国際会議

    田村 結花, 中野谷 一, 安達 千波矢

    2024 MRS Fall Meeting  2024年12月 

     詳細を見る

    開催年月日: 2024年12月

    記述言語:英語   会議種別:ポスター発表  

    開催地:Hynes Convention Center   国名:アメリカ合衆国  

  • Organic Thermoelectric Device Utilizing CT Interface as Charge Generation by Harvesting Thermal Energy 国際会議

    安達 千波矢

    A-COE 2024  2024年11月 

     詳細を見る

    開催年月日: 2024年11月

    記述言語:英語   会議種別:口頭発表(基調)  

    開催地:大阪公立大学   国名:日本国  

  • Exciton dynamics of TADF materials showing peculiar thermal behavior of PL decay 国際会議

    水越 啓斗, 土屋 陽一, Debasish Barman,安達 千波矢

    A-COE 2024  2024年11月 

     詳細を見る

    開催年月日: 2024年11月

    記述言語:英語   会議種別:ポスター発表  

    開催地:I-Site なんば   国名:日本国  

  • Rational molecular design strategy aimed at the compatibility of two-photon absorption phenomenon and TADF-based OLED application with planar triazine derivatives 国際会議

    千歳 洋平, 土屋 陽一,安達 千波矢

    A-COE 2024  2024年11月 

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    開催年月日: 2024年11月

    記述言語:英語   会議種別:ポスター発表  

    開催地:I-Site なんば   国名:日本国  

  • Emission Dipole Orientation for Polarization Tuning in Organic Lasers 国際会議

    Tuul Tsagaantsooj, Xun Tang, 安達 千波矢

    A-COE 2024  2024年11月 

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    開催年月日: 2024年11月

    記述言語:英語   会議種別:ポスター発表  

    開催地:I-Site なんば   国名:日本国  

  • Rational Design of Horizontally Oriented MRCT-type TADF Emitter Achieving EQE Over 40% for Sky-Blue OLED 国際会議

    DEBASISH BARMAN, 𡈽屋 陽一, 安達 千波矢

    ICEL2024  2024年11月 

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    開催年月日: 2024年11月

    記述言語:英語   会議種別:ポスター発表  

    開催地:京都大学   国名:日本国  

  • Expanding Charge Transfer Technology from TADF to Advanced Devices 国際会議

    安達 千波矢

    ICEL 2024  2024年11月 

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    開催年月日: 2024年11月

    記述言語:英語   会議種別:口頭発表(基調)  

    開催地:京都大学   国名:日本国  

  • Manipulating exciton recombination toward stable organic light-emitting diodes 国際会議

    Xun Tang, 安達 千波矢

    ICEL2024  2024年11月 

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    開催年月日: 2024年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:京都大学   国名:日本国  

  • Comprehensive molecular design aimed at high-performance Optoelectronic devices

    安達 千波矢

    McGill University  2024年11月 

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    開催年月日: 2024年11月

    記述言語:英語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:McGill University   国名:カナダ  

  • 高性能TADF-OLEDを目指した包括的分子設計

    安達 千波矢

    「有機EL 最新動向」WEB講習会  2024年10月 

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    開催年月日: 2024年10月

    記述言語:日本語  

    国名:日本国  

  • CT現象を基礎とした次世代有機エレクトロニクスの展開

    安達 千波矢

    CSJ化学フェスタ2024  2024年10月 

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    開催年月日: 2024年10月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:タワーホール船堀(東京)   国名:日本国  

  • Investigation on Photophysical Properties of 1,3,2,4 - Diazadiboretidine

    Hyunje Jung,Youichi Tsuhiya,Keito Mizukoshi,Yoshiaki Shoji,Takanori Fukushima,Chihaya Adachi

    第85回応用物理学会秋季学術講演会  2024年9月 

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    開催年月日: 2024年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:朱鷺メッセ 新潟コンベンションセンター   国名:日本国  

  • 有機熱電デバイスの原理検証と高性能化

    亀山 真奈,今岡 健太郎,安達 千波矢

    第85回応用物理学会秋季学術講演会  2024年9月 

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    開催年月日: 2024年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:朱鷺メッセ 新潟コンベンションセンター   国名:日本国  

  • TTU過程におけるアントラセンダイマーの濃度依存性

    原口 葵,合志 憲一,佐々木 祥真,安達 千波矢

    第85回応用物理学会秋季学術講演会  2024年9月 

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    開催年月日: 2024年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:朱鷺メッセ 新潟コンベンションセンター   国名:日本国  

  • 紫外有機半導体レーザーの開発

    嘉屋 有晟 ,安部 彩乃,千歳 洋平,Sebastien Chenais,Cyril Poriel,Fabrice Mathevet

    第85回応用物理学会秋季学術講演会  2024年9月 

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    開催年月日: 2024年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:朱鷺メッセ 新潟コンベンションセンター   国名:日本国  

  • 低閾値発振に向けた高速放射速度定数を有する分子の開発

    永野 昌宏 ,合志 憲一,安達 千波矢

    第85回応用物理学会秋季学術講演会  2024年9月 

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    開催年月日: 2024年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:朱鷺メッセ 新潟コンベンションセンター   国名:日本国  

  • 2光子吸収及びTADF特性を両立させるトリアジン誘導体の光物性

    善家 良太,千歳 洋平,安達 千波矢

    2024年光化学討論会  2024年9月 

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    開催年月日: 2024年9月

    記述言語:日本語   会議種別:ポスター発表  

    開催地:九州大学   国名:日本国  

  • 熱活性化遅延蛍光分子薄膜からのアンチストークス発光

    金子 美和, 木幡 真太郎, 中野谷 一, 安達千波矢

    2024年光化学討論会  2024年9月 

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    開催年月日: 2024年9月

    記述言語:日本語   会議種別:ポスター発表  

    開催地:九州大学   国名:日本国  

  • 特異な熱挙動を示すTADF材料の励起子ダイナミクス解析 招待

    𡈽�屋 陽一

    2024年光化学討論会  2024年9月 

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    開催年月日: 2024年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:九州大学   国名:日本国  

  • Development of Stable Blue OLED's and understanding TADF mechanism based on Photophysical Kinetic AnalysisDevelopment of Stable Blue OLED's and understanding TADF mechanism based on Photophysical Kinetic Analysis

    𡈽�屋 陽一

    TADF solutions Summer School  2024年8月 

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    開催年月日: 2024年8月

    会議種別:口頭発表(一般)  

    開催地:UNIVERISTY OF ST. ANDREWS   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • Comprehensive molecular design aimed at high-performance OLED and organic lasers 国際会議

    安達 千波矢

    Phosphor Safari 2024  2024年7月 

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    開催年月日: 2024年7月 - 2024年8月

    記述言語:英語   会議種別:口頭発表(基調)  

    開催地:National Taipei University of Technology   国名:台湾  

  • 二重増感による分子内三重項-三重項消滅アップコンバージョン(TTU)の検討

    原口 葵,合志 憲一,佐々木 祥真,安達 千波矢

    第61回 化学関連支部合同九州大会  2024年6月 

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    開催年月日: 2024年6月

    記述言語:日本語  

    開催地:北九州市   国名:日本国  

  • Suppressed gold penetration with the molybdenum oxide interlayer to increase power conversion efficiency of perovskite solar cells 国際会議

    #Badamgarav Purev-Ochir,@Jun Tae Song,@Pangpang Wang,@Masayuki Yahiro,@Sunao Yamada,@Hajime Nakanotani,@Toshinori Matsushima, @Chihaya Adachi

    International Conference on Science and Technology of Synthetic Electronic Materials 2024  2024年6月 

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    開催年月日: 2024年6月

    記述言語:英語   会議種別:ポスター発表  

    開催地:Dresden   国名:ドイツ連邦共和国  

  • Organic thermoelectric devices based on CT complexes 招待 国際会議

    安達 千波矢

    ICSM 2024  2024年6月 

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    開催年月日: 2024年6月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Dresden International Congress Center   国名:ドイツ連邦共和国  

  • 高効率・長寿命青色OLEDのための新規HBL/ETL材料の素子評価

    桐山 汐音,儘田 正史,合志 憲一,安達 千波矢

    第36回 有機EL討論会  2024年6月 

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    開催年月日: 2024年6月

    記述言語:日本語  

    開催地:東京国際交流館   国名:日本国  

  • Expanding Charge Transfer Technology from TADF to Advanced Devices 国際会議

    安達 千波矢

    M&BE11  2024年6月 

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    開催年月日: 2024年6月

    記述言語:英語   会議種別:口頭発表(基調)  

    開催地:松江テルサ旭町(島根県)   国名:日本国  

  • Efficient photosensitized luminescence from Eu3+ in inert nanocrystals via ligand coordination 国際会議

    K. Goushi,Y. Kashiwagi,C. Adachi

    M&BE11  2024年6月 

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    開催年月日: 2024年6月

    記述言語:英語  

    開催地:松江テルサ旭町(島根県)   国名:日本国  

  • Complex Spin-Flip Processes in Charge-Transfer-Type Organic Molecules

    Hyung Suk Kim,Sang Hoon Lee,Seunghyup Yoo,Chihaya Adachi

    有機EL討論会  2024年6月 

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    開催年月日: 2024年6月

    記述言語:英語  

    開催地:国際交流会議場 (東京 お台場)   国名:日本国  

  • Regioisomer Effect of Pyrene on Multi-Resonance Emitter for Hyperfluorescent OLEDs

    ChanHee Lee,Yi-Ting Lee,Chin-Yiu Chan,Youichi Tsuchiya,Sae Youn Lee,Chihaya Adachi

    「有機EL討論会」第38回例会 

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    開催年月日: 2024年6月

    記述言語:英語   会議種別:ポスター発表  

    開催地:東京国際交流館   国名:日本国  

  • Triplet dynamic model in organic solid-state lasers using thermally activated delayed fluorescence emitters under continuous-wave excitation 国際会議

    K. Goushi,A. Abe,A.S.D. Sandanayaka,R. Komatsu,T. Fujihara,M. Mamada,C. Adachi

    ISOME 2024  2024年5月 

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    開催年月日: 2024年5月

    記述言語:英語  

    開催地:情報通信研究機構 未来ICT研究所(神戸)   国名:日本国  

  • Anti-Stokes Luminescence in Multi-Resonance-Type Thermally-Activated Delayed Fluorescence Molecules 国際会議

    木幡真太郎,中野谷一,安達千波矢

    European Materials Research Society  2024年5月 

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    開催年月日: 2024年5月

    記述言語:英語  

    開催地:Convention & Exhibition Centre of Strasbourg (France)   国名:フランス共和国  

  • High electrical conductivity of NDI-based HOF structure

    今岡 健太郎,Fabrice Mathevet,安達 千波矢

    European Materials Research Society 2024 Spring  2024年5月 

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    開催年月日: 2024年5月

    記述言語:その他  

    開催地:Convention & Exhibition Centre of Strasbourg (France)   国名:フランス共和国  

  • Comprehensive molecular design aimed at high-performance Optoelectronic devices

    安達 千波矢

    QCAM Annual Meeting  2024年5月 

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    開催年月日: 2024年5月

    記述言語:英語   会議種別:口頭発表(基調)  

    開催地:Université Laval, Alphonse-Desjardins building   国名:アメリカ合衆国  

  • Comprehensive molecular design aimed at high-performance Optoelectronic devices

    安達 千波矢

    2024年5月 

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    開催年月日: 2024年5月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:University of Motreal   国名:カナダ  

  • Spin-Orbital Coupling Enhancement and Exciton Manipulating Targeting Narrowband and Highly Stable OLEDs 招待 国際会議

    Xun Tang,Chihaya Adachi

    SID Display Week Symposium  2024年5月 

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    開催年月日: 2024年5月

    記述言語:英語   会議種別:ポスター発表  

    開催地:San Jose   国名:アメリカ合衆国  

  • Expanding Science and Technology of CT Phenomena in Organic Optoelectronic Devices 国際会議

    安達 千波矢

    IC MD&D 2024  2024年5月 

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    開催年月日: 2024年5月

    記述言語:英語   会議種別:口頭発表(基調)  

    開催地:POSCO INTERNATIONAL CENTER    国名:大韓民国  

  • Efficient Metal Free Deep–Blue Multi–Resonance Thermally Activated Delayed Fluorescence Emitter for High–Performance Organic Light–Emitting Diodes

    #Rangani Wathsala Weerasinghe,@Subeesh M. Suresh,@Chin-Yiu Chan,@Youichi Tsuchiya,@Eli Zysman-Colman,@Chihaya Adachi,@David Hall

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:英語  

    開催地:東京都市大学   国名:日本国  

  • Highly efficient carbazole-based host material to improve molecular orientation for organic light-emitting diodes

    #Bhagya Madushani,@Masashi Mamada,@Chihaya Adachi,@Kenichi Goushi,@Hajime Nakanotani

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語  

    開催地:東京都市大学   国名:日本国  

  • Effect of laser wavelength tunability by distributed feed-back resonator dimensions

    #B. S. B. Karunathilaka,#N. Takeishi,@C. Adachi

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語  

    開催地:東京都市大学   国名:日本国  

  • NDI含有HOF構造の高導電特性 (High electrical conductivity of NDI-based HOF structure)

    #今岡 健太郎,@Fabrice Mathevet,@安達 千波矢

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語  

    開催地:東京都市大学   国名:日本国  

  • 有機熱電デバイスの原理検証と高性能化

    #亀山 真奈 ,#今岡 健太郎,@安達 千波矢

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語  

    開催地:東京都市大学   国名:日本国  

  • 可溶性有機半導体レーザーの開発

    #嘉屋 有晟 ,@Fabrice Mathevet,@安達 千波矢

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語  

    開催地:東京都市大学   国名:日本国  

  • 熱活性化遅延蛍光分子におけるアンチストークス発光

    #木幡真太郎,@中野谷一,@安達千波矢

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語  

    開催地:東京都市大学   国名:日本国  

  • ホストおよびゲスト分子の重水素化によるNIR-OLEDの高効率化

    #田村結花,@中野谷一,@安達千波矢

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語  

    開催地:東京都市大学   国名:日本国  

  • Manipulating Exciton Recombination Toward Narrowband and High-Stability Organic Light-Emitting Diodes

    @Xun Tang,@安達千波矢

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:英語  

    開催地:東京都市大学   国名:日本国  

  • Unique exciplex characteristics formed by simultaneous excitation of donor and Unique exciplex characteristics formed by simultaneous excitation of donor and acceptor units

    #Tharindu P. B. Rajakaruna,@Xun Tang,@安達千波矢

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:英語  

    開催地:東京都市大学   国名:日本国  

  • 特異な熱挙動を示すTADF 材料の詳細な速度論解析

    #土屋 陽一,#水越 啓斗 ,西郷 将生,笠 僚宏,宮田 潔志,@恩田 建,@安達 千波矢

    JSAP Spring meeting 2024  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語  

    開催地:東京都市大学   国名:日本国  

  • 熱活性化遅延蛍光分子の進展:有機EL からフォトンアップコンバージョン 招待

    @安達 千波矢

    日本化学会第104回春季年会  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:日本大学理工学部 船橋キャンパス   国名:日本国  

  • 電子求引性トリアジン誘導体の開発と近赤外2光子応答性TADF発光材料への応用 Development of Triazine Derivatives Bearing Electron-Withdrawing Substituent and Their Application to TADF Emitter with Near-Infrared Two-Photon Absorption Character

    @千歳洋平,@土屋陽一,@安達千波矢

    日本化学会 第104春季年会 (2024)  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語  

    国名:日本国  

  • 熱活性化遅延蛍光分子の進展:有機EL からフォトンアップコンバージョン 招待

    @中野谷 一

    日本化学会 第104春季年会 (2024)  2024年3月 

     詳細を見る

    開催年月日: 2024年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  • OLEDにおけるCT相互作用の重要性と高性能化 招待

    @安達 千波矢

    第394回蛍光体同学会講演会  2024年3月 

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    開催年月日: 2024年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:慶応義塾大学   国名:日本国  

  • Judicious Design of Pyridine-based Hosts for Stable and Low-driving Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes

    @Chihaya Adachi,@Chin-Yiu Chan,@Youichi Tsuchiya,@Gerardus N. Iswara Lestanto,#Yanmei Hu,@Alexander Civil,@Yufang Li

    Advanced Optical Materials  2024年2月 

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    開催年月日: 2024年2月

    記述言語:英語  

    開催地:Advanced Optical Materials   国名:日本国  

  • 有機EL ーどうする!?有機ELー 招待

    @安達 千波矢

    有機エレクトロニクス研究会  2023年12月 

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    開催年月日: 2023年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京工業大学   国名:日本国  

  • Science and Technology of CT Phenomena in OLEDs 招待 国際会議

    @安達 千波矢

    IWPDS  2023年12月 

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    開催年月日: 2023年12月 - 2024年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Indian Institute of Technology Madras   国名:インド  

  • Expanding Science and Technology of CT Phenomena in Organic Optoelectronic Devices 招待 国際会議

    @安達 千波矢

    日中有機半導体会議  2023年12月 

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    開催年月日: 2023年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:名古屋大学   国名:日本国  

  • A Multiple Resonance Thermally Activated Delayed Fluorescence Core Toward Stable Organic Electroluminescence and Lasing 国際会議

    @Xun Tang,@Chihaya Adachi

    日中有機半導体シンポジウム  2023年12月 

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    開催年月日: 2023年12月

    記述言語:日本語  

    開催地:名古屋大学   国名:日本国  

  • Efficient Intramolecular Triplet-Triplet Annihilation Upconversion of Anthracene Dimers in Organic Light-Emitting Diodes 招待 国際会議

    @合志 憲一,#佐々木 祥真,@儘田 正史,@安達 千波矢

    IDW 2023  2023年12月 

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    開催年月日: 2023年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:新潟朱鷺メッセ   国名:日本国  

  • Development of Triazine-Based TADF Emitter with Near-Infrared Two-Photon Absorption Character

    @千歳洋平

    FY2023 WPI Academy Site Visit  2023年12月 

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    開催年月日: 2023年12月

    記述言語:日本語  

    開催地:Site Visit   国名:日本国  

  • 熱活性化遅延蛍光材料を用いたOLEDの最近の動向 招待

    @安達 千波矢

    近畿化学協会 公開講演会  2023年11月 

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    開催年月日: 2023年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪科学技術センター   国名:日本国  

  • Expanding Science and Technology of CT Phenommena in OLEDs 招待 国際会議

    @安達 千波矢

    A-COE2023  2023年10月 

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    開催年月日: 2023年10月 - 2023年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:台北   国名:台湾  

  • Oxygen-Induced Reversible Degradation of Perovskite Solar Cells 国際会議

    #Badamgarav Purev-Ochir,#Xuelong Liu,Yuki Fujita,Dai Semba,Telugu Bhim Raju,Ganbaatar Tumen-Ulzii,@Atsushi Wachi,@Toshinori Matsushima,@Chihaya Adachi

    The 15th Asian Conference on Organic Electronics  2023年10月 

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    開催年月日: 2023年10月 - 2023年11月

    記述言語:英語  

    国名:台湾  

  • Stabilities of TADF molecules based on multiple donor-acceptor design. 国際会議

    #Bhagya Madushani,@Masashi Mamada,@Chihaya Adachi

    The 15th Asian Conference on Organic Electronics  2023年10月 

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    開催年月日: 2023年10月 - 2023年11月

    記述言語:英語  

    国名:台湾  

  • Abrupt exciton quenching in blue fluorescent organic light-emitting diodes around turn-on voltage region 国際会議

    #角町 駿太,#Thanh Ba Nguyen,@中野谷 一,@安達 千波矢

    The 15th Asian Conference on Organic Electronics  2023年10月 

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    開催年月日: 2023年10月 - 2023年11月

    記述言語:英語  

    国名:台湾  

  • Mechanism elucidation of TADF materials showing abnormal thermal behavior 国際会議

    #Keito Mizukoshi,@Youichi Tsuchiya,Masaki Saigo,Tomohiro Ryu,Kiyoshi Miyata,Ken Onda,@Chihaya Adachi

    The 15th Asian Conference on Organic Electronics  2023年10月 

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    開催年月日: 2023年10月 - 2023年11月

    記述言語:英語  

    国名:台湾  

  • Efficient Intramolecular Triplet-Triplet Annihilation Upconversion based on Anthracene Dimers and Their Molecular Structure Dependence 国際会議

    #Shoma Sasaki,@Kenichi Goushi,@Masashi Mamada,Shiori Miyazaki,Kiyoshi Miyata,Ken Onda,@Chihaya Adachi

    The 15th Asian Conference on Organic Electronics  2023年10月 

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    開催年月日: 2023年10月 - 2023年11月

    記述言語:英語  

    国名:台湾  

  • Fine photophysical analysis of peculiar TADF behavior 招待 国際会議

    @Youichi Tsuchiya,#Keito Mizukoshi,Masaki Saigo,Tomohiro Ryu,Kiyoshi Miyata,Ken Onda,@Chihaya Adachi

    The 15th Asian Conference on Organic Electronics  2023年10月 

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    開催年月日: 2023年10月 - 2023年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:台湾  

  • アントラセンダイマー分子における高効率な分子内三重項-三重項アップコンバージョンと分子構造依存性

    #佐々木 祥真,@合志 憲一,@儘田 正史,#宮崎 栞,#宮田 潔志,#恩田 健,@安達 千波矢

    第18回有機デバイス・物性院生研究会  2023年10月 

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    開催年月日: 2023年10月

    記述言語:日本語  

    開催地:広島大学   国名:日本国  

  • ハロゲン結合を用いた共結晶化と重水素化が発光特性に与える影響

    #安部彩乃,@合志健一,@儘田正史,@安達千波矢

    第18回有機デバイス・物性院生研究会  2023年10月 

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    開催年月日: 2023年10月

    記述言語:日本語  

    開催地:広島大学   国名:日本国  

  • NDIベース材料の電気特性に関する研究 (A new type of organic conductor composed of an NDI-based HOF structure)

    #今岡 健太郎,@Fabrice Mathevet,@安達 千波矢

    第18回有機デバイス・物性院生研究会  2023年10月 

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    開催年月日: 2023年10月

    記述言語:日本語  

    開催地:広島大学   国名:日本国  

  • 熱活性化遅延蛍光分子におけるアンチストークス発光

    #木幡真太郎,@中野谷 一,@安達 千波矢

    第18回有機デバイス・物性院生研究会  2023年10月 

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    開催年月日: 2023年10月

    記述言語:日本語  

    国名:日本国  

  • 近赤外有機EL素子の進展 招待

    @中野谷 一

    第18回有機デバイス・物性院生研究会  2023年10月 

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    開催年月日: 2023年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:広島大学   国名:日本国  

  • 青色蛍光OLEDの駆動電圧付近で生じる急激な励起消滅過程

    #角町 駿太 ,#Thanh Ba Nguyen,@中野谷 一,@安達 千波矢

    第84回 応用物理学会 秋季学術講演会  2023年9月 

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    開催年月日: 2023年9月

    記述言語:日本語  

    国名:日本国  

  • Luminescence mechanism of TADF molecules showing peculiar thermal behavior 招待 国際会議

    @安達 千波矢

    14th International Conference on Optical Probes of Organic and Hybrid Semiconductors (OP2023)  2023年9月 

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    開催年月日: 2023年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:イタリア   国名:イタリア共和国  

  • Luminescence mechanism of TADF molecules showing peculiar thermal behavior 招待 国際会議

    @Youichi Tsuchiya,#Keito Mizukoshi,Tomohiro Ryu,Kiyoshi Miyata,Ken Onda,@Chihaya Adachi

    14th International Conference Conference on Optical Probes of Organic and Hybrid Semiconductors (OP2023)  2023年9月 

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    開催年月日: 2023年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:イタリア共和国  

  • Detail photophysical kinetic analysis of TADF material showing abnormal thermal behavior

    @Youichi Tsuchiya,#Keito Mizukoshi,Tomohiro Ryu,Kiyoshi Miyata,Ken Onda,@Chihaya Adachi

    2023年光化学討論会  2023年9月 

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    開催年月日: 2023年9月

    記述言語:日本語  

    開催地:広島国際会議場   国名:日本国  

  • 結晶構造制御による室温りん光量子収率の向上

    #安部彩乃,@合志健一,@儘田正史,@安達千波矢

    2023年光化学討論会  2023年9月 

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    開催年月日: 2023年9月

    記述言語:日本語  

    開催地:広島国際会議場   国名:日本国  

  • 近赤外領域に2光子吸収能を有するトリアジン型TADF材料の開発

    @千歳洋平,@土屋陽一,@安達千波矢

    2023年光化学討論会  2023年9月 

     詳細を見る

    開催年月日: 2023年9月

    記述言語:日本語  

    開催地:広島国際会議場   国名:日本国  

  • Research on Anti-Stokes Luminescence in Thermally Activated Delayed Fluorescence Molecules

    #木幡真太郎,@中野谷一,@安達千波矢

    2023年光化学討論会  2023年9月 

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    開催年月日: 2023年9月

    記述言語:日本語  

    開催地:広島国際会議場   国名:日本国  

  • アントラセンダイマーからの高効率な分子内三重項-三重項アップコンバージョンおよび発光素子への応用(Efficient intramolecular triplet-triplet annihilation up-conversion from dimer molecules and application to emitting devices)

    #佐々木 祥真,@合志 憲一,@儘田 正史,@安達 千波矢

    2023年光化学討論会  2023年9月 

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    開催年月日: 2023年9月

    記述言語:日本語  

    開催地:広島国際会議場   国名:日本国  

  • Long-range exciplex system with an altra-thin insulating layer 国際会議

    #Tharindu P. B. Rajakaruna,@Tang Xun,@Chihaya Adachi

    KJF International Conference on Organic Materials for Electronics and Photonics 2023  2023年8月 

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    開催年月日: 2023年8月 - 2023年9月

    記述言語:英語  

    開催地:九州大学医学部百周年記念ホール   国名:日本国  

  • Oxygen-Induced Reversible Degradation of Perovskite Solar Cells 国際会議

    #Badamgarav Purev-Ochir, @Xuelong Liu,@Yuki Fujita,@Dai Semba,@Telugu Bhim Raju,@Ganbaatar Tumen-Ulzii

    KJF International Conference on Organic Materials for Electronics and Photonics 2023  2023年8月 

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    開催年月日: 2023年8月 - 2023年9月

    記述言語:英語  

    開催地:九州大学医学部百周年記念ホール   国名:日本国  

  • Multiple donor-acceptor design for highly luminescent and stable thermally activated delayed fluorescence 国際会議

    #Bhagya Madushani,@Masashi Mamada,@Chihaya Adachi

    KJF International Conference on Organic Materials for Electronics and Photonics 2023  2023年8月 

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    開催年月日: 2023年8月 - 2023年9月

    記述言語:英語  

    開催地:九州大学医学部百周年記念ホール   国名:日本国  

  • Insight into Spin-Flip Processes at High-lying Triplet State for Charge-Transfer Molecule 国際会議

    #Hyung Suk Kim,#Sang Hoon Lee,Seunghyup Yoo,@Chihaya Adachi

    KJF International Conference on Organic Materials for Electronics and Photonics 2023  2023年8月 

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    開催年月日: 2023年8月 - 2023年9月

    記述言語:英語  

    開催地:九州大学医学部百周年記念ホール   国名:日本国  

  • Invstigation of Functional Groups Effect on Multiple Resonance Terminal Emitter for Hyperfluorescence Organic Light-Emitting Diodes 国際会議

    #ChanHee Lee,#Minho Jang,Chae Won Park,#Hyung Suk Kim,#Chin-Yiu Chan,@Youichi Tsuchiya

    KJF International Conference on Organic Materials for Electronics and Photonics 2023  2023年8月 

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    開催年月日: 2023年8月 - 2023年9月

    記述言語:英語  

    開催地:九州大学医学部百周年記念ホール   国名:日本国  

  • Understanding of Phosphor-Sensitized Fluorescence Mechanism in Blue Organic Light-Emitting Diodes 国際会議

    #Sang Hoon Lee,#Hyung Suk Kim,@Chihaya Adachi

    KJF International Conference on Organic Materials for Electronics and Photonics 2023  2023年8月 

     詳細を見る

    開催年月日: 2023年8月 - 2023年9月

    記述言語:英語  

    開催地:九州大学医学部百周年記念ホール   国名:日本国  

  • Comprehensive Understading of Spin-Flip Processes in Charge-Trasnfer Molecule 国際会議

    #Hyung Suk Kim,#Sang Hoon Lee,#Seunghyup Yoo,@Chihaya Adachi

    The 23rd International Meeting on Information Display (IMID)  2023年8月 

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    開催年月日: 2023年8月 - 2024年8月

    記述言語:日本語  

    開催地:BEXCO, Busan, Korea   国名:大韓民国  

  • Development of Exciton Process Aimed at High-Performance TADF and Hyperfluorescence OLEDs 招待 国際会議

    @安達 千波矢

    ICP2023  2023年7月 

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    開催年月日: 2023年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:札幌   国名:日本国  

  • OLEDー材料・デバイスの進展、そして未来への展開ー 招待

    @安達 千波矢

    第482回光産業技術マンスリーセミナー  2023年7月 

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    開催年月日: 2023年7月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • マルチドナー型TADF分子における立体障害の効果

    #矢田佐和子,@儘田正史,@安達千波矢

    第60回化学関連支部合同九州大会  2023年7月 

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    開催年月日: 2023年7月

    記述言語:日本語  

    開催地:北九州国際会議場   国名:日本国  

  • Tailor-made Multi-Resonance Terminal Emitters Towards Narrowband, HighEfficiency, and Stable Hyperfluorescence Organic Light-Emitting Diodes

    @Yi-Ting Lee,@Chin-Yiu Chan,@Chihaya Adachi

    有機EL討論会 第34回例会  2023年6月 

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    開催年月日: 2023年6月 - 2023年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 異常な熱挙動を示す TADF 分子の発光メカニズムの解明

    #水越 啓斗,@土屋 陽一,#笠 僚宏,#宮田 潔志,#恩田 健,@安達 千波矢

    第36回 有機EL討論会  2023年6月 

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    開催年月日: 2023年6月 - 2024年6月

    記述言語:日本語  

    開催地:東京国際交流館   国名:日本国  

  • Enhancing TTU-OLED performances by utilizing TADF Materials

    #Thanh Ba Nguyen,@Hajime Nakanotani,#Chin-Yiu Chan,#Shunta Kakumachi,@Chihaya Adachi

    「有機EL討論会」第36回例会  2023年6月 

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    開催年月日: 2023年6月 - 2023年4月

    記述言語:英語  

    開催地:東京国際交流館   国名:日本国  

  • Advanced Molecular Design of Organic Laser Materials Aimed at Current-Driven Lasing 招待 国際会議

    @安達 千波矢

    GRC  2023年6月 

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    開催年月日: 2023年6月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:アメリカ合衆国  

  • OLED Materials Ⅲ 招待 国際会議

    @安達 千波矢

    SID  2023年5月 

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    開催年月日: 2023年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:アメリカ合衆国  

  • Precise control of CT states in organic molecules aimed at high-performance optoelectronic devices 招待 国際会議

    @安達 千波矢

    APME  2023年4月 

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    開催年月日: 2023年4月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Campus des Cordeliers (パリ)   国名:フランス共和国  

  • Hyperfluorescence OLEDs Aimed at High-Performance Blue Emission 招待 国際会議

    @安達 千波矢

    MRS  2023年4月 

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    開催年月日: 2023年4月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:サンフランシスコ   国名:アメリカ合衆国  

  • Molecular Donor-Acceptor Interaction for Realizing Low Threshold Organic Lasers from Visible to Near-Infrared regime 招待 国際会議

    @Xun Tang,@Chihaya Adachi

    The 12th Laser Display and Lighting Conference 2023 (LDC2023)  2023年4月 

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    開催年月日: 2023年4月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:PACIFICO Yokohama   国名:日本国  

  • OLEDの到達点から有機半導体レーザーへの展開 招待

    @安達 千波矢

    『光の日』シンポジウム(第333回研究会)  2023年3月 

     詳細を見る

    開催年月日: 2023年3月

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:東京都   国名:日本国  

  • Enhancing OLEDs Lifetime by Expanding CT Interface with TADF Assistant Dopant

    #Nguyen Ba Thanh, @Hajime Nakanotani, @Chihaya Adachi

    The 70th JSAP Spring Meeting 2023  2023年3月 

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    開催年月日: 2023年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • ダイマー骨格による分子内三重項 三重項 励起子アップコンバージョンと有機ELへの応用

    #佐々木 祥真, @合志 憲一, @儘田 正史, @安達 千波矢

    第70回応用物理学会春季学術講演会  2023年3月 

     詳細を見る

    開催年月日: 2023年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都   国名:日本国  

  • ハロゲン結合と発光効率の関係に基づく室温りん光性有機共結晶の開発

    #安部 彩乃, @合志 憲一, @儘田 正史, @安達 千波矢

    有機エレクトロニクス研究会(OME)  2023年3月 

     詳細を見る

    開催年月日: 2023年3月

    記述言語:日本語  

    開催地:オンライン   国名:日本国  

  • 電荷移動錯体を活用した新型有機熱電素子

    #近藤 駿, @八尋 正幸, @L. M. Andersson, @後藤 博史, @安達 千波矢

    第70回応用物理学会春季学術講演会  2023年3月 

     詳細を見る

    開催年月日: 2023年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都   国名:日本国  

  • Hyperfluorescence OLEDs aimed at high-performance blue emission 招待 国際会議

    @Chihaya Adachi

    Colloquium Seminar for the Spring semester of Materials Science & Engineering department of Seoul National University  2023年3月 

     詳細を見る

    開催年月日: 2023年3月

    記述言語:英語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:Soeul   国名:大韓民国  

  • Molecular Interactions in Donor-Acceptor-Donor Skeletons Toward Near-Infrared Organic Lasers

    @Xun Tang, @Chihaya Adachi

    The 70th JSAP Spring Meeting 2023  2023年3月 

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    開催年月日: 2023年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都   国名:日本国  

  • Photophysical property of 4CzIPN single crystal

    #Kohata Shintaro, @Nakanotani Hajime, @Adachi Chihaya

    1st Q-PIT photofunction integration workshop  2023年2月 

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    開催年月日: 2023年2月

    記述言語:英語  

    国名:日本国  

  • Ternary cocrystal engineering of room temperature phosphorescence

    #Ayano Abe, @Kenichi Goushi, @Masashi Mamada, Chihaya Adachi

    1st Q-PIT photofunction integration workshop  2023年2月 

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    開催年月日: 2023年2月

    記述言語:英語  

    開催地:佐賀県   国名:日本国  

  • 熱活性化遅延蛍光材料の精密速度論に基づく光物性とデバイス物性解析 招待

    @𡈽屋 陽一, @安達 千波矢

    電子情報通信学会(有機エレクトロニクス研究会 (OME)、誘電・絶縁材料研究会)  2023年1月 

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    開催年月日: 2023年1月 - 2022年1月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:愛知県   国名:日本国  

  • 有機発光デバイスの基礎 招待

    @安達 千波矢

    化学技術基礎講座2022  2022年12月 

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    開催年月日: 2022年12月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:オンライン   国名:日本国  

  • Stable Blue Hyperfluorescence Organic Light-emitting Diodes 招待 国際会議

    @Chin-Yiu Chan, @Yi-Ting Lee, @Masaki Tanaka, @Hajime Nakanotani, @Chihaya Adachi

    A-COE 2022  2022年12月 

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    開催年月日: 2022年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 有機光エレクトロニクス 招待

    @安達 千波矢

    応用物理学会セミナー  2022年12月 

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    開催年月日: 2022年12月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:東京都   国名:日本国  

  • OLEDの過去・現在・そして未来へ 招待

    @安達 千波矢

    相模中央化学研究所講演会  2022年12月 

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    開催年月日: 2022年12月

    記述言語:日本語  

    開催地:神奈川県   国名:日本国  

  • 有機発光デバイスの基礎 招待

    @安達 千波矢

    第253回JOEM案内 有機エレクトロニクスアカデミー  2022年11月 

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    開催年月日: 2022年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Ternary cocrystal engineering of room temperature phosphorescence 国際会議

    #Ayano Abe, @Kenichi Goushi, @Masashi Mamada, @Chihaya Adachi

    ICONO13/ICOPE2022  2022年11月 

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    開催年月日: 2022年11月

    記述言語:英語  

    開催地:奈良県   国名:日本国  

  • 有機ELにおける分子内三重項 -三重項アップコンバージョン

    #佐々木 祥真, @合志 憲一, @儘田 正史, @安達 千波矢

    有機EL討論会 第35回例会  2022年11月 

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    開催年月日: 2022年11月

    記述言語:日本語  

    開催地:石川県   国名:日本国  

  • Exciton processes in Hyperfluorescence OLEDs aimed at high performance 招待 国際会議

    @Chihaya Adachi

    ICEL2022  2022年11月 

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    開催年月日: 2022年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:London   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • 速度定数の精密解析による先進TADFの分子設計 招待

    @𡈽屋 陽一, @安達 千波矢

    有機エレクトロニクスシンポジウム2022(高分子学会有機エレクトロニクス研究会)  2022年10月 

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    開催年月日: 2022年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都   国名:日本国  

  • 弱アクセプター構造を用いた深青TADF 材料の創出とOLED 特性

    @儘田 正史, @片桐 洋史, @Chan Chin-Yiu, @Lee Yi-Ting, @合志 憲一, @中野谷 一, @畠山 琢次, @安達 千波矢

    光化学討論会  2022年9月 

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    開催年月日: 2022年9月

    記述言語:日本語  

    開催地:京都   国名:日本国  

  • Excited-state quenching and laser properties of 1-naphthylmethylamine-based quasi-2D perovskite films 国際会議

    #Ryotaro Nasu, @Chathuranganie A. M. Senevirathne, @Toshinori Matsushima, @Chihaya Adachi

    SSDM2022  2022年9月 

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    開催年月日: 2022年9月

    記述言語:英語  

    開催地:千葉県   国名:日本国  

  • Investigation of charge transport properties in a Dion−Jacobson-type 2D organicinorganic perovskite

    #Xuelong Liu, @Narayanaswamy Kamatham, @David Keher, @Fabrice Mathevet, @Chihaya Adachi

    The 83rd JSAP Autumn Meeting 2022  2022年9月 

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    開催年月日: 2022年9月

    記述言語:英語  

    開催地:宮城   国名:日本国  

  • Improved operational stability of perovskite solar cells at high temperature 国際会議

    #Yuki Fujita, @Ganbaatar Tumen-Ulzii, @Toshinori Matsushima, @Chihaya Adachi

    SSDM2022  2022年9月 

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    開催年月日: 2022年9月

    記述言語:英語  

    開催地:千葉県   国名:日本国  

  • ペロブスカイト膜における低温レーザー発振特性

    #奈須 龍太郎, @松島 敏則, @安達 千波矢

    第83回応用物理学会秋季学術講演会  2022年9月 

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    開催年月日: 2022年9月

    記述言語:日本語  

    開催地:オンライン   国名:日本国  

  • ペロブスカイト太陽電池の高温保存安定性の向上

    #藤田 悠希, @松島 敏則, @,安達 千波矢

    第83回応用物理学会秋季学術講演会  2022年9月 

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    開催年月日: 2022年9月

    記述言語:日本語  

    開催地:オンライン   国名:日本国  

  • Stability Management in Hyperfluorescence OLEDs 招待 国際会議

    @Chihaya Adachi

    28. Lecture Conference on Photochemistry  2022年9月 

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    開催年月日: 2022年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:Düsseldorf   国名:ドイツ連邦共和国  

  • 有機薄膜中での自発的な励起子解離現象とその応用

    @中野谷 一,@安達 千波矢

    第71回高分子討論会  2022年9月 

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    開催年月日: 2022年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:北海道   国名:日本国  

  • Zero to One のイノベーションから大学発スタートアップへー革新的なOLED発光分子の創製と事業化ー 招待

    @安達 千波矢

    PARKSキックオフシンポジウム  2022年8月 

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    開催年月日: 2022年8月

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:福岡県   国名:日本国  

  • Controlling the Average Number of Spin-Circulation in Thermally Activated Delayed Fluorescence by Purcell Effect 国際会議

    #Hyung Suk Kim, #Sang Hoon Lee, @Yeonghoon Jin, @Soyeon Kim, @Youichi Tsuchiya, @Jihoon Lee, @Kyoungsik Yoo, @Chihaya Adachi, @Seunghyup Yoo

    KJF-ICOMEP 2022  2022年8月 

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    開催年月日: 2022年8月

    記述言語:英語  

    開催地:Jeju   国名:大韓民国  

  • Multiple resonance type thermally activated delayed fluorescence nature on dibenzo[1,4]azaborine derivatives and their OLED performance 国際会議

    #Jaehyun Bae, @Mika Sakai, @Xian-kai Chen, @Youichi Tsuchiya, @Shigehiro Yamaguchi, @Chihaya Adachi

    KJF-ICOMEP2022  2022年8月 

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    開催年月日: 2022年8月

    記述言語:英語  

    開催地:Jeju   国名:大韓民国  

  • Universal photophysical kinetic analysis for thermally activated delayed fluorescence 招待 国際会議

    @Youichi Tsuchiya, @Stefan Diesing, @Eli Zysman-Colman, @Ifor Samuel, @Chihaya Adachi

    SPIE Organic Photonics + Electronics  2022年8月 

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    開催年月日: 2022年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:California   国名:アメリカ合衆国  

  • Isotope Effect on Device Stability of Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes 国際会議

    #Xuelong Liu, @Chin-Yiu Chan, @Fabrice Mathevet, @Chihaya Adachi

    ICSM 2022  2022年7月 

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    開催年月日: 2022年7月

    記述言語:英語  

    開催地:Glasgow   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • Time-resolved spectroscopic study on emission mechanism in Eu(III)-complex-doped films for OLED applications 国際会議

    #Shiori Miyazaki, @Kiyoshi Miyata, @Yuichi Kitagawa, @Kenichi Goushi, @Chihaya Adachi, @Seiya Hasegawa, @Ken Onda

    ICSM 2022  2022年7月 

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    開催年月日: 2022年7月

    記述言語:日本語  

    開催地:Glasgow   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • Triplet management aiming for CW operation in organic solid-state lasers 国際会議

    #Ayano Abe, @Ryutaro Komatsu, @Takashi Fujihara, @Kenichi Goushi, @Anthony D'Aléo, @Chihaya Adachi

    ISCM2022  2022年7月 

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    開催年月日: 2022年7月

    記述言語:英語  

    開催地:Glasgow   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene単結晶の光物性

    #木幡 真太郎, @中野谷 一, @安達 千波矢

    日本化学会九州支部  2022年7月 

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    開催年月日: 2022年7月

    記述言語:日本語  

    開催地:北九州市   国名:日本国  

  • Zero to One の発想で未来を切り拓こう-有機光エレクトロニクスの最前線- 招待

    @安達 千波矢

    東進ハイスクール研究会  2022年7月 

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    開催年月日: 2022年7月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:東京都   国名:日本国  

  • Excited-state structural dynamics and thermally activated delayed fluorescence in solid-state for donor-acceptor type molecules 国際会議

    #Masaki Saigou, @Kiyoshi Miyata, @Hajime Nakanotani, @Chihaya Adachi, @Ken Onda

    ICSM 2022  2022年7月 

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    開催年月日: 2022年7月

    記述言語:英語  

    開催地:Glasgow   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • Characterization of excited states in TADF molecules with dual emission using time-resolved infrared spectroscopy 国際会議

    #Tomohiro Ryu, @Yuushi Shimoda, #Masaki Saigou, @Ryota Fukuda, @Kiyoshi Miyata, @Upuichi Tsuchiya, @Hajime Nakanotani, @Chihaya Adachi, @Ken onda

    ICSM 2022  2022年7月 

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    開催年月日: 2022年7月

    記述言語:英語  

    開催地:Glasgow   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • Recent progress of blue hyperfluorescence OLED 招待 国際会議

    @Chihaya Adachi

    ICSM2022  2022年7月 

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    開催年月日: 2022年7月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:Glasgow   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • The past, present and future prospects of organic optoelectronics 招待 国際会議

    @Chihaya Adachi

    Curious2022  2022年7月 

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    開催年月日: 2022年7月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:Darmstadt   国名:ドイツ連邦共和国  

  • The past, present and future prospects of organic light emitting diodes 招待 国際会議

    @Chihaya Adachi

    'ICPOC-25  2022年7月 

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    開催年月日: 2022年7月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:オンライン   国名:日本国  

  • Wavefunction-tuning and triplet-scavenging in donor-acceptor molecules toward organic lasers and OLEDs under high current injection 国際会議

    @Xun Tang, @Chihaya Adachi

    Glasgow  2022年7月 

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    開催年月日: 2022年7月

    記述言語:英語  

    開催地:Glasgow   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • Universal TADF Kinetic Analysis on Three-state System 国際会議

    @Youichi Tsuchiya, @Stefan Diesing, @Hironori Kaji, @Eli Zysman-Colman, @Ifor D. W. Samuel, @Chihaya Adachi

    ICSM 2022  2022年7月 

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    開催年月日: 2022年7月

    記述言語:英語  

    開催地:Glasgow   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • Deep-Blue Thermally Activated Delayed Fluorescence Emitters Aimed at Narrow Fluorescence-like Emission

    @Chin-Yiu Chan,@Yi-Ting Lee,@Masashi Mamada,@Kenichi Goushi,@Youichi Tsuchiya,@Hajime Nakanotani,@Chihaya Adachi

    有機EL討論会第34回例会  2022年5月 

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    開催年月日: 2022年6月 - 2023年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • OLEDー過去・現在・未来へー 招待

    @安達 千波矢

    RISMセミナー  2022年6月 

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    開催年月日: 2022年6月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:長野県   国名:日本国  

  • Synthesis, Aromaticity and Application to OFET and OLED of Peri-Pentacenopentacene 招待 国際会議

    @Masashi Mamada,@Tanguy Jousselin-Oba,@Karen Wright,@Jérome Marrot,@Chihaya Adachi,@Abderrahim Yassar,@Michel Frigoli

    241st ECS Meeting  2022年5月 

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    開催年月日: 2022年5月 - 2022年6月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 未来に広がる有機光エレクトロニクス 招待

    @安達 千波矢

    Q-AOSブラウンバックセミナー  2022年4月 

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    開催年月日: 2022年4月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • OLEDs and Future Prospect of Organic Optoelectronics 招待 国際会議

    @Chihaya Adachi

    APSURS – SUSL 2022  2022年4月 

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    開催年月日: 2022年4月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:オンライン   国名:日本国  

  • 有機半導体レーザーの材料・デバイス設計 招待

    @安達 千波矢

    レーザーEXPO2022  2022年4月 

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    開催年月日: 2022年4月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神奈川県   国名:日本国  

  • 革新的な材料創成による有機発光デバイスの高性能化 招待

    安達 千波矢

    応用物理学会 受賞記念講演  2022年3月 

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    開催年月日: 2022年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Recent progress on blue hyperfluorescence OLEDs 招待 国際会議

    Chihaya Adachi

    nanoGe Spring Meeting  2022年3月 

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    開催年月日: 2022年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Low-threshold exciton-polariton condensate via fast polariton relaxation in organic microcavities

    #Tomohiro Ishii, @Kiyoshi Miyata, @Masashi Mamada, @Fatima Bencheikh, @Fabrice Mathevet, @Ken Onda, @Stéphane Kéna-Cohen, @Chihaya Adachi

    APS March Meeting 2022  2022年3月 

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    開催年月日: 2022年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 有機マイクロ共振器中における励起子ポラリトンとその Bose-Einstein 凝縮の制御に関する研究 招待

    #石井智大, @安達千波矢

    第69回応用物理学会春季学術講演会  2022年3月 

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    開催年月日: 2022年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 革新的な材料創成によるOLEDの高性能化 招待

    安達 千波矢

    将来加工技術第136委員会 最終記念シンポジウム  2022年1月 

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    開催年月日: 2022年1月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Operation mechanism of Hyperfluorescence OLEDs 招待 国際会議

    Chihaya Adachi

    ASI2021  2021年12月 

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    開催年月日: 2021年12月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:オンライン   国名:日本国  

  • Recent progress on blue hyperfluorescence OLEDs 招待 国際会議

    Chihaya Adachi

    The 3rd Indian Materials Conclave and 32nd Annual General Meeting of MRSI  2021年12月 

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    開催年月日: 2021年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:インド  

  • Blue hyperfluorescent OLEDs aimed for high efficiency and stability 招待 国際会議

    Chihaya Adachi

    IWPSD2021  2021年12月 

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    開催年月日: 2021年12月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:オンライン   国名:日本国  

  • Accelerating polariton relaxation efficiency by controlling molecular orientation of liquid crystal 国際会議

    @T. Ishii, @F. Bencheikh, @S. Forget, @S. Chénais, @B. Heinrich, @D. Kreher, @L. S. Vargas, @K. Miyata, @K. Onda, @T. Fujihara, @S. Kéna-Cohen, @F. Mathevet, @C. Adachi

    The 6th International TADF Workshop  2021年12月 

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    開催年月日: 2021年12月

    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • Stable blue Hyperfluorescence Organic Light-emitting Diodes 国際会議

    #Chin-Yiu Chan, @Yi-Ting Lee, @Masaki Tanaka, @Yiu-Wing Wong, @Hajime Nakanotani, @Chihaya Adachi

    The 28th International Display Workshops (IDW ’21)  2021年12月 

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    開催年月日: 2021年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Enhanced light-matter interaction and polariton relaxation by the control of molecular orientation

    #石井智大, @Fatima Bencheikh, @Sébastien Forget, @Sébastien Chénais, @Benoit Heinrich, @David Kreher, @Lydia Sosa Vargas, @宮田潔志, @恩田健, @藤原隆, @Stéphane Kéna-Cohen, @Fabrice Mathevet, @安達千波矢

    2021年度物性研究所短期研究会  2021年12月 

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    開催年月日: 2021年12月

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • Operating mechanism of Hyperfluorescence OLEDs 招待 国際会議

    Chihaya Adachi

    ELECMOL2021  2021年11月 

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    開催年月日: 2021年11月 - 2021年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:フランス共和国  

  • 有機CT相互作用が切り拓く高性能OLEDと学理の深化 招待

    安達 千波矢

    有機EL討論会 15周年記念シンポジウム  2021年11月 

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    開催年月日: 2021年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 高効率・高耐久性青色OLEDを目指した材料・デバイス設計 招待

    安達 千波矢

    第385回蛍光体同学会講演会-創立80周年記念-  2021年11月 

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    開催年月日: 2021年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 有機半導体レーザーの材料・デバイス設計 招待

    安達 千波矢

    光とレーザーの科学技術フェア 2021  2021年11月 

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    開催年月日: 2021年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Expanding Charge Transfer (CT) Functions in Organic Optoelectronics 招待 国際会議

    Chihaya Adachi

    APC2021  2021年11月 

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    開催年月日: 2021年11月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:オンライン   国名:大韓民国  

  • 有機発光デバイスの基礎光物理過程から最前線デバイスまで 招待

    安達 千波矢

    JOEMアカデミー 第8回アカデミー  2021年10月 

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    開催年月日: 2021年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 有機発光デバイスの基礎 招待

    安達 千波矢

    化学技術基礎講座  2019年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:オンライン   国名:日本国  

  • 高効率熱活性化遅延蛍光分子によるOLEDの高性能化 招待

    安達 千波矢

    第80回スピントロニクス専門研究会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Rational Molecular and Device Architecture Design for Hyperfluorescence OLED 招待 国際会議

    Chihaya Adachi

    A-COE 2021  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:オンライン   国名:日本国  

  • Materials and Device Physics of Hyperfluorescence OLEDs 招待 国際会議

    Chihaya Adachi

    ICEL 2021  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Recent progress on hyperfluorescence OLEDs 招待 国際会議

    Chihaya Adachi

    KAST International Symposium  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Materials and Device Physics of Hyperfluorescence OLEDs and Future Prospect 招待 国際会議

    Chihaya Adachi

    SSDM2021  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    国名:日本国  

  • オリゴ-p-フェニレンビニレン誘導体のレーザー特性

    @儘田正史, @中野谷一, @安達千波矢

    第29回有機結晶シンポジウム  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • A laser model involving the effect of TADF upconversion 国際会議

    #Ayano Abe; @Kenichi Goushi; @Ryutaro Komatsu; @Takashi Fujihara; @Masashi Mamada; @Chihaya Adachi

    A-COE 2021  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • Role of a charge-transfer interface in blue TTU-OLEDs

    #Nguyen Ba Thanh,@中野谷 一 , @安達 千波矢

    第82回応用物理学会秋季学術講演会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Study and control of recombination zone in organic semiconductor laser diode

    #Sahar Alasvand Yazdani, @Fatima Bencheikh, @Chihaya Adachi

    第82回応用物理学会秋季学術講演会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Role of a charge-transfer interface in blue TTU-OLEDs 国際会議

    #Thanh Ba Nguyen, @Hajime Nakanotani, @Chihaya Adachi

    A-COE 2021  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Quasi-planar TADF molecular design towards pure violet-blue electroluminescence and organic laser 国際会議

    #Xun Tang; @Aziz Khan; @Zuo-Quan Jiang; @Chihaya Adachi

    A-COE 2021  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • 電流励起型ペロブスカイト半導体レーザーの実現に向けた基礎検討

    #奈須 龍太郎, @松島 敏則, @安達千波矢

    第82回応用物理学会秋季学術講演会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 三重項励起子の蓄積とTADF過程が与える影響に関するシミュレーション

    #安部彩乃, @合志憲一, @小松龍太郎, @藤原隆, @儘田正史, @安達千波矢

    第82回応用物理学会秋季学術講演会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 高速ポラリトン緩和による低閾値なポラリトンBose-Einstein 凝縮状態の実現

    #石井智大, @宮田潔志, @儘田正史, @Fatima Bencheikh, @Fabrice Mathevet, @恩田健, @Stéphane Kéna-Cohen, @安達千波矢

    第15回 分子科学討論会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • BSB-Cz 誘導体を含んだ光共振器中におけるポラリトンBose-Einstein 凝縮転移のダイナミクスの解明

    #石井智大,@宮田潔志, @儘田正史, @F. Bencheikh, @F. Mathevet, @恩田健, @S. Kéna-Cohen, @安達千波矢

    第82回応用物理学会秋季学術講演会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • BSB-Cz 誘導体を含んだ光共振器中におけるポラリトンBose-Einstein凝縮状態の観測

    #石井智大,@宮田潔志, @儘田正史, @F. Bencheikh, @F. Mathevet, @恩田健, @Kéna-Cohen, @安達千波矢

    第82回応用物理学会秋季学術講演会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 真空蒸着法による鉛フリーペロブスカイト太陽電池の作製

    #竹熊 廣太郎, @松島 敏則,@安達 千波矢

    第82回応用物理学会秋季学術講演会  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Development of highly emissive laser dyes for organic semiconductor laser diodes 招待 国際会議

    @Masashi Mamada; @Chihaya Adachi

    A-COE 2021  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Investigating HOMO Energy Levels of Terminal Emitters for Realizing HighBrightness and Stable TADF-Assisted Fluorescence Organic Light-Emitting Diodes 国際会議

    @Yi-Ting Lee, @Chin-Yiu Chan, @Masaki Tanaka, @Masashi Mamada, @Umamahesh Balijapalli, @Youichi Tsuchiya, @Hajime Nakanotani, @Takuji Hatakeyama, @Chihaya Adachi

    A-COE 2021  2021年9月 

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    開催年月日: 2021年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 有機材料を用いた輝尽発光システムの開発

    #櫻井 学, @嘉部 量太, @婦木 正明, @LIN Zesen, @陣内 和哉, @小堀 康博, @安達 千波矢, @立川 貴士

    2021年光化学討論会  2021年9月 

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    開催年月日: 2021年9月 - 2021年8月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • OLED用発光材料の基礎から最先端まで 招待

    安達 千波矢

    SID日本支部サマーセミナー  2021年8月 

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    開催年月日: 2021年8月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:オンライン   国名:日本国  

  • Recent progress of hyperfluorescence OLEDs 招待 国際会議

    Chihaya Adachi

    KJF-ICOMEP 2021  2021年8月 

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    開催年月日: 2021年8月

    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:オンライン   国名:日本国  

  • Unintentional passivation of 4-tertbutyl pyridine for improved efficiency and decreased operational stability of perovskite solar cells 国際会議

    @Ganbaatar Tumen-Ulzii; @Toshinori Matsushima; @Chihaya Adachi

    2021 KJF International Conference on Organic Materials for Electronics and Photonics  2021年8月 

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    開催年月日: 2021年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 三重項励起子の生成過程と TADF 過程が連続レーザー発振特性に与える影響についてのシミュレーション

    #安部彩乃; @合志憲一; @小松龍太郎; @藤原隆; @儘田正史; @安達千波矢

    第16回有機デバイス・物性院生研究会  2021年8月 

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    開催年月日: 2021年8月

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • Stable blue Hyperfluorescence Organic Light-emitting Diodes 国際会議

    @Chin-Yiu Chan; @Masaki Tanaka; @Yi-Ting Lee; @Hajime Nakanotani; @Chihaya Adachi

    SPIE Optics + Photonics 2021  2021年8月 

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    開催年月日: 2021年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Stable Pure-blue Hyperfluorescence Organic Light-emitting Diodes with High-efficiency and Narrow Emission 招待 国際会議

    Chihaya Adachi

    ICOCN2021  2021年8月 

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    開催年月日: 2021年7月 - 2021年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:中華人民共和国  

  • 三準位モデルにおける熱活性化遅延蛍光材料の正確な速度論解析

    @土屋 陽一; @安達 千波矢

    有機EL討論会 第32回例会  2021年7月 

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    開催年月日: 2021年7月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Investigating HOMO Energy Levels of Terminal Emitters for Realizing Stable TADF-Assisted Fluorescence Organic Light-Emitting Diodes

    @Yi-Ting Lee; @Chin-Yiu Chan; @Masaki Tanaka; @Youichi Tsuchiya; @Hajime Nakanotani; @Chihaya Adachi

    有機EL討論会 第32回例会  2021年7月 

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    開催年月日: 2021年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Stable blue Hyperfluorescence Organic Light-emitting Diodes with High-efficiency and Narrow Emission 招待 国際会議

    Chihaya Adachi

    中国西湖大学  2021年6月 

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    開催年月日: 2021年6月

    記述言語:英語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:オンライン   国名:中華人民共和国  

  • 熱活性化遅延蛍光・長寿命蓄光現象を用いたデバイスと過渡分光解析 招待

    安達 千波矢

    光化学協会  2021年5月 

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    開催年月日: 2021年5月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:オンライン   国名:日本国  

  • Precise control of charge-transfer states in OLEDs-understanding of device physics and creation of advanced OLED materials- 招待 国際会議

    Chihaya Adachi

    SID2021 Display Week  2021年5月 

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    開催年月日: 2021年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:アメリカ合衆国  

  • 有機ELデバイスの最新展開と発光デバイスの新展開 招待

    安達 千波矢

    サイエンス&テクノロジー  2021年5月 

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    開催年月日: 2021年5月

    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:オンライン   国名:日本国  

  • Stable Pure-blue Hyperfluorescence Organic Light-emitting Diodes with High-efficiency and Narrow Emission 招待 国際会議

    Chihaya Adachi

    PANIC 2021 conference  2021年5月 

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    開催年月日: 2021年5月

    記述言語:英語  

    開催地:オンライン   国名:ポルトガル共和国  

  • High-performance blue OLED elaborated by sophisticated molecular excitonic system 招待 国際会議

    Chihaya Adachi

    SJAN(Sweden-Japan Academic Network Seminar)  2021年3月 

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    開催年月日: 2021年3月

    記述言語:英語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    国名:日本国  

  • 有機Donor: Acceptor混合薄膜中における自発的励起子解離現象

    #上田 雄飛; @中野谷 一; @細貝 拓也; @田中 有弥; @濵田 北斗; @石井 久夫; @山頭 周平; @安達 千波矢

    第68回応用物理学会春季学術講演会  2021年3月 

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    開催年月日: 2021年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Triplet recycling for quasi-continuous-wave organic semiconductor lasers

    #A.M.Chathuranganie Senevirathne; @Seiya Yoshida; @Morgan Auffray; @Buddhika S. B. Karunathilaka; @Kenichi Goushi; @Atula S. D. Sandanayake; @Toshinori Matsushima; @Chihaya Adachi

    第68回応用物理学会春季学術講演会  2021年3月 

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    開催年月日: 2021年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 有機・無機ハイブリッドペロブスカイト材料のLED・レーザー素子への展開 招待

    @安達 千波矢; @松島 敏則

    第169回ラドテック研究会講演会  2021年1月 

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    開催年月日: 2021年1月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 有機半導体レーザーの材料・デバイス設計 招待 国際会議

    Chihaya Adachi

    The 41st Annual Meeting of The Laser Society of Japan  2021年1月 

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    開催年月日: 2021年1月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Recent Progress on Blue TADF OLEDs 国際会議

    Chihaya Adachi

    5th International TADF Workshop  2020年12月 

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    開催年月日: 2020年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 高効率かつ優れた耐久性を示す青色有機EL素子

    #田中 正樹; @Chin-Yiu Chan; @中野谷 一; @畠山 琢次; @安達 千波矢

    有機EL討論会第31回例会  2020年12月 

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    開催年月日: 2020年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 有機ドナー・アクセプター混合薄膜中の自発配向分極による励起子束縛への影響

    #上田 雄飛; @中野谷 一; @細貝 拓也; @田中 有弥; @浜田 北斗; @石井 久夫; @山頭 周平; @安達 千波矢

    第15回有機デバイス・物性院生研究会  2020年12月 

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    開催年月日: 2020年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 三重項励起子制御によるASE耐久性の向上

    #安部 彩乃; @小松 龍太郎; @藤原 隆; @合志 憲一; @儘田 正史; @安達 千波矢

    第15回有機デバイス・物性院生研究会  2020年12月 

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    開催年月日: 2020年12月

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • 高効率近赤外有機EL素子の開発

    #山田 錦; @Umamahesh Balijapalli; #永田 亮; @中野谷 一; @田中 正樹; @儘田 正史; @安達 千波矢

    第15回有機デバイス・物性院生研究会  2020年12月 

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    開催年月日: 2020年12月

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • 高効率近赤外TADF分子の開発と脈波センシングへの応用

    #永田 亮; @Umamahesh Balijapalli; @山田 錦; @中野谷 一; @田中 正樹; @儘田 正史; @𡈽屋 陽一; @服部 励治; @安達 千波矢

    有機EL討論会第31回例会  2020年12月 

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    開催年月日: 2020年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 精密分子設計が切り拓く有機系発光分子の新展開 招待

    安達 千波矢

    第29回ポリマー材料フォーラム  2020年11月 

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    開催年月日: 2020年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 精密分子設計が切り拓く究極の有機 EL デバイス 招待

    安達 千波矢

    第 22 回高柳健次郎記念シンポジウム  2020年11月 

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    開催年月日: 2020年11月

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • 有機発光デバイスの基礎光物理過程から最前線デバイスまで 招待

    安達 千波矢

    JOEMアカデミー 第7回アカデミー  2020年11月 

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    開催年月日: 2020年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Quasi-Continuous-Wave Laser Operation of Organic Lasers with a Mixed-Order Circular Distributed Feedback Structure 国際会議

    @Chathuranganie A.M. @Senevirathne; @Atula S. D. Sandanayaka; @Buddhika S. B. Karunathilaka; @Chuanjiang Qin; @Kenichi Goushi; @Toshinori Matsushima; @Chihaya Adachi

    The 12th Asian Conference on Organic Electronics (A-COE 2020)  2020年11月 

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    開催年月日: 2020年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Trapped charge carriers accelerated Auger recombination in quasi-two-dimensional metal halide perovskite light-emitting diodes 国際会議

    #Satoru Watanabe; @Toshinori Matsushima; @Chihaya Adachi

    The 12th Asian Conference on Organic Electronics (A-COE 2020)  2020年11月 

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    開催年月日: 2020年11月

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • Design and synthesis of robust organic laser materials toward organic laser devices 国際会議

    #Yuya Oyama; @Masashi Mamada; @Chihaya Adachi

    The 12th Asian Conference on Organic Electronics (A-COE 2020)  2020年11月 

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    開催年月日: 2020年11月

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • OLEDから有機半導体レーザーへの新展開ー先進分子設計とデバイス設計ー 招待

    安達 千波矢

    第10回CSJ化学フェスタ2020  2020年10月 

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    開催年月日: 2020年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Thermally Stable Perovskite Solar Cells with Chemically Doped Spiro-OMeTAD Hole Transport Layer 国際会議

    @Ganbaatar Tumen-Ulzii; @Toshinori Matsushima; @Chihaya Adachi

    NanoGe Fall Meeting 2020  2020年10月 

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    開催年月日: 2020年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Study on the Role of TADF-Type Molecules for Exciplex-Based OLEDs 国際会議

    #Thanh Ba Nguyen; @Hajime Nakanotani; @Takuji Hatakeyama; @Chihaya Adachi

    The 12th Asian Conference on Organic Electronics (A-COE 2020)  2020年11月 

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    開催年月日: 2020年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Exciton management in OLED and organic semiconductor lasers 招待 国際会議

    Chihaya Adachi

    6th International Fall School on Organic Electronics (IFSOE-2020)  2021年9月 

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    開催年月日: 2020年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:その他  

  • 有機半導体レーザーダイオードの電流励起発振の兆候 招待

    @A. S. D. Sandanayaka, @松島 敏則, @F. Bencheikh, @寺川 しのぶ, @W J. Potscavage, Jr., @C. Qin, @藤原 隆, @合志 憲一, @J-C Ribierre, @安達 千波矢

    第81回応用物理学会秋季学術講演会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:オンライン   国名:日本国  

  • 有機CT状態の精密制御が切り拓く高性能有機発光デバイス 招待

    安達 千波矢

    2020年web光化学討論会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:オンライン   国名:日本国  

  • 低レーザー閾値を有する近赤外有機レーザー材料の開発

    #青木 怜子; @小松 龍太郎; @Anthony D'Aleo; @儘田 正史; @安達 千波矢

    第81回応用物理学会秋季講演会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Two-dimensional distributed feedback structures for quasi continuous wave lasing from organic semiconductors

    #A.M.Chathuranganie Senevirathne; @Atula S. D. Sandanayake; @Buddhika S. B. Karunathilaka; @Chuanjian Qin; @Kenichi Goushi; @Toshinori Matsushima; @Chihaya Adachi

    第81回応用物理学会秋季学術講演会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Solution Processable Fluorene-Based Laser Dye for Organic Solid-State Lasers 国際会議

    #Chathuranganie A. M. Senevirathne; @Van T. N. Mai; @Atul Shukla; @Shih-Chun Lo; @Ebinazar B. Namdas; @Toshinori Matsushima; @Atula S. D. Sandanayaka; @Chihaya Adachi,

    2020 International conference on solid state devices and materials  2020年9月 

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    開催年月日: 2020年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 有機レーザー色素の長波長化と耐久性向上を可能とする分子構造の探索

    #大山 裕也; @儘田 正史; @近藤 晃弘; @安達 千波矢

    第81回応用物理学会秋季学術講演会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 固体薄膜中における有機発光分子の自発的な励起子解離現象

    #山中 孝彦; @中野谷 一; @安達 千波矢

    2020年web光化学討論会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 金属ハライドペロブスカイトLEDにおける効率ロールオフの解析

    #渡辺 慧; @松島 敏則; @安達 千波矢

    第81回応用物理学会秋季学術講演会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 分子配向性制御によるポラリトン緩和速度の高速化

    #石井 智大; @Lydia Sosa Vargas; @F. Mathevet; @F. Bencheikh; @宮田 潔志; @恩田 健; @安達 千波矢

    第81回応用物理学会秋季学術講演会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 分子内電荷移動CT性の変化によるポラリトン緩和ダイナミクスの制御

    #石井 智大; @儘田 正史; @F. Bencheikh; @宮田 潔志; @恩田 健; @安達 千波矢

    第81回応用物理学会秋季学術講演会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Recent Progress in Advanced Blue TADF OLEDs 招待 国際会議

    Chihaya Adachi

    IMID2020  2020年8月 

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    開催年月日: 2020年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:その他  

  • F8BT-based Light-Emitting Molecules for Organic Solid-State Lasers 国際会議

    @Masashi Mamada; @Ryutaro Komatsu; @Chihaya Adachi

    ICSM (the International Conference on Science and Technology of Synthetic Metals) 2020  2020年7月 

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    開催年月日: 2020年7月

    記述言語:英語   会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:オンライン   国名:日本国  

  • Lighting up the future: new technologies for smart devices. 国際会議

    @Fatima Bencheikh; @Chihaya Adachi

    First algerian scientific home camp 2020  2020年5月 

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    開催年月日: 2020年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Organic semiconductor distributed feedback (DFB) lasers 招待 国際会議

    Atula S. D. Sandanayaka, Toshinori Matsushima, Chihaya Adachi

    Cyril Ponnamperuma Memorial International Conference on Multidisciplinary Research  2020年1月 

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    開催年月日: 2020年1月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:キャンディ  

  • 有機分子と金属ハライドペロブスカイトを 融合させた新コンセプト発光デバイスの創製 招待

    松島敏則、安達千波矢

    第15回 有機光エレクトロニクス産業化研究会  2020年1月 

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    開催年月日: 2020年1月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福岡県福岡市   国名:日本国  

  • Indication of Current Injection Organic Semiconductor Laser Diodes 招待 国際会議

    C. Adachi

    International Conference on Emergent Functional Matter Science 2019  2019年12月 

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    開催年月日: 2019年12月

    会議種別:口頭発表(一般)  

    開催地:新竹   国名:台湾  

  • High Efficiency and Stability from Thick Organic Light-Emitting Diodes with Metal Halide Perovskite Transport Layers 招待

    Toshinori Matsushima, Fatima Bencheikh, Takeshi Komino, Matthew R. Leyden, Atula S. D. Sandanayaka, Chuanjiang Qin

    IPOMY, The Second International Conference of Polymeric and Organic Materials in Yamagata University  2019年12月 

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    開催年月日: 2019年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:山形県米沢市   国名:日本国  

  • Indication of Current Injection Organic Semiconductor Laser Diodes 招待

    C. Adachi

    RIKEN CEMSupra  2019年12月 

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    開催年月日: 2019年12月

    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • OLEDを中心とした有機発光デバイスの基礎から最先端デバイスまで 招待

    C. Adachi

    情報機構 有機ELセミナー  2019年12月 

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    開催年月日: 2019年12月

    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 実用化が期待されるTADF-OLEDの高性能化と広がるOLEDの新展開 招待

    C. Adachi

    第29回 ファインテック ジャパン  2019年12月 

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    開催年月日: 2019年12月

    会議種別:口頭発表(一般)  

    開催地:幕張   国名:日本国  

  • Challenge for next generation organic optoelectronics with finely designed organic molecules 招待

    C. Adachi

    電子科学研究所国際シンポジウム  2019年12月 

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    開催年月日: 2019年12月

    会議種別:口頭発表(一般)  

    開催地:千歳   国名:日本国  

  • 有機ELの高性能化 招待

    C. Adachi

    2019有機エレクトロニクス講習会  2019年11月 

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    開催年月日: 2019年11月

    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • ベンゾフラン骨格を含有する高耐久有機半導体レーザー材料の設計と合成

    大山裕也、儘田正史、安達千波矢

    有機EL討論会 第29回例会  2019年11月 

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    開催年月日: 2019年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:愛知県岡崎市   国名:日本国  

  • 金属ハライドペロブスカイトによる新型LEDの開発とその研究動向 招待

    Toshinori Matsushima,  Chuanjian Qin, Chihaya Adachi

    日本学術振興会先端ナノデバイス・材料テクノロジー第151委員会研究会  2019年11月 

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    開催年月日: 2019年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都   国名:日本国  

  • Fine control of charge transfer interaction in organic materials and their high-performance optoelectronic devices 招待 国際会議

    Chihaya Adachi, Hajime Nakanotani, Ryota Kabe

    International Conference on Electronic Materials Leading the Future2019(ICE-MLF 2019)  2019年11月 

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    開催年月日: 2019年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:ソウル   国名:大韓民国  

  • OLEDから有機半導体レーザーへの新展開 招待

    C. Adachi

    第35回(2019)京都賞記念ワークショップ  2019年11月 

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    開催年月日: 2019年11月

    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • OLEDから有機半導体レーザーへの新展開 招待

    C. Adachi

    京都賞記念講演  2019年11月 

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    開催年月日: 2019年11月

    会議種別:口頭発表(一般)  

    開催地:京都   国名:日本国  

  • Advanced molecular design for high performance organic light emitting devices 招待 国際会議

    C. Adachi

    The 11th Asian Conference on Organic Electronics (A-COE)  2019年11月 

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    開催年月日: 2019年11月

    会議種別:口頭発表(一般)  

    開催地:新北   国名:台湾  

  • Challenge for next generation organic optoelectronics with finely designed organic molecules 招待

    C. Adachi

    Tamkang University special lecture  2019年11月 

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    開催年月日: 2019年11月

    会議種別:口頭発表(一般)  

    開催地:新北   国名:台湾  

  • Efficient and Stable Metal Halide Hybrid Perovskite Solar Cells 招待 国際会議

    Toshinori Matsushima,  Chuanjian Qin, Chihaya Adachi

    236th ECS Meeting  2019年10月 

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    開催年月日: 2019年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:アトランタ  

  • A CURRENT-INJECTION ORGANIC SEMICONDUCTOR LASER DIODE 招待

    T. Matsushima, A. S.D. Sandanayaka, F. Bencheikh, S. Terakawa, W. J. Potscavage Jr., C. Qin,T. Fujihara, K. Goushi, J-C. Ribierre, C. Adachi

    The 19th International Discussion & Conference on Nano Interface Controlled Electronic Devices (IDC-NICE 2019)  2019年10月 

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    開催年月日: 2019年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:北海道札幌市   国名:日本国  

  • 新規アセノアセン誘導体の物性と半導体特性

    儘田正史、Jousselin-Oba Tanguy、Jérôme Marrot、Antoine Maignan、安達千波矢、Abderrahim Yassar

    第30回基礎有機化学討論会  2019年9月 

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    開催年月日: 2019年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪府大阪市   国名:日本国  

  • 有機分子と金属ハライドペロブスカイトを融合させた次世代発光デバイス 招待

    Toshinori Matsushima, Fatima Bencheikh, Takeshi Komino, Matthew Lyden, Atula S.D. Sandanayaka, Chuanjian Qin, Chihaya Adachi

    第68回高分子討論会  2019年9月 

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    開催年月日: 2019年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福井県福井市   国名:日本国  

  • 金属ハライドペロブスカイトLEDの劣化機構の解明

    渡辺慧、松島敏則、安達千波矢

    第80回応用物理学会秋季学術講演会  2019年9月 

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    開催年月日: 2019年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:北海道札幌市   国名:日本国  

  • メタルハライドペロブスカイト輸送層を用いた厚膜有機EL素子

    Toshinori Matsushima, Fatima Bencheikh, Takeshi Komino, Matthew Lyden, Atula S.D. Sandanayaka, Chuanjian Qin, Chihaya Adachi

    第80回応用物理学会秋季学術講演会  2019年9月 

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    開催年月日: 2019年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:北海道札幌市   国名:日本国  

  • Continuous Wave Operation Based on Solution-Processable Organic Thin Film Lasers

    C. A. M. Senevirathne, A. S. D. Sandanayaka, C. Adachi

    第80回応用物理学会秋季学術講演会  2019年9月 

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    開催年月日: 2019年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:北海道札幌市   国名:日本国  

  • A current-injection organic semiconductor laser diode

    Atula S.D. Sandanayaka, Chihaya Adachi

    第80回応用物理学会秋季学術講演会  2019年9月 

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    開催年月日: 2019年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:北海道札幌市   国名:日本国  

  • Enhancement of organic long-persistent luminescence by optimizing donor and introducing extra dopants

    陣内和哉、西村尚大、嘉部量太、安達千波矢

    2019年光化学討論会  2019年9月 

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    開催年月日: 2019年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:愛知県名古屋市   国名:日本国  

  • Enhanced Electroluminescence from Organic Light-Emitting Diodes with an Or-ganic-Inorganic Perovskite Host Layer

    Toshinori Matsushima, Kenichi Goushi, Fatima Bencheikh, Takeshi Komino, Matthew Lyden, Atula S.D. Sandanayaka, Chihaya Adachi

    2019 International Conference on Solid State Devices and Materials  2019年9月 

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    開催年月日: 2019年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:愛知県名古屋市   国名:日本国  

  • Organic charge-transfer states with versatility functions in optoelectronic devices 招待 国際会議

    Chihaya Adachi

    XXIVth International Krutyn Summer School 2019  2019年9月 

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    開催年月日: 2019年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:クルティン   国名:ポーランド共和国  

  • Indication of current-injection lasing from an organic semiconductor 招待 国際会議

    C. Adachi

    15th European Conference on Molecular Electronics (ECME)  2019年8月 

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    開催年月日: 2019年8月

    会議種別:口頭発表(一般)  

    開催地:Linkoping   国名:スウェーデン王国  

  • High-performance organic light-emitting diodes with metal halide perovskite host and transport layers 招待 国際会議

    Toshinori Matsushima, Fatima Bencheikh, Takeshi Komino, Matthew Lyden, Atula S.D. Sandanayaka, Chuanjian Qin, Chihaya Adachi

    2019 KJF International Conference on Organic Materials for Electronics and Photonics (KJF-ICOMEP 2019)  2019年8月 

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    開催年月日: 2019年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:済州   国名:大韓民国  

  • Organic CT Technologies Expanding the Possibility of Organic Light-Emitting Devices 招待 国際会議

    C. Adachi

    The 4th International TADF Workshop  2019年8月 

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    開催年月日: 2019年8月

    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • High-performance organic light-emitting diodes with metal halide hybrid perovskites 招待 国際会議

    Toshinori Matsushima, Chihaya Adachi

    The International society for optics and photonics (SPIE)  2019年8月 

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    開催年月日: 2019年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:San Diego  

  • O rganic s emiconductor l aser s under optical and electrical excitation 招待 国際会議

    C. Adachi

    SPIE2019  2019年8月 

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    開催年月日: 2019年8月

    会議種別:口頭発表(一般)  

    開催地:San Diego  

  • 高効率近赤外有機EL素子の設計指針

    永田亮、中野谷一、 William J. Potscavage Jr., 安達千波矢

    第14回 有機デバイス・物性院生研究会  2019年7月 

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    開催年月日: 2019年7月 - 2019年8月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都文京区   国名:日本国  

  • スピン変換過程を伴う高効率Triplet-triplet upconversion機構

    家宇治亮太、合志憲一、安達千波矢

    第14回 有機デバイス・物性院生研究会  2019年7月 

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    開催年月日: 2019年7月 - 2019年8月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都文京区   国名:日本国  

  • TADF-OLED and beyond 招待 国際会議

    C. Adachi

    ISNA2018  2019年7月 

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    開催年月日: 2019年7月

    会議種別:口頭発表(一般)  

    開催地:札幌   国名:日本国  

  • Current Injection Organic Semiconductor Laser Diodes 招待

    C. Adachi

    WISE 2019, Westlake International Symposium in Engineering  2019年7月 

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    開催年月日: 2019年7月

    会議種別:口頭発表(一般)  

    開催地:Hangzhou   国名:中華人民共和国  

  • ORGANIC SEMICONDUCTOR LASERS UNDER OPTICAL AND ELECTRICAL EXCITATION 招待 国際会議

    C. Adachi

    13th International Conference on Optical Probes of Organic and Hybrid Optoelectronic Materials and Applications 2019  2019年7月 

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    開催年月日: 2019年7月

    会議種別:口頭発表(一般)  

    開催地:Vilnius   国名:その他  

  • HIGH PERFORMANCE ORGANIC LIGHT-EMITTING DEVICES FROM OLEDS AND ORGANIC SEMICONDUCTOR LASERS 招待 国際会議

    C. Adachi

    47th IUPAC World Chemistry Congress  2019年7月 

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    開催年月日: 2019年7月 - 2019年5月

    会議種別:口頭発表(一般)  

    開催地:Paris   国名:フランス共和国  

  • Photostable and highly emissive organic nanoparticles exhibiting long lifetime emission 国際会議

    Yoichi Tsuchiya, Chihaya Adachi

    Malmo 21-IVC  2019年7月 

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    開催年月日: 2019年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Malmo   国名:スウェーデン王国  

  • Advanced molecular design from OLED to organic semiconductor lasers 招待 国際会議

    C. Adachi

    21st International Vacuum Congress  2019年7月 

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    開催年月日: 2019年7月

    会議種別:口頭発表(一般)  

    開催地:Malmo   国名:スウェーデン王国  

  • TADF-OLEDの劣化過程における発光スペクトル変化とキャリアバランスの関係

    田中 正樹、野田 大貴、中野谷 一、安達 千波矢

    有機EL 討論会 第26回例会  2019年6月 

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    開催年月日: 2019年6月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都江東区(日本科学未来館)   国名:日本国  

  • 有機無機ペロブスカイトをホスト材料として用いた有機EL

    松島敏則, Fatima Bencheikh, Matthew Leyden, Atula S. D. Sandanayaka, Chuanjiang Qin, 合志憲一

    有機EL 討論会 第26回例会  2019年6月 

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    開催年月日: 2019年6月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都江東区(日本科学未来館)   国名:日本国  

  • 熱活性化遅延蛍光有機ELにおける外部磁場印加効果

    田中正樹、永田亮、中野谷一、安達千波矢

    有機EL討論会第28回例会  2019年6月 

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    開催年月日: 2019年6月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都江東区   国名:日本国  

  • スピン変換を伴う高効率TTU機構

    家宇治亮太、合志憲一、安達千波矢

    有機EL討論会第28回例会  2019年6月 

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    開催年月日: 2019年6月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都江東区   国名:日本国  

  • 一重項励起子開裂過程を利用した近赤外有機EL素子

    永田亮、中野谷一、 William J. Potscavage Jr., 安達千波矢

    有機EL討論会第28回例会  2019年6月 

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    開催年月日: 2019年6月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都江東区   国名:日本国  

  • Optical and electrical excitation of organic semiconductor laser diodes 招待 国際会議

    Chihaya Adachi

    Fpi-14  2019年6月 

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    開催年月日: 2019年6月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:ベルリン   国名:ドイツ連邦共和国  

  • Organic charge-transfer states blooming unique organic optoelectronic devices 招待 国際会議

    Chihaya Adachi

    2019 National Taiwan Normal University (NTNU)-Kyushu University Joint Forum on Facilitating Interdisciplinary Research and Education  2019年5月 

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    開催年月日: 2019年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:台北   国名:台湾  

  • Operational Degradation Mechanism of Perovskite Solar Cells 国際会議

    Chuanjian Qin, Toshinori Matsushima, Chihaya Adachi

    The 6th Conference on Science and Technology of Emerging Solar Energy Materials  2019年5月 

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    開催年月日: 2019年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:北京   国名:中華人民共和国  

  • Organic photonics and electronics - present progress and the future- 招待 国際会議

    Chihaya Adachi

    SID Display week 2019  2019年5月 

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    開催年月日: 2019年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:サンノゼ  

  • TADF-OLED -exciton mechanism, EL efficiency and device lifetime- 招待 国際会議

    Chihaya Adachi

    ASIA CHEM  2019年4月 

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    開催年月日: 2019年4月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:寧波   国名:中華人民共和国  

  • テトラセン骨格を基にした一重項ビラジカル化合物の合成と物性

    中村 亮太、儘田 正史、安達 千波矢

    日本化学会 第99回春季年会  2019年3月 

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    開催年月日: 2019年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:兵庫県神戸市(甲南大学 岡本キャンパス)   国名:日本国  

  • Efficient Exciplex Systems Based on Phenylpyridinato Boron Derivatives via Excited-State Energy Alignment

    Masashi Mamada, Tian Guojian, Su Jianhua, Hajime Nakanotani, Chihaya Adachi

    日本化学会 第99回春季年会  2019年3月 

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    開催年月日: 2019年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:兵庫県神戸市(甲南大学 岡本キャンパス)   国名:日本国  

  • 三重項失活剤の導入による有機薄膜の励起状態安定性の向上三重項失活剤の導入による有機薄膜の励起状態安定性の向上

    松島敏則,吉田誠矢,稲田工,江崎有,福永利哉,三重野寛之,中村望,F. Bencheikh,M. R. Leyden,小松龍太郎,C. Qin,A. S. D. Sandanayaka,安達千波矢

    第66回 応用物理学会春季学術講演会  2019年3月 

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    開催年月日: 2019年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都目黒区(東京工業大学)   国名:日本国  

  • Organic semiconductor distributed feedback (DFB) laser

    A. S. D. Sandanayaka, T. Matsushima, F. Bencheikh, S. Terakawa, William J. Potscavage, Jr. , C. Qin, T. Fujihara, K. Goushi, J-C Ribierre and C. Adachi

    第66回 応用物理学会春季学術講演会  2019年3月 

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    開催年月日: 2019年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:東京都目黒区(東京工業大学)   国名:日本国  

  • メタルハライドペロブスカイトから有機発光分子へのエネルギー移動を利用した高効率有機EL 招待

    松島敏則、ファティマ・ベンシェイク、小蓑 剛、マシュー・ライアン・ライデン

    日本学術振興会 情報科学用有機材料142委員会C部会(第86回) 光電相互交換第125委員会(第244回) 合同研究会  2019年3月 

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    開催年月日: 2019年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都千代田区(明治大学)   国名:日本国  

  • Efficient and Stable Metal Halide Perovskite Solar Cells 招待 国際会議

    Chihaya Adachi

    JSPS SF 15th Anniversary Event World Premier Research in Japan 2019  2019年1月 

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    開催年月日: 2019年1月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:米国カリフォルニア州(Standford 大学)   国名:アメリカ合衆国  

  • How the Laser Threshold and the Slope Efficiency of Organic Semiconductor Lasers Are Affected by the Various Loss Processes 国際会議

    Fatima Bencheikh、Chihaya Adachi

    3rd Frontiers of Organic semiconductor lasers  2019年1月 

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    開催年月日: 2019年1月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:ブリスベン   国名:オーストラリア連邦  

  • Long-lived triplet excitons and radical ion pairs in organic semiconducting host–guest systems

    Ryota Kabe, Chihaya Adachi

    2018 MRS Fall Meeting and Exhibit  2018年11月 

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    開催年月日: 2018年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:米国マサチューセッツ州(Hynes Convention Center and Sheraton Boston Hotel)   国名:アメリカ合衆国  

  • Wide-range tuning and enhancement of organic long persistent luminescence

    Kazuya Jinnai, Ryota Kabe, Chihaya Adachi

    2018 MRS Fall Meeting and Exhibit  2018年11月 

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    開催年月日: 2018年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:米国マサチューセッツ州(Hynes Convention Center and Sheraton Boston Hotel)   国名:アメリカ合衆国  

  • 有機薄膜における電場による励起子解離過程

    福永 利哉、松島 敏則、江崎 有、永田 亮、安達千波矢

    有機EL 討論会 第27回例会  2018年11月 

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    開催年月日: 2018年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:兵庫県姫路市   国名:日本国  

  • Electrically generated exciton management in OLEDs and organic laser diodes 招待 国際会議

    Chihaya Adachi

    MOC 2018  2018年10月 

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    開催年月日: 2018年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:台湾・台北(International Convention Center)   国名:台湾  

  • Organic afterglow emission from long-lived excitons 招待 国際会議

    Ryota Kabe, Chihaya Adachi

    Regensburg University Seminar  2018年10月 

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    開催年月日: 2018年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:ドイツ・レーゲンスブルグ(Regensburg University)   国名:ドイツ連邦共和国  

  • Efficient and Stable quasi-2D Perovskite Light-Emitting Diodes 国際会議

    Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi

    PSVO-2018  2018年10月 

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    開催年月日: 2018年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:スイス・ローザンヌ   国名:スイス連邦  

  • TADF-OLEDの劣化過程における発光スペクトル変化と輝度劣化機構

    田中正樹、野田大貴、中野谷一、安達千波矢

    第79回応用物理学会秋季学術講演会  2018年9月 

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    開催年月日: 2018年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:愛知県名古屋市(名古屋国際会議場)   国名:日本国  

  • CT性を有するアントラセン誘導体におけるTriplet-triplet upconversion特性

    家宇治亮太、合志憲一、安達千波矢

    第79回応用物理学会秋季学術講演会  2018年9月 

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    開催年月日: 2018年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:愛知県名古屋市(名古屋国際会議場)   国名:日本国  

  • トリアジン系材料を用いた高耐久性TADF-OLEDの開発と劣化機構の解明 招待

    山口 健太、松島 敏則、安達 千波矢

    第79回応用物理学会秋季学術講演会  2018年9月 

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    開催年月日: 2018年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:愛知県名古屋市(名古屋国際会議場)   国名:日本国  

  • 金属ハライドペロブスカイトの光・電子デバイス応用 招待

    松島 敏則、安達 千波矢

    第79回応用物理学会秋季学術講演会  2018年9月 

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    開催年月日: 2018年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:愛知県名古屋市(名古屋国際会議場)   国名:日本国  

  • Enhancement of Electrical Properties and Air Stability in High-Density Organic Amorphous Films 国際会議

    Yu Esaki, Takeshi Komino, Toshinori Matsushima, Chihaya Adachi

    EL2018  2018年9月 

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    開催年月日: 2018年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:東京都千代田区(明治大学)   国名:日本国  

  • Enhanced Electrical Properties and Air Stability in High-Density Amorphous Organic Films 国際会議

    Yu Esaki, Takeshi Komino, Toshinori Matsushima, Chihaya Adachi

    2018 International Conference on Solid State Devices and Materials (SSDM2018)  2018年9月 

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    開催年月日: 2018年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:東京都千文京区(東京大学)   国名:日本国  

  • Modeling of organic semiconductor LASERs: toward continuous wave operation and electrical current injection 招待 国際会議

    F. Bencheikh, A. S. D. Sandanayaka,T. Fukunaga,T. Matsushima, C. Adachi,

    International Conference on Simulation of Organic Electronics and Photovoltaics, SimOEP 2018  2018年9月 

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    開催年月日: 2018年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:スイス・ヴィンタートゥール(Zurich University of Applied Sciences)   国名:スイス連邦  

  • Organic light emitting devices -fundamentals and cutting edge high performance devices- 招待 国際会議

    Chihaya Adachi

    IEEE Flexible Electronics Conference  2018年8月 

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    開催年月日: 2018年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:カナダ・オタワ(Delta Hotels by Marriott Ottawa City Centre)   国名:カナダ  

  • Control of Molecular Orientation in Guest Emitters used for Organic Light-Emitting Diodes 国際会議

    小蓑 剛、安達 千波矢

    43rd International Conference on Coordination Chemistry  2018年7月 

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    開催年月日: 2018年7月 - 2018年8月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:宮城県仙台市(仙台国際センター)   国名:日本国  

  • Efficient Quasi-2D Perovskite Light-Emitting Diodes 招待 国際会議

    Chuanjiang Qin、Toshinori Matsushima、Chihaya Adachi

    IPS-22  2018年7月 

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    開催年月日: 2018年7月 - 2019年8月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:Hafei   国名:中華人民共和国  

  • Singlet fission sensitized organic light emitting diode 国際会議

    Ryo Nagata, Hajime Nakanotani, William J. Potscavage Jr., Chihaya Adachi

    3rd International TADF Workshop  2018年7月 

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    開催年月日: 2018年7月 - 2018年6月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:福岡県福岡市東区(ホテル・ルイガンズ)   国名:日本国  

  • 電荷分離を利用した有機蓄光システム 招待

    嘉部 量太、安達 千波矢

    情報科学用有機材料第142委員会合同研究会  2018年7月 

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    開催年月日: 2018年7月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Deep-red Amplified Spontaneous Emission from cis-Configured Squaraine 国際会議

    Hao Ye, Linsong Cui, Toshinori Matsushima, Chuanjiang Qin, Chihaya Adachi,

    The International Conference on Science and Technology of Synthetic Metals 2018 (ICSM 2018)  2018年7月 

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    開催年月日: 2018年6月 - 2018年7月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:Busan Exhibition and Convention Centre (BEXCO)   国名:大韓民国  

  • The analysis of rotationally accessed electronic transition of thermally activated delayed fluorescence molecules 国際会議

    Harunobu Takeda, Takeshi Komino, Hiroaki Yoshioka, Yuji Oki, Chihaya Adachi

    CLEO laser science to photonics applications  2018年5月 

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    開催年月日: 2018年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:San Jose Convention Center   国名:日本国  

  • Perovskite for High Performance Solar Cells and LEDs

    Chihaya Adachi

    2018 MRS Spring Meeting & Exhibit  2018年4月 

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    開催年月日: 2018年4月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:米国 アリゾナ州フェニックス市   国名:アメリカ合衆国  

  • Exciton Management in Organic Light Emitting Devices Aimed for Current Injection Organic Lasers

    Chihaya Adachi

    2018 MRS Spring Meeting & Exhibit  2018年4月 

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    開催年月日: 2018年4月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:米国 アリゾナ州フェニックス市   国名:アメリカ合衆国  

  • Afterglow Organic Light Emitting Diode 国際会議

    Ryota Kabe, Naoto Notsuka, Kou Yoshida, Chihaya Adachi

    MSR spring MTG  2016年3月 

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    開催年月日: 2016年3月

    開催地:Phoenix   国名:アメリカ合衆国  

  • Organic excitonic materials and devices: OLEDs and laser 招待 国際会議

    Chihaya Adachi

    MSR spring MTG  2016年3月 

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    開催年月日: 2016年3月

    開催地:Phoenix   国名:アメリカ合衆国  

  • 高移動度有機無機ペロブスカイトトランジスタ

    松島敏則,S. Hwang,A. S. D. Sandanayaka,C. Qin,藤原隆,安達千波矢

    第63回応用物理学会春季学術講演会  2016年3月 

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    開催年月日: 2016年3月

    開催地:東京   国名:日本国  

  • Mg-Au合金陰極による有機EL素子の大気安定性の向上

    新井 啓矢、中野谷 一、森本 京、安達 千波矢

    第63回応用物理学会春季学術講演会  2016年3月 

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    開催年月日: 2016年3月

    開催地:東京   国名:日本国  

  • Horizontal molecular orientation in solution-processed glassy organic thin films based on oligofluorene derivatives

    L. Zhao, T. Komino, M. Inoue, J.-H. Kim, J.C. Ribierre, C. Adachi

    第63回応用物理学会春季学術講演会  2016年3月 

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    開催年月日: 2016年3月

    開催地:東京   国名:日本国  

  • Quasi-continuous-wave lasing in a solvent-free liquid molecular semiconductor

    J.C. Ribierre, A.S.D. Sandanayaka, J.-H. Kim, D. Pitrat, L. Zhao, T. Matsushima, C. Andraud, C. Adachi

    第63回応用物理学会春季学術講演会  2016年3月 

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    開催年月日: 2016年3月

    開催地:東京   国名:日本国  

  • Quasi Continuous-wave Lasing in Organic Thin-film Distributed Feedback systems

    A. S. D. Sandanayaka, T. Matsushim, C. Adachi

    第63回応用物理学会春季学術講演会  2016年3月 

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    開催年月日: 2016年3月

    開催地:東京   国名:日本国  

  • 有機無機ペロブスカイトを用いた高移動度トランジスタ

    松島敏則,Sunbin Hwang,Atula S. D. Sandanayaka,Chuanjiang Qin,藤原隆,安達千波矢

    電子情報通信学会大会  2016年3月 

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    開催年月日: 2016年3月

    開催地:福岡   国名:日本国  

  • チュート リアル:OLEDの基礎から最先端まで −材料・デバイス・アプリケーション− 招待

    安達 千波矢

    電子情報通信学会大会  2016年3月 

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    開催年月日: 2016年3月

    開催地:福岡   国名:日本国  

  • High performance TADF based OLEDs 招待 国際会議

    Chihaya Adachi

    ISOEL2016  2016年2月 

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    開催年月日: 2016年2月

    開催地:Seoul   国名:大韓民国  

  • Dual emission of both fluorescence and phosphorescence from single-emitter OLED 国際会議

    Ryota Kabe, Naoto Notsuka, Kou Yoshida, Chihaya Adachi

    ISFM2016  2016年1月 

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    開催年月日: 2016年1月

    開催地:沖縄   国名:日本国  

  • Carrier Traps Induced Degradation of Planar Perovskite Solar Cells 国際会議

    Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi

    ISFM2016  2016年1月 

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    開催年月日: 2016年1月

    開催地:沖縄   国名:日本国  

  • Nearly 100% electron-photon conversion by using novel strategy of harvesting triplet excitons in organic light emitting devices 招待 国際会議

    Chihaya Adachi

    ISFM2016  2016年1月 

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    開催年月日: 2016年1月

    開催地:沖縄   国名:日本国  

  • Degradation Mechanism of Planar Perovskite Solar Cells 国際会議

    Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi

    3rd CMS International Symposium  2016年1月 

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    開催年月日: 2016年1月

    開催地:福岡   国名:日本国  

  • 熱活性遅延蛍光分子のテラヘルツ分光特性計測

    竹田晴信,陳 聡,吉岡 宏晃,小蓑剛,興 雄司,安達千波矢

    レーザー学会学術講演会 第36回年次大会  2016年1月 

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    開催年月日: 2016年1月

    開催地:名古屋   国名:日本国  

  • 非晶質薄膜における分子配向秩序制御と光デバイスへの応用 招待

    小簑剛, 安達千波矢

    レーザー学会学術講演会 第36回年次大会  2016年1月 

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    開催年月日: 2016年1月

    開催地:名古屋   国名:日本国  

  • Triplet exciton management in OLEDs 招待 国際会議

    Chihaya Adachi

    TBRS Symposium  2016年1月 

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    開催年月日: 2016年1月

    開催地:Hong Kong  

  • Improvement of electrical properties of organic films by cold isostatic pressing 国際会議

    Yu Esaki, Toshinori Matsushima, Chihaya Adachi

    Pacifichem 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Hawaii   国名:アメリカ合衆国  

  • Study of intramolecular relaxation processes of thermally activated delayed fluorescence materials for suppressing external quantum efficiency roll-off in organic light-emitting diodes 国際会議

    Munetomo Inoue, Tomas Serevičius, Hajime Nakanotani, Kou Yoshida, Toshinori Matsushima, and Chihaya Adachi

    Pacifichem 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Hawaii   国名:アメリカ合衆国  

  • Long-Lived Phosphorescence Organic Light Emitting Diodes 国際会議

    Naoto Notsuka, Ryota Kabe, Chihaya Adachi

    Pacifichem 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Hawaii   国名:アメリカ合衆国  

  • Suppression of nonradioactive decay from triplet excited stated by weak intermolecular interactions 国際会議

    Ryota Kabe, Naoto Notsuka, Chihaya Adachi

    Pacifichem 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Hawaii   国名:アメリカ合衆国  

  • Dual enhancement of electroluminescence efficiency and operational stability by rapid utilization of triplet excitons for light emission 国際会議

    Taro Furukawa, Hajime Nakanotani, Chihaya Adachi

    Pacifichem 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Hawaii   国名:アメリカ合衆国  

  • Morphology control of organic-inorganic perovskite layers by hot isostaic pressing for efficient planar solar cells 国際会議

    Toshinori Matsushima, Takashi Fujihara, Chuanjiang Qin, Yu Esaki, Sunbin Hwang, Atula S. D. Sandanayaka, Chihaya Adachi

    Pacifichem 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Hawaii   国名:アメリカ合衆国  

  • Room temperature phosphorescence from Coronene@ZIF-8 国際会議

    Hiroyuki Mieno, Ryota Kabe, Naoto Notsuka, Chihaya Adachi

    Pacifichem 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Hawaii   国名:アメリカ合衆国  

  • Operational lifetime enhancement in TADF OLED 国際会議

    Daniel P.K. Tsang and Chihaya Adachi

    Pacifichem 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Hawaii   国名:アメリカ合衆国  

  • High efficiency blue organic light emitting diodes using thermally activated delayed fluorescence 国際会議

    Hiroki Noda, Ryota Kabe, Chihaya Adachi

    Pacifichem 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Hawaii   国名:アメリカ合衆国  

  • Exciton quenching analysis of thermally activated delayed fluorescence molecules by time-resolved photoluminance measurement 国際会議

    Atula S. D. Sandanayaka, Kou Yoshida, Toshinori Matsushima, Chihaya Adachi

    Pacifichem 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Hawaii   国名:アメリカ合衆国  

  • Quasi-cw and cw lasing in organic semiconductors 招待 国際会議

    Atula S.D. Sandanayaka, Li Zhao, Munetomo Inoue, Kou Yoshida, Ju-Hyung Kim, Jean-Charles Ribierre, Chihaya Adachi

    3nd International Workshop on Nano and Bio-Photonics (IWNBP2015) & French-Korean Meeting on Functional Material for Organic Optics, Electronics, and Devices  2015年12月 

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    開催年月日: 2015年12月

    開催地:Cabourg   国名:フランス共和国  

  • Poly(pyridinium phenylene) as n-type material for organic thermoelectric generators 国際会議

    Sunbin Hwang, William J. Potscavage, Jr., Chihaya Adachi

    MRS fall 2015  2015年12月 

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    開催年月日: 2015年12月

    開催地:Boston   国名:アメリカ合衆国  

  • 無限の分子デザインが切り拓く有機EL発光材料ー過去・現在・そして未来への挑戦ー 招待

    安達 千波矢

    有機EL討論会第21回例会  2015年11月 

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    開催年月日: 2015年11月

    開催地:福岡   国名:日本国  

  • ホスト材料による非放射失活抑制効果と残光性有機ELへの応用

    嘉部量太、能塚直人、吉田巧、安達千波矢

    有機EL討論会第21回例会  2015年11月 

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    開催年月日: 2015年11月

    開催地:福岡   国名:日本国  

  • 大電流密度下での有機EL素子駆動 に及ぼすジュール熱の影響

    吉田巧, 中野谷一, 安達千波矢

    有機EL討論会第21回例会  2015年11月 

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    開催年月日: 2015年11月

    開催地:福岡   国名:日本国  

  • Morphological control of organic-inorganic perovskite layers by hot isostatic pressing for efficient planar solar cells 国際会議

    Toshinori Matsushima, Takashi Fujihara, Chuanjiang Qin, Shinobu Terakawa, Yu Esaki, Sunbin Hwang, Atula S. D. Sandanayaka, William J. Potscavage, Jr., Chihaya Adachi

    7th A-COE 2015  2015年10月 

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    開催年月日: 2015年10月

    開催地:Beijing   国名:中華人民共和国  

  • Study on Degradation Mechanism of Perovskite Solar Cells by Thermally Stimulated Current Technique 国際会議

    Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi

    7th A-COE 2015  2015年10月 

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    開催年月日: 2015年10月

    開催地:Beijing   国名:中華人民共和国  

  • Prospect from future organic lasers from the aspect of exciton annihilation 招待 国際会議

    Chihaya Adachi

    7th A-COE 2015  2015年10月 

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    開催年月日: 2015年10月

    開催地:Beijing   国名:中華人民共和国  

  • Degradation Mechanism of Organic Light-emitting Diodes Doped with a Thermally Activated Delayed Fluorescence Emitter 国際会議

    Atula S.D. Sandanayaka, T.Matsushima, C. Adachi

    7th A-COE 2015  2015年10月 

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    開催年月日: 2015年10月

    開催地:Beijing   国名:中華人民共和国  

  • 分子設計が拓く新しい有機発光材料の開拓とデバイス化  〜100%の電気→光変換〜 招待

    安達 千波矢

    CSJ化学フェスタ  2015年10月 

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    開催年月日: 2015年10月

    開催地:東京   国名:日本国  

  • Development of organic light emitting diodes from fluorescence, phosphorescence and delayed fluorescence 招待 国際会議

    Chihaya Adachi

    CIF'16  2015年10月 

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    開催年月日: 2015年10月

    開催地:千歳   国名:日本国  

  • Highly efficient organic light emitting diodes based on thermally activated delayed fluorescence 招待 国際会議

    Chihaya Adachi

    Rank Prize  2015年9月 

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    開催年月日: 2015年9月

    開催地:Grassmere   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • 有機半導体への高圧印加

    松島敏則, 江崎有, 井上棟智, 藤原隆, Chuanjiang Qin, 寺川しのぶ, Sunbin Hwang, Atula S. D. Sandanayaka, William J. Potscavage, Jr., 安達千波矢

    第64回高分子討論会  2015年9月 

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    開催年月日: 2015年9月

    開催地:仙台   国名:日本国  

  • 熱活性型遅延蛍光材料をホストとする高効率青色OLEDの開発

    野田大貴、嘉部量太、安達千波矢

    第76回応用物理学会秋季学術講演会  2015年9月 

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    開催年月日: 2015年9月

    開催地:名古屋   国名:日本国  

  • エピタキシャル成長による有機半導体結晶性薄膜の作製

    新井 啓矢、中野谷 一、安達 千波矢

    第76回応用物理学会秋季学術講演会  2015年9月 

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    開催年月日: 2015年9月

    開催地:名古屋   国名:日本国  

  • 熱間等方圧加圧法を用いた有機・無機ペロブスカイト層のモルホロジー制御

    松島敏則,藤原隆,Chuanjiang Qin,寺川しのぶ,江崎有,Sunbin Hwang,Atula S. D. Sandanayaka,William J. Potscavage, Jr.,安達千波矢

    第76回応用物理学会秋季学術講演会  2015年9月 

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    開催年月日: 2015年9月

    開催地:名古屋   国名:日本国  

  • 冷間等方圧加圧を用いた有機薄膜の凝集状態制御

    江崎 有, 松島 敏則, 安達 千波矢

    第76回応用物理学会秋季学術講演会  2015年9月 

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    開催年月日: 2015年9月

    開催地:名古屋   国名:日本国  

  • 残光性有機発光ダイオード(OLED)のEL特性

    能塚直人、嘉部量太、吉田巧、安達千波矢

    第76回応用物理学会秋季学術講演会  2015年9月 

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    開催年月日: 2015年9月

    開催地:名古屋   国名:日本国  

  • 三重項励起子を利用した光増幅

    古川 太郎、中野谷 一 、安達 千波矢

    第76回応用物理学会秋季学術講演会  2015年9月 

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    開催年月日: 2015年9月

    開催地:名古屋   国名:日本国  

  • 有機レーザ色素の分子内緩和過程に関する研究

    井上 棟智、松島 敏則、安達 千波矢

    第76回応用物理学会秋季学術講演会  2015年9月 

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    開催年月日: 2015年9月

    開催地:名古屋   国名:日本国  

  • ポリピリジニウムフェニレン薄膜のn型熱電特性

    Sunbin Hwang, Chihaya Adachi

    第十二回日本熱電学会学術講演会  2015年9月 

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    開催年月日: 2015年9月

    開催地:福岡   国名:日本国  

  • Highly efficient organic light emitting diodes based on thermally activated delayed fluorescence 招待 国際会議

    Chihaya Adachi

    ISP2015  2015年9月 

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    開催年月日: 2015年9月

    開催地:大阪   国名:日本国  

  • Morphology Control of Organic-inorganic Perovskite Layers by Hot Isostatic Pressing for Efficient Planar Solar Cells 国際会議

    Toshinori Matsushima, Takashi Fujihara, Chuanjiang Qin, Shinobu Terakawa, Yu Esaki, Sunbin Hwang, Atula S. D. Sandanayaka, William J. Potscavage, Jr., and Chihaya Adachi

    KJF2015  2015年9月 

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    開催年月日: 2015年9月

    開催地:Jeju   国名:大韓民国  

  • Highly efficient organic light emitting diodes based on thermally activated delayed fluorescence 招待 国際会議

    Chihaya Adachi

    ECME2015  2015年9月 

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    開催年月日: 2015年9月

    開催地:Strasbourg   国名:フランス共和国  

  • Recent advances in solvent-free liquid molecular electronic devices 招待 国際会議

    Jean-Charles Ribierre, Chihaya Adachi

    7th East Asia Symposium on Functional Dyes and Advanced Materials  2015年9月 

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    開催年月日: 2015年9月

    開催地:大阪   国名:日本国  

  • Current Status of High Efficiency OLEDs Based on Delayed Fluorescence 招待 国際会議

    Chihaya Adachi

    SPIE Organic Photonics + Electronics  2015年8月 

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    開催年月日: 2015年8月

    開催地:San Diego   国名:アメリカ合衆国  

  • Cutting edge science and technology of high efficiency OLED based on delayed fluorescence 招待 国際会議

    Chihaya Adachi

    Fpi-12  2015年7月 

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    開催年月日: 2015年7月

    開催地:Seatle   国名:アメリカ合衆国  

  • Control of the orientation of the light-emitting molecules in spin-coated glassy organic films 国際会議

    L. Zhao, T. Komino, M. Inoue, J.-H. Kim, J.C.Ribierre, C. Adachi

    SPIE Organic Photonics + Electronics  2015年7月 

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    開催年月日: 2015年7月

    開催地:San Diego   国名:アメリカ合衆国  

  • 高効率な青色熱活性型遅延蛍光材料の開発

    野田大貴, 嘉部量太, 安達千波矢

    第10回有機デバイス院生研究会  2015年7月 

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    開催年月日: 2015年7月

    開催地:大阪   国名:日本国  

  • 有機エピタキシャル成長による有機半導体結晶薄膜の作製

    新井啓矢, 中野谷一, 安達千波矢

    第10回有機デバイス院生研究会  2015年7月 

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    開催年月日: 2015年7月

    開催地:大阪   国名:日本国  

  • 電流励起による有機半導体レーザーの実現に向けたTADF過程の利用

    古川太郎, 中野谷一, 安達千波矢

    第10回有機デバイス院生研究会  2015年7月 

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    開催年月日: 2015年7月

    開催地:大阪   国名:日本国  

  • 有機薄膜への酸素の導入によるSinglet-Triplet Annihilationの抑制

    井上棟智, 松島敏則, 中野谷一, 安達千波矢

    第10回有機デバイス院生研究会  2015年7月 

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    開催年月日: 2015年7月

    開催地:大阪   国名:日本国  

  • Compressed organic powders as semiconductors for field-effect transistors

    Toshinori Matsushima, Yu Esaki, Chihaya Adachi

    Eighth International Conference on Molecular Electronics and Bioelectronics (M&BE8)  2015年6月 

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    開催年月日: 2015年6月

    開催地:東京   国名:日本国  

  • スピンコート法による分子配向秩序制御とキャリア注入効率の向上

    小簑剛, 原口翔伊, Jean-Charles Ribieere, 興雄司, 安達千波矢

    有機EL討論会第20回例会  2015年6月 

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    開催年月日: 2015年6月

    開催地:千葉   国名:日本国  

  • 熱活性化遅延蛍光材料をアシストドーパントとした蛍光有機EL素子

    古川 太郎, 中野谷 中野谷 一 , 安達 千波矢

    有機EL討論会第20回例会  2015年6月 

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    開催年月日: 2015年6月

    開催地:千葉   国名:日本国  

  • TADF分子の励起子失活特性

    Atula S. D. Sandanayaka, 吉田巧, ○松島 敏則, 安達千波矢

    有機EL討論会第20回例会  2015年6月 

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    開催年月日: 2015年6月

    開催地:千葉   国名:日本国  

  • Nearly 100% electron-photon conversion by using novel strategy of harvesting triplet excitons in organic light emitting devices 招待 国際会議

    Chihaya Adachi

    EM-NANO2015  2015年6月 

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    開催年月日: 2015年6月

    開催地:新潟   国名:日本国  

  • Highly efficient organic light emitting diodes based on thermally activated delayed fluorescence 招待 国際会議

    Chihaya Adachi

    OP2015  2015年6月 

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    開催年月日: 2015年6月

    開催地:香港  

  • High Efficiency Blue OLEDs based on Thermally Activated Delayed Fluorescence 招待 国際会議

    Chihaya Adachi

    the 2nd International Symposium on AIE  2015年5月 

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    開催年月日: 2015年5月

    開催地:広州   国名:中華人民共和国  

  • Control of the molecular orientation in solution-processed fluorescent OLEDs 国際会議

    J.C. Ribierre, L. Zhao, T. Komino, M. Inoue, J.-H. Kim, C. Adachi

    2015 EMRS Spring Meeting, Symposium  2015年5月 

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    開催年月日: 2015年5月

    開催地:Lille   国名:フランス共和国  

  • 新しい有機発光材料の登場と有機ELへの展開 招待

    安達 千波矢

    新規事業研究会  2015年4月 

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    開催年月日: 2015年4月

    開催地:東京工業大学   国名:日本国  

  • 圧縮粉末を用いた有機トランジスタ

    松島敏則、江崎有、安達千波矢

    第62回応用物理学会春季学術講演会  2015年3月 

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    開催年月日: 2015年3月

    開催地:東海大学   国名:日本国  

  • 有機薄膜への酸素の導入によるSinglet-Triplet Annihilationの抑制

    井上 棟智、松島 敏則、中野谷 一、安達 千波矢

    第62回応用物理学会春季学術講演会  2015年3月 

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    開催年月日: 2015年3月

    開催地:東海大学   国名:日本国  

  • Horizontal molecular orientation in solution-processed organic light-emitting diodes based on an oligofluorene derivative

    L. Zhao, T. Komino, M. Inoue, J.-H. Kim, J.C.Ribierre, C. Adachi

    第62回応用物理学会春季学術講演会  2015年3月 

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    開催年月日: 2015年3月

    開催地:東海大学   国名:日本国  

  • Efficient and Stable Solution-Processed Planar Perovskite Solar Cells

    C. Qin, T. Matsushima, C. Adachi

    第62回応用物理学会春季学術講演会  2015年3月 

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    開催年月日: 2015年3月

    開催地:東海大学   国名:日本国  

  • High efficiency OLED based on delayed fluorescence 国際会議

    Chihaya Adachi

    カネカ国際会議  2015年3月 

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    開催年月日: 2015年3月

    開催地:Seoul   国名:大韓民国  

  • Development of solvent-free tunable and flexible liquid organic semiconductor lasers

    J.C.Ribierre, J.-H. Kim, M. Inoue, L. Zhao, T. Komino, C. Adachi

    第62回応用物理学会春季学術講演会  2015年3月 

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    開催年月日: 2015年3月

    開催地:東海大学   国名:日本国  

  • Exciton Quenching of Thermally Activated Delayed Fluorescence Molecules

    Atula S.D. Sandanayaka, T.Matsushima, C. Adachi

    第62回応用物理学会春季学術講演会  2015年3月 

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    開催年月日: 2015年3月

    開催地:東海大学   国名:日本国  

  • Nearly 100% electron-photon conversion by using novel strategy of harvesting triplet excitons in organic light emitting devices 招待

    Chihaya Adachi

    The WPI-AIMR Joint Seminar The 8th Seminar in FY2014  2015年2月 

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    開催年月日: 2015年2月

    開催地:東北大学   国名:日本国  

  • Nearly 100% electron-photon conversion by using novel strategy of harvesting triplet excitons in organic light emitting devices 招待

    Chihaya Adachi

    I2CNER ANNUAL SYMPOSIUM 2015  2015年2月 

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    開催年月日: 2015年2月

    開催地:九州大学   国名:日本国  

  • Nearly 100% electron-photon conversion by using novel strategy of harvesting triplet excitons in organic light emitting devices 招待 国際会議

    Chihaya Adachi

    MEMD2015  2015年1月 

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    開催年月日: 2015年1月

    開催地:Kowloon Tong  

  • Efficient upconversion of triplets into singlets in organic molecules and OLED application 招待 国際会議

    Chihaya Adachi

    578th WE Heraeus-Seminar  2014年12月 

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    開催年月日: 2014年12月

    開催地:Bonn   国名:ドイツ連邦共和国  

  • High efficiency blue fluorescence organic light-emitting diodes using thermally activated delayed fluorescence process 国際会議

    樋口貴史、中野谷一、安達千波矢

    A-COE2014  2014年11月 

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    開催年月日: 2014年11月

    開催地:Tainan   国名:台湾  

  • Cold isostatic pressing as an effective method to enhance electrical properties of organic films 国際会議

    松島敏則、江崎有、安達千波矢

    A-COE2014  2014年11月 

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    開催年月日: 2014年11月

    開催地:Tainan   国名:台湾  

  • 電流励起下での有機薄膜デバイスにおける励起子失活制御 招待 国際会議

    林 恭平、中野谷 一、井上 棟智、吉田 巧、安達 千波矢

    レーザー学会  2014年11月 

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    開催年月日: 2014年11月

    開催地:京都工芸繊維大学   国名:日本国  

  • Development of organic photovoltaic devices utilizing singlet exciton fission 国際会議

    Yuta Fukutomi, Yu Seok Yang, Takuma Yasuda, Chihaya Adachi

    A-COE2014  2014年11月 

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    開催年月日: 2014年11月

    開催地:Tainan   国名:台湾  

  • High efficiency blue fluorescence organic light-emitting diodes using a thermally activated delayed fluorescence process 国際会議

    Munetomo Inoue、Toshinori Matsushima、Hajime Nakanotania、Chihaya Adachi

    A-COE2014  2014年11月 

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    開催年月日: 2014年11月

    開催地:Tainan   国名:台湾  

  • Development of Low Bandgap π-Conjugated Molecules Having Spontaneous 国際会議

    Keisuke Asahi、Jun Yun Kim、Yu Seok Yang、Takuma Yasuda、Chihaya Adachi

    A-COE2014  2014年11月 

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    開催年月日: 2014年11月

    開催地:Tainan   国名:台湾  

  • Design of Thermally Activated Delayed Fluorescence Materials based on Phthalonitrile Derivatives and their Application in OLEDs 国際会議

    Inseob Park, Sae Youn Lee, Takuma Yasudaa, Chihaya Adachi

    A-COE2014  2014年11月 

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    開催年月日: 2014年11月

    開催地:Tainan   国名:台湾  

  • High performance fluorescent organic light-emitting devices 招待 国際会議

    J.C.Ribierre、C. Adachi

    ISAOP-14  2014年11月 

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    開催年月日: 2014年11月

    開催地:大阪大学   国名:日本国  

  • 有機EL材料のテラヘルツ分光特性計測

    竹田 晴信、陳 聡、小簑 剛、吉岡 宏晃、興 雄司、安達 千波矢

    電気・情報関係学会九州支部第67回連合大会  2014年9月 

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    開催年月日: 2014年9月

    開催地:鹿児島大学   国名:日本国  

  • 冷間等方圧加圧による有機薄膜の電気伝導性の向上

    松島敏則、江崎有、安達千波矢

    第75回応用物理学会秋季学術講演会  2014年9月 

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    開催年月日: 2014年9月

    開催地:名古屋国際会議場   国名:日本国  

  • TADF分子をアシストドーパントとして用いた青色蛍光有機EL素子

    樋口貴史、中野谷一、安達千波矢

    第75回応用物理学会秋季学術講演会  2014年9月 

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    開催年月日: 2014年9月

    開催地:名古屋国際会議場   国名:日本国  

  • TADF過程を利用した高効率蛍光有機EL素子の劣化機構解析

    古川太郎、中野谷一、安達千波矢

    第75回応用物理学会秋季学術講演会  2014年9月 

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    開催年月日: 2014年9月

    開催地:名古屋国際会議場   国名:日本国  

  • Solvent-free liquid molecular semiconductors and their applications in organic optoelectronics 国際会議

    J.C.Ribierre、J.H. Kim、M. Inoue、Z. Li、S. Mery、C. Adachi

    KJF-ICOMEP 2014  2014年9月 

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    開催年月日: 2014年9月

    開催地:Tsukuba International Congress Center   国名:日本国  

  • New Routes of Triplet Harvesting in Organic Light Emitting Diodes 招待 国際会議

    Chihaya Adachi

    ICEL-10  2014年9月 

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    開催年月日: 2014年9月

    開催地:University of Cologne   国名:ドイツ連邦共和国  

  • High-efficiency organic light-emitting diodes with fluorescent emitters via TADF process 招待 国際会議

    Chihaya Adachi

    Utilising triplet excitons in organic electronics  2014年9月 

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    開催年月日: 2014年9月

    開催地:London   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • New Routes of Triplet Harvesting in Organic Light Emitting Diodes 招待 国際会議

    Chihaya Adachi

    SPINOS2014  2014年9月 

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    開催年月日: 2014年9月

    開催地:姫路   国名:日本国  

  • Transient electroluminescence and current responses of organic light-emitting diodes under high current density in microsecond scale 国際会議

    吉田 巧、中野谷 一、張 楽、安達千波矢

    SPIE Optics + Photonics 2014  2014年8月 

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    開催年月日: 2014年8月

    開催地:San Diego   国名:アメリカ合衆国  

  • Development of donor-acceptor-donor type TADF molecules for highly efficient OLEDs 国際会議

    合志憲一、相良雄太、安達千波矢

    SPIE Optics + Photonics 2014  2014年8月 

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    開催年月日: 2014年8月

    開催地:San Diego   国名:アメリカ合衆国  

  • Organic light emitting diodes based on delayed fluorescence 招待 国際会議

    Chihaya Adachi

    Touch Taiwan  2014年8月 

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    開催年月日: 2014年8月

    開催地:Taipei   国名:台湾  

  • Molecular design for high efficiency delayed fluorescence and their application in organic light emitting diodes 招待 国際会議

    Chihaya Adachi

    XXVth IUPAC Photochemistry  2014年7月 

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    開催年月日: 2014年7月

    開催地:Bordeaux   国名:フランス共和国  

  • High efficiency blue organic light emitting diodes based on delayed fluorescence 招待 国際会議

    Chihaya Adachi

    ICSM2014  2014年7月 

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    開催年月日: 2014年7月

    開催地:Turku   国名:フィンランド共和国  

  • 新しい有機発光材料の登場と有機ELへの展開 招待

    安達 千波矢

    光機能材料セミナー  2014年6月 

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    開催年月日: 2014年6月

    開催地:東京工芸大学   国名:日本国  

  • Study on the thermoelectric properties of conducting polymer having a thick film-thickness with the aim of manufacture of flexible organic thermoelectric module. 国際会議

    Sunbin Hwang、William J. Potscavage、Ryosuke Nakamichi、Chihaya Adachi

    International Conference on Thermoelectrics (ICT2014)  2014年6月 

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    開催年月日: 2014年6月

    開催地:Nashville   国名:アメリカ合衆国  

  • Recent progress in ultraflexible organic electronics 国際会議

    Jean-Charles Ribierre

    KOREA-FRANCE Joint Symposium 2014  2014年6月 

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    開催年月日: 2014年6月

    開催地:Seoul   国名:大韓民国  

  • High efficiency organic light-emitting diodes using delayed fluorescence 招待 国際会議

    Chihaya Adachi

    KOREA-FRANCE Joint Symposium 2014  2014年6月 

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    開催年月日: 2014年6月

    開催地:Seoul   国名:大韓民国  

  • New Routes of Triplet Harvesting for High Efficiency Electroluminescence 招待 国際会議

    Chihaya Adachi

    Gordon Research Conference  2014年5月 

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    開催年月日: 2014年5月

    開催地:Barga   国名:イタリア共和国  

  • New Routes of Triplet Harvesting in Organic Light Emitting Diodes 招待 国際会議

    Chihaya Adachi

    2014 MRS Spring Meetings & Exhibits  2014年4月 

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    開催年月日: 2014年4月

    開催地:San Fransisco   国名:アメリカ合衆国  

  • A new route to harvest triplets for high-efficiency organic light-emitting diodes 招待 国際会議

    Chihaya Adachi

    SPIE Photonics Europe 2014  2014年4月 

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    開催年月日: 2014年4月

    開催地:Brussels,   国名:ベルギー王国  

  • 分子設計が拓く新しい発光分子ー高効率熱活性化遅延蛍光材料ーの登場 招待

    安達 千波矢

    Reaxys Prize Club Symposium  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(招待・特別)  

    開催地:名古屋大学   国名:日本国  

  • ベンザゾール誘導体をアクセプターとして用いたTADF材料の開発

    相良 雄太, 志津 功將, 安達 千波矢

    第60回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    開催地:神奈川県厚木市   国名:日本国  

  • 遅延蛍光分子の精密設計と高効率OLEDへの展開

    安達 千波矢

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • 遅延蛍光分子の精密設計と高効率OLEDへの展開

    安達 千波矢

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • カルバゾール修飾ステロイドによる常温リン光

    安達 千波矢, 嘉部 量太

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • 狭バンドギャップπ共役オリゴマーを用いた有機太陽電池の開発

    安達 千波矢, 安田 琢麿, 日高 優

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • 平面型及び屈曲型π共役分子の集積化と電荷輸送特性

    安達 千波矢, 安田 琢麿, YANG YUSEOK, 三重野 寛之

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • 自発的水平配向性を有する狭バンドギャップπ共役分子の開発と有機太陽電池への応用

    安達 千波矢, 安田 琢麿, 朝日 佳祐, Kim Jun Yun

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • 自発的水平配向性を有する狭バンドギャップπ共役分子の開発と有機太陽電池への応用

    安達 千波矢, 安田 琢麿, 朝日 佳祐, Kim Jun Yun

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • ホウ素クラスターをコアとする無機‐有機ハイブリッド半導体分子の合成と有機ELへの応用

    安達 千波矢, 安田 琢麿, 西本 琢朗, Sae Youn Lee

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • ジヒドロフェナジン骨格を有するTADF材料の開発:発光波長ならびに一重項-三重項エネルギーギャプの制御

    安達 千波矢, 安田 琢麿, 志津 功將, 田中 啓之, 李 ジヨン

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • N,N-ビスカルバゾリルアニリンを有する高効率熱活性型遅延蛍光材料の開発

    安達 千波矢, 志津 功將, 田中 啓之, 種田 将嗣

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • N,N-ビスカルバゾリルアニリンを有する高効率熱活性型遅延蛍光材料の開発

    安達 千波矢, 志津 功將, 田中 啓之, 種田 将嗣, 野田 大貴

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • 相互作用密度の概念に基づいた材料設計:熱活性型遅延蛍光材料の開発と有機ELデバイスへの応用

    安達 千波矢, 志津 功將, 田中 啓之, 野田 大貴

    日本化学会第94春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:名古屋大学   国名:日本国  

  • 電界発光素子におけるEL発光効率のRoll-off抑制を目指した4,4'-Bis(carbazol-9-yl)biphenylの分子配向秩序制御

    小簑 剛, 野村 洸子, 小柳 貴裕, 安達 千波矢

    第60回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    開催地:神奈川県厚木市   国名:日本国  

  • ウェット成膜による有機薄膜の特異な凝集状態の形成

    志津 功將, 野村 洸子, 安達 千波矢

    第60回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    開催地:神奈川県厚木市   国名:日本国  

  • オキサジアゾール、トリアゾールを有する高効率熱活性型遅延蛍光材料の開発

    李 ジヨン, 志津 功將, 田中 啓之, 野村 洸子, 安田 琢麿, 安達 千波矢

    第60回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    開催地:神奈川県厚木市   国名:日本国  

  • シクロトリホスファゼン誘導体を用いた有機ELホスト材料の合成と評価

    西本 琢朗, 安田 琢麿, Lee SaeYoun, 安達 千波矢

    日本化学会 第93回春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:滋賀県草津市   国名:日本国  

  • 有機発光材料の新展開―蛍光、リン光、そしてTADFへ― 招待

    安達 千波矢

    日本化学会 第93回春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:滋賀県草津市   国名:日本国  

  • 高効率熱活性化遅延蛍光の創製とデバイスへの効用 招待

    安達 千波矢

    日本化学会 第93回春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:滋賀県草津市   国名:日本国  

  • 4,4'Bis(carbazol-9-yl)biphenyl の分子配向制御と電界発光素子におけるEL効率ロールオフ抑制への応用

    小簑 剛, 野村 洸子, 小柳 貴裕, 安達 千波矢

    日本化学会 第93回春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:滋賀県草津市   国名:日本国  

  • ヘテロアセン類の合成と有機単結晶トランジスタへの応用

    三重野 寛之, 安田 琢麿, YANG YUSEOK, 安達 千波矢

    日本化学会 第93回春季年会  2013年3月 

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    開催年月日: 2013年3月

    開催地:滋賀県草津市   国名:日本国  

  • Highly efficient organic light-emitting diodes by delayed fluorescence 国際会議

    CHIHAYA ADACHI

    APS March Meeting 2013  2013年3月 

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    開催年月日: 2013年3月

    開催地:Baltimore   国名:アメリカ合衆国  

  • Highly efficient organic light-emitting diodes by delayed fluorescence 国際会議

    CHIHAYA ADACHI

    APS March Meeting 2013  2013年3月 

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    開催年月日: 2013年3月

    開催地:Baltimore   国名:アメリカ合衆国  

  • 低温金属接合技術を使った貼り合せ型能動有機ELディスプレイ

    安達 千波矢, 服部 励治, SHIM CHANGHOON, 水野 潤, 笠原 崇史, 江面 知彦

    電子情報通信学会2014総合大会  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(一般)  

    開催地:新潟大学   国名:日本国  

  • HOMO-LUMO重なり密度の制御による高効率熱活性型遅延蛍材料の開発

    安達 千波矢, 野田 大貴, 志津 功將, 田中 啓之

    第61回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • 典型金属錯体による新規熱活性化遅延蛍光材料

    安達 千波矢, 坂井 由美, 野村 洸子, 宮﨑 浩, 相良 雄太

    第61回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • アルゴンガスクラスターイオンビームを用いたXPSによる有機ELデバイスの深さ方向組成解析

    安達 千波矢, 松尾 修司

    第61回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • Roll-off 抑制を目指したキャリア-励起子分離型 OLED の開発

    安達 千波矢, 林 恭平, 中野谷 一, 井上 棟智, 吉田 巧

    第61回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • Roll-off 抑制を目指したキャリア-励起子分離型 OLED の開発

    安達 千波矢, 林 恭平, 中野谷 一, 井上 棟智, 吉田 巧

    第61回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • ホスト混合法を用いた熱活性型遅延蛍光素子の高性能化

    安達 千波矢, 林 恭平, 中野谷 一, 井上 棟智, 吉田 巧

    第61回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • TADF発光材料を用いた全有機層塗布OLEDへの回転マグネットスパッタ法によるAl陰極成膜

    安達 千波矢, 江面 知彦, 鈴木 善丈, 宮﨑 浩

    第61回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • TADF材料を用いた有機EL素子のRoll-off現象における励起子-励起子消滅の影響

    安達 千波矢, 米原 健矢, 高須 勲, 合志 憲一

    第61回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • ガスフロー蒸着により形成した高速成膜共蒸着発光層のOLED 特性

    安達 千波矢, 継田 浩平, 江面 知彦

    第61回応用物理学会春季学術講演会  2013年3月 

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    開催年月日: 2013年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • Third-generation organic light-emitting diodes 招待 国際会議

    Chihaya Adachi

    SPIE photonics West  2013年2月 

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    開催年月日: 2013年2月

    会議種別:口頭発表(招待・特別)  

    開催地:Moscone Center, San Francisco   国名:アメリカ合衆国  

  • Application of Alumina Nano-hole Arrays to Enhancement of Out-coupling Efficiency in OLEDs 招待 国際会議

    Kuniaki Endo, CHIHAYA ADACHI

    Asian Conference on Organic Electronics 2012  2012年12月 

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    開催年月日: 2012年12月

    開催地:山形県山形市   国名:日本国  

  • Third Generation Organic Light Emitting Material 招待 国際会議

    CHIHAYA ADACHI

    Asian Conference on Organic Electronics 2012  2012年12月 

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    開催年月日: 2012年12月

    開催地:山形県山形市   国名:日本国  

  • Enhancement of amplified spontaneous emission properties in organic semiconductor crystal by using dye-doping techniques 国際会議

    Hajime Nakanotani, CHIHAYA ADACHI

    Asian Conference on Organic Electronics 2012  2012年12月 

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    開催年月日: 2012年12月

    開催地:山形県山形市   国名:日本国  

  • Molecular Orientation and Electron Transport Properties of Triphenylene Derivatives for OLEDs 国際会議

    Yuta Sagara, Kazunori Togashi, Takuma Yasuda, CHIHAYA ADACHI

    The 9th SPSJ International Polymer Conference  2012年12月 

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    開催年月日: 2012年12月

    開催地:兵庫県神戸市   国名:日本国  

  • Novel light emitting materials in OLED 招待 国際会議

    CHIHAYA ADACHI

    The 9th SPSJ International Polymer Conference  2012年12月 

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    開催年月日: 2012年12月

    開催地:兵庫県神戸市   国名:日本国  

  • Third Generation organic LED by Hyper Fluorescence 招待 国際会議

    CHIHAYA ADACHI

    EL 2012  2012年12月 

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    開催年月日: 2012年12月

    開催地:HongKong  

  • Development of a fluorescence detection system for micro-flow analysis using an organic light-emitting diode with rare earth metal complexes as an emitting layer

    今任 稔彦, 安達 千波矢

    第50回フローインジェクション分析講演会  2012年11月 

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    開催年月日: 2012年11月 - 2012年12月

    開催地:徳島県徳島市   国名:日本国  

  • 有機発光材料の新展開―蛍光、リン光、そしてTADFへ― 招待

    安達 千波矢

    分子系の複合電子機能第181委員会 第13回研究会  2012年10月 

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    開催年月日: 2012年10月

    開催地:東京都新宿区   国名:日本国  

  • Organic Light-Emitting Diodes using Upconversion Mechanism 招待 国際会議

    CHIHAYA ADACHI

    ISOE 2012  2012年10月 

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    開催年月日: 2012年10月

    開催地:沖縄県国頭郡恩納村   国名:日本国  

  • Organic Light-Emitting Diodes using Upconversion Mechanism 招待 国際会議

    CHIHAYA ADACHI

    ISOE 2012  2012年10月 

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    開催年月日: 2012年10月

    開催地:沖縄県国頭郡恩納村   国名:日本国  

  • Perfomance of a light emitting diode with spectrally narrow emission based on waveguide mode and application to a light source of flow-fluorometry on microchip 国際会議

    Toshihiko Imato, CHIHAYA ADACHI

    12th International Conference on Flow Analysis  2012年9月 

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    開催年月日: 2012年9月

    会議種別:口頭発表(一般)  

    開催地:Thessaloniki, Greece   国名:ギリシャ共和国  

  • Organic Photo Diode as a Detector of Fluorescence Immunoassay: Flow Injection Analysis of Alkylphenol Ethoxylate on a Microchip 国際会議

    Ishimatsu Ryoichi, Toshihiko Imato, CHIHAYA ADACHI

    12th International Conference on Flow Analysis  2012年9月 

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    開催年月日: 2012年9月

    会議種別:口頭発表(一般)  

    開催地:Thessaloniki, Greece   国名:ギリシャ共和国  

  • パンク基盤上に形成した低分子有機ELの薄膜形状と操作条件の関係

    原田 紘伸, 坂上 恵, 深井 潤, 安達 千波矢

    化学工学会第44回秋季年会  2012年9月 

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    開催年月日: 2012年9月

    開催地:宮城県仙台市   国名:日本国  

  • Organic Light-Emitting Diodes Employing Efficient Reverse Intersystem Crossing Aimed for Ultimate EL Efficiency 招待 国際会議

    CHIHAYA ADACHI

    International Conference on Electronic Materials and Nanotechnology for Green Environment  2012年9月 

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    開催年月日: 2012年9月

    開催地:Jeju, Korea   国名:大韓民国  

  • エキサイプレックスの逆項間交差による高効率有機EL素子

    合志 憲一, 安達 千波矢

    秋季第73回応用物理学会学術講演会  2012年9月 

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    開催年月日: 2012年9月

    開催地:愛媛県愛媛市   国名:日本国  

  • エキサイプレックスの逆項間交差による高効率有機EL素子

    合志 憲一, 安達 千波矢

    秋季第73回応用物理学会学術講演会  2012年9月 

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    開催年月日: 2012年9月

    開催地:愛媛県愛媛市   国名:日本国  

  • Molecular Orientation and Electron transport Properties of Novel Triphenylene Derivatives for OLEDs 国際会議

    Yuta Sagara, kazunori Togashi, Takuma Yasuda, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Influence of electric field-induced polaron in organic semiconductors on exciton annihilation process under electrically pumping 国際会議

    Miki Kamoto, Kenichi Goushi, Hiroko Nomura, Takuma Yasuda, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Organic light-emitting diodes aiming for organic semiconductor laser devices 国際会議

    Munetomo Inoue, Kenichi Goushi, Kuniaki Endo, Hiroko Nomura, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Organic Light-Emitting Diodes Based on Conjugated Dithienometalloles 国際会議

    Ryosuke Kondo, Takuma Yasuda, YANG YUSEOK, Kim Jun Yun, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Organic Light Emitting Diodes using Liquid Semiconductors 国際会議

    Shuzo Hirata, Juro Oshima, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Organic charge transfer interfaces on an organic single crystal 国際会議

    Sunbin Hwang, Kenichi Goushi, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Reorganization of Condensed State at Organic/Substrate Interface in Spirofluorene Thin Film under Annealing Treatment 国際会議

    Takeshi Komino, Hiroko Nomura, Masayuki Yahiro, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Synthesis of Oligothiophene-Based Liquid-Crystalline Organic Semiconductors and Their Application to Organic Solar Cells 国際会議

    Takuma Yasuda, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Electroluminescence Based on Thermally Activated Delayed Fluorescence Generated by Spiro Donor-Acceptor Structure 国際会議

    Tetsuya Nakagawa, Gabor Mehes, Keiro Nasu, Hiroko Nomura, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Organic Single-Crystal Transistors Based on π-Extended Heteroluminescence & Organic Optoelectronics 国際会議

    Yang Yu Seok, Takuma Yasuda, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Application of Alumina nano-Hole Arrays to Enhancement of Out-Coupling Efficiency in OLEDs 国際会議

    Kuniaki Endo, Masayuki Yahiro, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Effects of Material Purity on Device Performance of Organic Photovoltaic Cells 国際会議

    CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Flow Electrochemiluminescence of Ru(bpy)3 and Iridium Complexes as a Light Source for Flow Injection 国際会議

    Ishimatsu Ryoichi, Koichi Sugimori, Koji Nakano, Shigeyuki Matsunami, Tomohiko Ezura, Takashi Kasahara, Jun Mizuno, CHIHAYA ADACHI, Toshihiko Imato

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Fluorinated Liquid Semiconductors with High Electrical Stability 国際会議

    Juro Oshima, Shuzo Hirata, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Electron transport properties and durability of new triphenylene derivatives for organic light emitting diodes 国際会議

    Kazunori Togashi, Shintaro Nomura, Norimasa Yokoyama, Takuma Yasuda, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Efficient organic electroluminescence through up-conversion from tripleet to singlet excited states of exciplex 国際会議

    Kenichi Goushi, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Formation of high purity organic thin film using gas flow deposition system 国際会議

    Kohei Tsugita, Tomohiko Ezura, Masayuki Yahiro, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Formation of high purity organic thin film using gas flow deposition system 国際会議

    Kohei Tsugita, Tomohiko Ezura, Masayuki Yahiro, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • Effecy of impurities on device performance in organic thin films 国際会議

    Kohei Tsugita, Tomohiko Ezura, Masayuki Yahiro, CHIHAYA ADACHI

    9th International Conference on Electroluminescence & Organic Optoelectronics  2012年9月 

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    開催年月日: 2012年9月

    開催地:福岡県福岡市   国名:日本国  

  • ウェット成膜による有機薄膜の特異な凝集状態の形成

    小石川 靖, 宮﨑 浩, 八尋 正幸, 安達 千波矢

    第3回 有機分子・バイオエレクトロニクスの未来を拓く若手研究者討論会  2012年8月 

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    開催年月日: 2012年8月

    開催地:岩手県花巻市   国名:日本国  

  • Organic light-emitiign diodes employing efficient reverse intersystem crossing aimed for ultimate EL efficiency 国際会議

    CHIHAYA ADACHI

    SPIE Optics + Photonics, Organic Photonics + Electronics  2012年8月 

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    開催年月日: 2012年8月

    開催地:San Diego, California   国名:日本国  

  • 有機EL発光材料の最前線 招待

    安達 千波矢

    第57回高分子夏季大学  2012年7月 

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    開催年月日: 2012年7月

    会議種別:口頭発表(一般)  

    国名:日本国  

  • 3rd Generation organic light emitting materials in OLED 招待 国際会議

    CHIHAYA ADACHI

    2012 Taiwan-japan Forum for Solid State Lighting Technology  2012年7月 

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    開催年月日: 2012年7月

    開催地:Nantou Country, Taiwan   国名:台湾  

  • Organic light-emitting diodes using novel light emitting mechanism that realizes low-cost and very high efficiency 招待

    CHIHAYA ADACHI

    The 13th International Symposium on the Science and Technology of Lighting  2012年6月 

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    開催年月日: 2012年6月

    開催地:NY   国名:アメリカ合衆国  

  • エレクトロスプレー法を利用した多層型有機EL素子

    小石川 靖, 宮﨑 浩, 八尋 正幸, 安達 千波矢

    有機EL討論会第14回例会  2012年6月 

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    開催年月日: 2012年6月

    開催地:東京都江東区   国名:日本国  

  • エキサイプレックスからの遅延蛍光および有機EL素子への応用

    合志 憲一, 安達 千波矢

    有機EL討論会第14回例会  2012年6月 

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    開催年月日: 2012年6月

    開催地:東京都江東区   国名:日本国  

  • 発光スペクトル狭帯域化有機発光ダイオードの試作とそのフロー分析への応用

    齋藤 寛孝, 石松 亮一, 中嶋 秀, 中野 幸二, 八尋 正幸, 安達 千波矢, 今任 稔彦

    第72回分析化学討論会  2012年5月 

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    開催年月日: 2012年5月

    開催地:鹿児島県鹿児島市   国名:日本国  

  • 新しい有機発光材料の創製―有機EL大変革への可能性― 招待

    安達 千波矢

    高分子同友会  2012年4月 

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    開催年月日: 2012年4月

    開催地:東京都千代田区   国名:日本国  

  • Molecular design of triazine derivatives having a high up-conversion efficiency from triplet into singlet excited states and their application to OLEDs 国際会議

    Lee SaeYoun, Hiroko Nomura, Takuma Yasuda, CHIHAYA ADACHI

    SPIE Photonics Europe  2012年4月 

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    開催年月日: 2012年4月

    開催地:Brussels, Belgium   国名:ベルギー王国  

  • Small molecular organic photovoltaic cells with exciton blocking layer at anode interface for improved device performance 国際会議

    CHIHAYA ADACHI

    SPIE Photonics Europe  2012年4月 

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    開催年月日: 2012年4月

    開催地:Brussels, Belgium   国名:ベルギー王国  

  • Thermally activated delayed fluorescence in a spiro acridane molecule that enhances the EL efficiency in OLEDs 国際会議

    Gabor Mehes, Hiroko Nomura, Tetsuya Nakagawa, CHIHAYA ADACHI

    SPIE Photonics Europe  2012年4月 

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    開催年月日: 2012年4月

    開催地:Brussels, Belgium   国名:ベルギー王国  

  • Theoretical investigation of non-radiative decay in thermally activated delayed fluorescence 国際会議

    Katsuyuki Shizu, Kei Sakanoue, CHIHAYA ADACHI, Toru Sato, Hironori Kaji

    SPIE Photonics Europe  2012年4月 

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    開催年月日: 2012年4月

    開催地:Brussels, Belgium   国名:ベルギー王国  

  • Suppression of propagation loss in organic semiconductor laser devices having low refractive index layers 国際会議

    Munetomo Inoue, Kenichi Goushi, Hayato Kakizoe, Hiroko Nomura, CHIHAYA ADACHI

    2012 Materials Research Society (MRS) Spirng Meeting and Exhibit  2012年4月 

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    開催年月日: 2012年4月

    開催地:San Francisco, California   国名:アメリカ合衆国  

  • Electric field-induced polarion absorption in organic semiconductors and interrelation between ASE threshold and singlet-polaron-annihilation 国際会議

    Miki Kamoto, Kenichi Goushi, Hiroko Nomura, Takuma Yasuda, CHIHAYA ADACHI

    2012 Materials Research Society (MRS) Spirng Meeting and Exhibit  2012年4月 

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    開催年月日: 2012年4月

    開催地:San Francisco, California   国名:アメリカ合衆国  

  • Mechanism of two-dimensional orientation control by mechanical rushing in organic amorphous films 国際会議

    Miki Kamoto, Kenichi Goushi, Hiroko Nomura, Takuma Yasuda, CHIHAYA ADACHI

    2012 Materials Research Society (MRS) Spirng Meeting and Exhibit  2012年4月 

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    開催年月日: 2012年4月

    開催地:San Francisco, California   国名:アメリカ合衆国  

  • Controlling carrier recombination line width in organic single crystal light emitting transistor having split-gate electrodes 国際会議

    Hayato Kakizoe, Kenichi Goushi, Tomohiko Edura and Chihaya Adachi

    Materials Research Society 2011 Fall Meeting  2011年12月 

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    開催年月日: 2011年11月 - 2011年12月

    会議種別:口頭発表(一般)  

    開催地:Boston, Massachusetts   国名:アメリカ合衆国  

  • High Reverse Intersystem Crossing Efficiency in Organic Molecular Thin Films and their Application to Organic Light-Emitting Diodes 国際会議

    Chihaya Adachi

    The 14th Asian Chemical Congress 2011  2011年9月 

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    開催年月日: 2011年9月

    会議種別:口頭発表(一般)  

    開催地:Bangkok   国名:タイ王国  

  • スピロフルオレン薄膜における分子配向制御とASE閾値

    小簑 剛、野村 洸子、八尋 正幸、安達 千波矢

    第72回 応用物理学会学術講演会  2011年9月 

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    開催年月日: 2011年8月 - 2011年9月

    会議種別:口頭発表(一般)  

    開催地:山形県山形市   国名:日本国  

  • スプリットゲート発光トランジスタの発光特性―スプリット幅依存性とキャリア再結合過程の解明

    垣添 勇人、合志 憲一、江面 知彦、安達 千波矢

    第72回 応用物理学会学術講演会  2011年8月 

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    開催年月日: 2011年8月 - 2011年9月

    会議種別:口頭発表(一般)  

    開催地:山形県山形市   国名:日本国  

  • 有機薄膜の熱処理に伴う分子配向緩和過程の動的挙動解析

    小簑 剛、野村 洸子、八尋 正幸、安達 千波矢

    第72回 応用物理学会学術講演会  2011年9月 

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    開催年月日: 2011年8月 - 2011年9月

    会議種別:口頭発表(一般)  

    開催地:山形県山形市   国名:日本国  

  • 有機半導体におけるポーラロン状態の吸収過程の測定

    嘉本 美希、合志 憲一、野村 洸子、安田 琢麿、安達 千波矢

    第72回 応用物理学会学術講演会  2011年8月 

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    開催年月日: 2011年8月 - 2011年9月

    会議種別:口頭発表(一般)  

    開催地:山形県山形市   国名:日本国  

  • スピロビフルオレン誘導体の熱活性化遅延蛍光特性と有機EL素子への応用

    中川 哲也、Sung-Yu Ku、Ken-Tsung Wong、安達 千波矢

    第72回 応用物理学会学術講演会  2011年8月 

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    開催年月日: 2011年8月 - 2011年9月

    会議種別:口頭発表(一般)  

    開催地:山形県山形市   国名:日本国  

  • Horizontally Oriented Amorphous Materials: Their Effects on OLEDs Characteristics

    Jun Yun Kim、安達 千波矢、安田 琢麿

    第72回 応用物理学会学術講演会  2011年8月 

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    開催年月日: 2011年8月 - 2011年9月

    会議種別:口頭発表(一般)  

    開催地:山形県山形市   国名:日本国  

  • Dipolar spirofluorene: highly efficient electroluminescence based on thermally activated delayed fluorescence 国際会議

    Tetsuya Nakagawa, Sung-Yu Ku, Ken-Tsung Wong and Chihaya Adachi

    SPIE 2011 Optics + Photonics  2011年8月 

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    開催年月日: 2011年8月

    会議種別:口頭発表(一般)  

    開催地:San Diego, California   国名:アメリカ合衆国  

  • Exploration of highly luminescent excipiexes and their application to OLEDs 国際会議

    Kou Yoshida, Kenichi Goushi, Keigo Sato and Chihaya Adachi

    SPIE 2011 Optics + Photonics  2011年8月 

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    開催年月日: 2011年8月

    会議種別:口頭発表(一般)  

    開催地:San Diego, California   国名:アメリカ合衆国  

  • Nearly zero-gap formation between singlet-and triplet-excited states and application for organic light emitting diodes 国際会議

    Keigo Sato, Kenichi Goushi and Chihaya Adachi

    SPIE 2011 Optics + Photonics  2011年8月 

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    開催年月日: 2011年8月

    会議種別:口頭発表(一般)  

    開催地:San Diego, California   国名:アメリカ合衆国  

  • High efficiency singlet exciton production pathway under electrical excitation 国際会議

    Chihaya Adachi

    International workshop on Organic Composite Optoelectronic Materials and Devices 2011  2011年8月 

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    開催年月日: 2011年8月

    会議種別:口頭発表(一般)  

    開催地:Weihai, Shangdong   国名:中華人民共和国  

  • Fluorometric flow immunoassay for IgA by using microchip integrated with organic thin film photodiode 国際会議

    Mayo Miyake, Nobuaki Soh, Koji Nakano, Masayuki Yahiro, Chihaya Adachi, Akihide Hemmi, Hizuru Nakajima, Katsumi Uchiyama , Toshihiko Imato

    17th International Conferece on Flow Injection Analysis including related techniques  2011年7月 

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    開催年月日: 2011年7月

    会議種別:口頭発表(一般)  

    開催地:Krakow   国名:ポーランド共和国  

  • 新規骨格を有するトリフェニレン誘導体の電子輸送特性

    富樫 和法、野村 真太朗、横山 紀昌、安田 琢麿、安達 千波矢

    有機EL討論会 第12回例会  2011年6月 

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    開催年月日: 2011年6月 - 2011年7月

    会議種別:口頭発表(一般)  

    開催地:東京都江東区   国名:日本国  

  • Formulation of Organic Crystalline Nano-Pillar Structures and their Application to Organic Solar Cells 国際会議

    Masaya Hirade, Hajime Nakanotani, Masayuki Yahiro and Chihaya Adachi

    The 37th International Symposium on Compound Semiconductors(iscs2010)  2010年6月 

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    開催年月日: 2011年5月 - 2011年6月

    開催地:香川県高松市(高松シンボルタワー)   国名:日本国  

  • Control of moelcular aggregation in organic thin films aimed for high device performance 招待

    安達 千波矢

    OLED 100 Summer School  2011年5月 

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    開催年月日: 2011年5月

    会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    国名:ドイツ連邦共和国  

  • Moleculaly-oriented and electron -transport materials for organic light-emitting diodes 国際会議

    Kazunori Togashi, Norimasa Yokoyama and Chihaya Adachi

    Materials Research Society 2011 Spring Meeting  2011年4月 

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    開催年月日: 2011年4月 - 2012年5月

    会議種別:口頭発表(一般)  

    開催地:San Francisco, California   国名:アメリカ合衆国  

  • Efficient upconversion of triplet excitons into singlet state using organic donor-acceptor combination and their application for OLEDs 国際会議

    Keigo Sato, Kenichi Goushi and Chihaya Adachi

    Materials Research Society 2011 Spring Meeting  2011年4月 

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    開催年月日: 2011年4月

    会議種別:口頭発表(一般)  

    開催地:San Francisco, California   国名:アメリカ合衆国  

  • 有機EL材料の新展開~新発光機構~ 招待

    安達 千波矢

    ファインテック ジャパン  2011年4月 

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    開催年月日: 2011年4月

    会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    国名:日本国  

  • Horizontal Orientaion of Planar Type-hole Transport Moecules and Their Application for Organic Light-emitting Diodes Aimed for Lo9w Driving Voltage 国際会議

    Kim Jun Yun and Chihaya Adachi

    Materials Research Society 2010 Fall Meeting  2010年11月 

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    開催年月日: 2010年11月 - 2010年12月

    開催地:マサチューセッツ州ボストン市(Hynes Convention Center)   国名:アメリカ合衆国  

  • Orgaic Light Emitting Diode Having a Liquid Emitting Layer Doped with an Organic Salt 国際会議

    Heo Hyo Jung, Shuzo Hirata, Korefumi Kubota, Osamu Hirata, Kenichi Goushi, Masayuki Yahiro and Chihaya Adachi

    Materials Research Society 2010 Fall Meeting  2010年11月 

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    開催年月日: 2010年11月 - 2010年12月

    開催地:マサチューセッツ州ボストン市(Hynes Convention Center)   国名:アメリカ合衆国  

  • 有機半導体レーザーを目指した材料・デバイス設計 招待

    安達 千波矢

    第2回 福岡・熊本 有機エレクロニクス研究交流会  2010年11月 

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    開催年月日: 2010年11月

    開催地:熊本大学、熊本県   国名:日本国  

  • High Performance Organic Field Effect Transistor by using Main Chain Conduction 国際会議

    Takuji Kato, Mao Yasumatsu, Chikao Origuchi, Kyoji Tsutsui and Chihaya Adachi

    Asian Conference on Organic Electronics (A-COE 2010)  2010年11月 

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    開催年月日: 2010年11月

    会議種別:口頭発表(一般)  

    開催地:ソウル市(ソウル大学)   国名:大韓民国  

  • Efficient Green Couprous-Based OLEDs Using a High Triplet Energy Host 国際会議

    Qisheng Zhang, Shigeyuki Matsunami and Chihaya Adachi

    Asian Conference on Organic Electronics (A-COE 2010)  2010年11月 

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    開催年月日: 2010年11月

    会議種別:口頭発表(一般)  

    開催地:ソウル市(ソウル大学)   国名:大韓民国  

  • Improvement of electroluminescence performance of organic light emitting diodes with a liquid emitting layer 国際会議

    Shuzo Hirata, Korefumi Kubota, Heo Hyo Jung, Osamu Hirata, Kenichi Goushi, Masayuki Yahiro and CHihaya Adachi

    Asian Conference on Organic Electronics (A-COE)  2010年11月 

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    開催年月日: 2010年11月

    会議種別:口頭発表(一般)  

    開催地:ソウル(ソウル大学)   国名:大韓民国  

  • Investigation of organic thermovoltaic devices by utilizing a layered structure of pentacene and fullerene thin films 国際会議

    Mao Sumino, Kentaro Harada and Chihaya Adachi

    Asian Conference on Organic Electronics (A-COE 2010)  2010年11月 

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    開催年月日: 2010年11月

    開催地:ソウル市(ソウル大学)   国名:大韓民国  

  • Novel Organic Light Emitting Mechanism Useful for OLED 招待 国際会議

    Chihaya Adachi

    Asian Conference on Organic Electronics (A-COE 2010)  2010年11月 

     詳細を見る

    開催年月日: 2010年11月

    会議種別:口頭発表(招待・特別)  

    開催地:ソウル市(ソウル大学)   国名:大韓民国  

  • Recent Progress in Organic Light Emitting Materials and Devices 招待 国際会議

    Chihaya Adachi

    Asian Conference on Organic Electronics 2010  2010年11月 

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    開催年月日: 2010年11月

    会議種別:口頭発表(一般)  

    開催地:ソウル大学   国名:日本国  

  • Recent Progress in Organic Light Emitting Materials and Devices 招待 国際会議

    Chihaya Adachi

    Asian Conference on Organic Electronics 2010  2010年11月 

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    開催年月日: 2010年11月

    会議種別:口頭発表(一般)  

    開催地:ソウル大学   国名:日本国  

  • High-mobility field effect transistor based on vacuum deposited 2,7-dioctyl[1]benzothieno[3,2-b]benzothiophene(C8-BTBT)thin film 国際会議

    Hyun Jung Seo, Marika Furukawa, Yuichi Sadamitsu, Masaaki Ikeda, Masayuki Yahiro, Kazuo Takimiya, and Chihaya Adachi

    Asian Conference on Organic Electronics (A-COE 2010)  2010年11月 

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    開催年月日: 2010年11月

    開催地:ソウル市(ソウル大学)   国名:大韓民国  

  • High Efficiency thermally activated dlayed fluorescence and tis application 国際会議

    Keigo Sato, Ayataka Endo and Chihaya Adachi

    Asian Conference on Organic Electronics (A-COE 2010)  2010年11月 

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    開催年月日: 2010年11月

    開催地:ソウル市(ソウル大学)   国名:大韓民国  

  • High Efficiency thermally activated dlayed fluorescence and tis application 国際会議

    Keigo Sato, Ayataka Endo and Chihaya Adachi

    Asian Conference on Organic Electronics (A-COE 2010)  2010年11月 

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    開催年月日: 2010年11月

    開催地:ソウル市(ソウル大学)   国名:大韓民国  

  • Clarification of charge transport characteristics in liquid organic semiconductors 国際会議

    Korefumi Kubota, Shuzo Hirata, Kenichi Goushi and Chihaya Adachi

    Asian Conference on Organic Electronics (A-COE 201)  2010年11月 

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    開催年月日: 2010年11月

    開催地:ソウル市(ソウル大学)   国名:日本国  

  • High reverse intersystem crossin gefficiency of exciplex states 国際会議

    Kou Yoshida, Kenichi Goushi, Keigo Sato and Chihaya Adachi

    Asian Conference on Organic Electronics (A-COE 2010)  2010年11月 

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    開催年月日: 2010年11月

    開催地:ソウル市(ソウル大学)   国名:大韓民国  

  • Efficient up-conversion of triplet excitons into singlet state and the aplication for organic light emitting diodes 招待 国際会議

    Chihaya Adachi

    8th International Conference on Electroluminescence and Organic Optoelectronics  2010年10月 

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    開催年月日: 2010年10月

    開催地:University of Michigan, Ann Arbor   国名:アメリカ合衆国  

  • Orientation Control of Disk-like hole transport molecules and their applicaton in OLEDs aimed for low driving voltage 国際会議

    Kim Jun Yun, Chihaya Adachi and Daisuke Yokoyama

    韓国高分子学会 2010年 定期秋季総会及び研究論文発表会  2010年10月 

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    開催年月日: 2010年10月

    開催地:釜山市(EXCOホール)   国名:大韓民国  

  • 液体有機半導体を発光層に有する有機EL素子の発光特性の改善

    平田 修造、久保田 是史、Jung Heo Hyo、平田 修、合志 憲一、八尋 正幸、安達 千波矢

    第71回応用物理学学術講演会  2010年9月 

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    開催年月日: 2010年9月

    会議種別:口頭発表(一般)  

    開催地:長崎県長崎市(長崎大学文教キャンパス)   国名:日本国  

  • 1,4-Bis((10-((4-3,7-dimenthyloctyloxy)phenyl)ethynyl)anthracen-9-yl)ethynyl)benzene薄膜における結晶成長方向制御とキャリア輸送特性

    小簔 剛、八尋 正幸、折田 明浩、大寺 純蔵、安達 千波矢

    第71回応用物理学学術講演会  2010年9月 

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    開催年月日: 2010年9月

    会議種別:口頭発表(一般)  

    開催地:長崎県長崎市(長崎大学文教キャンパス)   国名:日本国  

  • エキサイプレックス状態の高い逆項間交差確率の検証

    吉田 巧、安達 千波矢

    第71回秋季応用物理学会学術講演会  2010年9月 

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    開催年月日: 2010年9月

    開催地:長崎県長崎市(長崎大学文教キャンパス)   国名:日本国  

  • 液体有機半導体のキャリア電導機構の解析

    久保田 是史、 平田 修造、合志 憲一、安達 千波矢

    第71回 応用物理学会学術講演会  2010年9月 

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    開催年月日: 2010年9月

    会議種別:口頭発表(一般)  

    開催地:長崎県長崎市(長崎大学 文教キャンパス)   国名:日本国  

  • エキサイプレックス形成に基づく有機磁気抵抗

    合志 憲一、安達 千波矢

    第71回応用物理学学術講演会  2010年9月 

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    開催年月日: 2010年9月

    会議種別:口頭発表(一般)  

    開催地:長崎県長崎市(長崎大学文教キャンパス)   国名:日本国  

  • ペンタセンおよびフラーレン薄膜積層構造による熱電素子の検討

    隅野 真央、原田 健太郎、安達 千波矢

    第71回応用物理学会学術講演会  2010年9月 

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    開催年月日: 2010年9月

    開催地:長崎県長崎市(長崎大学 文教キャンパス)   国名:日本国  

  • 常温畜光機能を有する有機材料の実現

    平田 修造、安達 千波矢

    2010年 光化学討論会  2010年9月 

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    開催年月日: 2010年9月

    開催地:千葉県千葉市(千葉大学西千葉キャンパス)   国名:日本国  

  • 有機EL発光材料の新展開 招待

    安達 千波矢

    日本化学会 第4回関東支部大会  2010年8月 

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    開催年月日: 2010年8月

    会議種別:口頭発表(一般)  

    開催地:筑波大学筑波キャンパス、茨城県つくば市   国名:日本国  

  • Third Generation Organic Light Emitting Material useful for OLED 国際会議

    Chihaya Adachi

    Korea-Japan Joint Forum 2010 on Organic Materials for Electronics and Photonics  2010年8月 

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    開催年月日: 2010年8月

    会議種別:口頭発表(一般)  

    開催地:北九州国際会議場   国名:日本国  

  • Horizontall Orientation of Hole Transport Molecules and their Application for Organic Light-emitting Diodes Aimed for Low Driving Voltage 国際会議

    Kim Jun Yun, Daisuke Yokoyama and Chihaya Adachi

    Korea-Japan Joing Forum(KJF 2010)  2010年8月 

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    開催年月日: 2010年8月

    開催地:福岡県北九州市小倉北区(北九州国際会議場)   国名:日本国  

  • Improvement of Emitting Properties in Organic Light Emitting Diode having Liquid Emitting Layer 国際会議

    Heo Hyo Jung, Shuzo Hirata, Korefumi Kubota, Osamu Hirata, Kenichi Goushi, Masayuki Yahiro and Chihaya Adachi

    Korea-Japan Joing Forum 2010 (KJF 2010)  2010年8月 

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    開催年月日: 2010年8月

    開催地:福岡県北九州市小倉北区(北九州国際会議場)   国名:日本国  

  • Formulation of Cylindrical Shaped Organic Light Emitting Diode Etched by Damage Free Neutral Beam 国際会議

    Junji Adachi, Tomohiro Kubota, Masayuki Yahiro, Seiji Samukawa and Chihaya Adachi

    Korea-Japan Joint Forum 2010 (KJF 2010)  2010年8月 

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    開催年月日: 2010年8月

    開催地:福岡県北九州市小倉北区(北九州国際会議場)   国名:日本国  

  • High efficiency long lived room temperature phosphorescence of organic materials under the atmosphre 国際会議

    Shuzo Hirata, Kenro Totani, Junxiang Zhang, Takashi Yamashita, Hironori Kaji, Toshiyuki Watanabe, Seth Richard Marder and Chihaya Adachi

    XXIII IUPAC symposium in Photochemistry  2010年7月 

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    開催年月日: 2010年7月

    開催地:Ferrara   国名:イタリア共和国  

  • Enhancement of delayed luminescence through triplet-triplet annihilation in organic light-emitting diodes having nano-aggregated structures

    Shuzo Hirata, Kousuke Oishi and Chihaya Adachi

    XXIII IUPAC Symposium in Photochemistry  2010年7月 

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    開催年月日: 2010年7月

    開催地:Ferrara   国名:イタリア共和国  

  • Thermolectric properties of n-doped C60 and p-doped pentacene films for application in organic thermovoltaic devices 国際会議

    Mao Sumino, Kentaro Harada and Chihaya Adachi

    The 20th International Conference on Science and Technology of Synthetic Metals 2010 (ICSM 2010)  2010年7月 

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    開催年月日: 2010年7月

    開催地:京都府京都市(京都国際会館)   国名:日本国  

  • Organic light emitting diodes using exciton up-convention mechanism of thermally stimulated delayed fluorescence 招待 国際会議

    Chihaya Adachi

    International Conference on Science and Technology of Synthetic Metals 2010  2010年7月 

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    開催年月日: 2010年7月

    会議種別:口頭発表(一般)  

    開催地:京都国際会議場、京都   国名:日本国  

  • Electro-luminescence mechanism in ambipolar transistor based on dye-doped organic crystal 国際会議

    Hayato Kakizoe and Chihaya Adachi

    The 20th International Conference on Science and Technology of Synthetic Metals  2010年7月 

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    開催年月日: 2010年7月

    会議種別:口頭発表(一般)  

    開催地:京都府京都市(京都国際会館)   国名:日本国  

  • Emission Mechanism of High Efficiency Thermally Activated Delayed Fluorescence and the Application to Organic Light Emitting Diodes 国際会議

    Keigo Sato and Chihaya Adachi

    The 20th International Conference on Science and Technology of Synthetic Metals 2010 (ICSM 2010)  2010年7月 

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    開催年月日: 2010年7月

    開催地:京都府京都市(京都国際会館)   国名:日本国  

  • Organic Magnetoresistance based onto Exciplex Formation 国際会議

    Kenichi Goushi and Chihaya Adachi

    International Conference on Science and Technology of Synthetic Metals 2010 (ICSM2010)  2010年7月 

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    開催年月日: 2010年7月

    開催地:京都府京都市(京都国際会議場)   国名:日本国  

  • Organic Magnetoresistance based onto Exciplex Formation 国際会議

    Kenichi Goushi and Chihaya Adachi

    International Conference on Science and Technology of Synthetic Metals 2010 (ICSM2010)  2010年7月 

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    開催年月日: 2010年7月

    開催地:京都府京都市(京都国際会議場)   国名:日本国  

  • Control of orientation of star-shaped amorphous films in OLEDs aimed for low driving voltage

    Kim Jun Yun and Chihaya Adachi

    The 20th International Conference on Science and Technology of Synthetic Metals  2010年7月 

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    開催年月日: 2010年7月

    会議種別:口頭発表(一般)  

    開催地:京都府京都市(京都国際会館)   国名:日本国  

  • Organic light-emitting diode with liquid emitting layer 国際会議

    Korefumi Kubota and Chihaya Adachi

    The 20th International Conference on Science and Technology of Synthetc Metals 2010 (ICSM 2010)  2010年7月 

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    開催年月日: 2010年7月

    開催地:京都府京都市(京都国際会館)   国名:日本国  

  • 高効率熱活性化遅延蛍光の発現とOLEDへの応用

    佐藤 圭悟、安達 千波矢

    有機EL討論会 第10回例会  2010年6月 

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    開催年月日: 2010年6月

    会議種別:口頭発表(一般)  

    開催地:東京都江東区(日本科学未来館)   国名:日本国  

  • Orientation control of disk-like hole transport molecules in OLEDS aimed for low driving voltage

    Kim Jun Yun, Chihaya Adachi

    有機EL討論会 第10回例会  2010年6月 

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    開催年月日: 2010年6月

    会議種別:口頭発表(一般)  

    開催地:東京都江東区(日本科学未来会)   国名:日本国  

  • 未来を拓く有機光エレクトロニクス―新しいプラスチックエレクトロニクスの幕開け 招待

    安達 千波矢

    第6回 九大・北大 合同フロンティア・セミナー  2010年6月 

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    開催年月日: 2010年6月

    会議種別:口頭発表(一般)  

    開催地:東京都千代田区(東京ステーションカンファレンス)   国名:日本国  

  • Up-Conversion of Molecular Excitons from Triplet into Singlet Excited States and Their Application into Organic Light Emitting Diodes 招待 国際会議

    Chihaya Adachi

    International Symposium on Functional π-Electron Systems  2010年5月 

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    開催年月日: 2010年5月

    会議種別:口頭発表(一般)  

    開催地:Georgia Institute of Technology, Atlanta   国名:アメリカ合衆国  

  • Optical environments and resonators for gain based polymer thin-film structures 招待 国際会議

    Chihaya Adachi

    SPIE Photonics Europe  2010年4月 

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    開催年月日: 2010年4月

    会議種別:口頭発表(一般)  

    開催地:The Square Conference Center, Brussels   国名:ベルギー王国  

  • 常温大気中での長励起状態寿命状態を有する有機材料によって発現する蓄光機能や低闘値過飽和吸収機能

    平田 修造、戸谷 健朗、安達 千波矢

    第90回日本化学会春季年会  2010年3月 

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    開催年月日: 2010年3月

    開催地:大阪府大阪市(近畿大学本部キャンパス)   国名:日本国  

  • 非コヒーレント光に応答する有機逆過飽和吸収体の材料設計

    平田 修造、戸谷 健朗、安達 千波矢

    第90回日本化学会春季年会  2010年3月 

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    開催年月日: 2010年3月

    開催地:大阪府大阪市(近畿大学本部キャンパス)   国名:日本国  

  • 液体有機半導体を発光層に用いた液体OLEDの構築

    久保田 是史、合志 憲一、八尋 正幸、安達 千波矢

    第57回応用物理学関係連合講演会  2010年3月 

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    開催年月日: 2010年3月

    開催地:神奈川県平塚市(東海大学)   国名:日本国  

  • 色素ドープされた有機結晶両極性発光トランジスタにおける発光機構

    中野谷 一、安達 千波矢

    第57回応用物理学関係連合講演会  2010年3月 

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    開催年月日: 2010年3月

    開催地:神奈川県平塚市(東海大学)   国名:日本国  

  • 高効率熱活性化遅延蛍光材料のPL特性及びOLEDへの応用

    遠藤 礼隆、安達 千波矢

    第57回応用物理学関係連合講演会  2010年3月 

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    開催年月日: 2010年3月

    開催地:神奈川県平塚市(東海大学)   国名:日本国  

  • 両極性発光型有機ドープ結晶トランジスタの低温物性

    垣添 勇人、安達 千波矢

    第57回応用物理学関係連合講演会  2010年3月 

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    開催年月日: 2010年3月

    開催地:神奈川県平塚市(東海大学)   国名:日本国  

  • 高効率熱活性化遅延蛍光現象の発光機構解析

    佐藤 圭吾、安達 千波矢

    第57回応用物理学関係連合講演会  2010年3月 

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    開催年月日: 2010年3月

    開催地:神奈川県平塚市(東海大学)   国名:日本国  

  • 長寿命三重項励起子を有するドナー置換芳香族の高効率項間交差の要因

    平田 修造、安達 千波矢

    第57回応用物理学関係連合講演会  2010年3月 

     詳細を見る

    開催年月日: 2010年3月

    開催地:神奈川県平塚市(東海大学)   国名:日本国  

  • 非コヒーレント定常光で動作するオプティカルリミッター

    平田 修造、安達 千波矢

    第57回応用物理学関係連合講演会  2010年3月 

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    開催年月日: 2010年3月

    開催地:神奈川県平塚市(東海大学)   国名:日本国  

  • Novel Organic Reversible Saturable Absorber Activated by Weak Optical Input. 国際会議

    Shuzo Hirata and Chihaya Adachi

    2009 MRS fall meeting  2009年11月 

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    開催年月日: 2009年11月 - 2009年12月

    開催地:Boston(John. B. Hynes Convention Center)   国名:アメリカ合衆国  

    Novel Organic Reversible Saturable Absorber Activated by Weak Optical Input

  • Effects of Horizontal Molecular Orientation on Charge Transport Characteristics in Organic Amorphous Films

    Daisuke Yokoyama, Akio Sakaguchi, Michio Suzuki, and Chihaya Adachi

    2009年11月 

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    開催年月日: 2009年11月 - 2009年12月

    開催地:Boston(John. B. Hynes Convention Center)   国名:日本国  

  • Thermally Activated Delayed Fluoresncence From Sn4+-Porphyrin Complexes and Their Application to Organic Light Emitting Diodes-A Novel Mechanism for Electroluminescence 国際会議

    Ayataka Endo, Mai Ogasawara, Atsushi Takahashi, Daisuke Yokoyama , Yoshimine Kato and Chihaya Adachi

    2009 MRS Fall Meeting  2009年11月 

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    開催年月日: 2009年11月 - 2009年12月

    国名:アメリカ合衆国  

  • Light emitting devices based on organic single crystals 国際会議

    中野谷 一、 安達 千波矢

    International Meeting on Information Display  2009年10月 

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    開催年月日: 2009年10月

    開催地:Kintex   国名:大韓民国  

  • Surface Modification of Organic Thin Films by Nautral Beam Irradiation 国際会議

    M.Hirade, T.Kubota, Y.Tsuru, M.Yahiro, K.Miyazaki, S.Samukawa and C.Adachi

    2009 International Conference on Solid State Devices and Materials  2009年10月 

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    開催年月日: 2009年10月

    開催地:宮城県仙台市(仙台国際ホテル)   国名:日本国  

    Surface Modification of Organic Thin Films by Nautral Beam Irradiation

  • Surface Modification of Organic Thin Films by Neutral Beam Irradiation 国際会議

    M. Hirade, T.Kubota, Y.Tsuru, M.Yahiro, K.Miyazaki

    2009 International Conference Solid State Devices and Materials (SSDM2009)  2009年10月 

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    開催年月日: 2009年10月

    開催地:宮城県仙台市(仙台国際ホテル)   国名:日本国  

    Surface Modification of Organic Thin Films by Neutral Beam Irradiation

  • Studies on Thermally Activated Delayed Fluorescence:Novel Excition Formation Mechanism for OLEDs 国際会議

    Ayataka Endo, Chihaya Adachi

    International Conference on Solid State Devices and Materials(SSDM2009)  2009年10月 

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    開催年月日: 2009年10月

    開催地:宮城県仙台市(仙台国際ホテル)   国名:日本国  

    Studies on Thermally Activated Delayed Fluorescence:Novel Excition Formation Mechanism for OLEDs

  • Low Power Organic Light Emitting Devices 招待 国際会議

    Chihaya Adachi

    2009 International Conference on Solid State Devices and Materials  2009年10月 

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    開催年月日: 2009年10月

    会議種別:口頭発表(招待・特別)  

    開催地:宮城県仙台市(仙台国際ホテル)   国名:日本国  

    Low Power Organic Light Emitting Devices

  • 真空蒸着中における有機アモルファス膜の光学異方性in-situ測定

    横山 大輔、安達 千波矢

    第70回応用物理学会学術研究会  2009年9月 

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    開催年月日: 2009年9月

    開催地:富山県富山市(富山大学)   国名:日本国  

  • Oligo(p-ohenylenevinylene)単結晶における電界効果移動度の共役長依存性

    中野谷 一、斎藤 雅俊、中村 浩昭、安達 千波矢

    第70回応用物理学学術講演会  2009年9月 

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    開催年月日: 2009年9月

    開催地:富山大学   国名:日本国  

  • 「Oligo(p-phenylenevinylene)単結晶における電界効果移動度の共役長依存性」

    中野谷 一、 斎藤 雅俊、中村 浩昭、安達 千波矢

    秋季第70回応用物理学会学術講演会  2009年9月 

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    開催年月日: 2009年9月

    開催地:富山市 (富山大学)   国名:日本国  

  • 「Approach of International Cooperation and Activities at ISIT」 国際会議

    Masayuki  Yahiro

    The 4th Yeungnam University-Kyushu University Joint Symposium  2009年9月 

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    開催年月日: 2009年9月

    開催地:Gyeonbuk,   国名:大韓民国  

  • Approachi of International Cooperation and Activities at ISIT 招待 国際会議

    Masayuki Yahiro

    The 4th Yeungnam University-Kyushu University Joint Symposium  2009年9月 

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    開催年月日: 2009年9月

    会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:Seoul (Yeungnam University)   国名:大韓民国  

  • Organic light emitting devices having multi-layer structure of thin film organic single crystals 国際会議

    中野谷 一、安達 千波矢

    SPIE Optics + Photonics  2009年8月 

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    開催年月日: 2009年8月

    開催地:San Diego Convention Center   国名:アメリカ合衆国  

    Organic light emitting devices having multi-layer structure of thin film organic single crystals

  • 「Organic light emitting devices having multi-layer structure of thin-film organic sigle crystals」 国際会議

    Hajime Nakanotani, Chihaya Adachi

    SPIE Optics + Photonics  2009年8月 

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    開催年月日: 2009年8月

    開催地:San Diego, California (San Diego Convention Center)   国名:アメリカ合衆国  

  • オキサジアゾール分子の配向による電子輸送特性への影響

    横山 大輔

    有機EL討論会 第8回例会  2009年6月 

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    開催年月日: 2009年6月

    開催地:東京都(日本科学未来館、みらいCANホール)   国名:日本国  

  • Novel approaches for OLEDs and organic laser 招待

    Chihaya Adachi

    Fifth International Conference on Molecular Electronic and Bioelectronic  2009年3月 

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    開催年月日: 2009年5月 - 2009年3月

    会議種別:口頭発表(招待・特別)  

    開催地:Miyazaki (Miyazaki International Conference Hall)   国名:日本国  

  • Light-emitting Ambipolar Field-effect Transistors using Organic Single Crystals 国際会議

    Hajime Nakanotani, Chihaya Adachi

    2009 MRS Spring Meeting  2009年4月 

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    開催年月日: 2009年4月

    開催地:San Francisco(San Francisco Marriott)   国名:アメリカ合衆国  

    Light-emitting Ambipolar Field-effect Transistors using Organic Single Crystals

  • 主鎖電動を利用したポリジアセチレンLB膜の電界効果トランジスタ

    田中 里多朗、折口 千佳子、加藤 拓司、筒井 恭治、安達 千波矢

    第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:筑波大学 筑波キャンパス   国名:日本国  

  • 中性粒子ビーム照射による有機薄膜の疑集状態制御と光学・電気特性

    平出 雅哉、久保田 智広、鶴 廣彦、八尋 正幸、宮崎 康次、寒川 誠二、安達 千波矢

    第56回応用物理学関係連合講演会  2009年4月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県つくば市(筑波大学)   国名:日本国  

  • アモルファス性分子の配向による電荷輸送性への影響(1)分子の配向制御と輸送性の変化

    横山 大輔、吉村 和明、坂口 明生、鈴木 道夫、安達 千波矢

    第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県つくば市(筑波大学)   国名:日本国  

  • アモルファス性分子の配向による電荷輸送性への影響(1)オキサジアゾールの電子輸送性

    横山 大輔、吉村 和明、坂口 明生、鈴木 道夫、安達 千波矢

    第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県つくば市(筑波大学)   国名:日本国  

  • レーザーアニールを用いた有機半導体の配向制御と高移動化

    久保田 是史、加藤 拓司、安達 千波矢

    第56回応用物理学関係連合講演会  2009年4月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:筑波大学 筑波キャンパス   国名:日本国  

  • 低分子有機材料の自己組織的ナノドット形成

    中田 学、安松 真麻、八尋 正幸、安達 千波矢

    第56回応用物理学関係連合講演会  2009年4月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県つくば市(筑波大学)   国名:日本国  

  • 有機単結晶を用いた有機EL素子

    中野谷 一、安達 千波矢

    第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県つくば市(筑波大学)   国名:日本国  

  • 主鎖伝導を利用したポリジアセチレンLB膜の電界効果トランジスタ

    田中 里多朗、折口 千佳子、加藤 拓司、筒井 恭治、安達 千波矢

    春季第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年5月

    開催地:茨城県 つくば市(筑波大学)茨城県 つくば市(筑波大学)   国名:日本国  

  • アモルファス性分子の配向による電荷輸送性への影響(1)

    横山 大輔、瀬戸口 陽介、坂口 明生、鈴木 道夫、安達 千波矢

    春季第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県 つくば市(筑波大学)   国名:日本国  

  • 電子ドナー性ペリレンジイミドを用いた有機薄膜太陽電池

    柴野 祐紀、今堀 博、安達 千波矢

    春季第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県 つくば市(筑波大学)   国名:日本国  

  • アモルファス性分子の配向による電荷輸送性への影響(2)

    横山 大輔、瀬戸口 陽介、坂口 明生、鈴木 道夫、安達 千波矢

    春季第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県 つくば市(筑波大学)   国名:日本国  

  • レーザーアニールを用いた有機半導体の配向制御と高移動度化

    久保田 是史、安達 千波矢、加藤 拓司

    春季第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県 つくば市(筑波大学)   国名:日本国  

  • 低分子有機材料の自己組織的ナノドット形成

    中田 学、安松 真麻、八尋 正幸、安達 千波矢

    春季第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県 つくば市(筑波大学)   国名:日本国  

  • 有機単結晶薄膜を用いた有機EL素子

    中野谷 一、安達 千波矢

    春季第56回応用物理学関係連合講演会  2009年3月 

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    開催年月日: 2009年3月 - 2009年4月

    開催地:茨城県 つくば市(筑波大学)   国名:日本国  

  • 有機アモルファス膜中における分子の平行配向とデバイス特性への影響 招待

    横山 大輔、坂口 明生、鈴木 道夫、安達 千波矢

    日本化学会第89回春季年会  2009年3月 

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    開催年月日: 2009年3月

    会議種別:口頭発表(一般)  

    開催地:千葉県 船橋市 (日本大学 理工学部船橋キャンパス)   国名:日本国  

  • Highly efficient light emitting transistor with multifunctional electrodes

    Tung-Huei KE, Robert Gehlhaar, Chung-Chih Wu, Chih-Hsin Chen, Jiann-T Lin, and Chihaya Adachi

    Fifth International Conference on Molecular Electronic and Bioelectronic  2009年3月 

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    開催年月日: 2009年3月

    開催地:Miyazaki (Miyazaki International Conference Hall)   国名:日本国  

  • アモルファス性有機半導体膜内における分子配向

    横山 大輔、坂口 明生、鈴木 道夫、安達 チ波矢

    電子情報通信学会 有機エレクトロニクス研究会  2009年3月 

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    開催年月日: 2009年3月

    開催地:東京都 港区(機械振興会館)   国名:日本国  

  • Recombination zone shift in unipolar light-emitting field effect transistors and its influence on light emission

    Robert Gehlhaar, Tung-Huei KE, and Chihaya Adachi

    Insitute for Material Research  2009年1月 

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    開催年月日: 2009年1月

    開催地:Sendai, Miyagi (Tohoku University)   国名:日本国  

  • High efficiency organic light emitting transistors based on spirofluorene-derivative with multifunctional electrodes

    Tung-Huei KE, Robert Gehlhaar, Chung-Chin Wu, Chih-Hsin Chen, Jiann-T Lin, and Chihaya Adachi

    Institute for Material Research  2009年1月 

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    開催年月日: 2009年1月

    開催地:Sendai, Miyagi (Tohoku University)   国名:日本国  

  • Charge separation and transport behavior at two dimensional charge sheet of donor/acceptor heterointerfaces 国際会議

    Tomo Sakanoue, Tooru Irie and Chihaya Adachi

    2008 Material Research Society Fall Meeting (MRS 2008)  2008年12月 

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    開催年月日: 2008年12月

    開催地:Boston, Massachusetts (Hynes Convention Center)   国名:アメリカ合衆国  

  • Blue-light-emitting ambipolar organic single crystal field-effect transistors 国際会議

    Hajime Nakanotani, R.Kabe, M.Yahiro, T.Takenobu, Y.Iwasa and C.Adachi

    2008 Materials Reserach Society Fall Meeting (MRS)  2008年12月 

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    開催年月日: 2008年12月

    開催地:Boston, Massachusetts(Hynes Convention Center)   国名:アメリカ合衆国  

  • Phoophysical and electroluminescent properties of SnF2-OEP having thermally 国際会議

    Ayataka Endo, Mai Ogasawara, Atsushi Takahashi, Yoshimine Kato and Chihaya Adachi

    2008 Material Research Society Fall Meeting (MRS2008)  2008年12月 

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    開催年月日: 2008年12月

    開催地:Boston, Massachusetts (Hynes Convention Center)   国名:アメリカ合衆国  

  • 2,7bis[4-(N-carbazole)phenylvinyl]-9,9'-spirobifluoreneを活性層に用いた低闘値青色First-order DFBレーザー

    平出 雅哉、中野谷 一、池田 昇裕、服部 励治、八尋 正幸、安達 千波矢

    平成20年度応用物理学会九州支部学術講演会  2008年11月 

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    開催年月日: 2008年11月

    開催地:宮崎県 宮崎市(宮崎大学 木花キャンパス)   国名:日本国  

  • 熱活性化遅延蛍光を発光層に用いた新機構有機LED

    遠藤 礼隆、小笠原 舞、高橋 敦史、加藤 喜峰、安達 千波矢

    有機EL討論会第7回例会  2008年11月 

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    開催年月日: 2008年11月

    開催地:石川県 金沢市 (金沢市文化ホール)   国名:日本国  

  • アモルファス性発光層・電荷輸送層における分子の平行配向

    横山 大輔、坂口 明生、鈴木 道夫、安達 千波矢

    有機EL討論会第7回例会  2008年11月 

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    開催年月日: 2008年11月 - 2007年11月

    開催地:石川県 金沢市(金沢市文化ホール)   国名:日本国  

  • THermally activated delayed fluorescence(TADF)from Sn4+-Porphyrin complex and their electroluminescence characteristics 国際会議

    Chihaya Adachi

    The 28th International Display Research Conference (IDRC 2008)  2008年11月 

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    開催年月日: 2008年11月

    開催地:Florida(University of Central Florida)   国名:アメリカ合衆国  

  • C60 活性層を有するFETの絶縁膜界面、電極界面制御

    木下 昇平、八尋 正幸、安達 千波矢

    薄膜材料デバイス研究会第5回研究集会  2008年11月 

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    開催年月日: 2008年10月 - 2008年11月

    開催地:奈良県 奈良市(なら 百年会館)   国名:日本国  

  • Effect of molecular aggregation on amplified spontaneous emission of bis-styrylbenzene derivatives

    Ryota Kabe, Hajime Nakanotani, Masayuki Yahiro and Chihaya Adachi

    Prof.Jean-Marie Lehn Symposium III  2008年10月 

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    開催年月日: 2008年10月

    開催地:Fukuoka (Nishijin Plaza)   国名:日本国  

  • Effect of molecular aggregation on amplified spontaneous emission of bis-styrylbenzene derivatives

    Ryota Kabe, Hajime Nakanotani, Masayuki Yahiro and Chihaya Adachi

    20th Korea-Japan Joint Forum  2008年10月 

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    開催年月日: 2008年10月

    開催地:Hokkaido, Chitose (Chitose Insititute of Science and Technology(CIST))   国名:日本国  

  • Blue-light emitting ambipolar field-effect transistors using an organic single crystal of 1,4-bis(4-methylstyryl)benzene and their application for orgnic laser

    Hajime Nakanotani, R.kabe, M.Yahiro, T.Takenobu, Y.Iwasa and C.Adachi

    20th Korea-Japan Joint Forum  2008年10月 

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    開催年月日: 2008年10月

    開催地:Hokkaido, Chitose, Japan(Chitose Institute of Science and Technology(CIST))   国名:日本国  

  • Light extraction efficiency of organic field-effect transistors analyzed by a three-dimensional finite difference time domaiin method 国際会議

    Robert Gehlhaar, Masayuki Yahiro and Chihaya Adachi

    7th International Conference on Electroluminescenceof Molecular Materials and Related Phenomena (ICEL7)  2008年9月 

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    開催年月日: 2008年9月

    開催地:Dresden (Technische Universitat Dresden)   国名:ドイツ連邦共和国  

  • Materials and device architecture design for organic laser devices 招待 国際会議

    Chihaya Adachi

    7th International Conference on Electroluminescence of Molecular Materials and Related Phenomena (ICEL7)  2008年9月 

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    開催年月日: 2008年9月

    会議種別:口頭発表(一般)  

    開催地:Dresden (Technische Universitat Dresden)   国名:ドイツ連邦共和国  

  • キャリア注入障壁を障壁を低減したOLEDの高電流密度下におけるRoll-Off特性の改善

    瀬戸口 陽介、松島 敏則、安達 千波矢

    第69回応用物理学会学術講演会  2008年9月 

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    開催年月日: 2008年9月

    開催地:愛知県 春日井市(中部大学)   国名:日本国  

  • 正孔・電子輸送材料の有機アモルファス膜における分子の平行配向

    横山 大輔、坂口 明生、鈴木 道夫、安達 千波矢

    第69回応用物理学会学術講演会  2008年9月 

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    開催年月日: 2008年9月

    開催地:愛知県 春日井市(中部大学)   国名:日本国  

  • 両電極に厚いAg層を用いた微小共振器OLEDからの電極貫通狭帯域表面発光

    横山 大輔、安達 千波矢

    第69回応用物理学会学術講演会  2008年9月 

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    開催年月日: 2008年9月

    開催地:愛知県 春日井市(中部大学)   国名:日本国  

  • 1,4Bis(4-methylstyryl)benzene 単結晶を用いた青色両極性発光型トランジスタ

    中野谷 一、嘉部 量太、八尋 正幸、安達 千波矢

    第69回応用物理学会学術講演会  2008年9月 

     詳細を見る

    開催年月日: 2008年9月

    開催地:愛知県 春日井市(中部大学)   国名:日本国  

  • Ambipolar organic field effect transistor aiming for efficient electroluminescence 国際会議

    C.Adachi, M.Yahiro, T.Sakanoue, H.Nakanotani

    SPIE Optics + Photonics  2008年8月 

     詳細を見る

    開催年月日: 2008年8月 - 2008年9月

    開催地:San Diego   国名:アメリカ合衆国  

  • Blue-light-emitting ambipolar field-effect transistors using an organic single crystal of 1,4-bis(4-methlstyryl)benzene 国際会議

    H.Nakanotani, R.Kabe, M.Yahiro, T.Takenobu, Y.Iwasa and C.Adachi

    International Symposium on Organic Transistors and Functional Interfaces  2008年8月 

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    開催年月日: 2008年8月

    開催地:Montana Resort Iwanuma, Sendai   国名:日本国  

  • FDTD Simulations of exterminal light out-coupling efficiency of organic field-effect transistors 国際会議

    Robert Gehlhaar, Tomo Sakanoue, Masayuki Yahiro, and Chihaya Adachi

    SPIE Optics & Photonics 2008  2008年8月 

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    開催年月日: 2008年8月

    開催地:San Diego, California (San Diego Convention Center)   国名:アメリカ合衆国  

  • ドナー/アクセプター有機薄膜界面におけるキャリア分離・輸送

    入江暢、 安達千波矢

    第5回応用物理学関係連合講演会  2008年3月 

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    開催年月日: 2008年7月

    開催地:日本大学 理工学部 船橋キャンパス   国名:日本国  

  • 有機アモルファス膜内における分子の平行配向

    横山 大輔、坂口 明生、鈴木 道夫、安達 千波矢

    有機EL討論会第6回例会S2-2  2008年6月 

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    開催年月日: 2008年6月

    開催地:東京都 港区 (日本科学未来館)   国名:日本国  

  • Molecular design of organic semiconductors aiming for high-performance OLEDs, OFETs, and organic laser diodes 招待 国際会議

    Chihaya Adachi

    The SID International Symposium, Seminar & Exhibition  2008年5月 

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    開催年月日: 2008年5月

    会議種別:口頭発表(一般)  

    開催地:Los Angeles, California(Los Angeles Convention Center)   国名:アメリカ合衆国  

  • 電流励起型有機半導体レーザーを目指したFirst-Order DFB共振器の作成とレーザー特性

    平出 雅哉、中野谷 一、服部 励冶、八尋 正幸、 安達 千波矢

    ナノ学会第6回大会  2008年5月 

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    開催年月日: 2008年5月

    開催地:福岡県 福岡市 (九州大学医学部百年講堂)   国名:日本国  

  • バルクヘテロ型有機太陽電池の高効率化のためのデバイス設計

    大石 康介、八尋 正幸、安達 千波矢

    ナノ学会第6回大会  2008年5月 

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    開催年月日: 2008年5月

    開催地:福岡県 福岡市 (九州大学医学部百年講堂)   国名:日本国  

  • 有機光デバイスの新展開・有機レーザーダイオード、有機・無機ハイブリッドデバイスの創製 招待

    安達 千波矢

    ナノ学会第6回大会  2008年5月 

     詳細を見る

    開催年月日: 2008年5月

    開催地:福岡県 福岡市(九州大学医学部百年講堂)   国名:日本国  

  • ドナー/アクセプターヘテロ界面における二次元電荷シートの形成

    入江 暢、坂上 知、安達 千波矢

    ナノ学会第6回大会  2008年5月 

     詳細を見る

    開催年月日: 2008年5月

    開催地:ナノ学会第6回大会   国名:日本国  

  • Materials design of organic semiconductors for organic laser diodes 招待 国際会議

    Chihaya Adachi

    Taiwan-Japan International Symposium on Organic Chemistry and Molecular Science  2008年4月 

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    開催年月日: 2008年4月 - 2009年4月

    会議種別:口頭発表(一般)  

    開催地:Taipei (National Taipei University of Technology)   国名:台湾  

  • Characteristics of edge emission at cutoff wavelength from edge of electrically pumped organic light-emitting diodes 国際会議

    Daisuke Yokoyama, Hajime Nakanotani, Yousuke Setoguchi, Masato Moriwake, Dai Ohnishi, Masayuki Yahiro and Chihaya Adachi

    SPIE Europe Photonics  2008年4月 

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    開催年月日: 2008年4月 - 2009年4月

    開催地:Strasbourg(Palais de la Musique et des Congres)   国名:フランス共和国  

  • Characteristics of edge emission at cutoff wavelength from electrically pumped organic light-emitting diodes 国際会議

    D.Yokoyama, H.Nakanotani, Y.Setoguchi, M.Morikawa, D.Ohnishi, Rohm Co., M. Yahiro and C.Adachi

    Photonics Europe 2008 (SPIE)  2008年4月 

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    開催年月日: 2008年4月

    国名:フランス共和国  

  • 有機単結晶-酸化物半導体ヘテロ構造を有する両極性トランジスタ

    中野谷一、 矢野公規、 八尋正幸、 安達千波矢

    第55回応用物理学関係連合講演会  2008年3月 

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    開催年月日: 2008年3月

    開催地:日本大学 理工学部 船橋キャンパス   国名:日本国  

  • キャリア注入・発生層制御による有機LEDの低電圧化

    八尋正幸、松島敏則、Hsiao-Wen Hung、入江暢、坂上知、安達千波矢

    日本化学会第88回春季年会  2008年3月 

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    開催年月日: 2008年3月

    開催地:立教大学   国名:日本国  

  • Spectrally very Narrow Emission Under very Low Excitation Power 国際会議

    Daisuke Yokoyama, Yosuke Setoguchi, Masayuki Yahiro and Chihaya Adachi

    2008 MRS Spring Meeting  2008年3月 

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    開催年月日: 2008年3月

    開催地:San Francisco   国名:アメリカ合衆国  

  • Molecular design of Organic semiconductors Aiming for High-Performance OLEDs, OFETs, and Organic Laser Diodes 招待

    C.Adachi

    Display Week 2008, The SID Internaitonal Symposium, Seminar & Exhibitation  2008年3月 

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    開催年月日: 2008年3月

    開催地:Los Angeles   国名:アメリカ合衆国  

  • 有機半導体レーザーダイオードを目指した材料・デバイス設計

    安達千波矢

    ナノテクノロジー分野別バーチャルラボ成果報告会  2008年1月 

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    開催年月日: 2008年1月

    開催地:新都市ホール   国名:日本国  

  • Frontier of Organic Light Emiting Devices

    C.Adachi

    2007年12月 

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    開催年月日: 2007年12月

    開催地:IIT Bombay   国名:インド  

  • Low Driving Voltage OLED Using Phenanthrene Oligomers as Electron Transport Layer 国際会議

    H.W.Hung, N.Yokoyama, M.Yahiro, C.Adachi

    2007 International Symposium on Flexible Electronics and Displays Taiwan (ISFED)  2007年12月 

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    開催年月日: 2007年12月

    開催地:Ambassador Hotel, Hsinchu, Taiwan   国名:台湾  

  • 有機発光ダイオード、有機発光トランジスタ、有機レーザーの現状と将来

    安達千波矢

    第18回光物性研究会  2007年12月 

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    開催年月日: 2007年12月

    開催地:大阪市立大学、学術情報総合センター   国名:日本国  

  • Very Low-threshold ASE Characteristics of Bis-styrylbenzene Derivatives and Their Electrical Pumping aiming for Organic Laser Diode 国際会議

    C.Adachi

    ICAMD2007  2007年12月 

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    開催年月日: 2007年12月

    開催地:Jeju   国名:大韓民国  

  • 有機レーザーダイオードの最前線―超低閾値材料の開発と光増幅特性

    安達千波矢、中野谷一、横山大輔、嘉部量太、八尋正幸

    応用物理学会九州支部学術講演会  2007年12月 

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    開催年月日: 2007年12月

    国名:日本国  

  • 有機発光薄膜デバイスの新展開

    安達千波矢、松島敏則、中野谷一、坂上知、八尋正幸

    薄膜材料デバイス研究会 第4回研究集会  2007年11月 

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    開催年月日: 2007年11月

    開催地:龍谷大学   国名:日本国  

  • Organic light emitting devices from OLED to organic laser diode

    Chihaya Adachi, Toshinori Matsushima, Hajime Nakanotani, Daisuke Yokoyama, Masayuki Yahiro

    Optical Fiber Communication and Optoelectronics Conference, 2007 Asia  2007年10月 

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    開催年月日: 2007年10月

    開催地:Shanghai   国名:中華人民共和国  

  • Organic Laser Diode-Materials, Devices and Applications 国際会議

    C.Adachi

    International Joint Symposium (Kyushu University and Yeungnam University)  2007年9月 

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    開催年月日: 2007年9月

    開催地:Yeungnam University   国名:大韓民国  

  • ビススチリルベンゼン誘導体単結晶からのASE発振 Amplified Spontaneous Emission from Single Crystal of Bis-Styryl Derivatives

    嘉部量太、 八尋正幸、 安達千波矢

    第68回応用物理学会学術講演会  2007年9月 

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    開催年月日: 2007年9月

    開催地:北海道工業大学   国名:日本国  

  • 表面プラズモンを介した長距離エネルギー移動による有機EL素子からの発光

    中野谷一、 安達千波矢

    第66回応用物理学会学術講演会  2007年9月 

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    開催年月日: 2007年9月

    国名:日本国  

  • カットオフモードに起因する有機膜端面からの狭帯域発光(2): レーザーダイオードへの展開

    横山大輔、 安達千波矢

    第68回応用物理学会学術講演会  2007年9月 

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    開催年月日: 2007年9月

    会議種別:口頭発表(一般)  

    開催地:北海道工業大学   国名:日本国  

  • フェナンスレンオリゴマーを電子輸送層に用いた低駆動電圧有機LED

    Hung Hsiao-Wen 、 横山紀昌、 安達千波矢

    第68回応用物理学会学術講演会  2007年9月 

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    開催年月日: 2007年9月

    開催地:北海道工業大学   国名:日本国  

  • Relaxation of Roll-0ff Characteristics in Organic Electrophorescence Diodes 国際会議

    K.S.Son, M.Yahiro, T.Imai, H.Yoshizaki and C.Adachi

    IMID 2007  2007年8月 

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    開催年月日: 2007年8月

    国名:大韓民国  

  • Thermally stimulated current法によるC60/絶縁層界面の電子トラップ準位の測定

    松島敏則,八尋正幸,安達千波矢

    2007年春季 第54回応用物理学関係連合講演会  2007年3月 

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    開催年月日: 2007年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学 相模原キャンパス   国名:日本国  

  • 9,9'-spirobifluorene誘導体を活性層とする発光性有機トランジスタ

    中野谷一、 秋山誠治、 八尋正幸、 大西大、 守分政人、 吉原利忠、 飛田成史、 安達千波矢

    第54回応用物理学関係連合講演会  2007年3月 

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    開催年月日: 2007年3月

    国名:日本国  

  • 9,9’-spirobifluorene誘導体を活性層とする発光性有機トランジスタ

    中野谷一, 秋山誠治, 八尋正幸, 大西大, 守分政人, 吉原利忠, 飛田成史, 安達千波矢

    第54回応用物理学会学術講演会  2007年3月 

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    開催年月日: 2007年3月

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • 有機-無機ヘテロ構造を有する両極性トランジスタ

    中野谷一、 矢野公規、 八尋正幸、 安達千波矢

    第54回応用物理学関係連合講演会  2007年3月 

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    開催年月日: 2007年3月

    開催地:青山学院大学   国名:日本国  

  • High Efficiency Fluorescence Materials having phenylene Vinylene and Ethynylene Units and Their Application for OLED 国際会議

    L.Fenenco, G.Mao, A.Orita and C.Adachi

    The Fourth International Conference on Molecular Electronics and Bioelectronics (M&BE4)  2007年3月 

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    開催年月日: 2007年3月

    開催地:Tokyo   国名:日本国  

  • “新規な高効率熱活性化遅延蛍光性ポルフィリン誘導体の開発と有機LEDへの展開”

    高橋敦史,遠藤礼隆,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

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    会議種別:口頭発表(一般)  

    開催地:武蔵工大   国名:日本国  

  • “新規電子輸送性キノリン誘導体の開発と有機LEDへの応用”

    高橋敦史,遠藤礼隆,安達千波矢

    第66回応用物理学会学術講演会  2005年9月 

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    会議種別:口頭発表(一般)  

    開催地:徳島大   国名:日本国  

  • “高効率熱活性化遅延蛍光材料の開発と有機EL発光材料への展開”

    高橋敦史,安達千波矢

    第53回高分子討論会  2004年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “チリルベンゼン誘導体の低閾値ASE特性(EASE=0.5&micro;J/cm2)”

    四十物孝憲、山本英利,河村祐一郎,合志憲一,佐々木正臣,雀部博之,安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

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    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “有機半導体レーザーに用いる低閾値化を目指したスチリル系蛍光材料の分子設計”

    四十物孝憲、山本英利、河村祐一郎、皐月真、安達千波矢

    第64回応用物理学会学術講演会  2003年8月 

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    会議種別:口頭発表(一般)  

    開催地:福岡大学   国名:日本国  

  • 発光性トランジスタの基礎物性と高性能化

    坂上知

    日本学術振興会第142委員会C部会有機光エレクトロニクス部会第14回研究会  2006年7月 

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    会議種別:口頭発表(一般)  

    開催地:九州大学   国名:日本国  

  • 青色発光材料を用いた Ambipolar 発光性トランジスタの作製

    坂上知,内生蔵広幸,八尋正幸,安達千波矢,松重和美

    第54回応用物理学関係連合講演会  2007年3月 

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    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • “チャネル長1um 以下の Au-Al 非対称型電極による発光性有機トランジスタの高効率化”

    坂上知,内生蔵広幸,八尋正幸,奥良彰,下地規之,松重和美,安達千波矢

    第67回応用物理学会学術講演会  2006年9月 

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    会議種別:口頭発表(一般)  

    開催地:立命館大学   国名:日本国  

  • “ペリレン誘導体のn型半導体FET特性”

    大澤信晴、安達千波矢

    第50回応用物理学会関係連合講演会  2003年3月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • アリール置換窒素ヘテロ環化合物のキャリヤー輸送性とOLED特性

    孫京秀,今井敏郎,吉崎浩樹,安達千波矢

    第55回高分子討論会  2006年9月 

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    会議種別:口頭発表(一般)  

    開催地:富山大学   国名:日本国  

  • “4, 4’-bis[9-dicarbazolyl]-2, 2’-biphenyl (CBP)のピコ秒時間分解発光スペクトル“

    孫京秀,河村祐一郎,安達千波矢,三品具文,山本夕可,中原純一郎

    第66回応用物理学会学術講演会  2005年9月 

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    会議種別:口頭発表(一般)  

    開催地:徳島大   国名:日本国  

  • 高効率有機発光デバイスに向けた有機半導体材料開発

    安田 琢麿, 安達 千波矢

    応用物理学会 有機分子・バイオエレクトロニクス分科会研究会  2013年3月 

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    開催地:福岡県福岡市   国名:日本国  

  • 第三世代有機エレクトロルミネッセンス材料

    安達 千波矢

    第130回微小光学研究会  2013年12月 

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    開催地:九州大学 筑紫キャンパス   国名:日本国  

  • 高効率熱活性化遅延蛍光の登場−有機発光材料の新展開−

    安達 千波矢

    第10回薄膜材料デバイス研究集会  2013年10月 

     詳細を見る

    開催地:龍谷大学   国名:日本国  

  • 有機発光材料の新展開ー高効率遅延蛍光材料の登場ー 招待

    安達 千波矢

    錯体化学会第63回討論会シンポジウム  2013年10月 

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    会議種別:口頭発表(一般)  

    開催地:琉球大学   国名:日本国  

  • 新しい有機発光材料の登場と有機ELへの展開 招待

    安達 千波矢

    新化学技術推進協会 電子情報技術部会・エレクトロニクス交流会  2013年9月 

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    会議種別:口頭発表(一般)  

    開催地:公益社団法人 新化学技術推進協会 会議室   国名:日本国  

  • 革新的な有機発光材料の登場と光エレクトロニクスへの応用

    安達 千波矢

    第25回配位化合物の光化学討論会  2013年8月 

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    会議種別:口頭発表(一般)  

    開催地:佐賀県唐津市(唐津ロイヤルホテル)   国名:日本国  

  • 有機発光デバイスの基礎 招待

    安達 千波矢

    化学技術基礎講座「電子部品・材料の物性化学」  2013年8月 

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    会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:化学会館   国名:日本国  

  • Novel organic light emitting material

    安達 千波矢

    第一回WPI材料科学ワークショップ-第10回日仏ナノマテリアルワークショップ  2013年6月 

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    開催地:京都府京都市   国名:日本国  

  • 熱活性型遅延蛍光材料を用いた高効率有機ELの開発

    安達 千波矢

    有機EL討論会  2013年6月 

     詳細を見る

    開催地:東京都(日本科学未来館)   国名:日本国  

  • 分子設計の自由度を生かした有機EL発光材料の新展開

    安達 千波矢

    高分子材料研究会  2013年1月 

     詳細を見る

    開催地:山口大学   国名:日本国  

  • 有機EL関係の最近の進展と日本の立場 招待

    安達 千波矢

    レーザー学会学術講演会第34回年次大会公開特別講演会  2013年1月 

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    開催地:北九州国際会議場   国名:日本国  

  • 有機発光材料の新展開―蛍光、リン光、そしてTADFへ― 招待

    安達 千波矢

    第5回IPDA研究会  2012年12月 

     詳細を見る

    開催地:福岡県福岡市   国名:日本国  

  • 有機発光材料の新展開―蛍光、リン光、そしてTADFへ― 招待

    安達 千波矢

    レーザー学会第433回研究会  2012年11月 

     詳細を見る

    開催地:京都府京都市   国名:日本国  

  • Organic Solar Cells Utilizing Horizontally Oriented Amorphous Molecules

    安達 千波矢, Jun Seoung Park, Kim Jun Yun, 安田 琢麿

    高分子学会 2013  2013年6月 

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    会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:京都府京都市   国名:日本国  

  • 熱活性型遅延蛍光材料を用いた電気化学発光

    安達 千波矢, Ken-Tsung Wong, 中川 哲也, Sung-Yu Ku

    光情報分子科学研究会 第1回講演会  2013年11月 

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    開催地:京都   国名:日本国  

  • Development of Organic Solar Cells Based on Low Band Gap Liquid Crystalline Conjugated Molecules

    安達 千波矢, Woong Shin, 安田 琢麿

    高分子学会 2013  2013年6月 

     詳細を見る

    会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:京都府京都市   国名:日本国  

  • Development of Organic Solar Cells Based on Low Band Gap Liquid Crystalline Conjugated Molecules

    安達 千波矢, Woong Shin, 安田 琢麿

    高分子学会 2013  2013年6月 

     詳細を見る

    会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:京都府京都市   国名:日本国  

  • Self-Assembling Mesomorphic Materials Based on Diketopyrrolopyrrole for High Efficient Organic Solar Cell 国際会議

    安達 千波矢, Woong Shin, 安田 琢麿

    第21 回日本化学会九州支部・韓国釜山合同セミナー  2013年6月 

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    開催地:韓国釜山 釜慶大学   国名:大韓民国  

  • Development of a fluorescence detection system for micro-flow analysis assembled with an organic light emitting diode and an organic photodiode

    安達 千波矢, 中野 幸二, 今任 稔彦, 石松 亮一, 八尋 正幸, 劉 蓉

    第51回フローインジェクション分析討論会  2013年11月 

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    開催地:熊本大学   国名:日本国  

  • Eu錯体を用いた狭帯発光有機EL素子の作製とこれを光源とするフローインジェクション/蛍光分析

    安達 千波矢, 中野 幸二, 今任 稔彦, 石松 亮一, 八尋 正幸, 劉 蓉, 國澤 栄里

    第51回フローインジェクション分析討論会  2013年11月 

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    開催地:熊本大学   国名:日本国  

  • 狭帯発光スペクトルを有する有機ELを光源にもちいるフローインジェクション/蛍光イムノアッセイ

    安達 千波矢, 中野 幸二, 今任 稔彦, 石松 亮一, 八尋 正幸, 杉森 康一

    第51回フローインジェクション分析討論会  2013年11月 

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    開催地:熊本大学   国名:日本国  

  • 熱活性型遅延蛍光材料による電気化学発光を光源に用いるフロー蛍光分析法の開発

    安達 千波矢, 中野 幸二, 今任 稔彦, 石松 亮一, 水野 潤, 笠原 崇史, 江面 知彦, 松波 成行

    日本分析化学会第62年会  2013年9月 

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    会議種別:口頭発表(一般)  

    開催地:近畿大学   国名:日本国  

  • Eu錯体を用いた狭帯発光有機EL素子の作製とそのマイクロフロー光分析への応用

    安達 千波矢, 中野 幸二, 今任 稔彦, 石松 亮一, 八尋 正幸, 國澤 栄里, 劉 蓉

    日本分析化学会第62年会  2013年9月 

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    会議種別:口頭発表(一般)  

    開催地:近畿大学   国名:日本国  

  • カルバゾール‐トリアジン誘導体の熱活性化遅延蛍光特性

    安達 千波矢, 中川 哲也, Tomas Serevičius, Ken-sung Wong

    第74回応用物理学会秋季学術講演会  2013年9月 

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    会議種別:口頭発表(一般)  

    開催地:同志社大学 京田辺キャンパス   国名:日本国  

  • 熱活性型遅蛍光材料を用いた電気化学発光:フロー光源への応用の基礎検討

    安達 千波矢, 今任 稔彦, 石松 亮一, 江面 知彦, 水野 潤, 笠原 崇史, 松波 成行, 中野 幸二

    第73回分析化学討論会  2013年5月 

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    会議種別:口頭発表(一般)  

    開催地:北海道大学函館キャンパス   国名:日本国  

  • 遅延蛍光エキサイプレックスのエネルギーギャップエンジニアリング

    安達 千波矢, 合志 憲一, 平山 雄太

    第74回応用物理学会秋季学術講演会  2013年9月 

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    会議種別:口頭発表(一般)  

    開催地:同志社大学 京田辺キャンパス   国名:日本国  

  • 有機半導体レーザーデバイスの実現に向けたASE発振閾値の低減及び高電流密度下におけるRoll-off抑制の両立

    安達 千波矢, 合志 憲一, 野村 洸子, 遠藤 晋旦, 井上 棟智

    有機EL討論会  2013年6月 

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    開催地:東京都(日本科学未来館)   国名:日本国  

  • 高生産性有機ELデバイス製造を目指したエレクトロスプレー成膜プロセスに関する研究

    安達 千波矢, 宮﨑 浩, 小石川 靖, 黒河 周平

    有機EL討論会第17回例会  2013年11月 

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    開催地:新潟コンベンションセンター   国名:日本国  

  • High-Performance Field-Effect Transistors Based on Organic Single-Crystal Microribbons/Microsheets of Thienoacene Derivatives

    安達 千波矢, 安田 琢麿, YANG YUSEOK

    高分子学会 2013  2013年6月 

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    会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:京都府京都市   国名:日本国  

  • High-Performance Field-Effect Transistors Based on Organic Single-Crystal Microribbons/Microsheets of Thienoacene Derivatives

    安達 千波矢, 安田 琢麿, YANG YUSEOK

    高分子学会 2013  2013年6月 

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    会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:京都府京都市   国名:日本国  

  • シクロトリホスファゼン骨格を有するホスト材料の合成と評価

    安達 千波矢, 安田 琢麿, 西本 琢朗

    有機EL討論会  2013年6月 

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    開催地:東京都(日本科学未来館)   国名:日本国  

  • Development of oxadiazole- and triazole-based highly-efficient thermally-activated delayed-fluorescence (TADF) emitters 国際会議

    安達 千波矢, 李 ジヨン, 安田 琢麿, 志津 功將, 田中 啓之, 野村 洸子

    第21 回日本化学会九州支部・韓国釜山合同セミナー  2013年6月 

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    開催地:韓国釜山 釜慶大学   国名:大韓民国  

  • 熱活性型遅延蛍光材料を用いた有機EL素子における高電流密度下での外部量子効率低下の抑制と要因解析

    安達 千波矢, 樋口 貴史, 宮﨑 浩, 中野谷 一

    有機EL討論会  2013年6月 

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    開催地:東京都(日本科学未来館)   国名:日本国  

  • 回転マグネットスパッタによるAl陰極形成技術

    安達 千波矢, 江面 知彦

    有機EL討論会第17回例会  2013年11月 

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    開催地:新潟コンベンションセンター   国名:日本国  

  • 熱活性型遅延蛍光材料を用いた電気化学発光

    安達 千波矢, 石松 亮一, 中野 幸二, 今任 稔彦

    第59回ポーラログラフィーおよび電気分析化学討論会  2013年11月 

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    開催地:石垣市民会館   国名:日本国  

  • ガスフロー蒸着法により成膜した共蒸着発光層の特性

    安達 千波矢, 継田 浩平, 江面 知彦

    有機EL討論会第17回例会  2013年11月 

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    開催地:新潟コンベンションセンター   国名:日本国  

  • 第三世代有機EL発光材料の展開 -熱活性化遅延蛍光材料からレーザーまで- 招待

    安達千波矢

    第38回光化学若手の会  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • TADFの最新技術と展望 招待

    安達千波矢

    ファインテックジャパン  2017年4月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “有機半導体レーザーの構築とデバイス物理の解明”

    安達千波矢

    日本学術振興会 「電子系の新しい機能」2006年度第2回研究会  2006年10月 

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    会議種別:口頭発表(一般)  

    開催地:けいはんな国際高等研究所   国名:日本国  

  • Ir系リン光材料の分子間相互作用-高性能有機ELデバイスの構築を目指して-

    安達千波矢

    九州大学理学部,第5回化学・材料研究セミナー「物質変換と分子計測」  2006年6月 

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    会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:九大理学部大会議室   国名:日本国  

  • “ディスプレーに役立つ分子たち”

    安達千波矢

    分子科学研究会「分子科学のフロンティア領域へ」  2006年6月 

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    会議種別:口頭発表(一般)  

    開催地:自然科学研究機構 岡崎コンファレンスセンター、岡崎   国名:日本国  

  • 高効率有機発光デバイスの到達点と新展開

    安達千波矢

    日本学術振興会,未踏・ナノデバイステクノロジー第151委員会第76回研究会—ナノデバイス・材料—  2006年5月 

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    会議種別:口頭発表(一般)  

    開催地:東京大学本郷キャンパス   国名:日本国  

  • 低電圧駆動を目指した低分子有機EL素子-高効率電子注入・輸送機構と材料開発-

    安達千波矢

    日本画像学会日本画像学会編集委員会 第9回 フリートーキング ”Imaging Today”, 「有機半導体材料の光電物性―有機ELの材料と将来動向」  2006年4月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • 発光型有機 FET

    安達千波矢

    応用物理学会有機分子・バイオエレクトロニクス分科会研究会「有機デバイスの新展開:有機トランジスタと有機ELの融合」  2006年3月 

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    会議種別:口頭発表(一般)  

    開催地:発明会館ホール   国名:日本国  

  • “有機発光デバイスの新展開−有機LED、発光性トランジスター、有機レーザー−”

    安達千波矢

    第54回高分子討論会  2005年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “有機発光デバイスの基礎から応用デバイスへの新展開”

    安達千波矢

    2005年国際固体素子・材料コンファレンスショートコース  2005年9月 

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    会議種別:口頭発表(一般)  

    開催地:神戸国際会議場   国名:日本国  

  • “りん光有機EL素子の現状”

    安達千波矢

    有機エレクトロニクスシンポジウム in 米沢  2005年9月 

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    会議種別:口頭発表(一般)  

    開催地:グランドホクヨウ米沢   国名:日本国  

  • “有機レーザーデバイス実現を目指した材料・デバイス設計”

    安達千波矢

    京大COEシンポジウム  2005年7月 

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    会議種別:シンポジウム・ワークショップ パネル(公募)  

    開催地:京大会館   国名:日本国  

  • “ディスプレイの最新動向”

    安達千波矢

    InterOpto ’05,光技術動向セミナー  2005年7月 

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    会議種別:口頭発表(一般)  

    開催地:幕張メッセ   国名:日本国  

  • “有機レーザーデバイス実現を目指した材料・デバイス設計”

    安達千波矢

    京都大学21世紀COEシンポジウム  2005年7月 

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    会議種別:口頭発表(一般)  

    開催地:京大会館   国名:日本国  

  • “有機半導体発光デバイスの到達点と新展開”

    安達千波矢

    第22回 フォトポリマーコンファレンス(CPST-22)  2005年6月 

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    会議種別:口頭発表(一般)  

    開催地:千葉大学   国名:日本国  

  • “Recent progress on OLED”

    安達千波矢

    理研ナノサイエンス&ナノテクノロジーセミナー  2005年4月 

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    会議種別:口頭発表(一般)  

    開催地:理化学研究所   国名:日本国  

  • “有機EL素子の高性能化への挑戦”

    安達千波矢

    近畿化学協会・機能性色素部会第61回例会  2005年4月 

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    会議種別:口頭発表(一般)  

    開催地:大阪科学技術センター   国名:日本国  

  • “有機半導体から見たDNAの電子伝導性と電子デバイスへの応用”

    安達千波矢

    DNAワークショップ プログラム,ナノテクノロジー分野別バーチャルラボ領域横断企画,JST ワークショップ  2005年3月 

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    会議種別:口頭発表(一般)  

    開催地:熱海   国名:日本国  

  • “有機半導体レーザダイオードの研究開発の最前線”

    安達千波矢

    ワイドギャップ半導体光・電子デバイス第162委員会学振162委員会  2005年3月 

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    会議種別:口頭発表(一般)  

    開催地:上智大学,四谷   国名:日本国  

  • “Recent progress on OLED” 国際会議

    安達千波矢

    Department of Materials Science Seminar  2005年3月 

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    会議種別:口頭発表(一般)  

    開催地:Seoul National Univ., Seoul   国名:大韓民国  

  • “Mechanism of high efficiency electrophosphorescence” 国際会議

    安達千波矢

    TAC-Display Meeting  2005年2月 

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    会議種別:口頭発表(一般)  

    開催地:台湾工業技術院(ITRI)、新竹   国名:台湾  

  • “有機半導体発光デバイスの到達点と新展開”

    安達千波矢

    東北大学  2005年1月 

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    会議種別:口頭発表(一般)  

    開催地:東北大学 金属材料研究所   国名:日本国  

  • “有機発光デバイスの到達点と新展開”

    安達千波矢

    未来産業を支える高分子材料,第8回日本海ポリマーワークショップ,高分子学会北陸支部  2004年12月 

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    会議種別:口頭発表(一般)  

    開催地:新潟県工業技術試験場   国名:日本国  

  • “有機固体薄膜における電流励起過程と励起子失活過程”

    安達千波矢

    2004 (H16) 京都大学VBL先端電子材料学講義  2004年12月 

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    会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:京都大学桂キャンパス・電気系第一講義室 A1-001   国名:日本国  

  • “有機ELの作動機構”

    安達千波矢

    高分子学会有機EL研究会  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:タワーホール船堀,千葉   国名:日本国  

  • “有機リン光素子の現状と課題”

    安達千波矢

    SEMI FPD Expo Japan 2004  2004年7月 

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    会議種別:口頭発表(一般)  

    開催地:東京ビッグサイト、東京   国名:日本国  

  • “電流励起を目指した有機半導体レーザーの材料デバイス設計”

    安達千波矢

    日本学術振興会第142委員会C部会有機光エレクトロニクス部会第2回研究会(M&BE研究会)  2004年7月 

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    会議種別:口頭発表(一般)  

    開催地:東工大・国際交流会館   国名:日本国  

  • “有機リン光デバイス”

    安達千波矢

    プラスチック・エレクトロニクスの新展開研究会  2004年7月 

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    会議種別:口頭発表(一般)  

    開催地:東大生産技術研究所   国名:日本国  

  • “有機ELの基礎、デバイス物理、展望”(Tutorialセッション)

    安達千波矢

    SEMI FPD Expo Japan 2004  2004年4月 

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    会議種別:口頭発表(一般)  

    開催地:東京ビッグサイト、東京   国名:日本国  

  • “有機ELのデバイス基礎物理過程−有機半導体デバイス物理の確立に向けて”

    安達千波矢

    情報科学用有機材料第142委員会B(インテリジェント有機材料)研究会  2004年3月 

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    会議種別:口頭発表(一般)  

    開催地:弘済会館、東京   国名:日本国  

  • “有機金属リン光材料のPL及びEL過程”

    安達千波矢

    応用物理学会 有機分子バイオエレクトロニクス分科会  2004年3月 

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    会議種別:口頭発表(一般)  

    開催地:機械振興会館、東京   国名:日本国  

  • “有機金属リン光OLEDと光物性過程の解明”

    安達千波矢

    名古屋大学  2004年3月 

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    会議種別:口頭発表(一般)  

    開催地:名古屋大学   国名:日本国  

  • “有機半導体レーザーの構築とデバイス物理の解明”

    安達千波矢

    科学技術振興機構 ナノテクノロジー分野別バーチャルラボ発表会  2004年2月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:日本科学未来館、東京   国名:日本国  

  • “有機エレクトロニクスの展開”

    安達千波矢

    千歳オフィス・アルカディア企業誘致推進協議会 光セミナーin東京2003  2003年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:地域振興整備公団本部、東京   国名:日本国  

  • “新しいプラスチックエレクトロニクスの登場”

    安達千波矢

    日本化学会北海道支部 夢・化学−21委員会 特別講義Ⅰ  2003年8月 

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    会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:千歳科学技術大学   国名:日本国  

  • “有機リン光デバイスの到達点と今後の課題”

    安達千波矢

    ファインテック・ジャパン専門技術セミナー  2003年7月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京ビックサイト,東京   国名:日本国  

  • “リン光性有機EL材料の光化学過程”

    安達千波矢

    (財)光産業技術振興協会 高効率有機デバイス推進機構 第1回補完研究講演会  2003年7月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • “自己組織化とフォトニクスデバイス”

    安達千波矢

    ジョイントフォラム「自己組織化とは何か−ナノテクノロジーを支えるもの−」物質材料研究機構ナノテクノロジー総合支援プロジェクトセンター  2003年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:ニドム、苫小牧   国名:日本国  

  • “有機リン光デバイスの発光メカニズムと展望”

    安達千波矢

    応用物理学会有機分子・バイオエレクトロニクス分科会研究会  2003年3月 

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    会議種別:口頭発表(一般)  

    開催地:全共連ビル、東京   国名:日本国  

  • “高効率有機LEDの光物理過程”

    安達千波矢

    印刷・情報記録・表示研究会講座(高分子学会)  2003年2月 

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    会議種別:口頭発表(一般)  

    開催地:化学会館ホール、東京   国名:日本国  

  • “有機エレクトロニクスの新展開”

    安達千波矢

    第2回光ベンチャーセミナー((財)光産業技術振興協会)  2002年12月 

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    会議種別:口頭発表(一般)  

    開催地:地域振興整備公団、東京   国名:日本国  

  • “発光効率を飛躍的に高める有機ELのりん光材料技術”

    安達千波矢

    (財)長野県テクノ財団 知的クラスター講演会  2002年12月 

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    会議種別:口頭発表(一般)  

    開催地:信州大学、上田   国名:日本国  

  • “高効率有機LEDの実現から有機レーザーダイオードへの展開” 招待

    安達千波矢

    文部科学省分子シンクロ材料シンポジウム  2002年11月 

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    会議種別:口頭発表(一般)  

    開催地:千里ライフサイエンスセンター、大阪   国名:日本国  

  • “有機EL材料”

    安達千波矢

    第23回 表面科学セミナー  2002年10月 

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    開催地:駿河台記念館、東京   国名:日本国  

  • “内部量子効率100%に迫る高効率有機LEDの到達点と今後の展開” 国際会議

    安達千波矢

    LCD/PDP International 2002  2002年10月 

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    会議種別:口頭発表(一般)  

    開催地:パシフィコ横浜   国名:日本国  

  • “発光効率を飛躍的に高める有機ELのリン光材料技術” 国際会議

    安達千波矢

    LCD/PDP International 2002  2002年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:パシフィコ横浜   国名:日本国  

  • “高性能有機光半導体材料の登場とマイクロデバイス化への展開 「ナノテクノロジー・ナノサイエンス概論工」”

    安達千波矢

    北海道大学大学院共通講義  2002年8月 

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    会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:北海道大学   国名:日本国  

  • “有機固体レーザー”

    安達千波矢

    有機半導体講習会  2002年8月 

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    開催地:アジュール竹芝 東京   国名:日本国  

  • “有機電荷移動媒体を用いたスイッチング素子”

    安達千波矢

    近畿化学協会 機能性色素部会 第54回例会 有機トランジスタ  2002年7月 

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    会議種別:口頭発表(一般)  

    開催地:キャンパスプラザ京都   国名:日本国  

  • “有機EL リン光発光材料を用いた高効率低分子有機薄膜EL素子”

    安達千波矢

    照明学会研究会  2002年5月 

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    会議種別:口頭発表(一般)  

    開催地:明治大学   国名:日本国  

  • “有機りん光発光素子のデバイス物理”

    安達千波矢

    応用物理学会有機分子・バイオエレクトロニクス分科会研究会  2002年3月 

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    会議種別:口頭発表(一般)  

    開催地:理化学研究所   国名:日本国  

  • “有機リン光発光デバイスの到達点とこれからの課題”

    安達千波矢

    有機エレクトロニクス研究会  2002年3月 

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    会議種別:口頭発表(一般)  

    開催地:科学技術交流財団   国名:日本国  

  • “発光量子収率100%に迫る有機発光ダイオードのデバイス物理”

    安達千波矢

    ナノDNAセミナー  2002年1月 

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    会議種別:口頭発表(一般)  

    開催地:筑波・物質材料研究機構   国名:日本国  

  • “内部量子効率100%に達する有機りん光素子の発光機構”

    安達千波矢

    第136回 フォトポリマー懇話会・第123回有機エレクトロニクス研究会 合同講演会  2001年12月 

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    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • “有機EL材料の現状と傾向”

    安達千波矢

    第290回 蛍光体同学会講演会  2001年11月 

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    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 有機半導体レーザー実現を目指した材料・デバイス設計 招待

    安達千波矢,中野谷一,松島敏則,八尋正幸

    レーザー学会学術講演会第27回年次大会  2007年1月 

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    会議種別:口頭発表(一般)  

    開催地:宮崎市フェニックスシーガイヤリゾート   国名:日本国  

  • 有機発光デバイスの新展開-有機発光性トランジスターの登場-

    安達千波矢,八尋正幸,坂上知,内生蔵広幸

    2006年度日本液晶学会討論会  2006年9月 

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    会議種別:口頭発表(一般)  

    開催地:秋田大学   国名:日本国  

  • “有機ELデバイスの超高電流密度の実現と特異な光電子物性の発現”

    安達千波矢,松島敏則

    科研費 学術創成研究(有機デバイス関連界面の解明と制御)  2006年10月 

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    会議種別:口頭発表(一般)  

    開催地:名古屋大学   国名:日本国  

  • “積層型有機太陽電池における短絡電流の支配因子の解明”

    寺尾佑生,雀部博之,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

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    会議種別:口頭発表(一般)  

    開催地:武蔵工大   国名:日本国  

  • “有機LEDにおけるCs合金の高効率電子注入機構の解明”

    小山田崇人、前田千春、雀部博之、安達千波矢

    第64回応用物理学会学術講演会  2003年8月 

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    会議種別:口頭発表(一般)  

    開催地:福岡大学   国名:日本国  

  • “低仕事関数金属による有機LEDのOLED特性と厚膜デバイス”

    小山田崇人、前田千春、雀部博之、安達千波矢

    第50回応用物理学会関係連合講演会  2003年3月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “新規電子注入材料による透明有機LEDの電子注入特性”

    小山田崇人、前田千春、吉崎浩樹、雀部博之、安達千波矢

    第50回応用物理学会関係連合講演会  2003年3月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “CsAl電極の高効率電子注入特性”

    小山田崇人、安達千波矢

    CIF4サテライトフォーラム 有機半導体デバイスの基礎物理  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:ニドム、苫小牧   国名:日本国  

  • “陽極とCu:TCNQ間に有機層を含有する有機スイッチングデバイス”

    小山田崇人、松重和美、雀部博之、安達千波矢

    第50回応用物理学会関係連合講演会  2003年3月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “共蒸着法によるEu(DPM)3:BCPキレート錯体の形成と有機LED”

    小山田崇人、河村祐一郎、小山珠美、雀部博之、安達千波矢

    第64回応用物理学会学術講演会  2003年8月 

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    会議種別:口頭発表(一般)  

    開催地:福岡大学   国名:日本国  

  • “酸化膜上のCu:TCNQ 共蒸着膜による有機スイッチングデバイス”

    小山田崇人、田中治夫、雀部博之、安達千波矢

    第63回応用物理学会学術講演会  2002年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “MgAu合金による電子注入特性と特異な安定性”

    小山田崇人、雀部博之、安達千波矢

    第64回応用物理学会学術講演会  2003年8月 

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    会議種別:口頭発表(一般)  

    開催地:福岡大学   国名:日本国  

  • “9,9-diarylfluoreneオリゴマーの光学特性と発光デバイスへの応用”,第67回応用物理学会学術講演会

    小山田崇人,C-H Chang,C. C. Wu,T-C. Chao,F-C. Fang,K-T Wong,安達千波矢

    第67回応用物理学会学術講演会  2006年8月 

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    会議種別:口頭発表(一般)  

    開催地:立命館大学   国名:日本国  

  • “α-NPD/Alq3素子における電界消光現象”

    小山田崇人,佐藤祐,雀部博之,安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “活性層にピレン誘導体を用いた有機発光型トランジスターの作動機構”

    小山田崇人,内生蔵広幸,秋山誠治,奥良彰,下地規之,松重和美,雀部博之,安達千波矢

    第54回高分子討論会  2005年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “Rubrene:TPPy 共蒸着膜を用いた有機発光型トランジスター(Ⅰ) チャネル長依存性”

    小山田崇人,内生蔵広幸,奥良彰,下地規之,松重和美,雀部博之,安達千波矢

    第52回応用物理学関係連合講演会  2005年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:埼玉大   国名:日本国  

  • “Rubrene:TPPy 共蒸着膜を用いた有機発光型トランジスター(Ⅱ) S-D 電極依存性”

    小山田崇人,内生蔵広幸,奥良彰,下地規之,松重和美,雀部博之,安達千波矢

    第52回応用物理学関係連合講演会  2005年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:埼玉大   国名:日本国  

  • “活性層にTPTPTを用いた発光型トランジスターの実現とチャネル長依存性”

    小山田崇人,内生蔵広幸,奥山優,下地規之,松重和美,雀部博之,安達千波矢

    第65回応用物理学会学術講演会  2004年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東北学院大   国名:日本国  

  • “局所ドーピング法による有機発光型トランジスターのEL発光機構の解明”

    小山田崇人,奥 良彰,下地規之,秋山誠治,松重和美,雀部博之,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

     詳細を見る

    会議種別:口頭発表(招待・特別)  

    開催地:武蔵工大   国名:日本国  

  • “有機発光型トランジスターにおけるキャリア再結合サイトの特定とゲート電圧よる励起子消滅”

    小山田崇人,奥 良彰,下地規之,秋山誠治,松重和美,雀部博之,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:武蔵工大   国名:日本国  

  • “局所ドーピング法による有機発光型トランジスターのEL発光及びキャリア再結合サイトの解析”

    小山田崇人,奥良彰,下地規之,秋山誠治,松重和美,雀部博之,安達千波矢

    第66回応用物理学会学術講演会  2005年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:徳島大学   国名:日本国  

  • “有機発光トランジスタの特性”,

    小山田崇人,安達千波矢

    有機エレクトロニクスシンポジウム in 米沢  2005年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:グランドホクヨウ米沢   国名:日本国  

  • “有機LEDにおける厚膜HTLのホール輸送機構”

    小山田崇人,平山泰生,雀部博之,安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “Cs:電子輸送性化合物共蒸着膜を電子注入層に用いた有機LEDの低電圧駆動化(J~100mA/cm2 at V=4V)”

    小山田崇人,村瀬清一郎,富永剛,前田千春,雀部博之,安達千波矢

    第65回応用物理学会学術講演会  2004年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東北学院大   国名:日本国  

  • “Cu:TCNQ共蒸着膜による有機スイッチングデバイス”

    小山田崇人,田中治夫,雀部博之,安達千波矢

    電気学会 電子・情報・システム部門大会  2002年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “真空蒸着法によるCu-TCNQ錯体薄膜の形成と有機スイッチング素子”

    小山田崇人,田中春夫,雀部博之,安達千波矢

    第49回応用物理学会関係連合講演会  2002年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東海大学・湘南校舎   国名:日本国  

  • “TPPy蒸着膜の薄膜凝集状態と粉末結晶状態の相関”

    小山田崇人,秋山誠治,屋代恒,雀部博之,安達千波矢

    第66回応用物理学会学術講演会  2005年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:徳島大   国名:日本国  

  • “a-NPD/Alq3素子の電界消光現象とEL効率との相関”

    小山田崇人,雀部博之,安達千波矢

    第53回高分子討論会  2004年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “Alq3蒸着膜の光物性”

    山内大樹、合志憲一、雀部博之、安達千波矢

    第63回応用物理学会学術講演会  2002年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “特殊Conical 型Target を用いた有機EL 用低ダメージITO スパッタ製膜”

    山本英利, 小山田崇人, 青島正一, 雀部博之, 安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “高熱伝導率基板を用いた有機薄膜への最大電流密度〜12000A/cm2 の実現”

    山本英利, 笠嶋大樹, 横山亘, 脇本健夫, 雀部博之, 安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “光導波路型有機半導体レーザーの陰極構造の最適化” 招待

    山本英利、小山田崇人、雀部博之、安達千波矢

    第50回応用物理学会関係連合講演会  2003年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “ビススチルベンゼン誘導体のASE特性の温度依存性”

    山本英利、河村祐一郎、雀部博之、安達千波矢

    第64回応用物理学会学術講演会  2003年8月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡大学   国名:日本国  

  • “DNA-CTMAの導電性とOLED特性”

    平田邦雄、小山田崇人、小山珠美、今井敏郎、雀部博之、安達千波矢

    日本化学会第84春季年会  2004年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “DNA ポリイオンコンプレックスの電子輸送特性と電界発光素子への応用”

    平田邦雄、小山珠美、小山田崇人、安達千波矢

    第47回高分子討論会  2002年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “光電変換デバイスにおける機能性錯体の応用例と今後の可能性”

    新美達也,安達千波矢

    第85回日本化学会春季年会  2005年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • DPh-BDS/C60積層膜による高移動度ambipolar FET特性

    木下昇平,八尋正幸,池田征明,桑原博一,瀧宮和男,江端英昭,安達千波矢

    第54回応用物理学関係連合講演会  2007年3月 

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    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • 超低駆動電圧有機LED実現のための材料・デバイス設計 招待

    松島敏則, 安達千波矢

    高分子学会06-2有機EL研究会  2006年12月 

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    会議種別:口頭発表(一般)  

    開催地:発明会館ホール   国名:日本国  

  • 電流励起型有機レーザ素子を目指したp-i-n構造を用いた超低電圧駆動有機EL素子

    松島敏則, 安達千波矢

    第3回有機EL討論会  2006年11月 

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    会議種別:口頭発表(一般)  

    開催地:つくば国際会議場多目的ホール   国名:日本国  

  • “a-6T正孔注入層とCs:PoPy2電子注入層を用いた超低駆動電圧有機EL素子”

    松島敏則,安達千波矢

    第67回応用物理学会学術講演会  2006年8月 

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    会議種別:口頭発表(一般)  

    開催地:立命館大学   国名:日本国  

  • “有機/有機ヘテロ接合界面におけるキャリア注入機構”

    松島敏則,安達千波矢

    第67回応用物理学会学術講演会  2006年8月 

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    会議種別:口頭発表(一般)  

    開催地:立命館大学   国名:日本国  

  • “低電流密度から高電流密度域におけるCuPc薄膜素子のキャリア伝導機構”

    松島敏則,雀部博之,安達千波矢

    第67回応用物理学会学術講演会  2006年8月 

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    会議種別:口頭発表(招待・特別)  

    開催地:立命館大学   国名:日本国  

  • “1um2以下の素子面積を有するCuPc薄膜素子のキャリア伝導機構”

    松島敏則,雀部博之,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

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    会議種別:口頭発表(一般)  

    開催地:武蔵工大   国名:日本国  

  • “有機薄膜における電流密度-電圧特性の特異な温度依存性”

    松島敏則,雀部博之,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:武蔵工大   国名:日本国  

  • “フォトリソグラフィを用いた超微小有機ダイオードの作製と超高電流密度(JMAX=18,000A/cm2)の実現”

    松島敏則,雀部博之,安達千波矢

    第66回応用物理学会学術講演会  2005年9月 

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    会議種別:口頭発表(一般)  

    開催地:徳島大   国名:日本国  

  • アリールアミン系正孔輸送材料とAlq3のExciplex形成及び電界消光現象の解析

    松本直樹,西山正一,高橋満,安達千波矢

    第54回応用物理学関係連合講演会  2007年3月 

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    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • “フルオレン系正孔輸送材料とAlq3との相互作用の解明”

    松本直樹,西山正一,安達千波矢

    第67回応用物理学会学術講演会  2006年8月 

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    会議種別:口頭発表(一般)  

    開催地:立命館大学   国名:日本国  

  • 有機ELディスプレイの基礎

    松波 成行, 安達 千波矢

    電気情報通信学会  2012年9月 

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    開催地:富山県富山市   国名:日本国  

  • “蛍光材料を用いたOLEDの量子効率の電流密度依存性”

    横山亘、小山田崇人、合志憲一、雀部博之、安達千波矢

    第50回応用物理学会関係連合講演会  2003年3月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “有機半導体薄膜における高電流密度(J〜1000A/㎝2)の実現”

    横山亘、雀部博之、安達千波矢

    第50回応用物理学会関係連合講演会  2003年3月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “蛍光材料による高電流密度下でのEL量子効率低下現象”

    横山亘、雀部博之、安達千波矢

    第63回応用物理学会学術講演会  2002年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • 有機アモルファス膜内における分子配向と端面カットオフ発光の光増幅特性

    横山大輔、 安達千波矢

    2008年春季第55回応用物理学関連講演会  2008年3月 

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    開催地:日本大学理工学部 船橋キャンパス   国名:日本国  

  • 有機EL素子端面からのカットオフ波長における狭帯域発光

    横山大輔、 安達千波矢

    有機EL討論会第5例会  2007年11月 

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    国名:日本国  

  • カットオフモードに起因する有機膜端面からの狭帯域発光(1):光学現象と理論解析

    横山大輔、安達千波矢

    2007年秋季第68回応用物理学会学術講演会  2007年9月 

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    開催地:北海道工業大学   国名:日本国  

  • “新規リン光材料のキャリア輸送性と再結合過程の制御” 招待

    河崎拓也,遠藤礼隆,Jason Brooks,Julie J. Brown,雀部博之,安達千波矢

    第66回応用物理学会学術講演会  2005年9月 

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    会議種別:口頭発表(一般)  

    開催地:徳島大   国名:日本国  

  • “イリジウム錯体を用いた有機発光ダイオード”

    河村祐一郎

    錯体化学研究会 錯体化学の挑戦 - Challenges for Coordination Chemistry & Science-  2004年3月 

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    会議種別:口頭発表(一般)  

    開催地:岡崎、愛知   国名:日本国  

  • “Ir錯体の吸収・誘導放出断面積と増幅自然放出活性”

    河村祐一郎, Jason Brooks, Julie J. Brown, 鈴木健吾, 雀部博之, 安達千波矢

    第52回応用物理学関係連合講演会  2005年3月 

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    会議種別:口頭発表(一般)  

    開催地:埼玉大学   国名:日本国  

  • “CBP共蒸着膜中におけるIr錯体の発光効率と分子間相互作用”

    河村祐一郎、Jason Brooks、Julie J. Brown、雀部博之、安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

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    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “高強度励起下におけるIr(ppy)3:CBP共蒸着膜の光物性”

    河村祐一郎、合志憲一、雀部博之、安達千波矢

    第64回応用物理学会学術講演会  2003年8月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡大学   国名:日本国  

  • “リン光材料の発光効率と励起状態失活過程”

    河村祐一郎、安達千波矢

    CIF4サテライトフォーラム 有機半導体デバイスの基礎物理  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:ニドム、苫小牧   国名:日本国  

  • “有機半導体薄膜からの紫外ASE”

    河村祐一郎、山本英利、雀部博之、安達千波矢

    第64回応用物理学会学術講演会  2003年8月 

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    会議種別:口頭発表(一般)  

    開催地:福岡大学   国名:日本国  

  • “アリールアミン系材料におけるASE支配因子の探索”

    河村祐一郎、雀部博之、安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

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    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “リン光性イリジウム錯体の発光効率と濃度消光過程”

    河村祐一郎,今田直人,Jason Brooks, Julie J. Brown, 雀部博之,安達千波矢

    第53回高分子討論会  2004年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “リン光材料-光物理過程と有機LEDへの応用-”

    河村祐一郎,合志憲一,Jason Brooks,Julie J. Brown,雀部博之,安達千波矢

    第85回日本化学会春季年会  2005年3月 

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    会議種別:口頭発表(一般)  

    開催地:神奈川大学   国名:日本国  

  • “イリジウム錯体とホスト材料の相互作用”

    河村祐一郎,安達千波矢

    日本学術振興会第142委員会C部会有機光エレクトロニクス部会第1回研究会  2004年6月 

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    会議種別:口頭発表(一般)  

    開催地:日本科学未来館   国名:日本国  

  • “超薄膜領域における有機TFTの素子特性”

    油川祐基、小山田崇人、雀部博之、安達千波矢

    第50回応用物理学会関係連合講演会  2003年3月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • 単層型OLEDの高電流密度下におけるRoll-Off特性の改善

    瀬戸口陽介,中野谷一,秋山誠治,安達千波矢

    第54回応用物理学関係連合講演会  2007年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • “トリアジン誘導体のキャリア輸送特性”

    猪俣寛子、合志憲一、増子琢磨、木村明博、金野徹、今井敏郎、雀部博之、Julie J. Brown、安達千波矢

    日本化学会第84春季年会  2004年3月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “トリアジン系新規電子輸送性材料を用いた有機リン光素子”

    猪股寛子、増子拓磨、金野徹、今井敏郎、安達千波矢

    第63回応用物理学会学術講演会  2002年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • フェノキサジンをドナーとして有する高効率緑色熱活性化型遅延蛍光(TADF)材料の開発

    田中 啓之, 志津 功將, 宮﨑 浩, 安達 千波矢

    有機EL討論会第15回例会  2012年11月 

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    開催地:島根県松江市   国名:日本国  

  • ピレンとその誘導体の電気化学発光

    田代修也,○石松亮一,安達千波矢,中野幸二,今任稔彦

    電気化学会第84回大会  2017年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Tokyo   国名:日本国  

  • “FIrpic:CBP薄膜におけるエネルギー移動機構”

    白戸雅裕,合志憲一,J. J. Brown,雀部博之,安達千波矢

    第49回応用物理学会関係連合講演会  2002年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東海大学・湘南校舎   国名:日本国  

  • 有機EL素子用発光材料による電気化学発光のフロー分析の応用

    石松 亮一, 安達 千波矢

    分析化学第61階年会  2012年9月 

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    開催地:滋賀県草津市   国名:日本国  

  • “有機LED素子構造を用いた高電流密度(300~A/cm2)の実現と律速過程”

    笠島大樹、山本英利,雀部博之,安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “N,N’-ビスアリールカルバゾール誘導体をホストとする有機リン光EL素子の発光特性”

    笠嶋大樹,猪俣寛子,吉崎浩樹,雀部博之,安達千波矢

    第53回高分子討論会  2004年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “チャネル長依存性による有機TFTの内部抵抗の検証”

    菅沼直俊、下地規之,松重和美,雀部博之,安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “OTFT-OLED複合型新規発光素子の作製”

    菅沼直俊,八尋正幸,下地規之,土田正美,安達千波矢,松重和美

    第65回応用物理学会学術講演会  2004年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東北学院大   国名:日本国  

  • “共蒸着型および積層型ambipolar有機TFTの基礎特性”

    菅沼直俊,平田邦雄,小山田崇人,松重和美,雀部博之,安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “高速移動度を目指したポリジアセチレン薄膜のトランジスター特性”

    西出順一,小山田崇人,秋山誠治,雀部博之,安達千波矢

    第66回応用物理学会学術講演会  2005年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:徳島大   国名:日本国  

  • “アセチレン連結フェニルカルバゾール誘導体のPL及びOLED特性”

    遠藤礼隆,中野谷一,角谷公宏,雀部博之,大北雅一,安達千波矢

    第52回応用物理学関係連合講演会  2005年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:埼玉大学   国名:日本国  

  • “Ir錯体をホスト‐ゲスト材料として用いた固体薄膜の光物性”

    遠藤礼隆,合志憲一,鈴木健吾,雀部博之,安達千波矢

    第67回応用物理学会学術講演会  2006年8月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:立命館大学   国名:日本国  

  • “環状シロキサン化合物を用いた高効率有機リン光LED素子”

    遠藤礼隆,小山田崇人,河村祐一郎,Jason Brooks, Julie J. Brown, 雀部博之,安達千波矢

    第65回応用物理学会学術講演会  2004年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東北学院大   国名:日本国  

  • “ピリジン誘導体をホスト材料とする高効率有機リン光LED素子”

    遠藤礼隆,岩澤哲郎,徳永信,大洞康嗣,雀部博之,辻康之,安達千波矢

    第52回応用物理学関係連合講演会  2005年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:埼玉大学   国名:日本国  

  • Ir錯体の絶対PL量子収率測定及び光物性

    遠藤礼隆,鈴木健吾,吉原利忠,飛田成史,雀部博之,安達千波矢

    2006年日本化学会西日本大会  2006年11月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:琉球大学   国名:日本国  

  • “溶液中におけるIr錯体の絶対PL量子収率測定及び光物性”

    遠藤礼隆,鈴木健吾,吉原利忠,飛田成史,雀部博之,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:武蔵工大   国名:日本国  

  • “厚膜有機EL素子用HTMの開発とガラス転移温度との相関”

    青沼昌樹,小山田崇人,三木鉄蔵,雀部博之,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:武蔵工大   国名:日本国  

  • 両極性テトラセン単結晶トランジスタの発光特性

    高橋哲生,竹延大志,木下昇平,八尋正幸,安達千波矢,岩佐義宏

    第54回応用物理学会関係連合講演会  2007年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • “Alq3単結晶の光物性”

    高橋教悦、合志憲一、雀部博之、安達千波矢

    第64回応用物理学会学術講演会  2003年8月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡大学   国名:日本国  

  • “様々なIr金属錯体ホスト中におけるAlq3の燐光PL・EL特性” 招待

    高橋教悦,合志憲一,Jason Brooks,Julie J. Brown,河村祐一郎,雀部博之,安達千波矢

    第52回応用物理学関係連合講演会  2005年3月 

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    会議種別:口頭発表(一般)  

    開催地:埼玉大学   国名:日本国  

  • “CuPcをホール注入層に用いたOLEDの特異な膜厚依存性”

    吉田昌史,雀部博之, 安達千波矢

    第52回応用物理学関係連合講演会  2005年3月 

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    会議種別:口頭発表(一般)  

    開催地:埼玉大学   国名:日本国  

  • “White Electrophosphorescent Devices having Multi-Phosphors Doped Layers” 国際会議

    N. Ando, Y. Kawamura, J. J. Brown, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Photoluminescence characteristics of novel blue and red phosphorescence materials” 国際会議

    N. Imada, Y. Kawamura, J. Brooks, J. J. Brown, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Exciplex Formation between Alq3 and Triarylamine Derivatives and Their Photoluminescence Characteristics” 国際会議

    N. Matsumoto, M. Nishiyama, M. Takahashi, C. Adachi

    The Fourth International Conference on Molecular Electronics and Bioelectronics (M&BE4)  2007年3月 

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    会議種別:口頭発表(一般)  

    開催地:Tokyo   国名:日本国  

  • “Exciton decay processes of Alq3 in different morphologies” 国際会議

    N. Takahashi, K. Goushi, Y. Kawamura, T. Suzuki, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Photophysics of Alq3 with Various Aggregated Morphologies” 国際会議

    N. Takahashi, K. Goushi, Y. Kawamura, T. Suzuki, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “ディウェティング現象による有機発光材料のマイクロパターニング”

    Olaf Karthaus, 小山田崇人,安達千波矢

    第53回高分子討論会  2004年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “TPDマイクロドームを用いた新型有機ELデバイスの作成”

    Olaf Karthaus,栗村茂也,小山田崇人,安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

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    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • Long-lived triplet excitons in organic materials 招待 国際会議

    Ryota Kabe, Naoto Notsuka, Hiroyuki Mieno, Kou Yoshida and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • “Photoluminescence Property of Soluble Tris (8-quinolinolate) aluminum-derived Dendrimers” 国際会議

    S. Furusake, S. Maruyama, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Molecular Design of Fluorescent Styrylbenzene Derivatives (SBD) Aiming for Low Threshold Amplified Spontaneous Emission” 国際会議

    T. Aimono, Y. Kawamura, H. Yamamoto, H. Sasabe, M. Satsuki and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • Extremely low-voltage organic light emitting diodes with p-doped a-sexithiophene hole transport and n-doped phenyldipyrenylphosphine oxide electron transport layers 国際会議

    T. Matsushima and C. Adachi

    Materials Research Society (MRS)  2007年4月 

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    会議種別:口頭発表(一般)  

    開催地:San Francisco, USA   国名:アメリカ合衆国  

  • “Injection of current density over MA/cm2 in organic thin film and investigation of carrier transport processes from nA/cm2 to MA/cm2” 国際会議

    T. Matsushima and C. Adachi

    SPIE International Symposium on Optics & Photonics  2006年8月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego   国名:アメリカ合衆国  

  • “Organic light-emitting field-effect transistors(OLEFETs) using a rubrene:TPPy co-deposited layer” 招待 国際会議

    T. Oyamada, H. Sasabe, and C. Adachi

    AM-LCD 95’  2005年7月 

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    会議種別:口頭発表(一般)  

    開催地:Kanazawa   国名:日本国  

  • “Correlation between Photoluminescence Quenching by Electrical Field and Electroluminescence Efficiency in a-NPD/Alq3 Devices” 国際会議

    T. Oyamada, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Formation of a MgAu Alloy Cathode by Photolithography and the Applications for Organic Light-Emitting Diodes and Organic Field-Effect transistors” 国際会議

    T. Oyamada, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Formation of a Cu:TCNQ CT-Complex Thin Film by Vacuum Co-deposition and the Switching Characteristics with Metal-Oxide Layers” 国際会議

    T. Oyamada, H. Tanaka, H. Sasabe and C. Adachi

    3rd Chitose International Forum on Photonics Science & Technology(CIST)  2002年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Organic light-emitting transistors using ambipolar FET characteristics” 招待 国際会議

    T. Oyamada, H. Uchiuzou, K. Matsushige, H. Sasabe and C. Adachi

    Material Research Society (MRS) 2004 Fall Meeting  2004年11月 

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    会議種別:口頭発表(一般)  

    開催地:Boston   国名:アメリカ合衆国  

  • “Electroluminescence of Tetraphenylpyrene in Organic Light-Emitting Field-Effect Transistors” 招待 国際会議

    T. Oyamada, S. Okuyama, N. Shimoji, K. Matsushige, H. Sasabe and C. Adachi

    The Fifth International Conference on Electroluminescence of Molecular Materials and Related Phenomena (ICEL-5)  2005年1月 

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    会議種別:口頭発表(一般)  

    開催地:Phoenix   国名:アメリカ合衆国  

  • “Carrier Transport Characteristics of DNA Poly-Ionic Complexes and The Organic Light-Emitting Diodes” 国際会議

    T. Oyamada, T. Koyama, K. Hirata and C. Adachi

    3rd Chitose International Forum on Photonics Science & Technology(CIST)  2002年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Formation of a Eu(DPM)3:BCP Chelate Complex by Vacuum Co-deposition and the Application for Organic Light-Emitting Diodes” 国際会議

    T. Oyamada, Y. Kawamura, T. Koyama, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Photophysics of Alq3 Thin Films” 国際会議

    T. Yamauchi, K. Goushi and C. Adachi

    3rd Chitose International Forum on Photonics Science & Technology(CIST)  2002年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:アメリカ合衆国  

  • Vacuum-and-solvent-free fabrication of organic semiconductor layers for field-effect transistors 招待 国際会議

    Toshinori Matsushima, Atula S. D. Sandanayaka, Yu Esaki and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • CW-amplified spontaneous emission from an organic solid-state film. 国際会議

    Toshinori Matsushima, Chihaya Adachi, and Hajime Nakanotani

    2006 MRS spring meeting  2006年4月 

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    会議種別:口頭発表(一般)  

    開催地:San Francisco   国名:アメリカ合衆国  

  • “Organic light emitting diodes at very high current density” 招待 国際会議

    W. Yokoyama, H. Sasabe and C. Adachi

    Second International Conference on Molecular Electronics and Bioelectronics (M&BE2)  2003年3月 

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    会議種別:口頭発表(一般)  

    開催地:Tokyo   国名:日本国  

  • “Decrease of EL Quantum Efficiency in Fluorescence Materials at High Current Density” 国際会議

    W. Yokoyama, H. Sasabe and C. Adachi

    3rd Chitose International Forum on Photonics Science & Technology (CIST)  2002年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Elucidation of Controlling Factor for ASE Threshold in Ultraviolet/deep Blue Emissive Organic Semiconductor Films” 国際会議

    Y. Kawamura, H. Yamamoto, K. Goushi, H. Yoshizaki, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “100% phosphorescence efficiency of Ir(III) complexes and the intermolecular interaction and concentration quenching in a solid state film” 国際会議

    Y. Kawamura, J. Brooks, J. J. Brown, H. Sasabe and C. Adachi

    SPIE’s International Symposium on Optics & Photonics 2005  2005年7月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego   国名:アメリカ合衆国  

  • “Phosphorescence quantum efficiency and intermolecular interaction of iridium (III) complexes in co-deposited films with organic semiconducting hosts” 国際会議

    Y. Kawamura, K. Goushi, J. Brooks, J. J. Brown, H. Sasabe and C. Adachi

    Material Research Society (MRS) 2004 Fall Meeting  2004年11月 

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    会議種別:口頭発表(一般)  

    開催地:Boston   国名:アメリカ合衆国  

  • “High Efficiency White Electrophosphorescence Mechanism with Two Phosphorescent Dopants System” 国際会議

    Y. Sato, K. Goushi, H. Sasabe, J. J. Brown and C. Adachi

    3rd Chitose International Forum on Photonics Science & Technology(CIST)  2002年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Electrical Characteristics of a Static Induction Transistor with a PEDOT Gate Electrode” 国際会議

    Y. Yamamoto, T. Oyamada, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • Full-color emission tuning of aggregative emitter through the exciplex formation 国際会議

    Youichi TSUCHIYA, Hinwai Mo, Fuyuki ITO, Chihaya ADACHI

    XXth International Krutyn Summer School 2016  2016年5月 

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    会議種別:口頭発表(一般)  

    開催地:Krutyn   国名:ポーランド共和国  

  • Improvement of Electrical Properties of Organic Films by Cold Isostatic Pressing 招待 国際会議

    Yu Esaki, Toshinori Matsushima, and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Very Efficient Quasi-continuous-wave Lasing from Organic Semiconductor Films

    ○A. S. D. Sandanayaka, T. Matsushima and C. Adachi

    第77回応用物理学会秋季学術講演会  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:Niigata   国名:日本国  

  • Continuous-wave lasing from organic semiconductor films

    ○Atula S. D. Sandanayaka, T. Matsushima, F. Bencheikh, K. Yoshida, M. Inoue, T. Fujihara, K. Goushi, J. C. Ribierre, and C. Adachi

    第64回応用物理学会春季学術講演会  2017年3月 

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    会議種別:口頭発表(一般)  

    開催地:Yokohama   国名:日本国  

  • Low-threshold Quasi-continuous-wave Organic Semiconductor Laser 国際会議

    ○Atula S. D. Sandanayaka, Toshinori Matsushima, Kou Yoshida, Takashi Fujihara, Kenichi Goushi, Jean-Charles Ribierre, and Chihaya Adachi

    KJF-ICOMEP2016  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:Fukuoka   国名:日本国  

  • Continuous-Wave and Quasi-Continuous-Wave Organic Thin-Film Distributed Feedback Lase 招待 国際会議

    ○Atula S. D. Sandanayaka, Kou Yoshida, Munetomo Inoue, Chuanjiang Qin, Kenichi Goushi, Jean-Charles Ribierre, Toshinori Matsushima, Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Continuous-Wave and Quasi-Continuous-Wave Organic Thin-Film Distributed Feedback Lase 招待 国際会議

    ○Atula S. D. Sandanayaka, Kou Yoshida, Munetomo Inoue, Chuanjiang Qin, Kenichi Goushi, Jean-Charles Ribierre, Toshinori Matsushima, Chihaya Adachi

    ICNST2016  2016年4月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Continuous-wave operation of organic thin-film distributed feedback laser 国際会議

    ○Atula S.D. Sandanayaka, Toshinori Matsushima, Fatima Bencheikh, Kou Yoshida, Munetomo Inoue, Takashi Fujihara, Kenichi Goushi, Jean-Charles Ribierre, and Chihaya Adachi

    European Materials Research Society(EMRS), 2017 Spring Meeting  2017年5月 

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    会議種別:口頭発表(一般)  

    開催地:Strasbourg   国名:フランス共和国  

  • Quasi Continuous-Wave Lasing in Organic Thin-Film Semiconductors 招待 国際会議

    ○Atula S.D. Sandanayaka, Kou Yoshida, Munetomo Inoue, Chuanjiang Qin, Kenichi Goushi, Jean-Charles Ribierre, Toshinori Matsushima and Chihaya Adachi

    20th SPIE Conference  2016年8月 

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    会議種別:口頭発表(一般)  

    開催地:Sandiego   国名:アメリカ合衆国  

  • Centrifugal Coated Quasi-2D CsPb2Br5 Emitter Layer for Perovskite Light-Emitting Diodes and Lasing

    ○C. Qin T. Matsushima, A. Sandanayaka, C. Adachi

    第64回応用物理学会春季学術講演会  2017年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Yokohama   国名:日本国  

  • Multifunctional Additive for Stable and Efficient Perovskite Solar Cells

    ○C. Qin, T. Matsushima, T. Fujihara, C. Adachi

    第77回応用物理学会秋季学術講演会  2016年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Niigata   国名:日本国  

  • CW lasing from organic thin-film DFB structures and outlook for electrical pumping 招待 国際会議

    ○Chihaya Adachi

    2nd FOSL  2018年1月 

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    会議種別:口頭発表(一般)  

    開催地:Guangzhou   国名:中華人民共和国  

  • Diversity of TADF technology in OLED and organic lasers 招待 国際会議

    ○Chihaya Adachi

    TADF Workshop 2017  2017年7月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • Exciton management in OLEDs and future organic laser diodes 招待 国際会議

    ○Chihaya Adachi

    ERPOS 2017  2017年7月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:St. Andrews  

  • Exciton management in organic thin films aimed for high performance TADF OLEDs and long persistent luminescence 招待 国際会議

    ○Chihaya Adachi

    APCC2017  2017年7月 

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    会議種別:口頭発表(一般)  

    開催地:St. Andrews  

  • Exciton management in OLEDs and future organic laser diodes 招待 国際会議

    ○Chihaya Adachi

    ISOPO 2017  2017年6月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Changchun   国名:中華人民共和国  

  • Control of Excitonic processes in organic semiconductors aimed for high performance OLEDs and Organic lasers 招待 国際会議

    ○Chihaya Adachi

    International Symposium on Micro-Nano Science and Technology 2016 (MNST 2016)  2016年12月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Tokyo   国名:日本国  

  • Control of Excitonic processes in organic semiconductors aimed for high performance OLEDs and Organic lasers 招待 国際会議

    ○Chihaya Adachi

    Seminar at Imperial Colledge  2016年11月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:London   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • Organic light emitting diodes demonstrating 100% electron into photon conversion based on delayed fluorescence molecules 招待 国際会議

    ○Chihaya Adachi

    C&FC 2016  2016年11月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Taipei   国名:台湾  

  • Organic light emitting diodes demonstrating 100% electron into photon conversion based on delayed fluorescence molecules 招待

    ○Chihaya Adachi

    43rd CEMS Colloquium  2016年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Saitama   国名:日本国  

  • The third generation OLEDs based on thermally activated delayed fluorescence 招待 国際会議

    ○Chihaya Adachi

    ADMD2016  2016年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Shanghai   国名:中華人民共和国  

  • Control of Excitonic processes in organic semiconductors aimed for high performance OLEDs and Organic lasers 招待 国際会議

    ○Chihaya Adachi

    Seminar at Zhejiang University  2016年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Zhejiang   国名:中華人民共和国  

  • High performance OLEDs Based on TADF 国際会議

    ○Chihaya Adachi

    1st International Conference of Molecular Engineering of Polymers MEP2016  2016年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Shanghai   国名:中華人民共和国  

  • Degradation Mechanism of Perovskite Solar Cells under Standard Test Conditions 国際会議

    ○Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi

    AP HOPV-18  2018年1月 

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    会議種別:口頭発表(一般)  

    開催地:沖縄   国名:日本国  

  • Intrinsic Degradation Mechanism of Perovskite Solar Cells under Standard Test Conditions 国際会議

    ○Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi

    ISEST2018  2018年1月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • Intrinsic Degradation Mechanism of Planar Perovskite Solar Cells under Standard Test Conditions 国際会議

    ○Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi

    ISOPO 2017  2017年6月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Changchun   国名:中華人民共和国  

  • Stable Planar Perovskite Solar Cells under Continuous Light Irradiation 国際会議

    ○Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi

    International Conference on Materials for Energy Applications (ICOMEA2017)  2017年1月 

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    会議種別:口頭発表(一般)  

    開催地:Hong Kong  

  • Improved Long-Term Stability of Planar Perovskite Solar Cells 国際会議

    ○Chuanjiang Qin, Toshinori Matsushima and Chihaya Adachi

    ICSM2016  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:Guangzhou   国名:中華人民共和国  

  • Device Stability of planar perovskite solar cells 国際会議

    ○Chuanjiang Qin, Toshinori Matsushima, Chihaya Adachi

    XXth International Krutyn Summer School 2017  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:Krutyn   国名:ポーランド共和国  

  • Highly efficient organic light-emitting diodes with horizontally oriented thermally-activated delayed fluorescence emitters 国際会議

    ○Dae-Hyeon Kim, Li Zhao, Ko Inada, Takeshi Komino, Naoki Matsumoto, Jean-Charles Ribierre and Chihaya Adachi

    KJF-ICOMEP2016  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:Fukuoka   国名:日本国  

  • Electrical simulation of organic light emitting diode under high current injection 国際会議

    ○F. BENCHEIKH, A. S. D. SANDANAYAKA, F. TOSHIYA1, T. MATSUSHIMA, C. ADACHI

    SPIE2017  2017年8月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego  

  • Optical and thermal simulation of optically pumped organic laser: Toward continuous wave operation 招待 国際会議

    ○F. Bencheikh, A. S. D. Sandanayaka, T. Matsushima, C. Adachi

    2nd FOSL  2018年1月 

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    会議種別:口頭発表(一般)  

    開催地:Guangzhou   国名:中華人民共和国  

  • Optical characterization of distributed feedback cavity for organic semiconductor laser 国際会議

    ○F. Bencheikh, A. S. D. Sandanayaka, and C. Adachi

    ISOPO 2017  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:Changchun   国名:中華人民共和国  

  • Exciton management in organic light emitting devices aimed for current injection organic lasers 招待 国際会議

    ○Fatima Bencheikh, Chihaya Adachi

    AUCAOS2017  2017年12月 

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    会議種別:口頭発表(一般)  

    開催地:Brisbane  

  • Excited state engineering for efficient reverse intersystem crossing process

    ○Hiroki Noda, Hajime Nakanotani, Ryota Kabe, Chihaya Adachi

    日本化学会第97春季年会  2017年3月 

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    会議種別:口頭発表(一般)  

    開催地:Yokohama   国名:日本国  

  • Blue Thermally Activated Delayed Fluorescence Molecule Having Acridan and Cyanobenzene Units

    ○Hiroki Noda, Ryota Kabe, Chihaya Adachi

    CIF17  2016年11月 

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    会議種別:口頭発表(一般)  

    開催地:Sapporo   国名:日本国  

  • Magnesium-gold binary alloy for organic light-emitting diodes with high corrosion resistance 国際会議

    ○Hiroya Arai, Hajime Nakanotani, Kei Morimoto, Chihaya Adachi

    The 8th Asian Conference on Organic Electronics  2016年12月 

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    会議種別:口頭発表(一般)  

    開催地:Kyoto   国名:日本国  

  • Thermally activated delayed fluorescence of Zr-based metal-organic framework 国際会議

    ○Hiroyuki Mieno, Ryota Kabe, Chihaya Adachi

    TADF Workshop 2017  2017年7月 

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    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • Suppression of nonradiative decay by isolation of aromatic emitter in zeolitic imidazolate framework ZIF-8 for realization of long-lived triplet excitons

    ○Hiroyuki Mieno, Ryota Kabe, Naoto Notsuka, Mark D. Allendorf, Chihaya Adachi

    MOF2016  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:California   国名:アメリカ合衆国  

  • Solvent-free liquid organic semiconductor laser devices 招待 国際会議

    ○J. C. Ribierre

    The 4th EOS Conference on Optofluidics,  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:Munich   国名:ドイツ連邦共和国  

  • Control of the molecular orientation and its critical role on the performance of organic semiconductor devices 招待 国際会議

    ○J.-C. Ribierre, T. Tanaka, L. Zhao, T. Komino, S. Matsumoto, D. Hashizume, K. Takaishi, T. Muto, M. Uchiyama, C. Andraud, T. Aoyama, C. Adachi

    SPIE Security + Defence, Symposium  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:Edinburgh   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • Towards CW lasing in organic semiconducting thin films 招待 国際会議

    ○Jean-Charles Ribierre, Toshinori Matsushima, Fatima Bencheikh, Kou Yoshida, Munetomo Inoue, Takashi Fujihara, Kenichi Goushi, Atula S.D. Sandanayaka, and Chihaya Adachi

    ERPOS 2017  2017年7月 

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    会議種別:口頭発表(一般)  

    開催地:St. Andrews  

  • Molecular orientation of light-emitting chromophores in ther-mally-evaporated and solution-processed doped films and its impact on the OLED performances 招待 国際会議

    ○Jean-Charles Ribierre, Li Zhao, Dae Hyeon Kim, Takeshi Komino, Kou Inada, Delphine Pitrat, Jean-Christophe Mulatier, Chantal Andraud, and Chihaya Adachi

    ICFPAM 2016  2016年10月 

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    会議種別:口頭発表(一般)  

    開催地:Daejeon   国名:大韓民国  

  • Quasi-continuous-wave organic semiconductor lasers using oxygen as triplet scavenger 招待 国際会議

    ○Jean-Charles Ribierre, Atula S.D. Sandanayaka, Li Zhao, Takeshi Komino, Delphine Pitrat, Jean-Christophe Mulatier, Munetomo Inoue, Kou Yoshida, Toshinori Matsushima, Chantal Andraud, Ju-Hyung Kim, and Chihaya Adachi

    21st SPIE Conference  2016年8月 

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    会議種別:口頭発表(一般)  

    開催地:Sandiego   国名:アメリカ合衆国  

  • Solvent-free liquid organic semiconductor laser devices 招待 国際会議

    ○Jean-Charles Ribierre, Li Zhao, Ju-Hyung Kim, Munetomo Inoue, Atula S.D. Sandanayaka, Kou Yoshida, Loic Mager, Stephane Méry, Chantal Andraud and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Solvent-free liquid organic semiconductor laser devices 招待 国際会議

    ○Jean-Charles Ribierre, Li Zhao, Ju-Hyung Kim, Munetomo Inoue, Atula S.D. Sandanayaka, Kou Yoshida, Loic Mager, Stephane Méry, Chantal Andraud and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Blue thermally activated delayed fluorescence of 9-(5,9-dioxa-13bboranaphtho[ 3,2,1-de]anthracen-7-yl)-1,3,6,8-tetramethyl-9Hcarbazole derivatives for organic light-emitting diodes 国際会議

    ○Jong Uk Kim, Ko Inada, Hiroko Nomura, In Seob Park, Lin-Song Cui, Yan Geng, Yuseok Yang, Hajime Nakanotani, and Chihaya Adachi

    The 10th Asian Conference on Organic Elecctronics  2017年10月 

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    会議種別:口頭発表(一般)  

    開催地:Daejeon   国名:大韓民国  

  • Thermally activated delayed fluorescence of bis(9,9-dimethyl-9,10-dihydroacridine)dibenzothiophene-S,S-dioxide derivatives for organic light-emitting diodes 国際会議

    ○Jong Uk Kim, Lin-Song Cui, Hiroko Nomura, Sunbin Hwang, Dae Hyeon Kim, Saripally Sudhaker Reddy, Hajime Nakanotani, Sung–Ho Jin, Chihaya Adachi

    The 2016 International Conference on Solid State Devices and Materials (SSDM2016)  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:Tsukuba   国名:日本国  

  • Vacuum co-deposition synthesis of ytterbium complex for infrared organic light-emitting diodes 国際会議

    ○Kazuya Jinnai, Ryota Kabe, and Chihaya Adachi

    The 8th Asian Conference on Organic Electronics  2016年12月 

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    会議種別:口頭発表(一般)  

    開催地:Kyoto   国名:日本国  

  • Vacuum Co-deposition Synthesis of Ytterbium Complex for Infrared Organic Light-Emitting Diodes 国際会議

    ○Kazuya Jinnai, Ryota Kabe, and Chihaya Adachi

    XXth International Krutyn Summer School 2016  2016年5月 

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    会議種別:口頭発表(一般)  

    開催地:Krutyn   国名:ポーランド共和国  

  • Vacuum Co-deposition Synthesis of Ytterbium Complex for Infrared Organic Light-Emitting Diodes 国際会議

    ○Kazuya Jinnai, Ryota Kabe, and Chihaya Adachi

    XXth International Krutyn Summer School 2016  2016年5月 

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    会議種別:口頭発表(一般)  

    開催地:Krutyn   国名:ポーランド共和国  

  • Investigation of Novel TADF Molecules Using Homozygous Design 国際会議

    ○Keita Tsuji, Youichi Tsuchiya, Ko Inada, Thomas Mustard, Mathew D. Halls, and Chihaya Adachi

    The 12th Asian Conference on Organic Elecctronics  2017年10月 

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    会議種別:口頭発表(一般)  

    開催地:Daejeon   国名:大韓民国  

  • Investigation of novel TADF molecules using homozygous design 国際会議

    ○Keita Tsuji, Youichi Tsuchiya, Ko Inada, Thomas Mustard, Mathew D. Halls, and Chihaya Adachi

    XXllth International Krutyn Summer School  2017年5月 

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    会議種別:口頭発表(一般)  

    開催地:Krutyn   国名:ポーランド共和国  

  • Achievement of long device lifetime by decreasing dipole moment of hole-blocking layer 国際会議

    ○Ko Inada, Hiroshi Fujimoto, Masayuki Yahiro, Satoshi Yukiwaki, Keiko Kusuhara, Nozomi Nakamura, Atula S. D. Sandanayaka, Takashi Suekane, Hong Wei, Katsuya Imanishi, and Chihaya Adachi

    SPIE2017  2017年8月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego  

  • Singlet-Triplet Exciton Annihilation Nearly Suppressed in Organic Semiconductor Laser Materials Using Oxygen as a Triplet Quencher 国際会議

    ○Li Zhao, Munetomo Inoue, Kou Yoshida, Atula S. D. Sandanayaka, Ju-Hyung Kim, Jean-Charles Ribierre, and Chihaya Adachi

    レーザー学会第479回研究会  2016年11月 

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    会議種別:口頭発表(一般)  

    開催地:Fukuoka   国名:日本国  

  • Controlling Synergistic Oxidation Processes for Efficient and Stable Blue Thermally Activated Delayed Fluorescence Devices 国際会議

    ○Lin-Song Cui, Qisheng Zhang, Chihaya Adachi

    European Advanced Materials Congress 2016  2016年8月 

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    会議種別:口頭発表(一般)  

    開催地:Stockholm   国名:スウェーデン王国  

  • High efficiency thermally activated delayed fluorescence through an excited-state intramolecular proton transfer 招待 国際会議

    ○Masashi Mamada, Ko Inada, Takeshi Komino, William J Potscavage Jr., Hajime Nakanotani, Chihaya Adachi

    SPIE2017  2017年8月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego  

  • Low amplified spontaneous emission threshold and efficient electroluminescence from organic dyes based on bis-stilbene

    ○Masashi Mamada, Toshiya Fukunaga, Atula S. D. Sandanayaka, Chihaya Adachi

    日本化学会 第98春季年会  2018年3月 

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    会議種別:口頭発表(一般)  

    開催地:千葉   国名:日本国  

  • Organo-Lead-Halide Perovskite for Solar Cells and Light Emitting Diodes by Chemical Vapor Deposition 招待 国際会議

    ○Matthew R. Leyden, Yabing Qi, Chihaya Adachi

    2018 Int’l Workshop on Green Energy System and Devices  2017年11月 

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    会議種別:口頭発表(一般)  

    開催地:愛知   国名:日本国  

  • Excited state alignment for efficient reverse intersystem crossing

    ○NODA, Hiroki, NAKANOTANI, Hajime, ADACHI, Chihaya

    光化学討論会  2017年9月 

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    会議種別:口頭発表(一般)  

    開催地:仙台   国名:日本国  

  • Confinement of Long-Lived Triplet Excitons in Organic Semiconducting Host–Guest Systems 国際会議

    ○Naoto Notsuka, Ryota Kabe, Kenichi Goushi, and Chihaya Adachi

    The 11th Asian Conference on Organic Elecctronics  2017年10月 

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    会議種別:口頭発表(一般)  

    開催地:Daejeon   国名:大韓民国  

  • O2 Detection Based on Quenching Thermally Activated Delayed Fluorescence from 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene 国際会議

    ○Ryoichi Ishimatsu, Yuko Kirino, Chihaya Adachi, Koji Nakano and Toshihiko Imato

    China-Japan-Korea symposium 2016 (CJK2016)  2016年8月 

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    会議種別:口頭発表(一般)  

    開催地:Wuyishan   国名:中華人民共和国  

  • Suppression of nonradiative decay for long-lived organic excitons 国際会議

    ○Ryota Kabe, Naoto Notsuka, Hiroyuki Mieno, Kou Yoshida, Chihaya Adachi

    ISOPO 2017  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:Changchun   国名:中華人民共和国  

  • Blue Thermally Activated Delayed Fluorescence Molecule Having Acridan and Cyanobenzene Units 国際会議

    ○Ryota Kabe, Hiroki Noda, Chihaya Adachi

    IKSS2017  2017年5月 

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    会議種別:口頭発表(一般)  

    開催地:Krutyn   国名:ポーランド共和国  

  • Long-lived organic excitons 招待 国際会議

    ○Ryota Kabe, Naoto Notsuka, Hiroyuki Mieno, Kou Yoshida, Chihaya Adachi

    Kyushu University-PolyU Workshop  2017年5月 

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    会議種別:口頭発表(一般)  

    開催地:Hong Kong  

  • Long-lived triplet excitons in organic materials 招待 国際会議

    ○Ryota Kabe, Naoto Notsuka, Hiroyuki Mieno, Kou Yoshida and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Long-lived triplet excitons in organic materials 招待 国際会議

    ○Ryota Kabe, Naoto Notsuka, Hiroyuki Mieno, Kou Yoshida and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Toward Continuous-Wave Lasing from Organic Thin Films 国際会議

    ○T. Matsushima, A. S. D. Sandanayaka, F. Bencheikh, K. Yoshida, M. Inoue, T. Fujihara, K. Goushi, J.-C. Ribierre, C. Adachi

    The 13th Asian Conference on Organic Elecctronics  2017年10月 

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    会議種別:口頭発表(一般)  

    開催地:Daejeon   国名:大韓民国  

  • Solution-Processed Organic-Inorganic Perovskite Thin-Film Transistors with High Carrier Mobilities 招待 国際会議

    ○T. Matsushima, A. S. D. Sandanayaka, C. Qin, T. Fujihara, and C. Adachi

    IUMRS-ICAM 2017  2017年8月 

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    会議種別:口頭発表(一般)  

    開催地:京都   国名:日本国  

  • Flat perovskite films for efficient solar cells 国際会議

    ○T. Matsushima, T. Fujihara, C. Qin, S. Terakawa, Y. Esaki, S. Hwang, A. S. D. Sandanayaka, W. J. Potscavage, Jr., and C. Adachi

    XXth International Krutyn Summer School 2016  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:Krutyn   国名:ポーランド共和国  

  • Highly Efficient Organic Light-Emitting Diodes with Completely Oriented Delayed Fluorescent Emitters 国際会議

    ○Takeshi Komino, Yuta Sagara, Hiroyuki Tanaka, Nozomi Nakamura, Hiroshi Fujimoto, Yuji Oki and Chihaya Adachi

    CLEO Europe 2017  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:Munich   国名:ドイツ連邦共和国  

  • Highly Efficient Organic Light-Emitting Diodes with Completely Oriented Delayed Fluorescent Emitters 国際会議

    ○Takeshi Komino, Yuta Sagara, Hiroyuki Tanaka, Shoui Haraguchi, Yuji Oki, Nozomi Nakamura, Hiroshi Fujimoto, and Chihaya Adachi

    CLEO:2016  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:San Jose   国名:アメリカ合衆国  

  • Triplet utilization for organic semiconductor laser 国際会議

    ○Taro Furukawa, Hajime Nakanotani, Chihaya Adachi

    Organic Semiconductors Conference 2016  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:Cavtat   国名:クロアチア共和国  

  • Analysis of Degradation Mechanism of Organic-Inorganic Perovskite Solar Cells for Stable Solar Power Conversion 招待 国際会議

    ○Toshinori Matsushima, Chuanjiang Qin, Takashi Fujihara, and Chihaya Adachi

    2017 Int’l Workshop on Green Energy System and Devices  2017年11月 

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    会議種別:口頭発表(一般)  

    開催地:愛知   国名:日本国  

  • Field-effect transistors with an organic-inorganic perovskite semiconductor 国際会議

    ○Toshinori Matsushima, Atula S. D. Sandanayaka, Chuanjiang Qina, Takashi Fujihara, and Chihaya Adachi

    ISOPO 2017  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:Changchun   国名:中華人民共和国  

  • Solution-processed organic-inorganic perovskite thin-film transistors with high hole and electron mobilities 招待 国際会議

    ○Toshinori Matsushima, Atula S. D. Sandanayaka, Chuanjiang Qin, Takashi Fujihara, and Chihaya Adachi

    The 6th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:福井   国名:日本国  

  • Solution-processed organic-inorganic perovskite field-effect transistors with high carrier mobilities 国際会議

    ○Toshinori Matsushima, Fabrice Mathevet, Benoît Heinrich, Shinobu Terakawa, Takashi Fujihara,6Chuanjiang Qin, Atula S. D. Sandanayaka, Jean-Charles Ribierre, and Chihaya Adachi

    European Materials Research Society(EMRS), 2018 Spring Meeting  2017年5月 

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    会議種別:口頭発表(一般)  

    開催地:Strasbourg   国名:フランス共和国  

  • Solution-processed organic-inorganic perovskite field-effect transistors 招待 国際会議

    ○Toshinori Matsushima, Atula S. D. Sandanayaka, Chuanjiang Qin, Takashi Fujihara, and Chihaya Adachi

    Kyushu University-PolyU Workshop  2017年5月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Hong Kong  

  • Organic-inorganic perovskite field-effect transistors 招待 国際会議

    ○Toshinori Matsushima, Sunbin Hwang, Atula S. D. Sandanayaka, Chuanjiang Qin, Shinobu Terakawa, Takashi Fujihara, Masayuki Yahiro, and Chihaya Adachi

    IDW/AD'16  2016年12月 

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    会議種別:口頭発表(一般)  

    開催地:fukuoka   国名:日本国  

  • Organic-inorganic perovskite field-effect transistors 国際会議

    ○Toshinori Matsushima, Sunbin Hwang, Atula S. D. Sandanayaka, Chuanjiang Qin, Shinobu Terakawa, Takashi Fujihara, Masayuki Yahiro, and Chihaya Adachi

    The 8th Asian Conference on Organic Electronics  2016年12月 

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    会議種別:口頭発表(一般)  

    開催地:Kyoto   国名:日本国  

  • Very High Carrier Mobilities in Organic-inorganic Perovskite Films 国際会議

    ○Toshinori Matsushima, Sunbin Hwang, Atula S. D. Sandanayaka, Chuanjiang Qin, Shinobu Terakawa, Takashi Fujihara, Masayuki Yahiro and Chihaya Adachi

    KJF-ICOMEP2016  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:Fukuoka   国名:日本国  

  • High-hole-mobility organic-inorganic perovskite field-effect transistors 国際会議

    ○Toshinori Matsushima, Sunbin Hwang, Atula S. D. Sandanayaka, Chuanjiang Qin, Takashi Fujihara, Masayuki Yahiro, and Chihaya Adachi

    20th SPIE Conference  2016年8月 

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    会議種別:口頭発表(一般)  

    開催地:Sandiego   国名:アメリカ合衆国  

  • Morphological control of organic-inorganic perovskite layers by hot isostatic pressing for efficient planar solar cells 国際会議

    ○Toshinori Matsushima, Takashi Fujihara, Chuanjiang Qin, Shinobu Terakawa, Yu Esaki, Sunbin Hwang, Atula S. D. Sandanayaka, William J. Potscavage, Jr., and Chihaya Adachi

    ICSM2016  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:Guangzhou   国名:中華人民共和国  

  • Realization of high carrier mobilities in organic-inorganic perovskite films 国際会議

    ○Toshinori Matsushima, Sunbin Hwang, Atula S. D. Sandanayaka, Chuanjiang Qin, Shinobu Terakawa, Takashi Fujihara, Masayuki Yahiro, and Chihaya Adachi

    9th International Symposium on Organic Molecular Electronics  2016年5月 

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    会議種別:口頭発表(一般)  

    開催地:Niigata   国名:日本国  

  • Vacuum-and-solvent-free fabrication of organic semiconductor layers for field-effect transistors 招待 国際会議

    ○Toshinori Matsushima, Atula S. D. Sandanayaka, Yu Esaki and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Vacuum-and-solvent-free fabrication of organic semiconductor layers for field-effect transistors 招待 国際会議

    ○Toshinori Matsushima, Atula S. D. Sandanayaka, Yu Esaki and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Organic-Inorganic Perovskite Field-Effect Transistors with High Carrier Mobilities 招待 国際会議

    ○Toshinori Matsushima

    Seminar at Zhejiang University  2016年10月 

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    会議種別:口頭発表(一般)  

    開催地:Zhejiang   国名:中華人民共和国  

  • Full-color emission tuning of aggregative emitter through the exciplex formation 国際会議

    ○Youichi TSUCHIYA, Hinwai Mo, Fuyuki ITO, Chihaya ADACHI

    XXth International Krutyn Summer School 2016  2016年5月 

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    会議種別:口頭発表(一般)  

    開催地:Krutyn   国名:ポーランド共和国  

  • Full-color emission tuning in OLED based on aggregation formation and aggregation induced exciplex formation

    ○Youichi Tsuchiya, Hajime Nakanotani, Fuyuki Ito, Chihaya Adachi

    日本化学会第97春季年会  2017年3月 

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    会議種別:口頭発表(一般)  

    開催地:Yokohama   国名:日本国  

  • Full-color emission control of OLED through aggregation induced exciplex formation 国際会議

    ○Youichi Tsuchiya, Hinwai Mo, Hajime Nakanotani, Fuyuki Ito, and Chihaya Adachi

    The 8th Asian Conference on Organic Electronics  2016年12月 

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    会議種別:口頭発表(一般)  

    開催地:Kyoto   国名:日本国  

  • Full-colour emission tuning based on aggregation induced exciplex formation of avobenzone boron difluoride 国際会議

    ○Youichi Tsuchiya, Hinwai Mo, Hajime Nakanotan, Fuyuki Ito and Chihaya Adachi

    Faraday Discussion: Aggregation Induced Emission  2016年11月 

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    会議種別:口頭発表(一般)  

    開催地:Guangzhou   国名:中華人民共和国  

  • Full-color emission tuning of aggregative emitter through the exciplex formation

    ○Youichi Tsuchiya, Fuyuki Ito and Chihaya Adachi

    ホスト・ゲスト化学シンポジウム2016  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:Kouchi   国名:日本国  

  • Compression of organic thin-films by cold isostatic pressing for enhanced device properties 国際会議

    ○Yu Esaki, Toshinori Matsushima, and Chihaya Adachi

    2017 International Conference on Solid State Devices and Materials (SSDM)  2017年9月 

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    会議種別:口頭発表(一般)  

    開催地:仙台   国名:日本国  

  • Gap Compression by Cold Isostatic Pressing in Organic Films 国際会議

    ○Yu Esaki, Toshinori Matsushima, and Chihaya Adachi

    KJF-ICOMEP2016  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:Fukuoka   国名:日本国  

  • Improvement of Electrical Properties of Organic Films by Cold Isostatic Pressing 招待 国際会議

    ○Yu Esaki, Toshinori Matsushima, and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Improvement of Electrical Properties of Organic Films by Cold Isostatic Pressing 招待 国際会議

    ○Yu Esaki, Toshinori Matsushima, and Chihaya Adachi

    ICNST2016  2016年4月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Development of Deep Blue TADF Emitters by Dihedral Angle Twisting and Advanced challenge to Planar Type TADF Emitters 国際会議

    ○Yuma Ishikawa, Lin-Song Cui, Xian-kai Chen, Youichi Tsuchiy, Jane-Luc Brédas, and Chihaya Adachi

    The 9th Asian Conference on Organic Elecctronics  2017年10月 

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    会議種別:口頭発表(一般)  

    開催地:Daejeon   国名:大韓民国  

  • Synthesis and optical properties of novel TADF molecules based on trioxoazatriangulene 国際会議

    ○Yuma Ishikawa, Youichi Tsuchiya, and Chihaya Adachi

    XXllth International Krutyn Summer School  2017年5月 

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    会議種別:口頭発表(一般)  

    開催地:Krutyn   国名:ポーランド共和国  

  • 外部ガス導入によるコロネン包摂多孔性金属錯体の三重項励起子制御

    ○三重野 寛之,嘉部 量太,安達 千波矢

    第78回 応用物理学会 秋季学術講演会  2017年9月 

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    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • コロネン包摂多孔性配位高分子による長寿命室温りん光

    ○三重野寛之、嘉部量太、能塚直人、安達千波矢

    ホスト・ゲスト化学シンポジウム2016  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:Kouchi   国名:日本国  

  • 高平面・縮環構造の熱活性化遅延蛍光材料を導出可能な新規分子設計

    ○儘田 正史, 稲田 工, 小簑 剛, 中野谷 一, 安達 千波矢

    第64回応用物理学会春季学術講演会  2017年3月 

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    会議種別:口頭発表(一般)  

    開催地:Yokohama   国名:日本国  

  • 熱活性化遅延蛍光分子の光物性とOLEDへの展開 招待

    ○儘田 正史、安達 千波矢

    光化学協会 応用講座2017  2017年11月 

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    会議種別:口頭発表(一般)  

    開催地:神奈川   国名:日本国  

  • 励起状態分子内プロトン移動による熱活性化遅延蛍光の発現

    ○儘田 正史、稲田 工、小簑 剛、William J. Potscavage, Jr.、中野谷 一、安達 千波矢

    有機EL討論会第24回例会  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 熱活性化遅延蛍光分子における同位体置換効果

    ○加嶋 優貴, 中野谷 一, 安達 千波矢

    有機EL討論会第24回例会  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • Long-lived excited states and charge-separated states of organic molecules 招待 国際会議

    ○嘉部量太

    Materials Horizons Symposium: Electronic and Photonic Materials  2017年11月 

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    会議種別:口頭発表(一般)  

    開催地:京都   国名:日本国  

  • Organic Long Persistent Luminescence

    ○嘉部量太、安達千波矢

    日本化学会 第98春季年会  2018年3月 

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    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 世界初の有機蓄光を用いた光エネルギーの有効利用 国際会議

    ○嘉部量太、安達千波矢

    九大エネルギーウイーク  2018年3月 

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    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 有機物からの長寿命発光 招待

    ○嘉部量太、能塚直人、三重野博之、安達千波矢

    第38回光化学若手の会  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 高効率遅延蛍光材料及びOLEDの最前線 招待

    ○土屋 陽一、安達千波矢

    量子デバイスフォーラム京都2017  2017年11月 

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    会議種別:口頭発表(一般)  

    開催地:京都   国名:日本国  

  • 色素会合と励起子複合体形成によるフルカラー発光色制御

    ○土屋 陽一,巫 軒偉,伊藤 冬樹,安達 千波矢

    第77回応用物理学会秋季学術講演会  2016年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Niigata   国名:日本国  

  • 熱活性遅延蛍光を有する水分散ナノ粒子の開発

    ○土屋陽一、池末浩大、安達千波矢

    日本化学会 第98春季年会  2018年3月 

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    会議種別:口頭発表(一般)  

    開催地:千葉   国名:日本国  

  • 第三世代有機EL発光材料の登場ー究極の発光デバイスへー 招待

    ○安達 千波矢

    コロイド先端技術講座Ⅱ  2016年11月 

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    会議種別:口頭発表(一般)  

    開催地:Tokyo   国名:日本国  

  • 基礎研究に根ざした革新的な有機EL用発光材料の創製から九大発ベンチャーへの展開 招待

    ○安達 千波矢

    第12回合同活動報告会 九大・北大から世界へ大学発ベンチャーの挑戦  2016年11月 

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    会議種別:口頭発表(一般)  

    開催地:Tokyo   国名:日本国  

  • 高効率熱活性化遅延蛍光材料の分子設計と高性能OLEDの実現 招待

    ○安達 千波矢

    S&Tセミナー  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:Tokyo   国名:日本国  

  • 有機発光デバイスの最前線 招待

    ○安達千波矢

    第6回ImPACT班会議  2017年12月 

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    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 高効率遅延蛍光材料及びOLEDの最前線 招待

    ○安達千波矢

    第66回高分子討論会  2017年9月 

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    会議種別:口頭発表(一般)  

    開催地:愛媛   国名:日本国  

  • 有機発光分子の新展開-TADF・レーザー・長寿命発光- 招待

    ○安達千波矢

    第78回 応用物理学会 秋季学術講演会  2017年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 第三世代有機EL発光材料の創成とベンチャー設立、そして、有機半導体レーザーへの展開 招待

    ○安達千波矢

    マイクロナノ先端技術交流会  2017年9月 

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    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 有機EL素子の高効率・低コスト・長寿命化技術と実用化に向けた課題・研究動向 招待

    ○安達千波矢

    サイエンス&テクノロジー  2017年7月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 界面制御による有機ELデバイスの飛躍的な耐久性の向上 招待

    ○安達千波矢

    理研 X 九大 X 福岡市 イノベーションフォーラム  2017年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Fukuoka   国名:日本国  

  • 熱活性化遅延蛍光材料の最前線とOLEDへの展開 招待

    ○安達千波矢

    第61回光機能材料研究講演会  2017年2月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Tokyo   国名:日本国  

  • 革新的な有機発光材料の創製から九大発ベンチャーへの展開 招待

    ○安達千波矢

    大学発ベンチャー創出シンポジウム ベンチャーキャピタル と 大学 との協業 に向けて  2017年1月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Tokyo   国名:日本国  

  • 有機発光デバイスの最前線 招待

    ○安達千波矢、中野谷一

    光電相互変換第125委員会・情報科学用有機材料第142委員会  2017年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • ゲスト-ホスト系非晶質薄膜におけるゲスト分子の完全配向

    ○小簑剛, 相良雄太, 田中啓之, 興雄司, 中村望, 藤本弘, 安達千波矢

    分子科学討論会2016神戸  2016年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Kobe   国名:日本国  

  • スピンコート法によるゲスト分子の面内配向制御

    ○小簔剛、桑江博之、岡田愛姫子、付偉欣、水野潤、Jean-Charles Ribierre、興雄司、安達千波矢

    分子化学討論会2017  2017年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:仙台   国名:日本国  

  • 棒状のTADF 分子Cis-BOX2 における水平配向とその熱的安定性

    ○小簔剛、相良雄太、田中裕之、興雄司、安達千波矢

    有機EL討論会第24回例会  2017年6月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 有機無機ペロブスカイトLED 招待

    ○松島 敏則、シン センコウ、安達 千波矢

    応用電子物性分科会 研究例会  2017年11月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:京都   国名:日本国  

  • 有機無機ペロブスカイト半導体を用いた高キャリア移動度トランジスタ 招待

    ○松島 敏則、サンガランゲ ドン アトゥラ サンダナヤカ、シン センコウ、藤原 隆 、安達 千波矢

    薄膜材料デバイス研究会  2017年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:京都   国名:日本国  

  • 有機無機ペロブスカイトトランジスタのn型特性 招待

    ○松島敏則, A. S. D. Sandanayaka, C. Qin, 藤原隆, 安達千波矢

    第77回応用物理学会秋季学術講演会  2016年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Niigata   国名:日本国  

  • 高耐久性ペロブスカイト太陽電池 招待

    ○松島敏則、秦川江、藤原隆、安達千波矢

    第1回 フロンティア太陽電池セミナー  2016年11月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Kyoto   国名:日本国  

  • 有機無機ペロブスカイトをホスト材料として用いた有機EL

    ○松島敏則,Fatima Bencheikh, Matthew Leyden, Atula S. D. Sandanayaka, Chuanjiang Qin, 安達千波矢

    第65回応用物理学会春季学術講演会  2018年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 単結晶有機ELにおける励起子の拡散と失活に関するシミュレーション

    ○椎原 由宇, 桑江 博之, 吉田 巧, 井上棟智, 水野 潤, 安達 千波矢

    第12回有機デバイス・物性院生研究会  2017年7月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:京都   国名:日本国  

  • 単結晶有機ELにおける励起子の拡散と失活に関するシミュレーション

    ○椎原由宇・吉田巧・井上棟智・安達千波矢

    第38回光化学若手の会  2017年6月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 熱活性化遅延蛍光分子をホストとする 近赤外燐光有機 EL素子

    ○永田 亮,中野谷 一,安達 千波矢

    有機EL討論会  2016年11月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Toyama   国名:日本国  

  • 熱活性化遅延蛍光分子をホストとする 近赤外燐光有機 EL素

    ○永田 亮,中野谷 一,安達 千波矢

    第77回応用物理学会秋季学術講演会  2016年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Niigata   国名:日本国  

  • 有機電界発光素子における一重項励起子開裂過程の利用

    ○永田亮、中野谷一、安達千波矢

    第65回応用物理学会春季学術講演会  2018年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 熱活性化遅延蛍光分子をホストとする近赤外燐光有機EL素子

    ○永田亮、中野谷一、安達千波矢

    第38回光化学若手の会  2017年6月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 有機アモルファス膜の高密度化による電気伝導性・大気安定性の向上

    ○江崎有、小簔剛、松島敏則、安達千波矢

    有機EL討論会 第25回例会  2017年11月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:札幌   国名:日本国  

  • Alq3薄膜のアモルファス構造および光物性の真空蒸着条件依存性

    ○江崎有、松島敏則、安達千波矢

    第65回応用物理学会春季学術講演会  2018年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 有機アモルファス薄膜の高密度化による電気伝導性および大気安定性の向上

    ○江崎有、松島敏則、小簔剛、安達千波矢

    第78回 応用物理学会 秋季学術講演会  2017年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 有機半導体薄膜の高密度化による薄膜・デバイス物性の向上

    ○江崎有、松島敏則、小簔剛、安達千波矢

    第12回有機デバイス・物性院生研究会  2017年7月 

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    会議種別:口頭発表(一般)  

    開催地:京都   国名:日本国  

  • ラジカルイオン種の光吸収が電気化学発光スペクトルに及ぼす影響

    ○石松亮一、安達千波矢、中野幸二、今任稔彦

    第63回ポーラログラフィーおよび電気分析化学討論会  2017年11月 

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    会議種別:口頭発表(一般)  

    開催地:山口   国名:日本国  

  • Electric-field-induced fluorescence quenching in BSB-Cz layers

    ○福永利哉、Fatima Bencheikh、松島敏則、安達千波矢

    第65回応用物理学会春季学術講演会  2018年3月 

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    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 計算化学による有機EL分子の安定性の解析

    ○稲田 工、藤本 弘、Atula S. D. Sandanayaka、八尋 正幸、柚木脇 智、末包 高史、今西 克也、韋 宏、 安達 千波矢

    有機EL討論会第24回例会  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 有機蓄光における電子ドナー・アクセプター材料の影響

    ○西村尚大、陣内和哉、嘉部量太、安達千波矢

    日本化学会 第98春季年会  2018年3月 

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    会議種別:口頭発表(一般)  

    開催地:千葉   国名:日本国  

  • ホモ接合型構造を有する新規熱活性化遅延蛍光材料の合成とその光物性

    ○辻 啓太、土屋 陽一、安達 千波矢

    日本化学会 第98春季年会  2018年3月 

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    会議種別:口頭発表(一般)  

    開催地:千葉   国名:日本国  

  • 高効率逆項間交差(RISC)を目指した熱活性型遅延蛍光(TADF)材料の励起状態制御

    ○野田大貴・中野谷一・嘉部量太・安達千波矢

    第38回光化学若手の会  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 共蒸着法によるイッテルビウム錯体の合成と赤外発光OLEDへの応用

    ○陣内 和哉、嘉部 量太、安達 千波矢

    有機EL討論会第24回例会  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:東京   国名:日本国  

  • 共蒸着法によるイッテルビウム錯体の合成と赤外有機発光ダイオードへの応用

    ○陣内 和哉、嘉部 量太、安達 千波矢

    日本化学会第98春季年会  2017年3月 

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    会議種別:口頭発表(一般)  

    開催地:Yokohama   国名:日本国  

  • 共蒸着法によるイッテルビウム錯体の合成と赤外発光OLEDへの応用

    ○陣内和哉・嘉部量太・安達千波矢

    第38回光化学若手の会  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 高性能有機光デバイスのための分子デザイン

    〇中野谷 一、安達 千波矢

    第78回 応用物理学会 秋季学術講演会  2017年9月 

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    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 平面構造を有する新規TADF分子の設計と光電子物性

    〇土屋 陽一, 石川 悠眞, Chen Xiankai, Bredas Jean-Luc, 安達 千波矢

    第79回 応用物理学会 秋季学術講演会  2017年9月 

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    会議種別:口頭発表(一般)  

    開催地:福岡   国名:日本国  

  • 有機無機ペロブスカイトトランジスタにおける接触抵抗の影響

    〇松島 敏則、Hwang Sunbin、寺川 しのぶ、藤原 隆、Sandanayaka Atula S. D.、Qin Chuanjiang、安達 千波矢

    第64回応用物理学会春季学術講演会  2017年3月 

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    会議種別:口頭発表(一般)  

    開催地:Yokohama   国名:日本国  

  • “パターン化と光物性の測定”

    カートハウス・オラフ,新垣志保,和田敏裕,安達千波矢,遠藤礼隆

    第54回高分子討論会  2005年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “TSC測定による有機ELデバイスの劣化機構の解析” 招待

    中原誠,皆川正寛,田所豊康,小山田崇人,雀部博之,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

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    会議種別:口頭発表(一般)  

    開催地:武蔵工大   国名:日本国  

  • “遠紫外PESA法による有機EL材料の電子状態測定”

    中島嘉之,山下大輔,遠藤礼隆,安達千波矢,宇田応之

    第53回高分子討論会  2004年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “ビススチリルベンゼン誘導体を用いた低閾値光励起型有機DFB固体レーザ”

    中野谷一, 河村祐一郎, 雀部博之, 安達千波矢

    第52回応用物理学関係連合講演会  2005年3月 

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    会議種別:口頭発表(一般)  

    開催地:埼玉大   国名:日本国  

  • “ビススチリルベンゼン誘導体を発光層に用いた有機EL素子のRoll-off特性”

    中野谷一, 河村祐一郎, 合志憲一, 雀部博之, 安達千波矢

    第52回応用物理学関係連合講演会  2005年3月 

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    会議種別:口頭発表(一般)  

    開催地:埼玉大   国名:日本国  

  • 有機-無機へテロ構造を有する両極性トランジスタ

    中野谷一, 矢野公規, 八尋正幸, 安達千波矢

    第54回応用物理学会学術講演会  2007年3月 

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    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • “OLEDへのパルス電圧印加による高電流密度の実現と励起子Annihilationの抑制”

    中野谷一,小山田崇人,雀部博之,安達千波矢

    第65回応用物理学会学術講演会  2004年9月 

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    会議種別:口頭発表(一般)  

    開催地:東北学院大   国名:日本国  

  • “新規フルオレン誘導体を用いた有機固体薄膜からの低閾値ASE発振の実現”

    中野谷一,松本直樹,西山正一,八尋正幸,安達千波矢

    第67回応用物理学会学術講演会  2006年8月 

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    会議種別:口頭発表(一般)  

    開催地:立命館大学   国名:日本国  

  • “有機薄膜の強励起下における発光特性と励起状態吸収との相関”

    中野谷一,渡邊禎之,加藤隆二,雀部博之,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

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    会議種別:口頭発表(一般)  

    開催地:武蔵工大   国名:日本国  

  • “4,4’-bis[(N-carbazole)styryl]biphenyl(BSB-Cz)のCW励起下における発光特性”

    中野谷一,雀部博之,安達千波矢

    第66回応用物理学会学術講演会  2005年9月 

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    会議種別:口頭発表(一般)  

    開催地:徳島大   国名:日本国  

  • “2つの有機層を有する有機FETの光照射によるメモリー効果”

    久保田大介,雀部博之,安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

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    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “青色リン光材料の固体媒体中における発光量子効率とエネルギー失活過程”

    今田直人,河村祐一郎,Jason Brooks, Julie J. Brown, 雀部博之,安達千波矢

    第65回応用物理学会学術講演会  2004年9月 

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    会議種別:口頭発表(一般)  

    開催地:東北学院大   国名:日本国  

  • “100%のPL量子収率を有する赤色リン光錯体PQ2Ir(acac)”

    今田直人,河村祐一郎,Jason Brooks, Julie J. Brown, 雀部博之,安達千波矢

    第65回応用物理学会学術講演会  2004年9月 

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    会議種別:口頭発表(一般)  

    開催地:東北学院大   国名:日本国  

  • “複数のリン光成分を含有する白色有機EL素子の発光機構”

    佐藤喜郎、合志憲一、雀部博之、Julie J. Brown、安達千波矢

    第63回応用物理学会学術講演会  2002年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “ジイミン-ジチオレート系白金錯体のりん光特性と有機EL素子化検討”

    佐藤祐,外山弥,児玉淳,猿渡紀男,井上博史,合志憲一,安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

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    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • ピレン誘導体を用いた発光トランジスタの高性能化

    八尋正幸,内生蔵広幸,坂上知,高橋隆由,岡田敏生,秋山誠治,奥良彰,下地規之,松重和美,年光昭夫,雀部博之,安達千波矢

    第54回応用物理学会関係連合講演会  2007年3月 

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    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • “発光トランジスタの開発とambipolarトランジスタへの展開”

    八尋正幸,安達千波矢

    2006年12月 

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    会議種別:口頭発表(一般)  

    開催地:東北大学金属材料研究所   国名:日本国  

  • 有機発光トランジスタとは?

    八尋正幸,安達千波矢

    第6回FPD研究会  2006年4月 

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    会議種別:口頭発表(一般)  

    開催地:東京都中小企業振興公社   国名:日本国  

  • ペンタセン薄膜トランジスタにおける基板表面処理効果

    八尋正幸,時任静士

    日本学術振興会第142委員会ABC合同部会  2006年3月 

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    会議種別:口頭発表(一般)  

    開催地:東京理科大学   国名:日本国  

  • ハイパーブランチポリマーの有機FETゲート絶縁膜への応用

    八尋正幸,田中章博,安達千波矢

    第54回応用物理学会関係連合講演会  2007年3月 

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    会議種別:口頭発表(一般)  

    開催地:青山学院大学   国名:日本国  

  • ピレン誘導体を用いた発光型有機トランジスタのデバイス特性

    内生蔵広幸, 秋山誠治, 高橋隆由, 雀部博之, 安達千波矢

    2006年日本化学会西日本大会  2006年11月 

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    会議種別:口頭発表(一般)  

    開催地:琉球大学   国名:日本国  

  • “高速電荷移動度を目指した有機発光型トランジスター用材料の開発”

    内生蔵広幸,小山田崇人,秋山誠治,松重和美,雀部博之,安達千波矢

    第53回応用物理学関係連合講演会  2006年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:武蔵工大   国名:日本国  

  • “低分子共蒸着膜におけるambipolar特性と発光トランジスターの実現”

    内生蔵広幸,小山田崇人,菅沼直俊,松重和美,雀部博之,安達千波矢

    第65回応用物理学会学術講演会  2004年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東北学院大   国名:日本国  

  • “ビススチリル系トランジスタ材料の高速移動度への展開”

    内生蔵広幸,秋山誠治,高橋隆由,坂上 知,八尋正幸,雀部博之,安達千波矢

    第67回応用物理学会学術講演会  2006年8月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:立命館大学   国名:日本国  

  • “ピレンダイマーを用いた発光型有機FETのデバイス特性”

    内生蔵広幸,秋山誠治,小山田崇人,松重和美,雀部博之,安達千波矢

    第66回応用物理学会学術講演会  2005年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:徳島大   国名:日本国  

  • “有機りん光素子におけるRoll-off現象の制御”

    冨田勇人,合志憲一,J. J. Brown,雀部博之,安達千波矢

    第49回応用物理学会関係連合講演会  2002年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東海大学・湘南校舎   国名:日本国  

  • “Ir(ppy)3の励起子拡長の検討”

    合志憲一、Julie. J. Brown、雀部博之、安達千波矢

    第64回応用物理学会学術講演会  2003年8月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:福岡大学   国名:日本国  

  • “低温におけるIr(ppy)3 の特異な発光特性”

    合志憲一、Julie J. Brown、雀部博之、安達千波矢

    第50回応用物理学会関係連合講演会  2003年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “Btp2Ir(acac):CBP膜におけるエネルギー移動及び失活機構”

    合志憲一、Julie J. Brown、雀部博之、安達千波矢

    第63回応用物理学会学術講演会  2002年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “イリジウム化合物の特異な温度特性”

    合志憲一、安達千波矢

    CIF4サテライトフォーラム 有機半導体デバイスの基礎物理  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:ニドム、苫小牧   国名:日本国  

  • “ゲスト−ホスト系におけるリン光材料の発光メカニズム”

    合志憲一、安達千波矢

    電気学会・電子材料研究会  2003年2月 

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    会議種別:口頭発表(一般)  

    開催地:電気学会、市ヶ谷   国名:日本国  

  • “Ir(ppy)3 の三重項励起状態の閉じ込めと散逸過程”

    合志憲一、猪股寛子、Julie J. Brown, 雀部博之、安達千波矢

    第50回応用物理学会関係連合講演会  2003年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “CBPホスト中におけるIr(ppy)3の三重項励起子拡散過程”

    合志憲一,Jason Brooks,Julie J. Brown,雀部博之,安達千波矢

    第66回応用物理学会学術講演会  2005年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:徳島大   国名:日本国  

  • “Ir(ppy)3 の励起三重項準位におけるスピン緩和過程” 招待

    合志憲一,Jason Brooks,Julie J. Brown,雀部博之,安達千波矢

    第52回応用物理学関係連合講演会  2005年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:埼玉大   国名:日本国  

  • “固体薄膜中におけるIr(ppy)3の発光機構”

    合志憲一,Julie J. Brown,雀部博之,安達千波矢

    第51回応用物理学関係連合講演会  2004年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東京工科大   国名:日本国  

  • “有機ポラリトンレーザーを目指した励起子ポラリトンデバイスの設計”

    合志憲一,八尋正幸,安達千波矢

    第67回応用物理学会学術講演会  2006年8月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:立命館大学   国名:日本国  

  • “固体薄膜中におけるIr(ppy)3の励起エネルギー失活過程の解明” 招待

    合志憲一,河村祐一郎,Jason Brooks, Julie J. Brown, 雀部博之,安達千波矢

    第53回高分子討論会  2004年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    国名:日本国  

  • “CuPcをホール注入層に用いたOLEDのI-V特性解析” 招待

    合志憲一,雀部博之,安達千波矢

    第66回応用物理学会学術講演会  2005年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:徳島大   国名:日本国  

  • “Eu(DBM)3phen:CBP膜におけるエネルギー移動機構”

    合志憲一,雀部博之,安達千波矢

    第49回応用物理学会関係連合講演会  2002年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:東海大学・湘南校舎   国名:日本国  

  • “ジキサンテン誘導体の高効率ホール注入によるOLEDの低駆動電圧化”

    吉田昌史, 土田哲平, 倉田高明, 池田征明, 雀部博之, 安達千波矢

    日本化学会第84春季年会  2004年3月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “有機LEDにおけるジキサンテン誘導体の高効率ホール注入機構の解明”

    吉田昌史,土田哲平,倉田高明,池田征明,雀部博之,安達千波矢

    第53回高分子討論会  2004年9月 

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    会議種別:口頭発表(一般)  

    国名:日本国  

  • “High Efficiency the Hole Injection Characteristics of Dixanthene Derivatives in OLEDs” 国際会議

    M. Yoshida, T. Tsuchida, T. Kurata, M. Ikeda and Chihaya Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • Exciton management in OLEDs and future organic laser diodes 招待 国際会議

    C. Adachi

    Kyushu University-PolyU Workshop  2017年5月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Hong Kong  

  • Exciton management in OLEDs and future organic laser diodes 招待 国際会議

    C. Adachi

    Center for Excitonics at MIT  2017年4月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Boston   国名:アメリカ合衆国  

  • “Organic light emitting transistor-operation mechanism and novel applications“ 招待 国際会議

    C. Adachi

    2nd Plastic Electronics Conference and Showcase  2006年10月 

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    会議種別:口頭発表(一般)  

    開催地:Frankfurt   国名:ドイツ連邦共和国  

  • “Organic light emitting transistor- Fundamental Characteristics and Applications &#8211;” 国際会議

    C. Adachi

    IDW/AD’05  2005年12月 

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    会議種別:口頭発表(一般)  

    開催地:Tokushima   国名:日本国  

  • “Challenge for novel organic light emitting devices” 国際会議

    C. Adachi

    The 4th TOPLEDA International Conference  2005年11月 

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    会議種別:口頭発表(一般)  

    開催地:Taipei   国名:台湾  

  • “Challenges for novel organic light emitting devices” 招待 国際会議

    C. Adachi

    The 5th International Meeting on Information Display (IMID 2005)  2005年7月 

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    会議種別:口頭発表(一般)  

    開催地:Seoul   国名:大韓民国  

  • “Organic Light-emitting Transistor” 招待 国際会議

    C. Adachi

    International Display Manufacturing Conferences (IDMC) 2005  2005年2月 

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    会議種別:口頭発表(一般)  

    開催地:Taipei   国名:台湾  

  • “Exciton annihilation processes under electrical pumping”, 招待 国際会議

    C. Adachi

    Korea Japan Joint Forum 2004 “Organic Materials for Electronics and Photonics”  2004年11月 

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    会議種別:口頭発表(一般)  

    開催地:Okinawa   国名:日本国  

  • “Emission mechanism of high efficiency organic electrophosphorescene” 国際会議

    C. Adachi

    FPD China  2004年8月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Kunshan Science and Culture Exhibition Center   国名:中華人民共和国  

  • “Carrier injection over 10KA/cm2 into organic thin films”

    C. Adachi

    NANO KOREA 2004  2004年8月 

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    会議種別:口頭発表(一般)  

    開催地:Seoul   国名:大韓民国  

  • “Emission Mechanism of 100% Efficiency OLED &#8211; Toward Organic Laser Diode” 国際会議

    C. Adachi

    UCLA Department of Materials Science and Engineering, Fall Quarter 2003 Seminar Series  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Los Angels   国名:アメリカ合衆国  

  • “OLED characteristics at high current density” 招待 国際会議

    C. Adachi

    IEEE/LEOS  2003年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Arizona   国名:アメリカ合衆国  

  • “Fundamentals of Organic Semiconductor Devices” 招待 国際会議

    C. Adachi

    The IEEE 2003 International Meeting for Future of Electron Devices  2003年7月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Osaka   国名:日本国  

  • “Physics of high efficiency organic electroluminescent diodes” 招待 国際会議

    C. Adachi

    The 5th International Conference on Nano-molecular Electronics  2002年12月 

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    会議種別:口頭発表(一般)  

    開催地:Kobe   国名:日本国  

  • “Organic EL and Laser” 招待 国際会議

    C. Adachi

    Korea-Japan Joint Forum 2001  2001年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Soul   国名:大韓民国  

  • “High efficiency organic light emitting diodes using electrophosphorescence” 招待 国際会議

    C. Adachi

    American Physical Society  2001年3月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Seattle   国名:アメリカ合衆国  

  • “Injection and Transport of Extremely High Current Densities in Organic Thin-Film Devices” 国際会議

    C. Adachi and T. Matsushima

    Optical Society of America (OSA)  2006年10月 

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    会議種別:口頭発表(一般)  

    開催地:Rochester   国名:アメリカ合衆国  

  • “High current density injection and transport into organic layers” 招待 国際会議

    C. Adachi and T. Matsushima

    SSDM  2006年9月 

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    開催地:Yokohama   国名:日本国  

  • “Amplified spontaneous emission characteristics and low-threshold mechanism in organic solid state thin film based on styrylbenzene derivatives” 招待 国際会議

    C. Adachi, H. Nakanotani, T. Matsushima and S. Akiyama, and Y. Kawamura

    SPIE International Symposium on Optics & Photonics  2006年8月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego   国名:アメリカ合衆国  

  • “Prospects for organic semiconductor lasers from an organic solid state film” 招待 国際会議

    C. Adachi, H. Nakanotani and T. Matsushima

    XXIst IUPAC symposium on photochemistry, 2006  2006年4月 

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    会議種別:口頭発表(一般)  

    開催地:Kyoto   国名:日本国  

  • “内部量子効率100%に達する有機りん光LEDの発光機構”

    C. Adachi, M. A. Baldo, M. E. Thompson, R. Kwong and S. R. Forrest

    第62回応用物理学会学術講演会  2002年9月 

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    会議種別:口頭発表(一般)  

    開催地:愛知工業大学   国名:日本国  

  • “有機りん光LEDによるRGB発光”

    C. Adachi, M. A. Baldo, M. E. Thompson, R. Kwong and S. R. Forrest

    第62回応用物理学会学術講演会  2002年9月 

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    会議種別:口頭発表(一般)  

    開催地:愛知工業大学   国名:日本国  

  • “High-efficiency electrophosphorescent organic light-emitting diodes” 招待 国際会議

    C. Adachi, M. A. Baldo, S. Lamansky, M. E. Thompson and S. R. Forrest

    SPIE-The international society of optical engineering  2001年7月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego   国名:アメリカ合衆国  

  • Blue electroluminescence from phosphorescent benzoxazole doped OLEDs 国際会議

    C. Adachi, M. A. Baldo, S. R. Forrest and M. E. Thompson

    Materials Research Society (1999 Fall meeting)  1999年12月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Boston   国名:アメリカ合衆国  

  • High efficiency organic electrophosphorescent diodes 招待 国際会議

    C. Adachi, M. A. Baldo, M. E. Thompson, S. R. Forrest

    International Symposium on Organic Molecular Electronics (The institute of electronics, information and communication) 

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    会議種別:口頭発表(一般)  

    開催地:Nagoya   国名:日本国  

  • “High- efficiency organic light emitting diodes, “The first international conference on the science and technology of emissive display and lighting” 招待 国際会議

    C. Adachi, R. C. Kwong, M. A. Baldo, M. E. Thompson and S. R. Forrest

    Society for Information Display  2001年11月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego   国名:アメリカ合衆国  

  • “Electrophosphorescent organic LEDs” 招待 国際会議

    C. Adachi, R. C. Kwong, M. A. Baldo, M. E. Thompson and S. R. Forrest

    Asia Display/IDW’01  2001年10月 

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    会議種別:口頭発表(一般)  

    開催地:Nagoya   国名:日本国  

  • “High Density Carrier Injection and Transport into Organic Thin Films -Device Physics and Novel Light Emitting Applications” 招待 国際会議

    C. Adachi, T. Matsushima and H. Nakanotani

    Materials Research Society (MRS)  2006年11月 

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    会議種別:口頭発表(一般)  

    開催地:Boston   国名:アメリカ合衆国  

  • “Extremely high current density injection and transport over MA/cm2 into organic thin films aiming for organic laser diodes” 招待 国際会議

    C. Adachi, T. Matsushima and H. Nakanotani

    ICON9/ICOPE2006  2006年9月 

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    会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:Brugge   国名:ベルギー王国  

  • “Estimation of carrier recombination and electroluminescence emission regions in organic light-emitting field effect transistors” 国際会議

    C. Adachi, T. Oyamada, H. Uchiuzou and S. Akiyama

    SPIE International Symposium on Optics & Photonics  2006年8月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:San Diego   国名:アメリカ合衆国  

  • “Exciton annihilation at high current density in organic light emitting diodes” 招待 国際会議

    C. Adachi, Y. Kawamura and H. Yamamoto

    IDW  2003年12月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Fukuoka   国名:日本国  

  • Molecular design for high efficiency delayed fluorescence and their application in OLEDs 招待 国際会議

    CHIHAYA ADACHI

    2013 MRS Fall Meeting  2013年12月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Boston, USA   国名:アメリカ合衆国  

  • New routes of triplet harvesting in organic light emiting diodes 招待 国際会議

    CHIHAYA ADACHI

    IDW ’13  2013年12月 

     詳細を見る

    開催地:Sapporo Convention Center   国名:日本国  

  • Elevated-Electrode Structure in Organic Thin-Film Transistors 国際会議

    CHIHAYA ADACHI

    IDW ’13  2013年12月 

     詳細を見る

    開催地:Sapporo Convention Center   国名:日本国  

  • New routes of triplet harvesting in organic light emitting diodes 招待 国際会議

    CHIHAYA ADACHI

    Workshop on OLEDs and Organic Photovoltaics  2013年12月 

     詳細を見る

    開催地:The University of Hong Kong, Hong Kong   国名:日本国  

  • A new route to harvest triplets for high-efficiency organic light-emitting diodes 招待 国際会議

    CHIHAYA ADACHI

    The 5th Asian Conference on Organic Electronics  2013年11月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:POSTECH, Korea   国名:大韓民国  

  • High efficiency OLED based on delayed fluorescence 招待 国際会議

    CHIHAYA ADACHI

    Fall 2013 National Meeting of the American Chemical Society  2013年9月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Indianapolis, USA   国名:アメリカ合衆国  

  • New Approaches Towards High-Efficiency Materials 招待 国際会議

    CHIHAYA ADACHI

    OLED World Summit 2013  2013年9月 

     詳細を見る

    開催地:San Francisco, USA   国名:アメリカ合衆国  

  • New Approaches Towards High-Efficiency Materials 招待 国際会議

    CHIHAYA ADACHI

    OLED World Summit 2013  2013年9月 

     詳細を見る

    開催地:San Francisco, USA   国名:アメリカ合衆国  

  • Third Generation Organic Light Emitting Diodes -Design for Molecular and Device Architectures- 招待 国際会議

    CHIHAYA ADACHI

    SSDM2013  2013年9月 

     詳細を見る

    開催地:福岡   国名:日本国  

  • Third Generation OLED by Hyperfluorescence 招待 国際会議

    CHIHAYA ADACHI

    8th National and Global Chinese Conference of Organic Molecules & Polymer Light-emitting Materials and Their Opto-electronic Properties  2013年7月 

     詳細を見る

    開催地:Chinese Academy of Sciences   国名:中華人民共和国  

  • Third Generation OLED by Delayed fluorescence 招待 国際会議

    CHIHAYA ADACHI

    10th Optical Probes Conference  2013年7月 

     詳細を見る

    開催地:Durham University, UK   国名:グレートブリテン・北アイルランド連合王国(英国)  

  • Third Generation OLED by Hyperfluorescence 招待 国際会議

    CHIHAYA ADACHI

    15th International Symposium on Novel Aromatic Compounds  2013年7月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Howard Civil Service International House, Taiwan   国名:台湾  

  • Third Generation OLED by hyperfluoresence 招待 国際会議

    CHIHAYA ADACHI

    ICMAT2013  2013年6月 

     詳細を見る

    開催地:Singapore   国名:シンガポール共和国  

  • 3rd generation organic light emitting diodes using delayed fluorescence 招待 国際会議

    CHIHAYA ADACHI

    2013 Taiwan OLED Lighting Conference  2013年6月 

     詳細を見る

    開催地:TWTC Nangang Exhibition Hall, Taiwan   国名:台湾  

  • Third Generation OLED by Hyperfluorescence 国際会議

    CHIHAYA ADACHI

    SID Display Week 2013  2013年5月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Vancouver, Canada   国名:カナダ  

  • Hyperfluorescence as a promising light emitting molecule in OLEDs 国際会議

    CHIHAYA ADACHI

    E-MRS 2013 Spring Meeting  2013年5月 

     詳細を見る

    開催地:Strasbourg, France   国名:フランス共和国  

  • Third Generation OLED by Hyperfluorescence 国際会議

    CHIHAYA ADACHI

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • Organic Light-emitting diodes employing Efficient Reverse Intersystem Crossing for Triplet to Singlet State Conversion 招待 国際会議

    CHIHAYA ADACHI

    International Conference on Optical, Optoelectronic and Photonic Materials and Applications (ICOOPMA)  2012年6月 

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    会議種別:口頭発表(一般)  

    開催地:奈良県奈良市   国名:日本国  

  • Dicarbazolyl dicyanobenzenes as Thermally Activated Delayed Fluorescence Emitters: Effect of Substitution Position on Photoluminescent and Electroluminescent Properties 国際会議

    CHIHAYA ADACHI, Hiroshi Miyazaki, Hiroko Nomura, QISHENG ZHANG, 吉田 巧, Bo Li

    The 5th Asian Conference on Organic Electronics  2013年11月 

     詳細を見る

    開催地:POSTECH, Korea   国名:大韓民国  

  • Thermally Activated Delayed Fluorescence (TADF) based on metal complexes 国際会議

    CHIHAYA ADACHI, Hiroshi Miyazaki, Hiroko Nomura, Yumi Sakai, 相良 雄太

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • Dicarbazolyldicyanobenzenes as Thermally Activated Delayed Fluorescence Emitters: Effect of Substitution Position on Photoluminescent and Electroluminescent Properties 国際会議

    CHIHAYA ADACHI, Hiroko Nomura, Hiroshi Miyazaki, 吉田 巧, QISHENG ZHANG

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • Development of red TADF emitters and their OLED characteristics 国際会議

    CHIHAYA ADACHI, Hirokazu Kuwabara, William John Potscavage, Tetsuya Nakagawa, QISHENG ZHANG, Takumi Shibata

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • Photometric flow injection determination of phosphate on a PDMS microchip equipped with an optical system assembled with an organic light emitting diode and an organic photodiode 国際会議

    CHIHAYA ADACHI, Ishimatsu Ryoichi, Koji Nakano, Toshihiko Imato, 八尋 正幸, Long Liu

    Asian Analysis XII (China-Japan-Korea Symposium on Analytical Chemistry)  2013年8月 

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    会議種別:口頭発表(一般)  

    開催地:福岡市   国名:日本国  

  • Highly Efficient Organic Light-Emitting Diode Based on a Hidden Thermally Activated Delayed Fluorescence Channel in a Heptazine Derivative 国際会議

    CHIHAYA ADACHI, Jie Li, Hiroshi Miyazaki, Hiroko Nomura, QISHENG ZHANG, Tetsuya Nakagawa, James MacDonald

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • Effect of Siloxane Derivatives on the Surface Morphology for Solution Processed OLED 国際会議

    CHIHAYA ADACHI, Kei Sakanoue, Masaki Aonuma, Jun Fukai, Yoshitake Suzuki, Hironobu Harada, Kento Ando

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • Novel EL mechanism based on energy transfer from intermolecular excited state into fluorescent dye 国際会議

    CHIHAYA ADACHI, Kenichi Goushi, 平山 雄太

    The 5th Asian Conference on Organic Electronics  2013年11月 

     詳細を見る

    開催地:POSTECH, Korea   国名:大韓民国  

  • Influence of the Host Matrix on Thermally-Activated Delayed Fluorescence: Short and Long Exciton Decay Processes via Dynamic Change in Singlet-Triplet Energy Gap and Exciplex Formation 国際会議

    CHIHAYA ADACHI, Kenichi Goushi, William John Potscavage

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • Fabrication of High-efficiency Multilayered Organic Light-emitting Diodes by a Film Transfer Method 国際会議

    CHIHAYA ADACHI, Kenji Kawano, 永吉 香

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • Elevated-Electrode Structure in Organic Thin-Film Transistors 国際会議

    CHIHAYA ADACHI, Kohei Tsugita, Tomohiko Ezura, Reiji Hattori

    IDW ’13  2013年12月 

     詳細を見る

    開催地:Sapporo Convention Center   国名:日本国  

  • Elevated-Electrode Structure in Organic Thin-Film Transistors 国際会議

    CHIHAYA ADACHI, Kohei Tsugita, Tomohiko Ezura, Reiji Hattori

    IDW ’13  2013年12月 

     詳細を見る

    開催地:Sapporo Convention Center   国名:日本国  

  • A monolithic PDMS spectroscopic analyzer having TADF-OLED light source for light induced fluorescence sensor system 国際会議

    CHIHAYA ADACHI, Kohei Tsugita, Tomohiko Ezura, Yuji Oki

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • OLED characteristics of emissive layers deposited by gas flow deposition under high speed condition 国際会議

    CHIHAYA ADACHI, Kohei Tsugita, Tomohiko Ezura

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • High-efficiency organic light-emitting diodes utilizing thermally-activated delayed fluorescence from triazine-based donor-acceptor hybrid molecules 国際会議

    CHIHAYA ADACHI, Lee SaeYoun, Hiroko Nomura, Takuma Yasuda

    2013 MRS Spring Meeting & Exhibit  2013年4月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:San Francisco, USA   国名:日本国  

  • Surface Morphology Control of Organic Semiconductor Layers using Surface Control Additives on Solution Processes 国際会議

    CHIHAYA ADACHI, Masaki Aonuma, Kei Sakanoue, Jun Fukai, 原田 紘伸, 安藤 健人

    IDW ’13  2013年12月 

     詳細を見る

    開催地:Sapporo Convention Center   国名:日本国  

  • Leveling of Organic EL Solution on Line-Patterned Surface 招待 国際会議

    CHIHAYA ADACHI, Masaki Aonuma, Jun Fukai, Kei Sakanoue, 原田 紘伸, 安藤 健人

    Workshop on OLEDs and Organic Photovoltaics  2013年12月 

     詳細を見る

    開催地:The University of Hong Kong, Hong Kong   国名:日本国  

  • Efficient Blue Organic Light-Emitting Diodes Employing Thermally Activated Delayed Fluores 国際会議

    CHIHAYA ADACHI, QISHENG ZHANG, HUANG SHUPING, Hiroko Nomura, Hiroyuki Tanaka

    TADF International Workshop  2013年3月 

     詳細を見る

    開催地:アクロス福岡   国名:日本国  

  • A six-carbazole-decolated cyclophosphazene as a high triplet energy host for efficient delayed- fluorescence OLEDs 国際会議

    CHIHAYA ADACHI, Takuma Yasuda, 西本 琢朗, Sae Youn Lee

    The 5th Asian Conference on Organic Electronics  2013年11月 

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    開催地:POSTECH, Korea   国名:大韓民国  

  • Novel Materials Design for High Efficiency OLEDs 国際会議

    CHIHAYA ADACHI, Takuma Yasuda, Lee SaeYoun

    International Display Manufacturing Conference (IDMC13)  2013年8月 

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    開催地:Taiwan   国名:台湾  

  • Droplet Manipulation for the Fabrication of Organic Field-Effect Transistors by Inkjet Technique 国際会議

    CHIHAYA ADACHI, Takeshi Komino, 八尋 正幸, Hirokazu Kuwabara, 池田 征明, 瀧宮 和男

    The 40th International Symposium on Compound Semiconductor 2013  2013年5月 

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    会議種別:口頭発表(一般)  

    開催地:San Francisco, USA   国名:アメリカ合衆国  

  • Donor-Acceptor Structured1,4-Diazatriphenylene Derivatives Exhibiting Thermally Activated Delayed Fluorescence(TADF) 国際会議

    CHIHAYA ADACHI, Takuma Yasuda, Kazunori Togashi, Katsuyuki Shizu, Takehiro Takahashi

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Development of Novel Spiro-Type Thermally Activated Delayed Fluorescence (TADF) Materials 国際会議

    CHIHAYA ADACHI, Takuma Yasuda, 大熊 寛史, Katsuyuki Shizu, Jun Yun Kim, YANG YUSEOK

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Oxadiazole- and triazole-based highly-efficient thermally-activated delayed-fluorescence (TADF) emitters for organic light-emitting diodes 国際会議

    CHIHAYA ADACHI, Takuma Yasuda, Katsuyuki Shizu, Jiyoung Lee, Hiroyuki Tanaka, Hiroko Nomura

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Selectively Controlled Orientational Order in Linear-Shaped Thermally Activated Delayed Fluorescent Dopants 国際会議

    CHIHAYA ADACHI, Takeshi Komino, Hiroyuki Tanaka

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Bipolar spirobifluorene: electroluminescence based on thermally activated delayed fluorescence 国際会議

    CHIHAYA ADACHI, Tetsuya Nakagawa, Ken-Tsung Wong, Sung-Yu Ku

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Solution-Processed OLEDs using TADF Materials 国際会議

    CHIHAYA ADACHI, Tomohiko Ezura, Hiroshi Miyazaki, Yoshitake Suzuki, QISHENG ZHANG

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Plasma-tolerant structure for organic light-emitting diodes with aluminum cathodes fabricated by DC magnetron sputtering 国際会議

    CHIHAYA ADACHI, Tomohiko Ezura, 藤本 弘

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Electrogenerated chemiluminescence with thermally activated delayed fluorescent materials and its application to fluorometric detection as a light source 国際会議

    CHIHAYA ADACHI, Toshihiko Imato, Ishimatsu Ryoichi, Koji Nakano, Shigeyuki Matsunami

    18th International Conference on Flow Injection Analysis  2013年9月 

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    開催地:Porto, Portugal   国名:ポルトガル共和国  

  • Analysis of exciton-exciton annihilations in 1,2,3,5-tetrakis(carbzol-9-yl)-4,6-dicyanobenzene exhibiting efficient thermally activated delayed fluorescence by steady state and transient photoluminescence measurements 国際会議

    CHIHAYA ADACHI, Toshiya Yonehara, 高須 勲, Tomoaki Sawabe

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Phenoxazine-Donor Based Thermally Activated Delayed Fluorescence Emitters and Its Applications to Organic Light-Emitting Diodes 国際会議

    CHIHAYA ADACHI, 中野谷 一, Hiroyuki Tanaka, Katsuyuki Shizu, Jiyoung Lee

    The 5th Asian Conference on Organic Electronics  2013年11月 

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    開催地:POSTECH, Korea   国名:大韓民国  

  • Blue light-emitting ambipolar transistors based on an di(phenylvinyl) anthracene single crystal with high carrier mobilities 国際会議

    CHIHAYA ADACHI, 中野谷 一, 井上 棟智

    15th International Symposium on Novel Aromatic Compounds  2013年7月 

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    会議種別:口頭発表(一般)  

    開催地:Howard Civil Service International House, Taiwan   国名:台湾  

  • Development of carrier-exciton separation in OLEDs aiming for suppression of roll-off 国際会議

    CHIHAYA ADACHI, 中野谷 一, 井上 棟智, 吉田 巧, 林 恭平

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • High-efficiency white organic light-emitting diodes utilizing thermally-activated delayed fluorescence 国際会議

    CHIHAYA ADACHI, 中野谷 一, 平賀 靖英, Junichi Nishide

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • High-efficiency white organic light-emitting diodes utilizing thermally-activated delayed fluorescence 国際会議

    CHIHAYA ADACHI, 中野谷 一, 平賀 靖英, Junichi Nishide

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Blue light-emitting ambipolar field-effect transistors based 国際会議

    CHIHAYA ADACHI, 井上 棟智, 中野谷 一

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Transient electroluminescence and current responses of organic light-emitting diodes (OLEDs) under high current density in microsecond scale 国際会議

    CHIHAYA ADACHI, 吉田 巧, ZHANG LE, 中野谷 一

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Organic light-emitting diodes with energy transfer mechanism from intermolecular excited state into fluorescent dye 国際会議

    CHIHAYA ADACHI, 平山 雄太, Kenichi Goushi

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • 100 μm-Order Patterning of Organic Semiconductor Layers Using a Thermally Converted Precursor Technique and its Application to Organic Light Emitting Diodes 国際会議

    CHIHAYA ADACHI, 後藤 大輔, MZHAVIA ALEKSANDRE, 毛利 匡貴

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Approach to Visualization of OLEDs Structure Using Scanning Transmission Electron Microscope 国際会議

    CHIHAYA ADACHI, 松尾 修司

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • High Efficiency Organic Light-Emitting Diodes with Fluorescent Emitters 国際会議

    CHIHAYA ADACHI, 樋口 貴史, 古川 太郎, 中野谷 一

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Suppression of exciton quenching and analysis in TADF based OLEDs 国際会議

    CHIHAYA ADACHI, 樋口 貴史, 中野谷 一, Hiroshi Miyazaki

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Development of TADF materials using benzazole derivatives as electron-accepting units 国際会議

    CHIHAYA ADACHI, 相良 雄太, Katsuyuki Shizu

    15th International Symposium on Novel Aromatic Compounds  2013年7月 

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    会議種別:口頭発表(一般)  

    開催地:Howard Civil Service International House, Taiwan   国名:台湾  

  • Development of TADF materials using benzazole derivatives as electron-accepting units 国際会議

    CHIHAYA ADACHI, 相良 雄太, Katsuyuki Shizu

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Thermally Activated Delayed Fluorescence, Orientation Characteristics and Electroluminescence of 1,3,5-Tris(4-(diphenylamino)phenyl)-2,4,6-tricyanobenzene 国際会議

    CHIHAYA ADACHI, 種田 将嗣, Katsuyuki Shizu, Hiroyuki Tanaka

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • A six-carbazole-decolated cyclophosphazene as a high triplet energy host for efficient delayed-fluorescence 国際会議

    CHIHAYA ADACHI, 西本 琢朗, Takuma Yasuda, Lee SaeYoun

    TADF International Workshop  2013年3月 

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    開催地:アクロス福岡   国名:日本国  

  • Synthesis and photophysical properties of π-conjugated dithienometalloles and their application in organic light-emitting diodes

    CHIHAYA ADACHI, 近藤 良介, Takuma Yasuda, Jun Yun Kim, YANG YUSEOK

    2013 MRS Spring Meeting & Exhibit  2013年4月 

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    会議種別:口頭発表(一般)  

    開催地:San Francisco, USA   国名:アメリカ合衆国  

  • Uniform and Degradation-Free Lighting Device Using Liquid OLED Material 国際会議

    Changhoon Shim, Shuzo Hirata, Juro Oshima, Tomohiko Ezura, Reiji Hattori, CHIHAYA ADACHI

    SID Display Week International Symposium & Exhibition  2012年6月 

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    開催地:Boston, Massachusetts   国名:アメリカ合衆国  

  • Recent progresses in TADF based OLED and organic lasers 招待 国際会議

    Chiahya Adachi

    The Workshop of OLED Technology  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:Hsinchu   国名:台湾  

  • OLEDs Based on Exciton Processes 招待 国際会議

    Chiahya Adachi

    2016 5th Hsinchu summer course & workshop  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:Hsinchu   国名:台湾  

  • “High Efficiency Electrophosphorescent Organic Light Emitting Diodes” 国際会議

    Chihaya Adachi

    MIT Optics and Quantum Electronics Seminar  2001年4月 

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    会議種別:口頭発表(一般)  

    開催地:Boston   国名:アメリカ合衆国  

  • High Performance Organic LED and Perovskite Solar Cells 招待 国際会議

    Chuanjiang Qin, Toshinori Matsushima, Hajime Nakanotani and ○Chihaya Adachi

    UNSW – I2CNER 1st Energy Workshop  2016年7月 

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    会議種別:口頭発表(一般)  

    開催地:Sydney   国名:オーストラリア連邦  

  • Highly stable organic-inorganic perovskite solar cells 国際会議

    Chuanjiang Qin, ○Toshinori Matsushima, Takashi Fujihara, and Chihaya Adachi

    2017 International Conference on Solid State Devices and Materials (SSDM)  2017年9月 

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    会議種別:口頭発表(一般)  

    開催地:仙台   国名:日本国  

  • Introduction of benzoquinone additive for efficient and stable planar perovskite solar cells 国際会議

    Chuanjiang Qin, ○Toshinori Matsushima, Takashi Fujihara, and Chihaya Adachi

    SPIE2017  2017年8月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego  

  • “Observation of Memory Effect in an Organic Double-Layer FET Using a Perylene Derivative Under Light Irradiation” 国際会議

    D. Kubota and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • Control of excitonic processes in organic semiconductors aimed for high performance OLEDs and organic lasers 招待 国際会議

    Daniel Ping-Kuen Tsang, Hajime Nakanotani, Atula S. D. Sandanayaka, Toshinori Matsushima, and ○Chihaya Adachi

    Ewha Chemistry and Nano Science Int'l Symposium (ECNIS)  2017年5月 

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    会議種別:口頭発表(一般)  

    開催地:Seoul   国名:大韓民国  

  • Control of excitonic processes in organic semiconductors aimed for high performance OLEDs and organic lasers 招待 国際会議

    Daniel Ping-Kuen Tsang, Hajime Nakanotani, Atula S. D. Sandanayaka, Toshinori Matsushima, and ○Chihaya Adachi

    International Conference on Materials for Energy Applications (ICOMEA2017)  2017年1月 

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    会議種別:口頭発表(一般)  

    開催地:Hong Kong  

  • Molecular and device architecture design for highly efficient and durable OLEDs based on TADF 招待 国際会議

    Daniel Ping-Kuen Tsang, Toshinori Matsushima, ○Chihaya Adachi

    IDW/AD'16  2016年12月 

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    会議種別:口頭発表(一般)  

    開催地:fukuoka   国名:日本国  

  • Highly stable TADF-OLEDs and clarification of degradation mechanism 招待 国際会議

    Daniel Ping-Kuen Tsang, Toshinori Matsushima, Hajime Nakanotani and ○Chihaya Adachi

    The 8th Asian Conference on Organic Electronics  2016年12月 

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    会議種別:口頭発表(一般)  

    開催地:Kyoto   国名:日本国  

  • Operational stability enhancement in organic light-emitting diodes based on TADF 国際会議

    Daniel Ping-Kuen Tsang, Hajime Nakanotani and ○Chihaya Adachi

    20th SPIE Conference  2016年8月 

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    会議種別:口頭発表(一般)  

    開催地:Sandiego   国名:アメリカ合衆国  

  • Transparent contacts for organic thin film optoelectronic devices 国際会議

    G. Parthasarathy, C. Adachi, P. E. Burrows and S. R. Forrest

    SPIE Optical Science, Engineering and Instrumentation '00  2000年7月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego, California   国名:アメリカ合衆国  

  • High transparency efficient non-metallic cathodes for organic Optoelectronic devices 国際会議

    G. Parthasarathy, C. Adachi, P. E. Burrows and S. R. Forrest

    Materials Research Society (2000 Spring meeting)  2000年4月 

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    会議種別:口頭発表(一般)  

    開催地:San Francisco   国名:アメリカ合衆国  

  • “OLED Characteristics and Carrier Transport Properties of the Aryl Heterocyclic Derivatives” 国際会議

    H. Inomata, K. Goushi, T. Masuko, A. Kimura, T. Konno, Y. Nakamura, T. Imai, H. Sasabe, J. J. Brown and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Carrier Transport Properties of the Triazine Derivatives” 国際会議

    H. Inomata, T. Masuko, T. Konno, T. Imai, H. Sasabe, J. J. Brown and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “High Efficiency Organic Electrophosphorescent Diodes Using Triazine Electron Transport Materials” 国際会議

    H. Inomata, T. Masuko, T. Konno, T. Imai and C. Adachi

    3rd Chitose International Forum on Photonics Science & Technology (CIST)  2002年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Organic Electrophosphorescence Diodes with N, N’-bis(arylcarbazole) Derivatives as a Host Material” 国際会議

    H. Kasajima, H. Inomata, H. Yoshizaki, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Achievement of High Current Density of 320A/cm2 in α-NPD/Alq3 Based OLED” 国際会議

    H. Kasajima, H. Yamamoto, Y. Kawamura, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Low lasing threshold in organic distributed feedback solid state lasers using bisstyrylbenzene derivative as active material” 国際会議

    H. Nakanotani, H. Sasabe and C. Adachi

    SPIE’s International Symposium on Optics & Photonics 2005  2005年7月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego   国名:アメリカ合衆国  

  • Ambipolar field-effect transistor based on organic-inorganic oxide heterostructure 国際会議

    H. Nakanotani, K. Yano and C. Adachi

    E-MRS 2007 Spring Meeting  2007年5月 

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    会議種別:口頭発表(一般)  

    開催地:Palais de la Musique et des Congres (Strasbourg, France)   国名:フランス共和国  

  • “Realization of High Current Density and Control of Exciton Annihilations under Pulse Exciton in OLED” 国際会議

    H. Nakanotani, T. Oyamada, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Ambipolar Characteristics of the Co-deposited Film of Low-molecular Materials and the Realization of Light-emitting Transistors” 国際会議

    H. Uchiuzou, T. Oyamada, K. Matsushige, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Structure Design of an Organic Semiconductor Laser with Organic Multi-Layers for Aiming Electrical Pumping” 国際会議

    H. Yamamoto and C. Adachi

    3rd Chitose International Forum on Photonics Science & Technology(CIST)  2002年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Achievement of extremely high current density of 12000A/cm2 into organic thin films with high thermally conductive substrates” 国際会議

    H. Yamamoto, H. Kasajima, W. Yokoyama, H. Sasabe and C. Adachi

    Material Research Society (MRS) 2004 Fall Meeting  2004年11月 

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    会議種別:口頭発表(一般)  

    開催地:Boston   国名:アメリカ合衆国  

  • “Achievement of Extremely High Current Density of 6635A/cm2 Using a Phthalocyanine Layer with a Thermally Conductive Substrate” 国際会議

    H. Yamamoto, H. Kasajima, W. Yokoyama, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Anomalous High Density Carrier Injection and Transport over 10,000 A/cm2 into Organic Thin Films and the Conduction Mechanism” 国際会議

    H. Yamamoto, H. Nakanotani, H. Kasajima, W. Yokoyama, H. Sasabe and C. Adachi

    The Fifth International Conference on Electroluminescence of Molecular Materials and Related Phenomena (ICEL-5)  2005年1月 

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    会議種別:口頭発表(一般)  

    開催地:Phoenix   国名:アメリカ合衆国  

  • “Low Damage ITO Formation on an Organic Layer Using a Conical Type Sputtering Module and the High Performance Transparent OLEDs” 国際会議

    H. Yamamoto, T. Oyamada, S. Aoshima, W. Hale, H. Sasabe and C. Adachi

    The Fifth International Conference on Electroluminescence of Molecular Materials and Related Phenomena (ICEL-5)  2005年1月 

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    会議種別:口頭発表(一般)  

    開催地:Phoenix   国名:日本国  

  • “Low damage ITO Formation in Organic LEDs using a Conical Type Sputtering Module” 国際会議

    H. Yamamoto, T. Oyamada, S. Aoshima, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Temperature Dependence of ASE Characteristics of a Bis-styrylbenzene Derivative” 国際会議

    H. Yamamoto, Y. Kawamura, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • High performance OLEDs Based on TADF 招待 国際会議

    Hajime Nakanotani, Daniel Ping-Kuen Tsang, Munetomo Inoue, Kou Yoshida, Jean Charles Ribierre, Taro Furukawa, Katsuyuki Shizu, Hironori Kaji, and ○Chihaya Adachi

    KJF-ICOMEP2016  2016年9月 

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    会議種別:口頭発表(一般)  

    開催地:Fukuoka   国名:日本国  

  • High performance OLEDs Based on TADF 招待 国際会議

    Hajime Nakanotani, Daniel Ping-Kuen Tsang, Munetomo Inoue, Kou Yoshida, Jean Charles Ribierre, Taro Furukawa, Katsuyuki Shizu, Hironori Kaji and ○Chihaya Adachi

    IUMRS-ICEM2016  2016年7月 

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    会議種別:口頭発表(一般)  

    開催地:Singapore   国名:シンガポール共和国  

  • Current Status of High Efficiency OLEDs Based on Delayed Fluorescence 招待 国際会議

    Hajime Nakanotani, Daniel Ping-Kuen Tsang, Munetomo Inoue, Kou Yoshida, Jean Charles Ribierre, Taro Furukawa, Katsuyuki Shizu, Hironori Kaji and ○Chihaya Adachi

    ICSM2016  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:Guangzhou   国名:中華人民共和国  

  • High performance OLEDs Based on TADF 招待 国際会議

    Hajime Nakanotani, Daniel Ping-Kuen Tsang, Munetomo Inoue, Kou Yoshida, Jean Charles Ribierre, Taro Furukawa, Katsuyuki Shizu, Hironori Kaji and ○Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • High performance OLEDs Based on TADF 招待 国際会議

    Hajime Nakanotani, Daniel Ping-Kuen Tsang, Munetomo Inoue, Kou Yoshida, Jean Charles Ribierre, Taro Furukawa, Katsuyuki Shizu, Hironori Kaji and ○Chihaya Adachi

    ICNST2016  2016年4月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • High performance OLEDs Based on TADF 招待 国際会議

    Hajime Nakanotani, Daniel Ping-Kuen Tsang, Munetomo Inoue, Kou Yoshida, Jean Charles Ribierre, Taro Furukawa, Katsuyuki Shizu, Hironori Kaji and ○Chihaya Adachi

    ICNST2016  2016年4月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Prospect for future organic lasers from the aspect of exciton annihilation 招待 国際会議

    Hajime Nakanotani, Munetomo Inoue, Kou Yoshida, Jean Charles Ribierre, Taro Furukawa and ○Chihaya Adachi

    IUMRS-ICEM2016  2016年7月 

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    会議種別:口頭発表(一般)  

    開催地:Singapore   国名:シンガポール共和国  

  • Solvent-free liquid organic semiconductor laser devices 招待 国際会議

    Jean-Charles Ribierre, Li Zhao, Ju-Hyung Kim, Munetomo Inoue, Atula S.D. Sandanayaka, Kou Yoshida, Loic Mager, Stephane Méry, Chantal Andraud and Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • “Ir(ppy)3 Triplet Excited Energy Transfer into Adjacent Hole Transport Layers” 国際会議

    K. Goushi, J. J. Brown, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Energy Transfer and Decay Mechanisms of Iridium-Based Phosphors Doped into a CBP Host” 国際会議

    K. Goushi, M. Shirato, J. J. Brown and C. Adachi

    3rd Chitose International Forum on Photonics Science & Technology(CIST)  2002年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Unusual phosphorescence decay characteristics of Ir(ppy)3 in a solid matrix” 国際会議

    K. Goushi, Y. Kawamura, J. Brooks, J. J. Brown, H. Sasabe and C. Adachi

    Material Research Society (MRS) 2004 Fall Meeting  2004年11月 

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    会議種別:口頭発表(一般)  

    開催地:Boston   国名:アメリカ合衆国  

  • “Temperature Dependence of Phosphorescence Decay Characteristics of Ir(ppy)3 in a Solid Matrix” 国際会議

    K. Goushi, Y. Kawamura, J. Brooks, J. J. Brown, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Ambipolar Field-Effect Transistor Behavior of the CuPc and PTCBI Mixing Layer” 国際会議

    K. Hirata, N. Suganuma, T. Oyamada, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Conductivity and OLED Characteristics of the Four Bases Comprising DNA” 国際会議

    K. Hirata, T. Oyamada, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “3,6-Diarylcarbazole Derivatives as an Efficient Host Material in Organic Electrophosphorescent Diodes” 国際会議

    K. Muneuchi, Y. Kawamura, M. Torii, M. Sasaki, H. Sasabe and C. Adachi

    4th Chitose International Forum on Photonics Science & Technology(CIST)  2003年12月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • “Fluorescence Lifetime and Fluorescence spectra of Telaporfinum in Cancer Cells” 国際会議

    K. Noda, R. Shirogane, K. Kodama, C. Adachi, K. Aizawa and L. Li

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • Vacuum Co-deposition Synthesis of Ytterbium Complex for Infrared Organic Light-Emitting Diodes 国際会議

    Kazuya Jinnai, Ryota Kabe, and Chihaya Adachi

    XXth International Krutyn Summer School 2016  2016年5月 

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    会議種別:口頭発表(一般)  

    開催地:Krutyn   国名:ポーランド共和国  

  • “Carrier Transport Properties of Aryl-substituted Heterocycle Compounds and their Electroluminescence Characteristics in Blue OLED” 国際会議

    Kyung Soo Son, Kenichi Goushi, Masayuki Yahiro, Toshiro Imai, Hiroki Yoshizaki and Chihaya Adachi

    2nd International symposium of Functional Innovation of Molecular Informatics  2006年11月 

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    会議種別:口頭発表(一般)  

    開催地:Fukuoka   国名:日本国  

  • “Features of electroluminescence of new blue poly(9,9-dioctylfluorenyl-2,7-diyl)-end capped with polyhedral oligomeric silsesquioxanes” 国際会議

    L. Fenenko, C. Adachi, Y. Nakanishi, P. Smertenko and S. Svechnikov

    ICEPOM-6  2006年9月 

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    会議種別:口頭発表(一般)  

    開催地:Gurzuf   国名:ウクライナ  

  • “High Efficiency Fluorescence Materials having Phenylene Vinylene and Ethynylene Units and Their Application for OLED” 国際会議

    L. Fenenko, G. Mao, A. Orita, J. Otera, C. Adachi

    The Fourth International Conference on Molecular Electronics and Bioelectronics (M&BE4)  2007年3月 

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    会議種別:口頭発表(一般)  

    開催地:Tokyo   国名:日本国  

  • “Molecular interaction between Alq3 and hole transport materials which enhances non-radiative decay rates”

    L. V. M. Castro, T. Oyamada, Y. Kawamura, M. Anzai, T. Miki, H. Sasabe and C. Adachi

    第65回応用物理学会学術講演会  2004年9月 

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    会議種別:口頭発表(一般)  

    開催地:東北学院大   国名:日本国  

  • Horizontal molecular orientation in solution-processed organic light-emitting diodes 国際会議

    L. Zhao, T. Komino, M. Inoue, J.-H. Kim, ○J.C. Ribierre and C. Adachi

    ICSM2016  2016年6月 

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    会議種別:口頭発表(一般)  

    開催地:Guangzhou   国名:中華人民共和国  

  • Advanced Molecular Design for Blue Thermally Activated Delayed Fluorescence Emitters 招待 国際会議

    Lin-Song Cui, Hiroki Noda, Hiroko Nomura, Yan Geng, Jong Uk Kim, Hajime Nakanotani, ○Chihaya Adachi

    SID2017  2017年5月 

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    会議種別:口頭発表(一般)  

    開催地:Los Angeles  

  • The importance of triplet annihilation on the efficiency of organic electrophosphorescent devices 国際会議

    M. A. Baldo, C. Adachi and S. R. Forrest

    Materials Research Society (1999 Fall meeting)  1999年12月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Boston   国名:アメリカ合衆国  

  • “Peculiar Thickness Dependences of a CuPc Hole Injection Layer in OLED” 国際会議

    M. Yoshida, H. Sasabe and C. Adachi

    The Fifth International Conference on Electroluminescence of Molecular Materials and Related Phenomena (ICEL-5)  2005年1月 

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    会議種別:口頭発表(一般)  

    開催地:Phoenix   国名:日本国  

  • “Hole Injection Mechanism of Dixanthene Derivative in OLED” 国際会議

    M. Yoshida, T. Tsuchida, T. Kurata, M. Ikeda, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

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    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • Towards continuous-wave operation of organic semiconductor lasers 招待 国際会議

    Authors: Atula S. D. Sandanayaka, Toshinori Matsushima, Fatima Bencheikh, Kou Yoshida, Munetomo Inoue, Takashi Fujihara, Kenichi Goushi, Jean-Charles Ribierre, ○Chihaya Adachi

    SPIE2017  2017年8月 

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    会議種別:口頭発表(一般)  

    開催地:San Diego  

  • “High-Efficiency Phosphorescence OLEDs with Cyclic Siloxane Compounds as a Host” 国際会議

    A. Endo, T. Oyamada, Y. Kawamura, J. Brooks, J. J. Brown, H. Sasabe and C. Adachi

    5th Chitose International Forum on Photonics Science & Technology(CIST)  2004年10月 

     詳細を見る

    会議種別:口頭発表(一般)  

    開催地:Chitose   国名:日本国  

  • Continuous-Wave Lasing from Organic Thin Films 招待 国際会議

    A. S. D. Sandanayaka, ○T. Matsushima, F. Bencheikh, K. Yoshida, M. Inoue, T. Fujihara, K. Goushi, J.-C. Ribierre, C. Adachi

    KJF-ICOMEP 2017  2017年8月 

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    会議種別:口頭発表(一般)  

    開催地:Gwangju  

  • Control of excitonic processes in organic semiconductors aimed for high performance Organic optoelectronic devices 招待 国際会議

    Atula S. D. Sandanayaka, ○Fatima Bencheikh, Jean-Charles Ribierre, Chuanjiang Qin, Toshinori Matsushima, Hajime Nakanotani and Chihaya Adachi

    IWNBP2017  2017年9月 

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    会議種別:口頭発表(一般)  

    開催地:Vogüé   国名:フランス共和国  

  • Control of excitonic processes in organic semiconductors aimed for high performance OLEDs and organic lasers 招待 国際会議

    Atula S. D. Sandanayaka, Jean-Charles Ribierre, Fatima Bencheikh, Toshinori Matsushima, Kenichi Goushi, Hajime Nakanotani, and ○Chihaya Adachi

    OP2017  2017年6月 

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    会議種別:口頭発表(一般)  

    開催地:Québec   国名:カナダ  

  • Continuous-Wave and Quasi-Continuous-Wave Organic Thin-Film Distributed Feedback Lase 招待 国際会議

    Atula S. D. Sandanayaka, Kou Yoshida, Munetomo Inoue, Chuanjiang Qin, Kenichi Goushi, Jean-Charles Ribierre, Toshinori Matsushima, Chihaya Adachi

    ICNST2016  2016年4月 

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    会議種別:口頭発表(一般)  

    開催地:Sri Lanka   国名:スリランカ民主社会主義共和国  

  • Advanced Organic Electronics by Controlling Precise Charge Transfer Phenomena

    安達 千波矢

    University of Toronto 

     詳細を見る

    記述言語:英語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:University of Toronto   国名:カナダ  

▼全件表示

MISC

  • Erratum: Correction to " 'Core-Shell' Wave Function Modulation in Organic Narrowband Emitters" (Journal of the American Chemical Society (2024) 146 27 DOI: 10.1021/jacs.4c02598)

    Hayakawa M., Tang X., Ueda Y., Eguchi H., Kondo M., Oda S., Fan X.C., Iswara Lestanto G.N., Adachi C., Hatakeyama T.

    Journal of the American Chemical Society   146 ( 34 )   2024年8月

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    出版者・発行元:Journal of the American Chemical Society  

    DOI: 10.1021/jacs.4c09496

    Scopus

  • Materials Design of Organic Lasers Aimed at Low Lasing Threshold 査読

    @Chihaya Adachi, @Atula S. D. Sandanayaka, @Sahar Alasvand Yazdani, @Masashi Mamada, @Toshinori Matsushima, @

    有機合成化学協会誌   2022年11月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • Erratum: Numerical Study of Triplet Dynamics in Organic Semiconductors Aimed for the Active Utilization of Triplets by TADF under Continuous-Wave Lasing (J. Phys. Chem. Lett. (2022) 13:5 (1323−1329) DOI: 10.1021/acs.jpclett.1c03983)

    Abe A., Goushi K., Sandanayaka A.S.D., Komatsu R., Fujihara T., Mamada M., Adachi C.

    Journal of Physical Chemistry Letters   13   2022年

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    出版者・発行元:Journal of Physical Chemistry Letters  

    I n our paper, eq 9 is described as below (Formula Presented). However, the correct equation is (Formula Presented). It should not include the Avogadro constant. All calculations in our paper were conducted with the correct formula, the conclusion is not changed.

    DOI: 10.1021/acs.jpclett.2c01487

    Scopus

  • 4CzIPNドープ薄膜における光生成電荷の再結合緩和

    河崎広空, 宮本直弥, 小林隆史, 小林隆史, 永瀬隆, 永瀬隆, 合志憲一, 合志憲一, 合志憲一, 安達千波矢, 安達千波矢, 安達千波矢, 内藤裕義, 内藤裕義

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   69th   2022年   ISSN:2436-7613

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  • Advanced Organic Laser System Having Triplet Scavengers 査読

    @Buddhika S.B. KARUNATHILAKA, @Umamahesh BALIJAPALLI, @Toshinori MATSUSHIMA, @Atula S.D. SANDANAYAKA, @Chihaya ADACHI

    J-STAGE   2021年12月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: https://doi.org/10.11370/isj.60.615

  • Mini-Review on Efficiency and Stability of Perovskite Solar Cells with Spiro-OMeTAD Hole Transport Layer: Recent Progress and Perspectives 査読

    @Ganbaatar Tumen-Ulzii, @Toshinori Matsushima, @Chihaya Adachi

    Energy & Fuels   2021年9月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: https://doi.org/10.1021/acs.energyfuels.1c02190

  • Thermally-activated Delayed Fluorescence for Light-emitting Devices 査読

    Hajime Nakanotani; Youichi Tsuchiya; Chihaya Adachi

    Chemistry Letters   2021年1月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: https://doi.org/10.1246/cl.200915

  • 有機半導体レーザー分子の耐久特性の向上 査読

    安達 千波矢, 儘田 正史, 松島 敏則

    表面と真空   2021年1月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: https://doi.org/10.1380/vss.64.4

  • The leap from organic light-emitting diodes (OLEDs) to organic semiconductor laser diodes (OSLDs) 査読

    Chihaya Adachi; Atula S. D. Sandanayaka

    CCS Chemistry   2020年8月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: https://doi.org/10.31635/ccschem.020.202000327

  • ペロブスカイト材料の発光デバイスへの応用 査読

    松島 敏則、シン センコウ、ライデン マシュー、安達 千波矢

    光学   2019年3月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 有機薄膜導波路からの擬CWレーザー発振 査読

    安達 千波矢

    応用物理   2018年6月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 有機蓄光の発見 査読

    嘉部 量太、安達 千波矢

    現代化学   2018年3月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • OLED発光材料の新展開

    安達千波矢

    光技術コンタクト   2018年3月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 有機半導体光導波路からの擬CWレーザー発振

    安達千波矢

    レーザー研究   2018年1月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • Deep-blue light emission with a wide-bandgap naphthalene-derivative liquid organic semiconductor host

    Naofumi Kobayashi, Hiroyuki Kuwae, Juro Oshima, Ishimatsu Ryoichi, Shuya Tashiro, Toshihiko Imato, Shuichi Shoji, Jun Mizuno

    The Organic Photonic Materials and Devices XIX conference   2017年3月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • Organic Light-Emitting Diodes (OLEDs): Materials, Photophysics, and Device Physics 査読

    Chihaya Adachi, Saeyoun Lee, Tetsuya Nakagawa, Katsuyuki Shizu, Kenichi Goushi, Takuma Yasuda, William J. Potscavage Jr.

    Organic Electronics Materials and Devices   2015年9月

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    記述言語:その他   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: https://doi.org/10.1007/978-4-431-55654-1_2

  • Physics of Organic Semiconductors

    CHIHAYA ADACHI, Wolfgang Brütting

    Wiley-VCH   2012年12月

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    記述言語:英語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 有機半導体のエネルギーレベルの制御

    安達千波矢、合志憲一

    光アライアンス、日本工業出版   2012年4月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 有機半導体のエネルギーレベルの制御 ―新しい発光機構に基づく高効率発行デバイスの創製へ―

    中川哲也、安達千波矢

    月刊ファインケミカル、シーエムシー出版   2012年2月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 有機ELにおける新しいリン光性発光材料―直線状白金(II)錯体の水平方向と高い光取出し効率の実現へ―

    種田将嗣、安達千波矢

    高圧ガス、高圧ガス保安協会(KHK)   2011年9月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 有機発光デバイスの新展開―新発光機構と次世代「有機EL」の高効率化に貢献する超発光材料―

    安達千波矢

    月刊マテリアルズステージ、株式会社 技術情報協会   2011年8月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 有機トランジスタの基礎―材料科学の基礎

    八尋 正幸、加藤 拓司、池田 征明、安田 琢麿、中野谷 一、 松波 成行、安達 千波矢

    シグマ アルドリッチ ジャパン株式会社   2011年8月

  • 大型ディスプレイに向けた有機EL技術の将来展望

    松波 成行、安達 千波矢

    有機EL最前線、日経BP社   2011年6月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 大きな発展期を迎えた有機光エレクトロニクス―中核デバイスとしての有機EL素子―[特集1]ノーベル化学賞と世界化学年―21世紀化学の夢―

    安達 千波矢

    学術の動向、日本学術協力財団   2011年5月

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    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 特集1:有機半導体とプリンタブルエレクトロニクス

    久保田 是史、合志 憲一、八尋 正幸、安達 千波矢

    月刊ディスプレイ   2010年5月

     詳細を見る

    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 有機発光トランジスタ―新しい有機発光デバイスの展開―(特集 注目される有機EL膜とその応用)

    中野谷 一、安達 千波矢

    光技術コンタクト   2010年2月

     詳細を見る

    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 有機EL素子の基礎及びその作成技術

    八尋 正幸、安達 千波矢

    材料化学の基礎―Material Matters Basics   2009年4月

  • 高次構造制御による有機発光デバイスの高性能化

    中野谷 一

    クリーンテクノロジー   2009年4月

  • アモルファス有機薄膜の分子配向と低しきい値レーザー素子への応用

    横山 大輔、安達 千波矢

    機能材料   2009年4月

  • 金属錯体の特異な光物性とOLEDへの応用

    安達 千波矢、遠藤 礼隆

    高分子   2009年4月

  • 有機ELの新たな可能性に向けて

    安達 千波矢

    電子材料   2009年4月

  • Organic Semiconductor Laser Materials

    Chihaya Adachi and Hajime Nakanontani

    Material Matters   2009年4月

  • 光電エネルギー変換半導体の産業生態系養生に向けて

    安達 千波矢、八尋 正幸、米田 清、菰田 卓哉、赤星 治、金澤 洋平、近藤 信一

    機械工業経済研究報告書/財団法人 機械振興協会 経済研究所   2009年3月

     詳細を見る

    記述言語:日本語   掲載種別:機関テクニカルレポート,技術報告書,プレプリント等  

  • [特集] エネルギー化学材料・電池の現状と将来 Part 1 有機系太陽電池と関連材料 「有機半導体」

    八尋 正幸、安達 千波矢

    (株)エヌ・ティー・エス   2008年5月

     詳細を見る

    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • 脱・Siテクノロジー!!電子デバイスの世界を広げる有機半導体材料の可能性

    安達千波矢

    化学同人   2007年10月

  • 第124委員会結晶工学分科会研究報告

    田中克,安達千波矢

    電子材料   2006年7月

     詳細を見る

    記述言語:日本語   掲載種別:機関テクニカルレポート,技術報告書,プレプリント等  

  • 有機半導体講習会報告

    安達千波矢

    電子材料   2002年11月

     詳細を見る

    記述言語:日本語   掲載種別:機関テクニカルレポート,技術報告書,プレプリント等  

▼全件表示

産業財産権

特許権   出願件数: 734件   登録件数: 299件
実用新案権   出願件数: 0件   登録件数: 0件
意匠権   出願件数: 0件   登録件数: 0件
商標権   出願件数: 0件   登録件数: 0件

所属学協会

  • IEEE

  • SPIE

  • MRS

  • ACS

  • SID

  • 電気学会

  • 日本化学会

  • 高分子学会

  • 応用物理学会

  • 光化学協会

  • 日本学術協力財団

  • 日本工学アカデミー

  • 日本物理学会

  • 有機合成化学協会

  • 有機エレクトロニクス材料研究会

  • 有機EL討論会

  • 有機デバイス研究会

  • 日本表面真空学会

  • 蛍光体同学会

▼全件表示

委員歴

  • 応用物理学会   副会長   国際

    2024年3月 - 2026年3月   

  • 高分子学会   運営委員   国内

    2022年4月 - 2024年3月   

  • 高分子学会   有機エレクトロニクス研究会第36期運営委員   国内

    2022年4月 - 2024年3月   

  • 九州大学   九州大学 応用化学部門 部門長  

    2021年4月 - 2022年3月   

      詳細を見る

  • 九州大学   工学紀要編集委員会  

    2018年4月 - 2020年3月   

  • 光化学協会   理事   国内

    2018年4月 - 2020年3月   

  • 九州大学   人事連絡委員  

    2016年4月 - 2018年3月   

  • 有機エレクトロニクス材料研究会   会長   国内

    2016年3月 - 2020年3月   

  • 有機EL討論会   運営委員長   国内

    2015年4月 - 2020年3月   

  • 九州大学   応用化学部門 部門長  

    2015年4月 - 2016年3月   

  • 日本学術会議   連携会員   国内

    2014年10月 - 2020年9月   

  • 九州大学   国際連携委員会  

    2013年4月 - 2015年3月   

  • 九州大学   研究企画委員会  

    2010年 - 2012年3月   

  • 有機エレクトロニクス材料研究会   会長   国内

    2008年5月 - 2021年5月   

  • (財)光産業技術振興協会(光協会)   調査委員  

    2007年4月 - 2021年4月   

      詳細を見る

    団体区分:学協会

  • 九州大学   伊都地区 環境対策WG  

    2006年4月   

      詳細を見る

    団体区分:その他

    researchmap

▼全件表示

学術貢献活動

  • 学術論文等の審査

    役割:査読

    2023年

     詳細を見る

    種別:査読等 

    外国語雑誌 査読論文数:100

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:250

    国内会議録 査読論文数:0

  • 主催者 国際学術貢献

    7th International TADF Workshop  ( オンライン ) 2022年12月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長 国際学術貢献

    28. Lecture Conference on Photochemistry  ( Düsseldorf ) 2022年9月

     詳細を見る

    種別:大会・シンポジウム等 

  • 学術論文等の審査

    役割:査読

    2022年

     詳細を見る

    種別:査読等 

    外国語雑誌 査読論文数:100

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:250

    国内会議録 査読論文数:0

  • 主催者 国際学術貢献

    6th International TADF Workshop  ( オンライン ) 2021年12月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長 国際学術貢献

    SPIE Optics + Photonics 2021  ( オンライン ) 2021年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長 国際学術貢献

    SID Display Week 2021  ( オンライン ) 2021年5月

     詳細を見る

    種別:大会・シンポジウム等 

  • 学術論文等の審査

    役割:査読

    2021年

     詳細を見る

    種別:査読等 

    外国語雑誌 査読論文数:50

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:250

    国内会議録 査読論文数:0

  • 共催 国際学術貢献

    3rd i3-opera Forum  ( オンライン ) 2020年12月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:247

  • 主催者 国際学術貢献

    5th International TADF Workshop  ( オンライン ) 2020年12月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:247

  • 座長 国際学術貢献

    SPIE Optics + Photonics 2020  ( オンライン ) 2020年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長 国際学術貢献

    SID Display Week 2020  ( オンライン ) 2020年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 学術論文等の審査

    役割:査読

    2020年

     詳細を見る

    種別:査読等 

    外国語雑誌 査読論文数:50

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:250

    国内会議録 査読論文数:0

  • 共催 国際学術貢献

    第35回(2019)京都賞記念ワークショップ  ( 九州大学 稲盛財団記念館 ) 2019年11月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:100

  • 共催 国際学術貢献

    2nd i3-opera Forum  ( 九州大学 伊都キャンパス イーストゾーン 大講義室2 ) 2019年8月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:200

  • 主催者

    4th International TADF Workshop  ( 九州大学 伊都キャンパス イーストゾーン 大講義室2 ) 2019年8月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:200

  • 座長 国際学術貢献

    SPIE Optics + Photonics 2019  ( San Diego Convention Center UnitedStatesofAmerica ) 2019年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長 国際学術貢献

    SID Display Week 2019  ( San Jose McEnery Convention Center UnitedStatesofAmerica ) 2019年5月

     詳細を見る

    種別:大会・シンポジウム等 

  • 学術論文等の審査

    役割:査読

    2019年

     詳細を見る

    種別:査読等 

    外国語雑誌 査読論文数:50

    日本語雑誌 査読論文数:0

    国際会議録 査読論文数:250

    国内会議録 査読論文数:0

  • 座長 国際学術貢献

    SPIE Optics + Photonics 2018  ( San Diego Convention Center UnitedStatesofAmerica ) 2018年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 主催者 国際学術貢献

    3rd International TADF Workshop  ( 福岡市東区(ホテル・ルイガンズ) ) 2018年7月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:200

  • 共催 国際学術貢献

    i3-opera Forum  ( 福岡市東区(ホテル・ルイガンズ) ) 2018年7月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:200

  • CCS Chemistry 国際学術貢献

    2018年6月 - 現在

     詳細を見る

    種別:学会・研究会等 

  • 座長(Chairmanship) 国際学術貢献

    SPIE Organic Photonics + Electronics  ( San Diego UnitedStatesofAmerica ) 2017年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • Co-Chair 国際学術貢献

    SPIE  ( UnitedStatesofAmerica ) 2017年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • Chair 国際学術貢献

    2nd International TADF Workshop  ( 九州大学 伊都キャンパス ) 2017年7月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    SPIE Organic Photonics + Electronics  ( San Diego UnitedStatesofAmerica ) 2016年8月 - 2016年9月

     詳細を見る

    種別:大会・シンポジウム等 

  • Co-Chair 国際学術貢献

    SPIE  ( UnitedStatesofAmerica ) 2016年8月 - 2016年9月

     詳細を見る

    種別:大会・シンポジウム等 

  • Organizer 国際学術貢献

    MRS Spring 2016  ( Phoenix UnitedStatesofAmerica ) 2016年3月 - 2016年4月

     詳細を見る

    種別:大会・シンポジウム等 

  • Organizer 国際学術貢献

    MRS Spring MTG  ( Phoenix UnitedStatesofAmerica ) 2016年3月 - 2016年4月

     詳細を見る

    種別:大会・シンポジウム等 

  • Organizer 国際学術貢献

    Pacifichem  ( Hawaii UnitedStatesofAmerica ) 2015年12月

     詳細を見る

    種別:大会・シンポジウム等 

  • Organizer 国際学術貢献

    Pacifichem2015  ( Hawaii UnitedStatesofAmerica ) 2015年12月

     詳細を見る

    種別:大会・シンポジウム等 

  • 不明 国際学術貢献

    MOC'15  ( Fukuoka Japan ) 2015年10月

     詳細を見る

    種別:大会・シンポジウム等 

  • Organizer 国際学術貢献

    MOC'15  ( Fukuoka Japan ) 2015年10月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    SPIE Optics+Photonics 2014  ( UnitedStatesofAmerica ) 2014年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    SPIE Photonics Europe 2014  ( Belgium ) 2014年4月

     詳細を見る

    種別:大会・シンポジウム等 

  • Chair 国際学術貢献

    2014 TADF WORKSHOP  ( アクロス福岡 ) 2014年3月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    SPIE Photonics West  ( Moscone Center, San Francisco UnitedStatesofAmerica ) 2013年2月

     詳細を見る

    種別:大会・シンポジウム等 

  • chair 国際学術貢献

    ICEL 2012  ( ホテル・ルイガンズ ) 2012年9月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:300

  • 座長(Chairmanship) 国際学術貢献

    SPIE Organic Photonics + Electronics  ( San Diego, California UnitedStatesofAmerica ) 2012年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    The 14thAsian Chemical Congress 2011  ( Bangkoko Thailand ) 2011年9月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    SPIE Optics + Photonics  ( San Diego, California UnitedStatesofAmerica ) 2011年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    International Workshop on Organic Composite Optoelectronic Materials and Devices 2011  ( Weihai, Shandong China ) 2011年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    International Workshop on Organic Composite Optoelectronic Materials and Devices 2011  ( Weihai, Shandong China ) 2011年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 運営委員

    高分子学会有機エレクトロニクス研究会  ( 東京都千代田区 ) 2011年7月

     詳細を見る

    種別:大会・シンポジウム等 

  • Chair 国際学術貢献

    OPERA WINTER SCHOOL 2011  ( 九州大学 稲盛財団記念館 ) 2011年1月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:150

  • 主催者

    OPERA クリスマスサイエンスレクチャー  ( 福岡県福岡市(さいとぴあ ) 2010年12月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:150

  • 座長(Chairmanship) 国際学術貢献

    SPIE 2010  ( Sandiego Convention Center, California UnitedStatesofAmerica ) 2010年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    2009 MRS fall Meeting  ( Boston, USA(John B. Hynes Convention Center) UnitedStatesofAmerica ) 2009年11月 - 2009年12月

     詳細を見る

    種別:大会・シンポジウム等 

  • 主催 国際学術貢献

    First Asian Conference on Organic Electronics(A-COE)  ( 福岡県福岡市(ザ・ルイガンズ) ) 2009年9月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:120

  • 座長(Chairmanship) 国際学術貢献

    The SPIE Optics+Photonics 2009  ( California(San Diego Convention Center) UnitedStatesofAmerica ) 2009年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • 実行委員 国際学術貢献

    第3回韓国Yeungnam大学-九州大学ジョイントシンポジウム  ( 九州大学 伊都キャンパス ) 2008年12月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:50

  • 主査

    学術振興会142C委員会第30回特別研究会  ( 門司港ホテル ) 2008年11月

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:50

  • 座長(Chairmanship) 国際学術貢献

    7th International Conference Electroluminescence of Molecular Materials and Related Phenomena  ( Dresden Germany ) 2008年9月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    SPIE optics and photonics  ( San Diego Convention Cener, California UnitedStatesofAmerica ) 2008年8月

     詳細を見る

    種別:大会・シンポジウム等 

  • プログラム委員会 国際学術貢献

    SPIE Photonics Europe  ( Paras de la Musique et des Congres France ) 2008年4月

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship)

    日本化学会第87春期年会  ( 関西大学 ) 2007年3月 - 現在

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship) 国際学術貢献

    IDW'06 The 13th International Display Workshops  ( 大津プリンスホテル ) 2006年12月 - 現在

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship)

    2006年日本化学会西日本大会  ( 琉球大学 ) 2006年11月 - 現在

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship)

    第55回高分子討論会  ( 富山大学 ) 2006年9月 - 現在

     詳細を見る

    種別:大会・シンポジウム等 

  • 座長(Chairmanship)

    有機EL討論会 第2回例会  ( 日本科学未来館 みらいCANホール(東京、お台場) ) 2006年5月 - 現在

     詳細を見る

    種別:大会・シンポジウム等 

  • 実行委員会 Secretary General 国際学術貢献

    千歳科学技術大学 (北海道千歳市)  ( 千歳科学技術大学 (北海道千歳市) ) 2003年12月 - 現在

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:100

  • 実行委員

    CIF4 Satellite Symposium on Device Physics of Organic Semiconductor Devices  ( ホテルニドム (北海道苫小牧市) ) 2003年12月 - 現在

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:50

  • 実行委員会 Secretary General 国際学術貢献

    3rd Chitose International Forum on Photonics Science and Technology  ( 千歳科学技術大学 (北海道千歳市) ) 2002年9月 - 現在

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:150

  • シンポジウム事務局代表

    情報科学用有機材料第142委員会30周年記念シンポジウム  ( ホテル日航千歳 (北海道千歳市) )

     詳細を見る

    種別:大会・シンポジウム等 

    参加者数:70

▼全件表示

共同研究・競争的資金等の研究課題

  • 青色OLEDのためのMR型及びCT型TADF構造の複合による逆系間交差の高速化

    研究課題/領域番号:24KF0245  2024年11月 - 2027年3月

    科学研究費助成事業  特別研究員奨励費

    安達 千波矢, BARMAN DEBASISH

      詳細を見る

    資金種別:科研費

    CiNii Research

  • ハイブリッド2Dペロブスカイトの超分子pドーピングによる多機能材料の開発

    研究課題/領域番号:24KF0118  2024年7月 - 2027年3月

    科学研究費助成事業  特別研究員奨励費

    安達 千波矢, MALL HAIDARALY KEVIN

      詳細を見る

    資金種別:科研費

    This research project aims at the development of highly oriented 2D halide perovskite with exalted electric condutction properties. Consequently, this multidisciplinary project will be articulated on the design, synthesis, characterization and application of such newly developed materials.

    CiNii Research

  • 熱活性化遅延蛍光分子における逆系間交差過程の解明と先進TADF分子の創出

    研究課題/領域番号:23KF0263  2023年11月 - 2026年3月

    科学研究費助成事業  特別研究員奨励費

    安達 千波矢, KIM HYUNG SUK

      詳細を見る

    資金種別:科研費

    We will propose a comprehensive TADF model that incorporates a four-level electronic structure to fully account for the observed experimental responses in our study. This model will take into consideration the spin-flip process facilitated by an intermediate, high-lying T state. It will be constructed based on the principles of universal exciton dynamics using time-dependent population rate equations. This approach will provide us with a better understanding of the underlying spin-flip mechanisms.

    CiNii Research

  • 先端材料化学と量子物性物理の融合による量子分子エレクトロニクスの創製 Creation of quantum molecular electronics by fusion of advanced materials chemistry a nd quantum solid-state physics

    研究課題/領域番号:23K20039  2023年 - 2029年

    日本学術振興会  科学研究費助成事業  国際先導研究

      詳細を見る

    担当区分:研究代表者  資金種別:科研費

  • 低閾値発振を目指した電流励起有機半導体レーザーの構築

    研究課題/領域番号:23H05406  2023年 - 2027年

    日本学術振興会  科学研究費助成事業  特別推進研究

      詳細を見る

    担当区分:研究代表者  資金種別:科研費

  • JSPS 二国間交流事業 国際共著

    2022年6月 - 2023年3月

    Indian Institute of Technology Madras(インド) 

      詳細を見る

    担当区分:研究代表者 

    成膜に近接空間蒸着法を用いて作製した多層OLEDの耐久特性の向上

  • JSPS 研究拠点形成事業(A.先端拠点形成型) 国際共著

    2018年4月 - 2023年3月

    英国、オーストラリア、フランス、ドイツ 

      詳細を見る

    担当区分:研究代表者 

    TADF(熱活性化遅延蛍光材料)の技術を基軸に量子化学計算から高速光物性解析、デバイス物性までの包括的な国際研究実施体制を構築する。

  • 地域イノベーション・エコシステム形成プログラム

    2016年11月 - 2021年3月

      詳細を見る

    担当区分:研究分担者 

    TV/スマホ/照明等用途向発光材料及びデバイスの高耐久性に向けた製造プロセスに係るプロジェクト、第三世代の有機EL発光材料を核とした事業化プロジェクトを展開している。加えて、福岡県の研究機関を中心に、企業との共同研究や産学官による実用化研究を行う。

  • エネルギー・環境新技術先導プログラム

    2015年2月 - 2016年2月

      詳細を見る

    担当区分:研究代表者 

  • JST ERATO 安達分子エキシトン工学プロジェクト

    2013年12月 - 2020年3月

      詳細を見る

    担当区分:研究代表者 

  • 持続的共進化地域創成拠点

    2013年11月 - 2018年3月

      詳細を見る

    担当区分:研究分担者 

  • 次世代グリーン・イノベーション評価基盤技術開発プロジェクト

    2010年4月 - 2013年3月

      詳細を見る

    担当区分:研究分担者 

  • 先端研究助成基金助成金 最先端研究開発支援プログラム

    2009年3月 - 2013年3月

    独立行政法人 日本学術振興会(日本) 

      詳細を見る

    担当区分:研究代表者 

    スーパー有機ELデバイスとその革新的材料への挑戦

  • 異分野融合型次世代デバイス製造技術開発プロジェクト

    2008年7月 - 2013年3月

    NEDO(独立行政法人 新エネルギー・産業技術総合開発機構) 

      詳細を見る

    担当区分:研究代表者 

  • 科学技術振興調整費 産学官共同研究の効果的な推進 フレキシブル・ユビキタス端末の実現

    2006年4月 - 2008年3月

      詳細を見る

    担当区分:研究分担者 

    発光性有機トランジスターに関する研究開発

▼全件表示

教育活動概要

  • 学部基礎教育:量子化学第二、物理化学第二
    大学院:有機光エレクトロニクス

担当授業科目

  • 量子化学

    2023年12月 - 2024年2月   冬学期

  • 有機光エレクトロニクス

    2023年10月 - 2024年3月   後期

  • 物理化学第二

    2023年10月 - 2023年12月   秋学期

  • 量子化学第二

    2023年6月 - 2023年8月   夏学期

  • 分子システムデバイス講究

    2023年4月 - 2024年3月   通年

  • 有機光エレクトロニクス

    2022年10月 - 2023年3月   後期

  • 物理化学第二

    2022年10月 - 2022年12月   秋学期

  • 量子化学第二

    2022年6月 - 2022年8月   夏学期

  • 分子システムデバイス講究

    2022年4月 - 2023年3月   通年

  • 有機光エレクトロニクス

    2021年10月 - 2022年3月   後期

  • 物理化学第二

    2021年10月 - 2021年12月   秋学期

  • 量子化学第二

    2021年6月 - 2021年8月   夏学期

  • 分子システムデバイス講究

    2021年4月 - 2022年3月   通年

  • 有機光エレクトロニクス

    2020年10月 - 2021年3月   後期

  • 物理化学第二

    2020年10月 - 2020年12月   秋学期

  • 量子化学第二

    2020年6月 - 2020年8月   夏学期

  • 分子システムデバイス講究

    2020年4月 - 2021年3月   通年

  • 有機エレクトロニクス

    2019年10月 - 2020年3月   後期

  • 物理化学第二

    2019年10月 - 2020年3月   後期

  • (IUPE)Physical Chemistry B

    2019年10月 - 2019年12月   秋学期

  • 量子化学第二

    2019年6月 - 2019年8月   夏学期

  • 分子システムデバイス講究

    2019年4月 - 2020年3月   通年

  • 機能設計化学講究B

    2019年4月 - 2020年3月   通年

  • 量子化学第二

    2019年4月 - 2019年9月   前期

  • 有機エレクトロニクス

    2018年10月 - 2019年3月   後期

  • 物理化学第二

    2018年10月 - 2019年3月   後期

  • 量子化学第二

    2018年4月 - 2018年9月   前期

  • 物理化学第二

    2017年10月 - 2018年3月   後期

  • 量子化学第二

    2017年4月 - 2017年9月   前期

  • 有機エレクトロニクス

    2016年10月 - 2017年3月   後期

  • 量子化学第二

    2016年4月 - 2016年9月   前期

  • 化学英語

    2015年10月 - 2016年3月   後期

  • 物理化学B

    2015年10月 - 2016年3月   後期

  • 有機光エレクトロニクス

    2014年10月 - 2015年3月   後期

  • 電磁気学

    2014年4月 - 2014年9月   前期

  • 有機光エレクトロニクス

    2011年10月 - 2012年3月   後期

  • 電磁気学

    2011年4月 - 2011年9月   前期

  • 有機物理化学

    2009年10月 - 2010年3月   後期

  • 電磁気学基礎

    2009年4月 - 2009年9月   前期

  • 電磁気学基礎

    2008年4月 - 2008年9月   前期

  • 電磁気基礎

    2007年4月 - 2007年9月   前期

  • 有機光エレクトロニクス

    2006年10月 - 2007年3月   後期

▼全件表示

FD参加状況

  • 2019年3月   役割:参加   名称:学部・研究科等の枠を超えた学位プログラムに関するFD

    主催組織:全学

他大学・他機関等の客員・兼任・非常勤講師等

  • 2023年  National Taipei University of Technology・The college of Electrical Engineering and Computer Science  区分:客員教員  国内外の区分:国外 

    学期、曜日時限または期間:2023.8.1~2025.7.31

  • 2019年  理化学研究所 独創的研究課題「物質階層原理研究」&「ヘテロ界面研究」の合同春合宿  区分:集中講義  国内外の区分:国内 

    学期、曜日時限または期間:2019.5.10~5.11

  • 2018年  東京理科大学 総合研究員(先進農業エネルギー理工学研究部門)  区分:客員教員  国内外の区分:国内 

    学期、曜日時限または期間:2018.4.1~2019.3.31

  • 2018年  名古屋大学 第24回名古屋メダルセミナーでの講演会  区分:集中講義  国内外の区分:国内 

    学期、曜日時限または期間:2019.2.28

  • 2018年  開拓研究本部Kim表面界面科学研究室において客員主管研究員として「エネルギー移動変換における分子レベル研究」を行う。  区分:客員教員  国内外の区分:国内 

    学期、曜日時限または期間:2018.4.1~2025.3.31

  • 2017年  群馬大学大学院理工学府長  区分:集中講義  国内外の区分:国内 

    学期、曜日時限または期間:2015.12.4-12.5

  • 2017年  京都大学  区分:集中講義  国内外の区分:国内 

  • 2015年  千歳科学技術大学  区分:集中講義  国内外の区分:国内 

    学期、曜日時限または期間:2015.9.30

  • 2010年  京都大学化学研究所  区分:非常勤講師  国内外の区分:国内 

    学期、曜日時限または期間:平成22年4月1日~平成23年3月31日

  • 2010年  福岡県立城南高等学校  国内外の区分:国内 

    学期、曜日時限または期間:平成22年11月~平成23年3月31日

  • 2009年  京都大学工学部  区分:集中講義  国内外の区分:国内 

    学期、曜日時限または期間:平成21年2月

  • 2009年  北陸先端科学技術大学院大学 マテリアルサイエンス研究科  区分:集中講義  国内外の区分:国内 

    学期、曜日時限または期間:平成21年5月29日(金) 15時30分~17時00分

  • 2006年  京都大学工学部  区分:非常勤講師  国内外の区分:国内 

    学期、曜日時限または期間:集中

  • 2006年  千歳科学技術大学光科学部  区分:客員教員  国内外の区分:国内 

    学期、曜日時限または期間:集中

▼全件表示

国際教育イベント等への参加状況等

  • 2022年11月

    クイーンズランド大学の学生に「World leading Research」として有機エレクトロニクスに関する講義、施設見学及び九大大学院生との交流の場を提供した。

    2022 UQ-JPIE (Japan Program for Industry Experience)

      詳細を見る

    開催国・都市名:福岡市西区(九州大学伊都キャンパス)

    参加者数:17

  • 2019年12月

    National Tsing-Hua University

    Taiwan Emergent Functional Matter Science

      詳細を見る

    開催国・都市名:台湾・新竹市

    参加者数:100

  • 2019年11月

    淡江大学

    淡江大学熊猫講座

      詳細を見る

    開催国・都市名:台湾・新北市

    参加者数:200

  • 2019年7月

    IUPAC

    The 47th IUPAC Paris

      詳細を見る

    開催国・都市名:フランス・パリ

    参加者数:100

  • 2019年2月

    Queen's University

    Harrison-MacRae lecture

      詳細を見る

    開催国・都市名:Canada・Kingston

  • 2018年4月

    The French Optical Society

    Excitonics for photonic applications

      詳細を見る

    開催国・都市名:Les Houches, France

  • 2016年6月

    National Chiao Tung University (NCTU)

    2016 The 5th Hsinchu Summer Course and Workshop

      詳細を見る

    開催国・都市名:Hsinchu, Taiwan

  • 2016年4月

    MRS

    2016 MRS Spring Meeting Tutorial Program

      詳細を見る

    開催国・都市名:Arizona, U. S. A.

  • 2014年6月

    IKSS

    15th International Krutyn Summer School 2014

      詳細を見る

    開催国・都市名:Krutyn、Poland

  • 2011年1月

    九州大学グローバルCOE「未来分子システム科学」

    九州大学グローバルCOE「未来分子システム科学」 第17回 国際連携特論

      詳細を見る

    開催国・都市名:福岡県福岡市西区(九州大学 伊都キャンパス 稲盛記念会館)

    参加者数:150

  • 2010年6月

    the FP7 Collaborative Project "OLED100.eu"

    6th International Krutyn Summer School 2010

      詳細を見る

    開催国・都市名:Krutyn, Poland

  • 2009年9月

    the FP7 Collaborative Project "OLED100.eu"

    5th International Kruryn Summer School 2009

      詳細を見る

    開催国・都市名:Krutyn, Poland

▼全件表示

その他教育活動及び特記事項

  • 2008年  その他特記事項  出版社 Elsevier社・九州大学 グローバルCOEプログラム「未来分子システム」共催 「若手研究者のためのAuther Workshop」

     詳細を見る

    出版社 Elsevier社・九州大学 グローバルCOEプログラム「未来分子システム」共催
    「若手研究者のためのAuther Workshop」

社会貢献・国際連携活動概要

  • 海外から著名な先生を講師として招聘し、OPERAセミナーとして、一般参加もできるセミナーを月に1回開催。また、H30年度に採択されたJSPS 研究拠点形成事業A先端拠点形成型(JSPS core to core )プログラムを活用し、海外の学生、研究者と当研究室の学生、研究者の在外研究や、研究交流を深めている。

社会貢献活動

  • 光産業技術振興協会主催「第482回光産業技術マンスリーセミナー」において「OLED-材料・デバイスの進展、そして未来への展開ー」というタイトルにて講演

    光産業技術振興協会  オンライン  2023年7月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 信州大学先鋭領域融合研究群先鋭材料研究所が主宰するRISMセミナーにおいて「OLED-過去・現在・未来へ―」という題目にて講演

    信州大学先鋭領域融合研究群先鋭材料研究所  信州大学(オンライン配信)  2022年6月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • ISIT市民講演会「光る物質の最前線 洗剤から有機ELまで!」講演及び公開実験

    公益財団法人 九州先端科学技術研究所 (ISIT)、福岡市科学館  福岡市科学館  2020年2月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

    一般の中学生を対象として、有機ELに関する講義と分子の発光実験を行った。

  • 九州先端科学技術研究所(ISIT)市民講座「光る物質の最前線 洗剤から有機ELまで!」/有機ELの技術について、公開実験も交え小中学生・一般を対象に講義を行った。

    2020年2月

     詳細を見る

    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 有機EL に関する講義

    福岡県立糸島高校  九州大学伊都キャンパスISI棟  2020年1月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

    福岡県立糸島高校2年生理系特進クラス42名を対象に有機ELに関する講義を行う。

  • アカデミックフェスティバル 内容:本学の同窓生、高校生、地域住民の方々などを対象に本学の“今”の状況を幅広く知っていただく

    九州大学総務部同窓生・基金課  九州大学伊都キャンパス椎木講堂  2019年10月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 有機EL に関する模擬講義

    福岡県立育徳館中学校  九州大学伊都キャンパス椎木講堂  2019年6月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

    福岡県立育徳館中学校3年生119名を対象に有機ELに関する模擬講義を行う。

  • 有機ELに関する模擬講義 (開催場所:九大伊都キャンパス椎木講堂)

    福岡県立育徳館中学校  2019年6月

     詳細を見る

    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 「有機EL」について、体験型展示や解説動画を用いた展示を2019年3月から約2年間の展示を行う。

    福岡市科学館、九州大学、(公財)九州先端科学技術研究所、(公財)福岡県 産業・科学技術振興財団(ふくおかIST)  福岡市科学館5階基本展示室サイエンス&クリエイティブラボ  2019年3月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:その他

  • JST 日本・アジア青少年サイエンス交流事業 さくらサイエンス によりスリランカより11名、中国より11名、モンゴルより4名を招聘した。

    JST 日本・アジア青少年サイエンス交流事業  2017年

     詳細を見る

    JST 日本・アジア青少年サイエンス交流事業 さくらサイエンス によりスリランカより11名、中国より11名、モンゴルより4名を招聘した。

  • Zero to Oneの発想で未来を切り拓こうー無限に広がる新しい分子設計への挑戦と革新的な有機ELデバイスの誕生ー

    河合塾福岡校  河合塾福岡校  2016年10月

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    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 有機ELとは

    佐賀県立唐津東高等学校  2016年7月

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    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 有機発光分子が拓く新しい有機発光材料の登場

    山口県立山口高等学校  2015年12月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 有機ELとは

    佐賀県立唐津東中学校  2015年11月

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    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 有機ELとは

    佐賀県立唐津東中学校  2015年11月

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    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 有機ELの作り方

    熊本県立第二高校 SSH実験・実習体験講座  2015年10月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 科学研究の進め方

    福岡県立戸畑高等学校  福岡県立戸畑高等学校  2015年6月

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    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 有機ELについて

    唐津東中学校  2015年6月

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    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 最先端技術

    福岡県立 城南高校  2015年3月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 分子が拓く新しいエレクトロニクスの世界

    宮崎県立高鍋高校  2014年12月

     詳細を見る

    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 未来を拓く有機光エレクトロニクス

    九州市民大学  2014年7月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 日経BP社主催「有機ELの基礎から将来展望まで」に関する講演(題目:第三世代の有機EL発光材料―熱活性型遅延蛍光材料(TADF)による高効率化の方式)を行った。

    日経BP社  日本化学館  2012年12月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • プラナリゼーションCMP委員会主催「プラナリゼーションCMPとその応用技術専門委員会」第122回研究会において「日本発の新しい有機EL材料の登場」という題目にて講演をおこなった。

    プラナリゼーションCMP委員会  幕張メッセ  2012年12月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:セミナー・ワークショップ

  • フラットパネルディスプレイ展(FPD International in Yokohama 2012)にて次世代FPD/モバイル有機ELに関する基調講演「有機EL発光材料の新展開」を行った。

    FPD International in Yokohama 2012  パシフィコ横浜  2012年11月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 公益社団法人 日本技術士会CPD講演会にて「基礎研究から実用化研究を迎えた有機光エレクトロニクス―中核デバイスとしての有機EL素子」という題目にて講演を行った。

    公益社団法人 日本技術士会  福岡商工会議所ビル  2012年7月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 九州半導体・エレクトロニクスイノベーション協議会(SIIQ)平成24年度総会にて「基礎研究から実用化研究を迎えた有機光エレクトロニクス―中核デバイスとしての有機EL素子」という題目にて講演を行った。

    九州半導体・エレクトロニクスイノベーション協議会(SIIQ)  ハイアットリージェンシー福岡  2012年5月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:セミナー・ワークショップ

  • 第2回 OPERAクリスマスサイエンスレクチャーと題し、中学・高校生向けのサイエンスレクチャーを行った。(講演と実験体)

    2011年12月

     詳細を見る

    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 札幌市立開成高校出張講義(発光分光と光電子放出を使って物質中の電子を探る)

    2011年12月

     詳細を見る

    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 名古屋大学にて「化学への招待―すぐれもの有機材料~有機ELって?~有機化学がつくる新しいエレクトロニクス」と題した講演を行った。

    2011年11月

     詳細を見る

    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 神奈川県横浜市(パシフィコ横浜)にて開催された先端光テクノロジー展2010において、「革新的有機半導体材料を用いた有機発光デバイスへの挑戦」という題目にて、特別招待講演を行った。

    レーザー輸入振興協会  神奈川県横浜市(パシフィコ横浜)  2011年5月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:その他

  • FIRST サイエンスフォーラム ~ トップ科学者と若者で切り拓く未来~ 」  フォーラムに参加する高校生をはじめとする一般市民に向け、最先端の科学技術を紹介し、科学者・技術者を身近に感じてもらうと共に次世代の科学技術を担う人材の裾野の拡大を目的とする。なお、このフォーラムは「ニコニコ動画」でも生中継された。

    独立行政法人 科学技術振興機構 イノベーション推進本部  レ ルミエール (大阪府大阪市)  2011年2月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 福岡県北九州市(北九州学術研究都市会議場)にて開催された、「第10回全九州半導体技術フォーラム」において「未来を拓く有機エレクトロニクス-新しいプラスチックエレクトロニクスの幕開け」という題目にて講演を行った。

    九州半導体イノベーション協議会事務局  福岡県北九州市(北九州学術研究都市会議場)  2010年10月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 福岡県福岡市博多区(ホテルレガロ福岡)にて開催された「ふくおかISTイノベーションクラブ 平成22年度 総会」において、有機光エレクトロニクスの最新動向等について講演を行った。

    (財)福岡県産業・科学技術振興財団  福岡県福岡市博多区(ホテルレガロ福岡)  2010年7月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:セミナー・ワークショップ

  • 平成22年7月28日~7月30日、東京ビックサイト(東京都江東区)にて開催された「第21回マイクロマシン/MEMS展」において、最先端有機光エレクトロニクス研究センターに関するパンフレット配布・説明・スーパー有機ELに関する公開出来る範囲での研究進捗状況等の広報活動を行った。

    財団法人 マイクロマシンセンター  東京都江東区(東京ビックサイト)  2010年7月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:その他

  • シリコンシーベルトサミット福岡2010において、「グリーンデバイスを切り開く有機エレクトロニクス」というタイトルにて招待講演を行った。

    財団法人 福岡県産業・科学技術振興財団  福岡県福岡市(ホテルオークラ福岡)  2009年10月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 化学クラブ生徒を対象にした研修会

    福岡県高等学校化学部会協賛  2008年11月

     詳細を見る

    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 第3回 未来化学創造センターシンポジウム (第4回福岡市産学連携センターセミナー) 伊都キャンパス公開講座~中学生のみなさん、九大学研都市へようこそ~

    九州大学 未来化学創造センター  2008年8月

     詳細を見る

    対象:幼稚園以下, 小学生, 中学生, 高校生

    種別:セミナー・ワークショップ

  • 第3回九州大学学術研究都市情報交流セミナーにて、 有機光エレクトロニクスの登場,基礎から最新技術に関する講演を行った。

    財団法人 九州大学学術研究都市推進機構  ホテルセントラーザ博多  2008年2月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

  • 福岡市公開市民講座にて、有機半導体デバイス(装置)の材料・合成からその物理の解明について基調講演を行った。

    福岡市 新産業課  福岡SRPセンタービル2階(早良区百道浜二丁目1-22)   2007年10月

     詳細を見る

    対象:社会人・一般, 学術団体, 企業, 市民団体, 行政機関

    種別:講演会

▼全件表示

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    九州大・安達教授、有機材料でレーザー、顔認証の光源に活用。

  • 九州大学、厚くても発光する有機EL。

    日本経済新聞  2019年8月

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    九州大学、厚くても発光する有機EL。

  • 九州大学 有機ELを高効率化 金属ペロブスカイトで

    電子デバイス産業新聞  2019年8月

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    九州大学 有機ELを高効率化 金属ペロブスカイトで

  • 九大・JST・キヤノン財団、有機発光層を金属ハライドペロブスカイト層で挟んだ有機ELを開発

    日本経済新聞電子版  2019年7月

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    九大・JST・キヤノン財団、有機発光層を金属ハライドペロブスカイト層で挟んだ有機ELを開発

  • 有機材料で半導体レーザー開発

    科学新聞  2019年6月

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    有機材料で半導体レーザー開発

  • 九大など、有機材料を用いた半導体レーザーダイオードの電流励起発振に成功

    日本経済新聞電子版  2019年5月

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    九大など、有機材料を用いた半導体レーザーダイオードの電流励起発振に成功

  • アイキューブ・オペラ 有機EL評価メニューを拡充 フレキシブル基板や量子ドットも対象に

    電子デバイス産業新聞  2019年4月

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    アイキューブ・オペラ 有機EL評価メニューを拡充 フレキシブル基板や量子ドットも対象に

  • 最先端研究者に「名古屋メダル」 名大で授与式

    中日新聞朝刊  2019年3月

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    最先端研究者に「名古屋メダル」 名大で授与式

  • JSTと九州大学 近赤外の有機EL素子 励起効率100%以上に

    電子デバイス産業新聞  2018年7月

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    JSTと九州大学 近赤外の有機EL素子 励起効率100%以上に

  • 九大、励起子生成効率100%以上を実現する有機EL素子の開発に成功

    日本経済新聞電子版  2018年7月

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    九大、励起子生成効率100%以上を実現する有機EL素子の開発に成功

  • 有機EL、輝度高く、九大、光のもとを効率生成。

    日経産業新聞  2018年7月

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    有機EL、輝度高く、九大、光のもとを効率生成。

  • イベント TADF国際学会 7月に福岡で開催

    電子デバイス産業新聞  2018年5月

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    イベント TADF国際学会 7月に福岡で開催

  • 訪問リポート 有機光エレクトロニクス実用化開発センター 受託研究拡大へ2プロジェクト推進 新蒸着技術の実用化目指す

    電子デバイス産業新聞  2018年4月

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    訪問リポート 有機光エレクトロニクス実用化開発センター 受託研究拡大へ2プロジェクト推進 新蒸着技術の実用化目指す

  • カードボックス=仁科記念賞に九大の安達氏ら3人

    信濃毎日新聞朝刊  2017年12月

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    カードボックス=仁科記念賞に九大の安達氏ら3人

  • 第63回仁科記念賞の受賞者決定

    科学新聞  2017年11月

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    第63回仁科記念賞の受賞者決定

  • 仁科記念賞 武居さんら3名 新聞・雑誌

    朝日新聞  2017年11月

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    仁科記念賞 武居さんら3名

  • 仁科賞に九大安達氏ら 新聞・雑誌

    西日本新聞  2017年11月

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    仁科賞に九大安達氏ら

  • 九大・安達氏らに仁科賞 新聞・雑誌

    産経新聞  2017年11月

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    九大・安達氏らに仁科賞

  • 仁科賞に九大・安達氏ら 有機EL研究に貢献 新聞・雑誌

    日本経済新聞  2017年11月

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    仁科賞に九大・安達氏ら 有機EL研究に貢献

  • 仁科記念賞 3人が受賞

    東京読売新聞朝刊  2017年11月

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    仁科記念賞 3人が受賞

  • Glowing Organic Molecule 新聞・雑誌

    Scienceya.com  2017年10月

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    Glowing Organic Molecule

  • 安く簡単に作れる夜光塗料 九大が開発 新聞・雑誌

    朝日新聞  2017年10月

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    安く簡単に作れる夜光塗料 九大が開発

  • レアメタル不要、光蓄え輝く有機化合物開発 九州大 新聞・雑誌

    産経フォト、産経ニュース  2017年10月

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    レアメタル不要、光蓄え輝く有機化合物開発 九州大

  • 有機材で蓄光システム 電荷分離状態を安定化 九大、塗料などに応用 新聞・雑誌

    日刊工業新聞  2017年10月

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    有機材で蓄光システム 電荷分離状態を安定化 九大、塗料などに応用

  • 夜光塗料 使い道広がるかも 九州大、安くて簡単な作り方開発 新聞・雑誌

    朝日新聞(夕刊)  2017年10月

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    夜光塗料 使い道広がるかも 九州大、安くて簡単な作り方開発

  • 蓄光材安く キラリ新製法 新聞・雑誌

    読売新聞(夕刊)  2017年10月

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    蓄光材安く キラリ新製法

  • レアアースフリーで簡便プロセス 有機蓄光材料 世界初九州大学が開発 新聞・雑誌

    科学新聞  2017年10月

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    レアアースフリーで簡便プロセス 有機蓄光材料 世界初九州大学が開発

  • 光蓄え輝く有機化合物開発 新聞・雑誌

    産経新聞  2017年10月

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    光蓄え輝く有機化合物開発

  • Organic material sets luminescent record 新聞・雑誌

    c&en  2017年10月

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    Organic material sets luminescent record

  • Researchers Develop a Long-Lasting Luminescence for Organic Materials 新聞・雑誌

    Futurism  2017年10月

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    Researchers Develop a Long-Lasting Luminescence for Organic Materials

  • Forscher bringen organische Substanz zum Leuchten 新聞・雑誌

    Spiegel Online  2017年10月

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    Forscher bringen organische Substanz zum Leuchten

  • Langes Nachleuchten organischer Molek?le 新聞・雑誌

    Welt der Physik  2017年10月

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    Langes Nachleuchten organischer Molek?le

  • 有機材料混ぜ 「光源」開発 九大 レアメタル不要、コスト1/10 新聞・雑誌

    西日本新聞  2017年10月

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    有機材料混ぜ 「光源」開発 九大 レアメタル不要、コスト1/10

  • Harnessing hydrogens for high efficiency OLEDs 新聞・雑誌

    new electronics  2017年7月

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    Harnessing hydrogens for high efficiency OLEDs

  • Organic Laser: Recent Development For Longer Light Emissions 新聞・雑誌

    The Science Times  2017年5月

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    Organic Laser: Recent Development For Longer Light Emissions

  • New iPhone screen puts blue-colored spotlight on Japan Supplier

    Bloomberg Technology  2017年4月

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    New iPhone screen puts blue-colored spotlight on Japan Supplier

  • 有機EL 次世代の光 新聞・雑誌

    読売新聞  2016年11月

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    有機EL 次世代の光

  • TADF 実用化へ前進 大学発ベンチャーが開発競う 新聞・雑誌

    電子デバイス産業新聞  2016年11月

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    TADF 実用化へ前進 大学発ベンチャーが開発競う

  • リサーチフロントアワード 安達氏ら12氏選出 新聞・雑誌

    日刊工業新聞  2016年7月

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    リサーチフロントアワード 安達氏ら12氏選出

  • 「第3世代」有機EL 特許を譲渡 製品化へ 九大がベンチャー企業に 新聞・雑誌

    朝日新聞  2016年5月

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    「第3世代」有機EL 特許を譲渡 製品化へ 九大がベンチャー企業に

  • 九大発ベンチャー有機EL市場へ 新聞・雑誌

    産経新聞  2016年2月

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    九大発ベンチャー有機EL市場へ

  • 次世代有機EL実用化へ 新聞・雑誌

    日本経済新聞  2016年2月

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    次世代有機EL実用化へ

  • 九大発 有機ELベンチャー スマホ画面素材 開発へ 新聞・雑誌

    西日本新聞  2016年2月

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    九大発 有機ELベンチャー スマホ画面素材 開発へ

  • スタートアップの風 九州、高まる創業機運 新聞・雑誌

    日本経済新聞  2015年12月

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    スタートアップの風 九州、高まる創業機運

  • 次世代の有機エレクトロニクスを開拓 新聞・雑誌

    日刊工業新聞  2014年11月

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    次世代の有機エレクトロニクスを開拓

  • 九大、第3世代有機EL発光材料を用いた高効率/高耐久性有機ELデバイスを開発

    マイナビニュース  2014年10月

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    九大、第3世代有機EL発光材料を用いた高効率/高耐久性有機ELデバイスを開発

  • 有機EL照明テーマに 新聞・雑誌

    電波新聞  2014年9月

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    有機EL照明テーマに

  • 有機EL 第一世代 発光効率100%に 新聞・雑誌

    西日本新聞  2014年6月

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    有機EL 第一世代 発光効率100%に

  • 「これが究極の有機EL技術」、九州大学が従来の蛍光分子をリン光並みの効率で発光させることに成功

    日経テクノロジーオンライン  2014年5月

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    「これが究極の有機EL技術」、九州大学が従来の蛍光分子をリン光並みの効率で発光させることに成功

  • トップ研究 どう支える 産業界の人材役割重要 新聞・雑誌

    日本経済新聞  2014年3月

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    トップ研究 どう支える
    産業界の人材役割重要

  • 青色の発光効率 九大が100%に 新聞・雑誌

    日本経済新聞、朝日新聞、産経新聞、西日本新聞  2014年3月

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    青色の発光効率 九大が100%に

  • ベンチャー興し、地域産業化 新聞・雑誌

    日刊工業新聞  2013年10月

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    ベンチャー興し、地域産業化

  • 科学する人 中部経済新聞No.1 No.2 No.3 No.4 山陰新聞No.1 No.2 No.3 No.4 神戸新聞No.1 No.2 No.3No.4 中國新聞No.1 No.2 No.3No.4 福井新聞 熊本日日新聞No.1 No.2 新聞・雑誌

    中部経済新聞、山陰新聞、福井新聞、中國新聞、神戸新聞  2013年9月

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    科学する人
    中部経済新聞No.1 No.2 No.3 No.4
    山陰新聞No.1 No.2 No.3 No.4
    神戸新聞No.1 No.2 No.3No.4
    中國新聞No.1 No.2 No.3No.4
    福井新聞
    熊本日日新聞No.1 No.2

  • 有機EL実用化目指す 新聞・雑誌

    糸島新聞  2013年4月

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    有機EL実用化目指す

  • 福岡で「テレビの日本」復活へ 新聞・雑誌

    産経新聞  2013年4月

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    福岡で「テレビの日本」復活へ

  • [FIRST Progress] 安達 千波矢 (九州大学) Chihaya Adachi

    2013年4月

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    [FIRST Progress] 安達 千波矢 (九州大学) Chihaya Adachi

  • 世界をリードする有機光エレクトロニクス 新聞・雑誌

    日刊工業新聞  2013年3月

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    世界をリードする有機光エレクトロニクス

  • Lighting the way

    Lighting the way  2013年3月

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    Lighting the way

  • 素材、人材、新時代 くまもと 新聞・雑誌

    日刊工業新聞  2013年2月

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    素材、人材、新時代 くまもと

  • 世界をリードする福岡の環境技術 有機EL、第3世代発光材料を開発 新聞・雑誌

    事業構想  2013年2月

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    世界をリードする福岡の環境技術 有機EL、第3世代発光材料を開発

  • 有機EL、九大が低コスト発光新材料 オール日本で巻き返し 新聞・雑誌

    グリーンイノベーション(日経産業新聞/日経電子版)  2013年1月

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    有機EL、九大が低コスト発光新材料 オール日本で巻き返し

  • 「新成長分野の現場で見た課題は」というタイトルにて本研究室にて発見した新規有機EL材料及び研究内容について取材された。 テレビ・ラジオ番組

    テレビ東京 「ワールドビジネスサテライト」  2013年1月

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    「新成長分野の現場で見た課題は」というタイトルにて本研究室にて発見した新規有機EL材料及び研究内容について取材された。

  • 県内発 最先端研究 有機EL発光材料 次世代燃料電池 新聞・雑誌

    ふくおか経済  2013年1月

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    県内発 最先端研究 有機EL発光材料 次世代燃料電池

  • 電気の競争力の貢献 九大有機EL 新聞・雑誌

    日経産業新聞  2012年10月

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    電気の競争力の貢献 九大有機EL

  • 九大 次世代有機ELを研究 福岡に専用施設 企業の研究員と共同 新聞・雑誌

    日本経済新聞  2012年10月

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    九大 次世代有機ELを研究 福岡に専用施設 企業の研究員と共同

  • 肖像~ 有機EL 未知の材料追う 新聞・雑誌

    日経新聞  2012年10月

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    肖像~ 有機EL 未知の材料追う

  • 有機EL研究 深耕 新聞・雑誌

    日刊工業新聞  2012年9月

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    有機EL研究 深耕

  • 有機ELディスプレイ 「日本に勝機は必ず訪れる」

    EE times Japan  2012年8月

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    有機ELディスプレイ 「日本に勝機は必ず訪れる」

  • 社説 第三世代有機EL  大学の技術生かし世界の頂へ 新聞・雑誌

    日刊工業新聞  2012年8月

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    社説 第三世代有機EL  大学の技術生かし世界の頂へ

  • ジャパンディスプレイ、九大の有機EL開発プロジェクトに参画

    財経新聞  2012年7月

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    ジャパンディスプレイ、九大の有機EL開発プロジェクトに参画

  • 次世代有機ELパネル共同開発 レアメタル不要に ジャパンディスプレイ 新聞・雑誌

    日経新聞  2012年7月

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    次世代有機ELパネル共同開発 レアメタル不要に ジャパンディスプレイ

  • ジャパンディスプレイ、九大などと次世代有機EL材料を開発

    時事通信  2012年7月

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    ジャパンディスプレイ、九大などと次世代有機EL材料を開発

  • ジャパンディスプレイ、九大・有機ELプロに参加

    朝日新聞デジタル  2012年7月

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    ジャパンディスプレイ、九大・有機ELプロに参加

  • 液晶パネル最大手 ジャパンディスプレイ九大と有機EL研究 脱レアメタル新材料探る 新聞・雑誌

    西日本新聞  2012年7月

     詳細を見る

    液晶パネル最大手 ジャパンディスプレイ九大と有機EL研究 脱レアメタル新材料探る

  • 次世代有機EL開発 福岡県先端地域目指す 来年初め研究機関新設 新聞・雑誌

    日本経済新聞  2012年6月

     詳細を見る

    次世代有機EL開発 福岡県先端地域目指す 来年初め研究機関新設

  • 有機EL開発支援 福岡県が施設整備 新聞・雑誌

    日刊工業新聞  2012年6月

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    有機EL開発支援 福岡県が施設整備

  • 次世代有機EL開発拠点 23日着工 1月稼働 福岡県 新聞・雑誌

    日経新聞  2012年6月

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    次世代有機EL開発拠点 23日着工 1月稼働 福岡県

  • 有機EL新素材で開発 光エネルギーを電気から高変換 レアメタル使わず 九大研究センター 新聞・雑誌

    西日本新聞  2012年3月

     詳細を見る

    有機EL新素材で開発 光エネルギーを電気から高変換 レアメタル使わず 九大研究センター

  • レアメタル含まず 九大、有機EL素子開発 新聞・雑誌

    日経産業新聞  2012年3月

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    レアメタル含まず 九大、有機EL素子開発

  • 純スピン流の生成効率 省エネデバイス実用化を目指す 発光効率86%に向上 有機EL用材料を開発 新聞・雑誌

    日刊工業新聞  2012年3月

     詳細を見る

    純スピン流の生成効率 省エネデバイス実用化を目指す 発光効率86%に向上 有機EL用材料を開発

  • レアメタルを含まないリン光有機EL素子で外部量子効率5%超、九州大学が開発

    日経BP Tech-On!  2012年3月

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    レアメタルを含まないリン光有機EL素子で外部量子効率5%超、九州大学が開発

  • 九州大、エキサイプレックス発光による有機EL素子の高効率化に成功

    マイナビニュース  2012年3月

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    九州大、エキサイプレックス発光による有機EL素子の高効率化に成功

  • OPERA 近未来ディスプレイ紹介など クリスマスサイエンスレクチャー 新聞・雑誌

    電波新聞  2011年12月

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    OPERA 近未来ディスプレイ紹介など クリスマスサイエンスレクチャー

  • 九大・最先端研究棟 中川文科相が視察(伊都キャンパス) 新聞・雑誌

    朝日新聞  2011年12月

     詳細を見る

    九大・最先端研究棟 中川文科相が視察(伊都キャンパス)

  • アジアと連携 牽引役期待 文科相が九大伊都キャンパスを視察 新聞・雑誌

    西日本新聞  2011年12月

     詳細を見る

    アジアと連携 牽引役期待 文科相が九大伊都キャンパスを視察

  • OPERA クリスマスサイエンスレクチャー2 新聞・雑誌

    糸島新聞  2011年12月

     詳細を見る

    OPERA クリスマスサイエンスレクチャー2

  • 次世代有機EL OPERAが開発推進 新聞・雑誌

    電波新聞  2011年10月

     詳細を見る

    次世代有機EL OPERAが開発推進

  • NHK総合ニュース(有機EL研究棟開所) テレビ・ラジオ番組

    NHK福岡放送局  2011年10月

     詳細を見る

    NHK総合ニュース(有機EL研究棟開所)

  • 報道関連ニュース(有機EL研究棟開所) テレビ・ラジオ番組

    TVQ九州放送  2011年10月

     詳細を見る

    報道関連ニュース(有機EL研究棟開所)

  • 有機EL研究棟が開所 九大伊都キャンパス世界一の拠点目指す テレビ・ラジオ番組

    西日本新聞  2011年10月

     詳細を見る

    有機EL研究棟が開所 九大伊都キャンパス世界一の拠点目指す

  • 九大 有機EL研究棟 材料開発・デバイス評価一貫 新聞・雑誌

    日刊工業新聞  2011年10月

     詳細を見る

    九大 有機EL研究棟 材料開発・デバイス評価一貫

  • 九大伊都キャンパス施設オープン 有機EL「国際的な研究拠点に」 新聞・雑誌

    朝日新聞  2011年10月

     詳細を見る

    九大伊都キャンパス施設オープン 有機EL「国際的な研究拠点に」

  • OPERA  研究棟開所式開く次世代有機EL開発 産学官関係者200人が参加 新聞・雑誌

    電波新聞  2011年10月

     詳細を見る

    OPERA  研究棟開所式開く次世代有機EL開発 産学官関係者200人が参加

  • 福岡市の産学連携センター増設計画 部屋面積倍 13年度新設 新聞・雑誌

    西日本新聞  2011年9月

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    福岡市の産学連携センター増設計画 部屋面積倍 13年度新設

  • 有機ELって? 分かりやすく紹介 新聞・雑誌

    糸島新聞  2011年5月

     詳細を見る

    有機ELって?
    分かりやすく紹介

  • 新たな技術交流拠点を目指す 「くまもと有機薄膜技高度化支援センター」 新聞・雑誌

    日刊工業新聞  2011年3月

     詳細を見る

    新たな技術交流拠点を目指す
    「くまもと有機薄膜技高度化支援センター」

  • 新発光原理の有機EL用材料 新聞・雑誌

    電波新聞  2011年2月

     詳細を見る

    新発光原理の有機EL用材料

  • 熊本県 有機EL九大と連携 新聞・雑誌

    日本経済新聞(九州版)  2011年2月

     詳細を見る

    熊本県 有機EL九大と連携

  • 九大・熊本県 有機ELで連携協定 製品開発や人材教育 新聞・雑誌

    日経産業新聞  2011年2月

     詳細を見る

    九大・熊本県 有機ELで連携協定 製品開発や人材教育

  • 有機EL材、希少金属含まず 九大 新聞・雑誌

    日本経済新聞  2011年2月

     詳細を見る

    有機EL材、希少金属含まず 九大

  • 九州大有機EL用に新材料 レアアース不要、実用化へ道 新聞・雑誌

    読売新聞  2011年2月

     詳細を見る

    九州大有機EL用に新材料 レアアース不要、実用化へ道

  • 次世代の薄型ディスプレー 非金属で有機EL 九大開発 生産コスト大幅削減 新聞・雑誌

    毎日新聞  2011年2月

     詳細を見る

    次世代の薄型ディスプレー 非金属で有機EL
    九大開発 生産コスト大幅削減

  • 有機EL用寂光材料 貴金属使わず高効率 九大が開発 新聞・雑誌

    日刊工業新聞  2011年2月

     詳細を見る

    有機EL用寂光材料 貴金属使わず高効率
    九大が開発

  • 有機ELの低価格化に期待 新発光素材を開発 レアアース不要で高効率 九州大

    西日本新聞  2011年2月

     詳細を見る

    有機ELの低価格化に期待 新発光素材を開発
    レアアース不要で高効率 九州大

  • 福岡で「オペラクリスマスサイエンスレクチャー」 有機ELの技術や用と解説 クリスマス・サイエンス・レクチャー 新聞・雑誌

    電波新聞  2010年12月

     詳細を見る

    福岡で「オペラクリスマスサイエンスレクチャー」
    有機ELの技術や用と解説
    クリスマス・サイエンス・レクチャー

  • 有機ELの技術 市民向け講演会 11日、「さいとぴあ」 新聞・雑誌

    朝日新聞(福岡版)  2010年12月

     詳細を見る

    有機ELの技術
    市民向け講演会
    11日、「さいとぴあ」

  • 有機ELの魅力を紹介 クリスマス・サイエンス・レクチャー

    糸島新聞  2010年12月

     詳細を見る

    有機ELの魅力を紹介
    クリスマス・サイエンス・レクチャー

  • 「科学を身近に」 九大などが講座 有機ELを紹介 新聞・雑誌

    西日本新聞  2010年11月

     詳細を見る

    「科学を身近に」
    九大などが講座
    有機ELを紹介

  • 九州に新たな産業起こせ 有機EL拠点 新聞・雑誌

    西日本新聞  2010年11月

     詳細を見る

    九州に新たな産業起こせ 有機EL拠点

  • 九大に有機発光物拠点 新聞・雑誌

    西日本新聞  2010年10月

     詳細を見る

    九大に有機発光物拠点

  • 8月27日福岡市で「第1回産官学交流セミナー」開催

    電波プロダクトニュース  2010年9月

     詳細を見る

    8月27日福岡市で「第1回産官学交流セミナー」開催

  • 有機EL 長寿・大型化 新聞・雑誌

    日本経済新聞  2010年9月

     詳細を見る

    有機EL 長寿・大型化

  • 有機ELの新発光材料 新聞・雑誌

    日経産業新聞  2010年7月

     詳細を見る

    有機ELの新発光材料

  • 有機EL世界拠点の夢 新聞・雑誌

    日本経済新聞 九州版  2010年7月

     詳細を見る

    有機EL世界拠点の夢

  • 次世代ディスプレイの大本命 有機ELを九州から! テレビ・ラジオ番組

    TVQ九州けいざいNOW  2010年6月

     詳細を見る

    次世代ディスプレイの大本命 有機ELを九州から!

  • 最先端研究開発支援プログラム「スーパー有機EL デバイスとその革新的材料への挑戦」キックオフミーティング開催

    九州大学 press release  2010年6月

     詳細を見る

    最先端研究開発支援プログラム「スーパー有機EL デバイスとその革新的材料への挑戦」キックオフミーティング開催

  • 「スーパー有機ELデバイスとその革新的材料への挑戦」キックオフミーティング開催~最先端研究開発支援プログラム~

    ナノテクジャパン  2010年6月

     詳細を見る

    「スーパー有機ELデバイスとその革新的材料への挑戦」キックオフミーティング開催~最先端研究開発支援プログラム~

  • 有機EL 高機能化へ産学連携 新聞・雑誌

    日本経済新聞九州版  2010年4月

     詳細を見る

    有機EL 高機能化へ産学連携

  • 世界トップ級30人に研究費 新聞・雑誌

    日刊工業新聞  2010年3月

     詳細を見る

    世界トップ級30人に研究費

  • ナノテク開発拠点整備 新聞・雑誌

    毎日新聞  2010年1月

     詳細を見る

    ナノテク開発拠点整備

  • 日経マイクロデバイス10月号に安達教授らの液体有機半導体を用いた有機ELデバイスの研究に関する記事が掲載。 新聞・雑誌

    日経マイクロデバイス  2009年10月

     詳細を見る

    日経マイクロデバイス10月号に安達教授らの液体有機半導体を用いた有機ELデバイスの研究に関する記事が掲載。

  • 8/20(木)に液体有機半導体を用いた有機ELデバイスの研究が日経産業新聞に掲載。 新聞・雑誌

    日経産業新聞  2009年8月

     詳細を見る

    8/20(木)に液体有機半導体を用いた有機ELデバイスの研究が日経産業新聞に掲載。

  • Organic Electronics and Photonicsに液体有機半導体研究のハイライトが掲載。

    Applied Physics Letters  2009年6月

     詳細を見る

    Organic Electronics and Photonicsに液体有機半導体研究のハイライトが掲載。

  • 西日本新聞 科学サイト「Galileon」にて、有機ELおよび当研究室活動等を紹介

    西日本新聞 科学サイト「Galileon」研Q室紹介  2008年4月

     詳細を見る

    西日本新聞 科学サイト「Galileon」にて、有機ELおよび当研究室活動等を紹介

  • FM福岡放送にて有機EL、有機トランジスタを紹介 テレビ・ラジオ番組

    2008年3月

     詳細を見る

    FM福岡放送にて有機EL、有機トランジスタを紹介

  • 有機エレクトロニクスの将来について 新聞・雑誌

    日経新聞  2007年5月

     詳細を見る

    有機エレクトロニクスの将来について

▼全件表示

政策形成、学術振興等への寄与活動

  • 2024年4月 - 2027年3月   フランス国立科学研究センター(CNRS)

    CNRSは、2023年に「CNRSフェロー・アンバサダー」の称号制度を創設。8つの科学分野から世界で1名ずつアンバサダーを任命しており、化学分野で選出された。 フランスの1つまたは複数の研究所で3年間、少なくとも年に1ヶ月招聘され、フランスの研究者と交流するほか、特に若手研究者や博士課程の学生の指導にあたる。

  • 2015年4月 - 2024年3月   福岡県(㈶福岡県産業・科学技術振興財団(ふくおかIST)

    有機光エレクトロニクス実用化開発センター・センター長として有機光エレクトロニクスデバイスの実用化・製品化を行うための指導・助言を行う。

  • 2015年4月 - 2019年3月   九州先端科学技術研究所(ISIT))

    「有機光デバイス研究室長」として次世代有機半導体デバイスの創成に向けた革新的な共通基盤技術の開発」に関する研究開発事業を始め、定期交流会、技術セミナー、コンサルティング等各種事業を九州先端科学技術研究所(ISIT)と共に進める。

  • 2011年7月 - 2024年3月   福岡県(㈶福岡県産業・科学技術振興財団(ふくおかIST)、九州先端科学技術研究所(ISIT))

    日本学術振興会「最先端研究開発支援プログラム(FIRSTプログラム)」は、「スーパー有機ELデバイスとその革新的材用への挑戦」の研究課題の下、九大に「最先端有機光エレクトロニクス研究センター(OEPRA)」を設置し、有機ELを中心とした研究開発を進めている。本プログラムでは、出口を意識した研究成果を強く求められており、この出口戦略の一環として、経済産業省の補助事業である「技術の橋渡し拠点」整備事業(建物・設備整備)に福岡県を事業主体として応募し、採択された。この活動母体として、福岡県の外郭団体である㈶福岡県産業・科学技術振興財団(ふくおかIST)の下部組織として、有機光エレクトロニクス産学連携実用化基盤センターを設立し、九州先端科学技術研究所(ISIT)と共に産学官連携を進める。

  • 2008年12月 - 2019年3月   日本学術振興会142C部会

    学術振興会142C委員会第30回特別研究会を門司港ホテルにて開催。約50名の参加があり、2日間有機エレクトロニクスの材料・デバイス物性の基礎から実用デバイスまで、活発な議論が行われた。

外国人研究者等の受け入れ状況

  • Inner Mongolia Minzu University

    受入れ期間: 2024年12月 - 2024年11月   (期間):1ヶ月以上

    国籍:中華人民共和国

  • Université Sorbonne Paris Nord

    受入れ期間: 2024年1月   (期間):2週間未満

    国籍:フランス共和国

  • CNRS

    受入れ期間: 2023年11月   (期間):2週間未満

    国籍:フランス共和国

  • National University of Singapore

    受入れ期間: 2023年10月 - 2023年11月   (期間):2週間未満

    国籍:中華人民共和国

  • Strasbourg Institute of Material Physics and Chemistry

    受入れ期間: 2023年10月   (期間):2週間未満

    国籍:フランス共和国

  • the French Alternative Energies and Atomic Energy Commission (CEA/Paris-Saclay)

    受入れ期間: 2023年9月 - 2023年10月   (期間):2週間以上1ヶ月未満

    国籍:フランス共和国

  • Soochow University

    受入れ期間: 2023年8月 - 2024年8月   (期間):1ヶ月以上

    国籍:中華人民共和国

  • Soochow University

    受入れ期間: 2023年8月   (期間):2週間未満

    国籍:台湾

  • National Taipei University of Technology

    受入れ期間: 2023年7月   (期間):2週間以上1ヶ月未満

    国籍:台湾

  • University of Queensland

    受入れ期間: 2023年2月 - 2023年4月   (期間):1ヶ月以上

    国籍:オーストラリア連邦

  • Sun Yat-sen University

    受入れ期間: 2023年1月 - 2023年12月   (期間):1ヶ月以上

    国籍:中華人民共和国

  • 受入れ期間: 2023年1月   (期間):2週間未満

    国籍:日本国

  • Adam Mickiewicz University

    受入れ期間: 2022年9月 - 2022年12月   (期間):1ヶ月以上

    国籍:ポーランド共和国

  • 台北科技大学

    受入れ期間: 2022年9月 - 2022年2月   (期間):1ヶ月以上

    国籍:台湾

  • Dongguk University

    受入れ期間: 2022年8月 - 2025年8月   (期間):1ヶ月以上

    国籍:大韓民国

  • Sorbonne Paris Nord University

    受入れ期間: 2022年7月 - 2022年8月   (期間):2週間未満

    国籍:フランス共和国

  • Sorbonne Paris Nord University

    受入れ期間: 2022年7月 - 2022年8月   (期間):2週間以上1ヶ月未満

    国籍:フランス共和国

  • University of Mons

    受入れ期間: 2020年3月 - 2020年6月   (期間):1ヶ月以上

    国籍:ベルギー王国

  • ソルボンヌ大学

    受入れ期間: 2020年1月 - 2023年7月   (期間):1ヶ月以上

    国籍:フランス共和国

    専業主体:民間・財団

  • ソルボンヌ大学

    受入れ期間: 2020年1月 - 2020年3月   (期間):2週間未満

    国籍:中華人民共和国

  • University of Queensland

    受入れ期間: 2019年12月   (期間):2週間未満

    国籍:インド

    専業主体:日本学術振興会

  • University of Queensland

    受入れ期間: 2019年12月   (期間):2週間未満

    国籍:オーストリア共和国

    専業主体:日本学術振興会

  • 西安交通大学

    受入れ期間: 2019年10月 - 2021年9月   (期間):1ヶ月以上

    国籍:中華人民共和国

    専業主体:民間・財団

  • Sorbonne University

    受入れ期間: 2019年10月 - 2019年12月  

    国籍:フランス共和国

  • ソルボンヌ大学

    受入れ期間: 2019年9月 - 2019年10月   (期間):2週間以上1ヶ月未満

    国籍:フランス共和国

  • Ewha Womens University

    受入れ期間: 2019年9月  

    国籍:フランス共和国

  • Bahir Dar University

    受入れ期間: 2019年8月 - 2020年1月  

    国籍:エチオピア連邦民主共和国

  • L'Ecole Polytechnique Federale de Lausanne(EPFL)

    受入れ期間: 2019年7月 - 2019年8月  

    国籍:フランス共和国

  • Sorbonne University

    受入れ期間: 2019年7月  

    国籍:フランス共和国

  • St Andrews

    受入れ期間: 2019年6月  

    国籍:リトアニア共和国

  • Sorbonne University

    受入れ期間: 2019年6月  

    国籍:メキシコ合衆国

  • St Andrews

    受入れ期間: 2019年6月  

    国籍:ブラジル連邦共和国

  • University of Freiburg

    受入れ期間: 2019年5月 - 2019年8月  

    国籍:ドイツ連邦共和国

  • Ewha Womans University

    受入れ期間: 2019年2月 - 2019年3月  

    国籍:フランス共和国

  • The University of Queesland

    受入れ期間: 2019年2月 - 2019年3月  

    国籍:グレートブリテン・北アイルランド連合王国(英国)

  • Université Paris 13 Nord

    受入れ期間: 2019年1月 - 2019年2月  

    国籍:フランス共和国

  • Université Paris 13 Nord

    受入れ期間: 2019年1月 - 2019年2月  

    国籍:フランス共和国

  • Ewha Womans University

    受入れ期間: 2018年11月  

    国籍:フランス共和国

  • Ewha Womans University

    受入れ期間: 2018年11月  

    国籍:フランス共和国

  • University of St Andrews

    受入れ期間: 2018年10月  

    国籍:グレートブリテン・北アイルランド連合王国(英国)

  • IMS Bordeaux

    受入れ期間: 2018年10月  

    国籍:フランス共和国

  • Sorbonne University

    受入れ期間: 2018年9月  

    国籍:フランス共和国

  • Sorbonne University

    受入れ期間: 2018年9月  

    国籍:フランス共和国

  • Tamkang University

    受入れ期間: 2018年8月  

    国籍:台湾

  • University of St Andrews

    受入れ期間: 2018年8月  

    国籍:ドイツ連邦共和国

  • University of St Andrews

    受入れ期間: 2018年7月 - 2018年8月  

    国籍:インド

  • Linköping University

    受入れ期間: 2018年5月  

    国籍:フランス共和国

  • University of Strathclyde

    受入れ期間: 2018年2月  

    国籍:その他

  • French National Scientific Research Center

    受入れ期間: 2018年1月  

    国籍:フランス共和国

  • University of California

    受入れ期間: 2018年1月  

    国籍:その他

  • Nature Communications

    受入れ期間: 2018年1月  

    国籍:その他

  • Aix Marseille University

    受入れ期間: 2017年11月  

    国籍:フランス共和国

  • CNRS

    受入れ期間: 2017年11月  

    国籍:フランス共和国

  • Vilnius University

    受入れ期間: 2017年10月  

    国籍:リトアニア共和国

  • Soochow University

    受入れ期間: 2017年7月  

    国籍:中華人民共和国

  • Case Western Reserve University

    受入れ期間: 2017年7月  

    国籍:その他

  • Dept. of Materials Science & Engineering, Seoul National University

    受入れ期間: 2017年5月  

    国籍:大韓民国

  • Pierre & Marie Curie University,

    受入れ期間: 2017年5月  

    国籍:フランス共和国

  • Université Pierre et Marie Curie (UPMC)

    受入れ期間: 2017年1月 - 2017年3月  

    国籍:フランス共和国

  • University of St Andrews,

    受入れ期間: 2017年1月 - 2017年2月  

    国籍:グレートブリテン・北アイルランド連合王国(英国)

  • University of Queensland

    受入れ期間: 2016年12月 - 2017年1月  

    国籍:オーストラリア連邦

  • University of Queensland

    受入れ期間: 2016年12月 - 2017年1月  

    国籍:オーストラリア連邦

  • Vilnius University

    受入れ期間: 2016年12月  

    国籍:その他

  • University of Queensland

    受入れ期間: 2016年2月 - 2016年3月   (期間):1ヶ月以上

    国籍:オーストラリア連邦

  • 受入れ期間: 2016年1月 - 2016年6月  

    国籍:フランス共和国

  • Université Pierre et Marie Curie (UPMC)

    受入れ期間: 2015年12月 - 2016年2月  

    国籍:フランス共和国

  • Ewha Womans University

    受入れ期間: 2015年12月 - 2016年2月   (期間):1ヶ月以上

    国籍:ポーランド共和国

  • New Mongol Institute of Technology, Mongolia

    受入れ期間: 2015年6月 - 2015年8月   (期間):1ヶ月以上

    国籍:モンゴル国

  • Chemistry of Polymers Sorbonne Universities UPMC

    受入れ期間: 2014年12月 - 2015年2月  

    国籍:フランス共和国

  • The Faculty of Physica, Vilnius University

    受入れ期間: 2014年8月 - 2014年11月  

    国籍:その他

  • Indian Institute of Science

    受入れ期間: 2014年8月 - 2014年10月  

    国籍:インド

  • Department of Physics, Ewha womans University

    受入れ期間: 2013年12月 - 2014年1月  

    国籍:大韓民国

    専業主体:学内資金

  • Directeur de recherche émérite CNRS

    受入れ期間: 2013年10月   (期間):2週間以上1ヶ月未満

    国籍:フランス共和国

    専業主体:学内資金

  • 工学研究院応用科学部門

    受入れ期間: 2013年4月 - 2014年3月   (期間):1ヶ月以上

    国籍:大韓民国

  • 最先端有機光エレクトロニクス研究センター

    受入れ期間: 2013年2月   (期間):2週間以上1ヶ月未満

    国籍:ベルギー王国

  • 最先端有機光エレクトロニクス研究センター

    受入れ期間: 2013年1月 - 2016年3月   (期間):1ヶ月以上

    国籍:バングラデシュ人民共和国

  • Vilnius University

    受入れ期間: 2013年1月 - 2013年4月   (期間):1ヶ月以上

    国籍:日本国

  • 最先端有機光エレクトロニクス研究センター

    受入れ期間: 2012年12月 - 2013年1月  

    国籍:中華人民共和国

  • 最先端有機光エレクトロニクス研究センター

    受入れ期間: 2012年12月   (期間):2週間以上1ヶ月未満

    国籍:フランス共和国

  • University of Augsburg

    受入れ期間: 2012年6月 - 2012年9月   (期間):1ヶ月以上

    国籍:ドイツ連邦共和国

    専業主体:日本学術振興会

  • 未来科学創造センター

    受入れ期間: 2012年4月 - 2012年10月   (期間):1ヶ月以上

    国籍:中華人民共和国

  • 最先端有機光エレクトロニクス研究センター

    受入れ期間: 2011年4月 - 2015年3月  

    国籍:アメリカ合衆国

  • 九州大学 未来化学創造センター

    受入れ期間: 2011年4月 - 2014年3月   (期間):1ヶ月以上

    国籍:中華人民共和国

  • 最先端有機光エレクトロニクス研究センター

    受入れ期間: 2010年11月 - 2011年3月  

    国籍:大韓民国

  • 最先端有機光エレクトロニクス研究センター

    受入れ期間: 2010年5月 - 2015年3月  

    国籍:中華人民共和国

  • 未来化学創造センター

    受入れ期間: 2009年4月 - 2010年3月   (期間):1ヶ月以上

    国籍:モンゴル国

    専業主体:学内資金

  • 未来化学創造センター

    受入れ期間: 2008年11月 - 2009年3月   (期間):1ヶ月以上

    国籍:中華人民共和国

    専業主体:学内資金

  • University of Augsburg

    受入れ期間: 2008年10月 - 2008年12月   (期間):1ヶ月以上

    国籍:ドイツ連邦共和国

  • Dresden University

    受入れ期間: 2007年5月 - 2009年6月   (期間):1ヶ月以上

    国籍:ドイツ連邦共和国

    専業主体:文部科学省

  • 台湾交通大学

    受入れ期間: 2007年4月 - 2008年8月   (期間):1ヶ月以上

    国籍:台湾

    専業主体:科学技術振興事業団

▼全件表示

海外渡航歴

  • 1999年5月 - 2002年5月

    滞在国名1:アメリカ合衆国   滞在機関名1:Prinston University, Center for Photonics and Optoelectronic Materials

学内運営に関わる各種委員・役職等

  • 2023年4月 - 2024年3月   その他 総合研究棟管理運営委員会

  • 2023年4月 - 2024年3月   その他 施設管理委員会

  • 2023年4月 - 2024年3月   その他 研究企画委員会

  • 2023年4月 - 2024年3月   その他 大学評価委員会

  • 2023年1月 - 2023年12月   その他 就職担当

  • 2022年4月 - 2023年3月   その他 施設管理委員会

  • 2022年4月 - 2023年3月   その他 大学評価委員会

  • 2022年4月 - 2022年3月   その他 広報委員会

  • 2021年4月 - 2022年3月   研究院 応用化学部門 部門長

  • 2018年4月 - 2020年3月   部門 工学紀要編集委員会

  • 2016年4月 - 2018年3月   部門 人事連絡委員

  • 2015年4月 - 2016年3月   研究院 応用化学部門 部門長

  • 2013年4月 - 2015年3月   研究院 国際連携委員会

  • 2010年4月 - 2012年3月   研究院 研究企画委員会

  • 2006年4月 - 現在   全学 伊都地区 環境対策WG

  • 分子システムデバイス国際リーダー教育センター長

  • 最先端有機光エレクトロニクス研究センター長

  • その他 リーディングプログラム プログラムコーディネーター

▼全件表示