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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

    - 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

    - 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  

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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  

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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  

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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  

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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  

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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  

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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  

  • 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

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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.

    DOI: 10.1002/anie.202420417

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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.

    DOI: 10.1002/chem.202402777

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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)  

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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.

    DOI: 10.1002/adma.202408775

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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.

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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.

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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.

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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.

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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.

    DOI: 10.1039/d3tc03576j

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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)  

    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)  

    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)  

    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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    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

    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.

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

    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)  

    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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    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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    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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    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)  

    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)  

    DOI: 10.1116/6.0003050

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

    12 ( 3 )   2023年10月

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    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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    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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    DOI: 10.1016/j.cej.2023.144516

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

    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

    5 ( 8 )   2148 - 2155   2023年7月

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    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

    33 ( 44 )   2023年7月

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    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

    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)  

    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

    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

    2023年5月

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    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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    DOI: 10.1039/d3tc00641g

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

    2023年5月

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    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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    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

    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

    2023年3月

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    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

    11 ( 10 )   2023年3月

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    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

    8 ( 9 )   2023年2月

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    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

    11 ( 8 )   2023年2月

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    DOI: 10.1002/adom.202202666

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

    17 ( 3 )   280 - 285   2023年1月

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    DOI: 10.1038/s41566-022-01106-8

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

    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

    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

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

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    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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    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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    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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    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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    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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    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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    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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    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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

    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

    32 ( 32 )   2204352 - 2204352   2022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.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

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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)  

    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)  

    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)  

    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

    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

    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

    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)  

    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)  

    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

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  • 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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    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

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  • 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

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  • 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

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  • 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)  

    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)  

    DOI: 10.1038/s41467-021-26439-w

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

    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)  

    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)  

    DOI: 10.1002/adma.202103976

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

    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)  

    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)  

    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

    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

    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

    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

    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

    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

    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

    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

    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)  

    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)  

    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)  

    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)  

    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

    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

    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

    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

    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

    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

    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

    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

    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

    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

    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)  

    DOI: 10.1002/adom.202002174

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

    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)  

    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

    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

    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)  

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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)  

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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

    2 ( 12 )   1567 - 1574   2020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/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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.macromol.0c02235

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

    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

    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)  

    DOI: 10.1039/d0sc04583g

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

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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

    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

    8 ( 21 )   2001234 - 2001234   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: 10.1002/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

    32 ( 45 )   2003911 - 2003911   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: 10.1002/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)  

    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

    Photochemical & Photobiological Sciences   19 ( 10 )   1344 - 1355   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: 10.1039/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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/d0mh00952k

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

    4 ( 10 )   2000305 - 2000305   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: 10.1002/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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s41566-020-0668-z

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

    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

    Advanced Optical Materials   8 ( 20 )   2000784 - 2000784   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: 10.1002/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)  

    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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    記述言語:その他  

    DOI: 10.26434/chemrxiv.12956456

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

    117 ( 10 )   103503 - 103503   2020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: 10.1063/5.0023622

  • 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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.31635/ccschem.020.202000327

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

    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)  

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.jpcc.0c03996

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

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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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    記述言語:その他   掲載種別:研究論文(学術雑誌)  

    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)  

    DOI: 10.1002/adfm.202001078

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

    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)  

    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)  

    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

    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)  

    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)  

    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  

    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)  

    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)  

    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  

    DOI: 10.1016/j.dyepig.2019.107775

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

    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)  

    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)  

    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

    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

    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

    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)  

    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

    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)  

    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)  

    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

    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)  

    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

    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

    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

    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)  

    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  

    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  

    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)  

    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)  

    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)  

    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)  

    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)  

    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

    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)  

    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

    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)  

    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

    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)  

    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)  

    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)  

    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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    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

    6 ( 17 )   1800376   2018年9月

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    記述言語:英語  

    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)  

    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)  

    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

    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)  

    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)  

    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

    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)  

    Well-ordered films of disk-shaped thermally activated delayed fluorescence (TADF) molecules
    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)  

    Emission properties of thermally activated delayed fluorescence emitters: Analysis based on a four-level model considering a higher triplet excited state
    © 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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    記述言語:その他  

    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)  

    DOI: 10.1117/1.JPE.8.032102

  • Diffusion Enhancement in Highly Excited MAPbI3 Perovskite Layers with Additives 査読

    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)  

    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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    記述言語:その他  

    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

    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)  

    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)  

    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)  

    DOI: 10.1002/adfm.201706023

  • High-efficiency electroluminescence and amplified spontaneous emission from a thermally activated delayed fluorescent near-infrared emitter 査読

    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)  

    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)  

    DOI: 10.1021/acs.jpclett.7b03232

  • Thermally activated delayed fluorescence of a Zr-based metal–organic framework

    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

    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)  

    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)  

    DOI: 10.1021/acsami.7b15562

  • Exciton diffusion in bifluorene single crystals studied by light induced transient grating technique 査読

    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)  

    DOI: 10.1063/1.5008376

  • The role of fluorine-substitution on the π-bridge in constructing effective thermally activated delayed fluorescence molecules 査読

    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)  

    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)  

    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)  

    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)  

    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)  

    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

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    DOI: 10.1063/1.4986504

  • Nature of the singlet and triplet excitations mediating thermally activated delayed fluorescence 査読 国際誌

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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

    29 ( 17 )   [1606448-1] - [1606448-5]   2017年3月

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    記述言語:英語  

    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)  

    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)  

    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

    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)  

    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)  

    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)  

    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)  

    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)  

  • 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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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

    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)  

    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)  

    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)  

    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)  

    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

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    DOI: 10.1002/adma.201502610

  • Triarylboron-Based Fluorescent Organic Light-Emitting Diodes with External Quantum Efficiencies Exceeding 20 &#37;

    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

    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)  

    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)  

    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)  

    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)  

    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)  

    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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    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)  

    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)  

    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)  

    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)  

    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)  

    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  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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  

    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)  

    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)  

    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)  

    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)  

    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)  

    DOI: 10.1116/1.4871756

  • Structural and mechanistic insights into an Fe3+-triggered quinazoline based molecular rotor 査読 国際誌

    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)  

    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)  

    DOI: 10.1038/ncomms5016

  • Electrogenerated Chemiluminescence of Donor–Acceptor Molecules with Thermally Activated Delayed Fluorescence 査読 国際誌

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

  • 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)  

  • 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)  

    Understanding extrinsic degradation in phosphorescent OLEDs
    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    DOI: 10.1038/nature11687

  • Organic Single-Crystal Transistors Based on π-Extended Heteroheptacene Microribbons 査読

    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)  

    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)  

    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

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    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    DOI: 10.1063/1.4737006

  • Highly luminescent π-conjugated dithienometalloles: photophysical properties and their application in organic light-emitting diodes 国際誌

    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)  

    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)  

    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)  

  • 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)  

    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)  

    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)  

    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)  

    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)  

    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)  

    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)  

  • 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)  

    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)  

    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)  

  • An integrated enzyme-linked immunosorbent assay system with an organic light-emitting diode and a charge-coup