Updated on 2025/06/27

Information

 

写真a

 
CHITOSE YOHEI
 
Organization
Faculty of Engineering Department of Applied Chemistry Assistant Professor
Center for Molecular Systems (CMS) （Concurrent）
Center for Organic Photonics and Electronics Research(OPERA) （Concurrent）
School of Engineering （Concurrent）
Title
Assistant Professor
Profile
分子システム科学センター（CMS）の助教として、応用化学部門において、学部生及び大学院生の卒業研究に関する指導に携わっている。
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Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment

  • Nanotechnology/Materials / Functional solid state chemistry

  • Nanotechnology/Materials / Organic functional materials

  • Nanotechnology/Materials / Synthetic organic chemistry

Degree

  • Ph.D. (Science) （ 2021.3 Hiroshima University ）

Research History

  • Kyushu University Faculty of Engineering Assistant Professor 

    2022.6 - Present

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  • Hiroshima University Graduate School of Advanced Science and Engineering Assistant Professor 

    2021.4 - 2022.3

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  • Hiroshima University 化学専攻 日本学術振興会特別研究員(DC1) 

    2018.4 - 2021.3

Education

  • Hiroshima University   大学院理学研究科   化学専攻 博士課程後期

    2018.4 - 2021.3

  • Hiroshima University   大学院理学研究科   化学専攻 博士課程前期

    2016.4 - 2018.3

  • Hiroshima University   理学部   化学科

    - 2016.3

Research Interests・Research Keywords

  • Research theme： Development of High-Durability TADF and Host Material

    Keyword： Thermally activated delayed fluorescence

    Research period： 2024.4 - Present

  • Research theme： Development of High-Durability Organic Laser Material

    Keyword： ASE

    Research period： 2024 - Present

  • Research theme： Development of Near Infrared Two-photon responsive chromophores

    Keyword： Two-photon absorption

    Research period： 2022.4 - Present

  • Research theme： Development of organic dyes with high two-photon absorption characters in near-infrared region

    Keyword： Two-photon absorption

    Research period： 2018 - Present

Awards

  • 広島大学エクセレントスチューデントスカラシップ成績優秀学生

    2021.3   広島大学  

  • 日本化学会中国四国支部支部長賞

    2018.3   広島大学  

Papers

  • Achieving Highly Efficient Luminescence and Multiphoton Absorption Character in Thermally Activated Delayed Fluorescence Emitters Based on a Tetrabenzo[a,c]Phenazine Core Reviewed International coauthorship

    Gomathi Vinayakam Mageswari, Youhei Chitose, Yu‐Ming Li, Zhe‐Wei Fan, Yun‐Yi Kao, Umamahesh Balijapalli, Ja‐Hon Lin, Tzu‐Chau Lin, Chihaya Adachi

    Angewandte Chemie International Edition   e202509348   2025.6   （ ISSN:14337851 eISSN:1521-3773 ）

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Angewandte Chemie International Edition  

    The integration of multiphoton absorption phenomenon (MPA) with thermally activated delayed fluorescence (TADF) materials opens new avenues for bio-optoelectronic applications. However, the development of TADF emitters that simultaneously exhibit triplet harvesting and MPA is hindered by the challenge of balancing molecular planarity, reduced orbital overlap, and large oscillator strength. In this study, we demonstrate a quadrupolar molecular design based on the tetrabenzo[a,c]phenazine (TBPZ) to accomplish efficient MPA and TADF performance. Two new TADF emitters, TBPZ2TPA and TBPZ2NP, were synthesized, featuring an electron-accepting TBPZ core and electron-donating triarylamine (TAA) units to achieve an optimal balance between TADF and MPA characteristics. Particularly, TBPZ2TPA blended film exhibits orange-red emission with a maximum at 589 nm, a high photoluminescence quantum yield (Ф<inf>PL</inf>) of 71%, a sufficiently small singlet-triplet energy gap (ΔE<inf>ST</inf>) of 0.16 eV and reversed intersystem crossing rate (k<inf>RISC</inf>) of 1.3 × 10<sup>4</sup> s<sup>−1</sup>. Furthermore, it demonstrated a remarkable two-photon absorption (2PA) cross-section (σ<inf>2</inf>) of 892 GM at 780 nm and an excellent 2PA brightness of 785 GM, along with evident three-photon absorption (3PA) at 1200 nm. These results provide a compelling strategy for developing high-performance TADF emitters with exceptional MPA properties, enabling dual functionality for both OLEDs and high-resolution bioimaging.

    DOI： 10.1002/anie.202509348

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  • Achieving Highly Efficient Luminescence and Multiphoton Absorption Character in Thermally Activated Delayed Fluorescence Emitters Based on a Tetrabenzo[a,c]Phenazine Core Reviewed International coauthorship

    Gomathi Vinayakam Mageswari, Youhei Chitose, Yu‐Ming Li, Zhe‐Wei Fan, Yun‐Yi Kao, Umamahesh Balijapalli, Ja‐Hon Lin, Tzu‐Chau Lin, Chihaya Adachi

    Angewandte Chemie   2025.6

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    The integration of multiphoton absorption phenomenon (MPA) with thermally activated delayed fluorescence (TADF) materials opens new avenues for bio-optoelectronic applications. However, the development of TADF emitters that simultaneously exhibit triplet harvesting and MPA is hindered by the challenge of balancing molecular planarity, reduced orbital overlap, and large oscillator strength. In this study, we demonstrate a quadrupolar molecular design based on the tetrabenzo[a,c]phenazine (TBPZ) to accomplish efficient MPA and TADF performance. Two new TADF emitters, TBPZ2TPA and TBPZ2NP, were synthesized, featuring an electron-accepting TBPZ core and electron-donating triarylamine (TAA) units to achieve an optimal balance between TADF and MPA characteristics. Particularly, TBPZ2TPA blended film exhibits orange-red emission with a maximum at 589 nm, a high photoluminescence quantum yield (ФPL) of 71%, a sufficiently small singlet-triplet energy gap (ΔEST) of 0.16 eV and reversed intersystem crossing rate (kRISC) of 1.3 × 10^4 s^−1. Furthermore, it demonstrated a remarkable two-photon absorption (2PA) cross-section (σ2) of 892 GM at 780 nm and an excellent 2PA brightness of 785 GM, along with evident three-photon absorption (3PA) at 1200 nm. These results provide a compelling strategy for developing high-performance TADF emitters with exceptional MPA properties, enabling dual functionality for both OLEDs and high-resolution bioimaging.

    DOI： 10.1002/ange.202509348

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  • Optochemical control of slow-wave sleep in the nucleus accumbens of male mice by a photoactivatable allosteric modulator of adenosine A2A receptors Reviewed International journal

    Koustav Roy, Xuzhao Zhou, Rintaro Otani, Ping-Chuan Yuan, Shuji Ioka, Kaspar E. Vogt, Tamae Kondo, Nouran H. T. Farag, Haruto Ijiri, Zhaofa Wu, Youhei Chitose, Mao Amezawa, David S. Uygun, Yoan Cherasse, Hiroshi Nagase, Yulong Li, Masashi Yanagisawa, Manabu Abe, Radhika Basheer, Yi-Qun Wang, Tsuyoshi Saitoh, Michael Lazarus

    Nature Communications   15 ( 1 )   2024.4   （ eISSN:2041-1723 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    Optochemistry, an emerging pharmacologic approach in which light is used to selectively activate or deactivate molecules, has the potential to alleviate symptoms, cure diseases, and improve quality of life while preventing uncontrolled drug effects. The development of in-vivo applications for optochemistry to render brain cells photoresponsive without relying on genetic engineering has been progressing slowly. The nucleus accumbens (NAc) is a region for the regulation of slow-wave sleep (SWS) through the integration of motivational stimuli. Adenosine emerges as a promising candidate molecule for activating indirect pathway neurons of the NAc expressing adenosine A<sub>2A</sub> receptors (A<sub>2A</sub>Rs) to induce SWS. Here, we developed a brain-permeable positive allosteric modulator of A<sub>2A</sub>Rs (A<sub>2A</sub>R PAM) that can be rapidly photoactivated with visible light (λ &gt; 400 nm) and used it optoallosterically to induce SWS in the NAc of freely behaving male mice by increasing the activity of extracellular adenosine derived from astrocytic and neuronal activity.

    DOI： 10.1038/s41467-024-47964-4

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    Other Link： https://www.nature.com/articles/s41467-024-47964-4

  • Anti-Stokes Luminescence in Multi-Resonance-Type Thermally- Activated Delayed Fluorescence Molecules Reviewed International journal

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

    Angew. Chem. Int. Ed.   62 ( 44 )   e202312326   2023.10

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    有機分子系におけるフォトンアップコンバージョン（UC）技術は、励起エネルギーよりも高いエネルギーを持つ励起子を生成することができるため、将来のエネルギーハーベスティングシステムにとって有望な技術の一つである。本論文では、多重共鳴型熱活性化遅延蛍光（MR-TADF）分子について、長波長側のホットバンド吸収帯を励起することで、UCの一つであるアンチストークスフォトルミネッセンス（ASPL）が観測されたことを報告している。

    DOI： doi.org/10.1002/anie.202312326

  • Porphyrin as a Versatile Visible-Light-Activatable Organic/Metal Hybrid Photoremovable Protecting Group Reviewed International journal

    Adiki Raja Sekhar, Youhei Chitose, Jiří Janoš, Sahar Israeli Dangoor, Andrea Ramundo, Ronit Satchi-Fainaro, Petr Slavíček, Petr Klán, Roy Weinstain

    Nat. Commun.   13 ( 1 )   3614   2022.6   （ eISSN:2041-1723 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    Photoremovable protecting groups (PPGs) represent one of the main contemporary implementations of photochemistry in diverse fields of research and practical applications. For the past half century, organic and metal-complex PPGs were considered mutually exclusive classes, each of which provided unique sets of physical and chemical properties thanks to their distinctive structures. Here, we introduce the meso-methylporphyrin group as a prototype hybrid-class PPG that unites traditionally exclusive elements of organic and metal-complex PPGs within a single structure. We show that the porphyrin scaffold allows extensive modularity by functional separation of the metal-binding chromophore and up to four sites of leaving group release. The insertion of metal ions can be used to tune their spectroscopic, photochemical, and biological properties. We provide a detailed description of the photoreaction mechanism studied by steady-state and transient absorption spectroscopies and quantum-chemical calculations. Our approach applied herein could facilitate access to a hitherto untapped chemical space of potential PPG scaffolds.

    DOI： 10.1038/s41467-022-31288-2

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    Other Link： https://www.nature.com/articles/s41467-022-31288-2

  • Unlocking Dual Functionality in Triazine-Based Emitters: Synergistic Enhancement of Two-Photon Absorption and TADF-OLED Performance with Electron-Withdrawing Substituents

    Youhei Chitose, Gomathi Vinayakam Mageswari, Ryota Zenke, Toshiharu Ide, Shintaro Kohata, Ja-Hon Lin, Youichi Tsuchiya, Chihaya Adachi

    2025.3

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： 10.26434/chemrxiv-2025-8t4c7

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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 Reviewed International coauthorship

    Gomathi Vinayakam Mageswari, Youhei Chitose, Youichi Tsuchiya, Ja-Hon Lin, Chihaya Adachi

    Angewandte Chemie International Edition   64 ( 8 )   e202420417   2025.2   （ ISSN:1433-7851 eISSN:1521-3773 ）

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    Abstract

    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 (ΔE<sub>ST</sub>) and high photoluminescence quantum yield (Φ<sub>PL</sub>). 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 ΔE<sub>ST</sub>. A near‐unity Φ<sub>PL</sub> 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 (σ<sub>2</sub>) 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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  • Molecular asymmetry and rigidification as strategies to activate and enhance thermally activated delayed fluorescence in deep-blue MR-TADF emitters Reviewed

    Rangani Wathsala Weerasinghe, John Marques dos Santos, Youhei Chitose, Tomas Matulaitis, Stuart L. Warriner, Debasish Barman, Chin-Yiu Chan, Youichi Tsuchiya, Eli Zysman-Colman, Chihaya Adachi

    Physical Chemistry Chemical Physics   26 ( 32 )   21337 - 21341   2024.8   （ ISSN:1463-9076 eISSN:1463-9084 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    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.

    DOI： 10.1039/d4cp02664k

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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 Reviewed International journal

    Youhei Chitose, Yuika Tamura, Youichi Tsuchiya, Chihaya Adachi

    Chemistry Letters   53 ( 4 )   upae059   2024.3   （ ISSN:0366-7022 eISSN:1348-0715 ）

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

    Abstract

    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.

    DOI： 10.1093/chemle/upae059

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    Other Link： https://academic.oup.com/chemlett/article-pdf/53/4/upae059/57335721/upae059.pdf

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

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

    Angewandte Chemie International Edition   62 ( 44 )   e202312326   2023.10   （ ISSN:1433-7851 eISSN:1521-3773 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    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

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

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

    Org. Biomol. Chem.   20 ( 48 )   9600 - 9603   2022.11   （ ISSN:1477-0520 eISSN:1477-0539 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Organic and Biomolecular Chemistry  

    In this study, we propose that the trifluoromethylated thermally activated delayed fluorescent molecule 4[Cz(CF3)2]IPN is a versatile organic photocatalyst that can be used for electron-transfer-driven reactions requiring a photocatalyst with high oxidizing power and energy-transfer-driven reactions that require an Ir photocatalyst. 4[Cz(CF3)2]IPN was used in radical reactions via electron transfer and dearomative cycloaddition reactions via energy transfer.

    DOI： 10.1039/D2OB02055F

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  • Pyrrolo[2,1-a]isoquinolines as multitasking organophotocatalysts in chemical synthesis Reviewed International journal

    Yuliang Liu, Haoyu Li, Eugene Yew Kun Tan, Erik Budi Santiko, Youhei Chitose, Manabu Abe, Shunsuke Chiba

    Chem. Catal.   2 ( 10 )   2726 - 2749   2022.9   （ ISSN:26671107 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Chem Catalysis  

    We demonstrate the design and synthesis of pyrrolo[2,1-a]isoquinolines (PIqs) bearing electron-withdrawing groups, which are excited under irradiation with visible light to display wider redox windows and higher triplet-state energies. The photophysical and electrochemical characters of PIqs can be tailored by modification of the electron-withdrawing groups and their positions, enabling redox-neutral (hetero)biaryl cross-coupling between aryl halides and (hetero)arenes, nickel-catalyzed amination and oxygenation of aryl halides, and decarboxylative cross-coupling between α-amino acids and aryl halides, as well as a set of molecular transformations driven by triplet-triplet sensitization under irradiation with visible light.

    DOI： 10.1016/j.checat.2022.08.013

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  • Assemblies of 1,4-Bis(diarylamino)naphthalene and Aromatic Amphiphiles: Highly Reducing Photoredox Catalysis in Water Reviewed International journal

    Yuki Hyodo, Keigo Takahashi, Youhei Chitose, Manabu Abe, Michito Yoshizawa, Takashi Koike,* Munetaka Akita*

    Synlett.   33 ( 12 )   1184 - 1188   2021.10   （ ISSN:09365214 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Synlett  

    Host guest assemblies of a designed 1,4-bis(diarylamino)naphthalene and V-shaped aromatic amphiphiles consisting of two pentamethylbenzene moieties bridged by an m-phenylene unit bearing two hydrophilic side chains emerged as highly reducing photoredox catalysis systems in water. An efficient demethoxylative hydrogen transfer of Weinreb amides has been developed. The present supramolecular strategy permits facile tuning of visible-light photoredox catalysis in water.

    DOI： 10.1055/a-1652-2707

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  • Impact of five-membered heterocyclic rings on photophysical properties including two-photon absorption character Reviewed International journal

    Thuy Thi Thu Pham, Youhei Chitose, Tran Thi Thanh Tam, Wei-Lun Tseng, Tzu-Chau Lin,* and Manabu Abe*

    Chem. Lett.   50 ( 10 )   1810 - 1813   2021.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1246/cl.210420

  • Protonation-Enhanced Reactivity of Triplet State in Dearomative Photocycloaddition of Quinolines to Olefins Reviewed International journal

    Tatsuya Morofuji,* Shota Nagai, Youhei Chitose, Manabu Abe, and Naokazu Kano*

    Org. Lett.   23 ( 16 )   6257 - 6261   2021.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.orglett.1c02026

  • Convenient one-pot access to 2H-3-nitro-thiochromenes from 2-bromobenzaldehydes, sodium sulfide and β-nitrostyrenes Reviewed International journal

    Thi Thu Huong Le, Chitose Youhei, Quy Hien Le, Thanh Binh Nguyen,* and Dinh Hung Mac*

    Org. Biomol. Chem.   17   6355 - 6358   2019.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/C9OB01060B

  • Design and Synthesis of a Caged Carboxylic Acid with a Donor-π-Donor Coumarin Structure: One-photon and Two-photon Uncaging Reactions Using Visible and Near-Infrared Lights Reviewed International coauthorship International journal

    Youhei Chitose, Manabu Abe,* Ko Furukawa, Jhe-Yi Lin, Tzu-Chau Lin,* and Claudine Katan*

    Org. Lett.   19 ( 10 )   2622 - 2625   2017.5

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.orglett.7b00957

  • Design, Synthesis, and Reaction of π-Extended Coumarin-based New Caged Compounds with Two-photon Absorption Character in the Near-IR Region Reviewed International journal

    Youhei Chitose, Manabu Abe,* Ko Furukawa, and Claudine Katan*

    Chem. Lett.   45 ( 10 )   1186 - 1188   2016.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1246/cl.160586

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Books

  • Design and synthesis of two-photon responsive chromophores for application to uncaging

    Youhei Chitose, Manabu Abe*

    Photochemistry  2018.9 

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    Language：English  

    DOI： 10.1039/9781788013598-00219

Presentations

  • Rational molecular design strategy aimed at the compatibility of two-photon absorption phenomenon and TADF-based OLED application with planar triazine derivatives International coauthorship International conference

    Youhei Chitose, Youichi Tsuchiya, Chihaya Adachi

    A-COE 2024 The 16th Asian Conference on Organic Electronics The 16th Asian Conference on Organic Electronics (  2024.11 

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    Event date： 2024.11

    Language：English   Presentation type：Poster presentation  

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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

    Youhei Chitose, Gomathi Vinayakam Mageswari, Chihaya Adachi

    Japan-Taiwan Symposium 2025 (Novel Optoelectronics Materials and Devices)  2025.3 

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    Event date： 2025.3

    Language：English   Presentation type：Oral presentation (general)  

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  • MDシミュレーションによる紫外レーザー材料の分子配向性の検討

    嘉屋 有晟, Kim HyungSuk, 千歳 洋平, Chenais Sebastien, Forget Sebastien, Poriel Cyril, Mathevet Fabrice, 安達 千波矢

    2025年 第72回応用物理学会春季学術講演会  2025.3 

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    Event date： 2025.3

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  • Benchmark molecular design strategy to achieve dual enhancement of record high two-photon absorption cross-section with TADF character

    Gomathi Vinayakam Mageswari, Youhei Chitose, Ja-Hon Lin, Youichi Tsuchiya, Chihaya Adachi

    2025年 第72回応用物理学会春季学術講演会  2025.3 

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    Event date： 2025.3

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  • Rational molecular design strategy to obtain locally excited and charge transfer characters aimed for dual enhancement of two-photon absorption cross-section and TADF activity International coauthorship

    Gomathi Vinayakam Mageswari, Youhei Chitose, Ja-Hon Lin, Youichi Tsuchiya, Chihaya Adachi

    2025年 第72回応用物理学会春季学術講演会  2025.3 

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    Event date： 2025.3

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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

    Youhei Chitose, Gomathi Vinayakam Mageswari, Chihaya Adachi

    有機エレクトロニクス研究会（OME）  2025.3 

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    Event date： 2025.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 近赤外2光子吸収能を有するTADF材料の開発とOLEDの高効率化 Invited

    千歳 洋平

    九州脱炭素研究会  2025.1 

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    Event date： 2025.1

    Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

    Venue：九州大学伊都キャンパス  

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  • Rational molecular design for balanced locally excited and charge transfer character to achieve dual function of two-photon absorption and TADF

    Gomathi Vinayakam Mageswari, Youhei Chitose, Youichi Tsuchiya, Chihaya Adachi

    2024 MRS FALL MEETING & EXHIBIT  2024.12 

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    Event date： 2024.12

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  • 紫外有機半導体レーザーの開発 International coauthorship

    嘉屋 有晟, 安部 彩乃, 千歳 洋平, Chenais Sebastien, Poriel Cyril, Mathevet Fabrice, 安達 千波矢

    第85回応用物理学会秋季学術講演会  2024.9 

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    Event date： 2024.9

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  • ２光子吸収および TADF 特性を両立させるトリアジン誘導体の光物性

    善家 良太, 千歳 洋平, 安逹 千波矢

    2024年光化学討論会  2024.9 

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    Event date： 2024.9

    Language：Japanese   Presentation type：Poster presentation  

    Venue：九州大学伊都キャンパス  

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  • Development of Triazine Derivatives Bearing Electron-Withdrawing Substituent and Their Application to TADF Emitter with Near-Infrared Two-Photon Absorption Character

    Youhei Chitose, Youichi Tsuchiya, Chihaya Adachi

    日本化学会　第104春季年会（2024）  2024.3  日本化学会

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    Event date： 2024.3

    Language：Japanese   Presentation type：Poster presentation  

    Venue：日本大学理工学部船橋キャンパス   Country：Japan  

  • Development of Triazine Derivatives Bearing Electron-Withdrawing Substituent and Their Application to TADF Emitter with Near-Infrared Two-Photon Absorption Character

    Youhei Chitose, Youichi Tsuchiya, Chihaya Adachi

    日本化学会 第104春季年会 (2024)  2024.3 

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    Event date： 2024.3

    Language：Japanese   Presentation type：Poster presentation  

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  • Development of Triazine-Based TADF Emitter with Near-Infrared Two-Photon Absorption Character

    Youhei CHITOSE, Youichi TSUCHIYA, Chihaya ADACHI

    2023年光化学討論会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Poster presentation  

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  • Development of Triazine-Based TADF Emitter with Near-Infrared Two-Photon Absorption Character

    Youhei CHITOSE, Youichi TSUCHIYA, Chihaya ADACHI

    2023年光化学討論会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Poster presentation  

    Country：Japan  

  • 近赤外領域に高い発光効率を有するTADF分子の開発と有機ＥＬへの応用

    千歳 洋平

    九州大学エネルギーウィーク2023（EW2023）  2023.1 

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    Event date： 2023.1

    Language：Japanese   Presentation type：Poster presentation  

    Venue：九州大学  

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  • Photocagedアデノシン2A受容体活性化剤の開発(Development of photocaged adenosine2A receptor activator) International coauthorship

    Nagase Saitoh Tsuyoshi, Ioka Shuji, Korkutata Mustafa, Chitose Yohei, Abe Manabu, Lazarus Mihael, Nagase Hiroshi

    The Journal of Physiological Sciences  2022.12  (一社)日本生理学会

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    Event date： 2022.12

    Language：English   Presentation type：Oral presentation (general)  

  • 近赤外2光子励起可能な分子の設計、合成、光反応 Invited

    千歳 洋平

    第70回 分子システム科学センター(CMS) セミナー  2022.6 

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    Event date： 2022.6

    Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

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  • 近赤外二光子吸収能を有するケージド化合物の設計，合成，光反応

    千歳洋平、安倍学、林子超、クラウディン カタン

    第 10 回 JACI/GSC シンポジウム  2021.6 

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    Event date： 2021.6

    Language：Japanese   Presentation type：Poster presentation  

    Venue：Remo online   Country：Japan  

  • Design, Synthesis, and Photoreactions of Near Infrared Two-photon Responsive Caged Compounds Bearing Coumarin Scaffold International coauthorship International conference

    Youhei Chitose, Manabu Abe, Tzu Chau Lin, Claudine Katan

    Joint Symposium between CSIR-CDRI and HiU-P-DDS  2021.3 

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    Event date： 2021.3

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Zoom online   Country：Japan  

  • Wavelength-selective photolytic pathway of coumarin-based caged compound bearing Donor-π-Donor stilbene structure

    CHITOSE, Youhei; ABE, Manabu; LIN, Tzu-Chau; KATAN, Claudine

    2020年Web光化学討論会  2020.9 

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    Event date： 2020.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Zoom online   Country：Japan  

  • Exploring the Excited State Dynamics of Porphyrin-based Photolabile Protecting Groups by Transient Absorption Spectroscopy International coauthorship International conference

    Youhei Chitose, Petr Klán, Adiki Raja Sekhar, Roy Weinstain

    Central European Conference on Photochemistry CECP 2020  2020.2 

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    Event date： 2020.2

    Language：English   Presentation type：Poster presentation  

    Venue：Bad Hofgastein, Congress Centre, Austria   Country：Austria  

  • Mechanistic study on photoreaction of coumarin based caged compounds with D-π-D cyclic stilbene structure International conference

    Youhei Chitose, Manabu Abe, Tzu Chau Lin, Claudine Katan

    International Conference on Photocatalysis and Photoenergy 2019 (ICoPP 2019)  2019.5 

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    Event date： 2019.5

    Language：English   Presentation type：Poster presentation  

    Venue：Orakai Songdo Park Hotel, Incheon, Korea   Country：Korea, Republic of  

  • Mechanistic study on photo-reaction of coumarin based caged compounds with D-π-D stilbene structure

    Youhei Chitose, Manabu Abe, Tzu-Chau Lin, Claudine Katan

    日本化学会第99春季年会2019  2019.3 

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    Event date： 2019.3

    Language：English   Presentation type：Oral presentation (general)  

    Venue：甲南大学　岡本キャンパス   Country：Japan  

  • Design and Synthesis of Near IR Two-photon Responsive Molecules Bearing D-π-D Topology: Application to Caged Compounds International coauthorship International conference

    Youhei Chitose, Manabu Abe, Tzu-Chau Lin, Claudine Katan

    27th IUPAC International Symposium on Photochemistry  2018.7 

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    Event date： 2018.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：University College Dublin, Dublin, Ireland   Country：Ireland  

  • 近赤外領域に高い２光子応答性を有するD-π-D 型光アンテナの設計、合成と新規クマリン型ケージド化合物への応用 International coauthorship

    千歳洋平、安倍学、林子超、クラウディン カタン

    日本化学会第98春季年会2018  2018.3 

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    Event date： 2018.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：日本大学理工学部　船橋キャンパス   Country：Japan  

  • 近赤外領域の2光子感応性D-π-D型構造を有する光アンテナ分子の設計とケージド化合物への応用 International coauthorship

    千歳洋平、安倍学、古川貢、Tzu-Chau Lin、Claudine Katan

    2017年光化学討論会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：仙台市   Country：Japan  

  • 2光子吸収に優れたクマリン骨格を有する新規ケージド化合物の設計,合成,反応

    千歳洋平、安倍学

    日本化学会　第97春季年会  2017.3 

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    Event date： 2017.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：慶應義塾大学　日吉キャンパス   Country：Japan  

  • Design, Synthesis, and Reaction of New Caged compounds with Two Photon Absorption Character

    千歳洋平、安倍学

    第27回基礎有機化学討論会  2016.9 

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    Event date： 2016.9

    Language：Japanese   Presentation type：Poster presentation  

    Venue：広島国際会議場   Country：Japan  

  • 二光子吸収に優れたクマリン骨格を有する新規ケージド化合物の設計、合成、反応

    千歳洋平、安倍学

    感応性化学種が拓く新物質科学　第6回公開シンポジウム  2016.5 

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    Event date： 2016.5

    Language：Japanese   Presentation type：Poster presentation  

    Venue：東広島市   Country：Japan  

  • 2光子吸収に優れたクマリン骨格を有する新規ケージド化合物の設計,合成,反応

    千歳洋平、安倍学

    日本化学会　第96春季年会  2016.3 

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    Event date： 2016.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：同志社大学　京田辺キャンパス   Country：Japan  

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MISC

  • 2光子応答性ケージド化合物 Reviewed

    千歳洋平，安倍学*

    光化学   2017.12

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    Language：Japanese  

  • Design and Synthesis of Two-Photon Responsive Chromophores for Near-Infrared Light-Induced Uncaging Reactions Reviewed International coauthorship

    Manabu Abe,* Youhei Chitose, Satish Jakkampudi, Pham Thi Thu Thuy, Qianghua Lin, Bui Thi Van, Ayato Yamada, Ryoko Oyama, Miyu Sasaki, and Claudine Katan*

    Synthesis   49   3337 - 3346   2017

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    Language：English   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

    DOI： 10.1055/s-0036-1590813

Industrial property rights

Patent   Number of applications: 3   Number of registrations: 1
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

  • 応用物理学会

    2025 - Present

  • The Chemical Society of Japan

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  • The Japanese Photochemistry Association

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Committee Memberships

  • 2024年光化学討論会実行委員会  

    2024.9   

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  • The 3rd Kyushu-Mainz Chemistry Symposium (The 7th CMS International Symposium) 運営担当  

    2022.12   

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Academic Activities

  • 学術論文の審査

    Role(s)： Peer review

    2024

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    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：2

  • Screening of academic papers

    Role(s)： Peer review

    2023

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    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：3

Research Projects

  • トリフルオロメチル基を有するエキサイプレックス材料を用いた高性能OLEDの開発

    Grant number：25K18088  2025.4 - 2028.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    千歳 洋平

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    Grant type：Scientific research funding

    本研究では、CF3基を導入したCzTRZ誘導体をアクセプターとして用いた分子間エキサイプレックス系をOLEDの発光層に採用することで、従来のOLED素子性能に低消費電力化、高輝度化、高耐久性を付与させる。本研究で開発するCzTRZ誘導体は分子全体にCF3基を導入しているため、HOMOとLUMO準位が従来のCzTRZ誘導体と比べて低くなる。そのため、CF3基を導入したCzTRZ誘導体を電子輸送層に用いることで、電子移動度の向上だけでなく、正孔の金属電極への流入を防ぐことができる。この分子設計により、小さな駆動電圧(3V以下)においても高輝度かつ高耐久性を併せもつ理想的な素子を実現できる。

    CiNii Research

  • 高耐久性と低エネルギー消費を実現する革新的な有機半導体レーザー材料の開発

    2025

    公益財団法人藤森科学技術振興財団  2025年度 研究助成 

    千歳洋平

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    Authorship：Principal investigator  Grant type：Donation

  • 近赤外領域に高い2光子吸収能を有するTADF分子の開発

    2023

    徳山科学技術振興財団  2023年度スタートアップ助成 

    千歳洋平

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    Grant type：Donation

  • 近赤外二光子吸収能を持つベンゾピラン型ケージド化合物の開発と生理学実験への応用

    Grant number：22K14785  2022 - 2024

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Early-Career Scientists

    千歳 洋平

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    Authorship：Principal investigator  Grant type：Scientific research funding

    本研究では，理論計算を用いることで高い近赤外2光子吸収能を有する光解離性保護基を設計し，実際に合成を行う．はじめに合成した光解離性保護基の有機溶媒中における光脱保護効率の確認を行う．光反応量子収率や光反応により生成する脱離基の収率を評価したのち，保護基部位に十分な水溶性を有する置換基を導入することで細胞実験への応用を試みる．生物活性物質として，グルタミン酸や抗がん剤などを保護したケージド化合物を合成し，生体内において，近赤外光を照射することで，活性物質の濃度上昇を時空間的に制御し，これまで未解明であった活性物質の活性発現機構の解明に貢献する．

    CiNii Research

  • 近赤外領域に高い発光効率を有するTADF分子の開発と有機ＥＬへの応用

    2022 - 2023

    九州大学  九州大学 九州大学エネルギー研究教育機構 若手研究者・博士課程学生支援プログラム  九州大学エネルギー研究教育機構　若手研究者・博士課程学生支援プログラム

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    Authorship：Principal investigator  Grant type：On-campus funds, funds, etc.

  • Design and Synthesis of Caged Compound with High Two-Photon Absorption Character in Near IR Region :Its Application to Physiological Experiments

    Grant number：21K20539  2021 - 2022

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Research Activity start-up

    Chitose Youhei

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    Authorship：Principal investigator  Grant type：Scientific research funding

    In this study, we developed a Donor-π-Donor (D-π-D) based coumarin derivative. Its two-photon absorption (TPA) cross-section was determined to be 498 GM at 700 nm by two-photon excited fluorescence method. The two-photon uncaging efficiency of D-π-D based caged benzoic acid was also determined to be 134 GM at 700 nm, which indicates relatively high two-photon responsive chromophore. In addition, we investigated the detail mechanism of bond cleavage steps in the uncaging reaction of caged benzoic acid. The laser flash photolysis experiments and product analysis suggested the presence of methyl cation intermediate which indicated the heterolysis of C-O bond.

    CiNii Research

  • 近赤外領域に高い二光子吸収能を有する光アンテナ部位の設計と合成、生理学への応用

    Grant number：18J20500  2018 - 2020

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

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    Grant type：Scientific research funding

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Educational Activities

  • 専門分野である光化学や有機光エレクトロニクスに関する教育を通じて、学生の論理的思考力・課題解決能力の育成に努めている。学部および大学院教育では、基礎的な演習や講義に加えて、研究室での個別指導を通じて実践的な研究能力とプレゼンテーション能力を身につけさせることを重視している。特に、研究を通じた自律的な学びを促し、将来的に研究者や技術者として活躍できる人材の育成を目指している。

Class subject

  • 物質科学工学実験II

    2025.6 - 2025.7   First semester

  • 2025年度春学期夏学期・火3木5・(IUPE)Experiment in Applied ChemistryⅡA，(IUPE)Experiment in Applied ChemistryⅡB（林　克郎）

    2025.5   First semester

  • 物質科学工学実験I

    2024.10 - 2025.3   Second semester

  • 専門英語

    2024.10 - 2025.3   Second semester

  • 専門英語

    2023.10 - 2024.3   Second semester

  • 専門英語

    2022.10 - 2023.3   Second semester

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FD Participation

  • 2023.4   Role：Participation   Title：令和５年度 第１回全学ＦＤ（新任教員の研修）The 1st All-University FD (training for new faculty members) in FY2023

    Organizer：University-wide

  • 2022.7   Role：Participation   Title：【シス情FD】若手教員による研究紹介⑤

    Organizer：[Undergraduate school/graduate school/graduate faculty]

Teaching Student Awards

  • 25th Engineering Research Planning Seminar at Kyushu University Excellent Presentation Award

    Year and month of award：2024.11

    Classification of award-winning students：Doctoral student   Name of award-winning student：Gomathi Vinayakam Mageswari

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  • 7th Student Seminar Best Presentation Award

    Year and month of award：2024.6

    Classification of award-winning students：Doctoral student   Name of award-winning student：Gomathi Vinayakam Mageswari

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Outline of Social Contribution and International Cooperation activities

  • Participated in a project aimed at helping junior and senior high school students experience the fascination of photochemistry.

Social Activities

  • ピカリかがく-光化学の面白さを伝えるポータルサイト！

    Role(s)：Organizing member

    http://pikari-kagaku.jp  2024 - Present

  • 光化学に関するアウトリーチ活動 クラウドファンディングREADYFOR 光化学の面白さを中高生と共有したい！化学の未来をピカリと照らす！

    Role(s)：Organizing member

    https://readyfor.jp/projects/pikarikagaku  2023 - 2024

Travel Abroad

  • 2019.8 - 2020.2

    Staying countory name 1：Czech Republic   Staying institution name 1：マサリク大学

  • 2017.10 - 2017.12

    Staying countory name 1：Viet Nam   Staying institution name 1：ベトナム国家大学ハノイ校