Outline

Photochemistry is expected to play a versatile role in electronics, energy, medicine/heath care, and functional materials in modern society. In molecular donor-acceptor (D-A) systems, charge-transfer (CT) has been regarded as “static exciton” governed by Coulombic interaction (left bottom of Figure 1). However, in addition to Coulombic interaction, dynamic effects including movement of atomic nucleus and lattice as well as spin-orbit interaction influence behavior of electron and spin with the passage of time ranging from femtoseconds to seconds (defined as “dynamic exciton”, right middle of Figure 1). For instance, recently power conversion efficiencies of organic photovoltaics (OPV) have been improved remarkably, but there is a limit to understanding the underlying mechanism solely from a framework of “static exciton”, as things stand at the moment, becoming a bottleneck of high-performance OPV. Moreover, to get more deep insight into the dynamic effects occurring at primary stages of photophysical and photochemical events, it is needed to exploit precise spectroscopic measurements and theoretical treatments. In this project, we aim to solve the above issues by merging rational molecular design based on the dynamic effects with world-leading high-resolution spectroscopies and unique theoretical analyses. In particular, we focus on manipulating CT states for energy conversion such as organic light-emitting diodes (OLED) and OPV in term of electron-vibration and spin-orbit couplings.

Head investigatorHiroshi Imahori(Professor, Graduate School of Engineering, Kyoto University, Japan)
PeriodFY2020–2024
Area ID20A201

Member

A01 GroupCreation of Dynamic Exciton

Project title:Bridge-Mediated Dynamic Exciton
Leader:Hiroshi Imahori (Professor, Graduate School of Engineering, Kyoto University, Japan, A01 Group leader
Contributor:Tomokazu Umeyama (Professor, Graduate School of Engineering, University of Hyogo, Japan)
Project ID:20H05832

http://www.moleng.kyoto-u.ac.jp/~moleng_05/index_e.html

Project title:Development of organic donor-acceptor materials for dynamic exciton control
Leader:Hiroko Yamada (Professor, Graduate School of Science and Technology, Nara Institute of Science and Technology, Japan)
Contributor:Kyohei Matsuo (Assistant Professor, Graduate School of Science and Technology, Nara Institute of Science and Technology, Japan)
Collaborator:Naoki Aratani (Associate Professor, Graduate School of Science and Technology, Nara Institute of Science and Technology, Japan)
Collaborator:Hironobu Hayashi (Assistant Professor, Graduate School of Science and Technology, Nara Institute of Science and Technology, Japan)
Project ID:20H05833

https://mswebs.naist.jp/LABs/env_photo_greenmat/en/index.html

Project title:Creation of organic-inorganic donor・acceptor materials for control of dynamic exciton
Leader:Eri Sakuda (Associate Professor, Graduate School of Engineering, Nagasaki University, Japan)
Project ID:20H05834

http://www.cms.nagasaki-u.ac.jp/lab/sakutai/index_e.htm

A02 GroupAnalysis of Dynamic Exciton

Project title:Interaction in Dynamic Exciton Studied by Electron Spin Polarization Imaging
Leader:Yasuhiro Kobori (Professor, Molecular Photoscience Research Center, Kobe University, Japan, A02 Group leader
Collaborator:Masaaki Fuki (Research Associate, Molecular Photoscience Research Center, Kobe University, Japan)
Project ID:20H05835

http://www2.kobe-u.ac.jp/~ykobori/frame%20-%20Eng.html

Project title:Nanometer-scale spatial evaluation of dynamic exciton by transient microwave spectroscopy
Leader:Akinori Saeki (Professor, Graduate School of Engineering, Osaka University, Japan)
Project ID:20H05836

http://www.chem.eng.osaka-u.ac.jp/~saeki/cmpc/

Project title:Spatiotemporal Analysis of Dynamic Exciton by Solid-State NMR
Leader:Katsuaki Suzuki (Assistant professor, Institute for Chemical Research, Kyoto University, Japan)
Project ID:20H05837

http://molmat.kuicr.kyoto-u.ac.jp/

Project title:Wideband transient absorption spectroscopy for the analysis of dynamic exciton
Leader:Akira Yamakata (Associate Professor, Graduate School of Engineering, Toyota Technological Institute, Japan)
Collaborator:Kosaku Kato (Postdoctoral Researcher, Graduate School of Engineering, Toyota Technological Institute, Japan)
Project ID:20H05838

https://www.toyota-ti.ac.jp/photochem/index.htm

Project title:Theory of dynamic exciton
Leader:Masahiro Higashi (Associate Professor, Graduate School of Engineering, Kyoto University, Japan)
Collaborator:Hiroshi Nakano (Assistant Professor, Graduate School of Engineering, Kyoto University, Japan)
Project ID:20H05839

http://www.riron.moleng.kyoto-u.ac.jp/

A03 GroupFunction of Dynamic Exciton

Project title:Material design based on dynamic excition and their applications
Leader:Hironori Kaji (Professor, Institute for Chemical Research, Kyoto University, Japan, A03 Group leader)
Project ID:20H05840

http://molmat.kuicr.kyoto-u.ac.jp/index-e.html

Project title:Development of functional organic semiconductors towards utilization of dynamic exciton and their application to organic solar cells
Leader:Yutaka Ie (Professor, The Institute of Scientific and Industrial Research, Osaka University, Japan)Contributor:Tomohiro Higashino (Assistant Professor, Graduate School of Engineering, Kyoto University, Japan)
Collaborator:Seihou Jinnai (Assistant Professor, The Institute of Scientific and Industrial Research, Osaka University, Japan)
Soichi Yokoyama (Assistant Professor, The Institute of Scientific and Industrial Research, Osaka University, Japan)
Naoki Ando (Assistant Professor, The Institute of Scientific and Industrial Research, Osaka University, Japan)
Project ID:20H05841

https://www.sanken.osaka-u.ac.jp/labs/omm/

Project title:Optical control of the plasma membrane functions by using dynamic excition
Leader:Tatsuya Murakami (Professor, Graduate School of Engineering, Toyama Prefectural University, Japan)
Contributor:Tomohiro Numata (Lecturer, Fukuoka University Faculty of Medicine, Japan)
Project ID:20H05842

https://www.pu-toyama.ac.jp/BR/murakami/

Project title:Development of sp3 C-H functionalization of simple alkane by dynamic exciton photocatalyst
Leader:Harunobu Mitsunuma (Assistant professor, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Japan)
Project ID:20H05843

http://www.f.u-tokyo.ac.jp/~kanai/e_index.html

Recruited member

A01 GroupCreation of Dynamic Exciton

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A02 GroupAnalysis of Dynamic Exciton

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A03 GroupFunction of Dynamic Exciton

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