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 Oganic-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 (Professor, Okayama University, Japan）
Collaborator：Kosaku Kato (Postdoctoral Researcher, Okayama University, 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 (Researcher, National Institute of Advanced Industrial Science and Technology: AIST, 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 (Associate 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 Exciton
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

Project title：Development of a Novel Box-Shaped Electron-Acceptor for Control of Dynamic Exciton
Leader：Midori Akiyama (Assistant Professor, Graduate School of Engineering, Kyoto University)
Project ID：21H05385

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

Project title：Design and Synthesis of Organic Semiconductor with Separated Molecular Orbitals within the Molecular Structure
Leader：Masahiko Saito (Assistant Professor, Graduate School of Advanced Science and Engineering, Hiroshima University)
Collaborator：Kim Hyung Do (Assistant Professor, Graduate School of Engineering, Kyoto University)
Project ID：21H05397

https://osaka.hiroshima-u.ac.jp

Project title：Development of Solution Processable Doublet Emitters
Leader：Ken Albrecht (Associate Professor, Institute for Materials Chemistry and Engineering, Kyushu University)
Project ID：21H05399

https://www.alken-lab.com/

Project title：Creation of Axially Chiral Luminescent Complexes for Dynamic Excitons
Leader：Toshikazu Ono (Associate Professor, Department of Applied Chemistry, Graduate School of Engineering, Kyushu University)
Project ID：21H05400

http://www.chem.kyushu-u.ac.jp/~yhisaeda/

Project title：CT-Assisted Circular Dynamics Exciton
Leader：Junpei Yuasa (Associate Professor, Department of Applied Chemistry, Tokyo University of Science)
Project ID：21H05404

https://www.rs.tus.ac.jp/yuasaj/member.html

Project title：Development of Pure Blue Thermally Activated Delayed Fluorescence Materials by Dynamic Exciton Control
Leader：Susumu Oda (Assistant Professor, School of Science, Kwansei Gakuin University)
Collaborator：Takuji Hatakeyama (Professor, Graduate School of Science, Kyoto University, Japan)
Project ID：21H05408

https://sci-tech.ksc.kwansei.ac.jp/~hatakeyama/index.html

A02 GroupAnalysis of Dynamic Exciton

Project title：Study of a Role of Non-Fullerene Acceptor’s Large Permanent Quadrupole Moment on the Dissociation Process of Dynamic Exciton
Leader：Hiroyuki Yoshida (Professor, Graduate School of Engineering, Chiba University)
Project ID：21H05384

https://adv.chiba-u.jp/nano/yoshida_lab/

Project title：Charge Separation Mechanism of Dynamic Excitons at Donor/Acceptor Interface
Leader：Yasunari Tamai (Assistant Professor, Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University)
Project ID：21H05394

http://www.photo.polym.kyoto-u.ac.jp/

Project title：Visualization of Time Evolution of Ion-Pair Distance in Dynamic Exciton Using Multiple Excitation
Leader：Hikaru Sotome (Assistant Professor, Graduate School of Engineering Science, Osaka University)
Project ID：21H05395

http://www.chem.es.osaka-u.ac.jp/laser/index.html

Project title：Exciton and Charge Carrier Dynamics in Organic Photovoltaic Cells Studied by Time-Resolved Terahertz Spectroscopy
Leader：Kaoru Ohta (Researcher, Molecular Photoscience Research Center, Kobe University)
Project ID：21H05396

http://www2.kobe-u.ac.jp/~tominaga/

Project title：Analysis of Dynamic Exciton in Singlet Fission
Leader：Taku Hasobe (Professor, Faculty of Science and Technology, Keio University)
Project ID：21H05403

http://www.chem.keio.ac.jp/~hasobe/

Project title：Exploration of Delocalized Frenkel Excitons at Well-Ordered Organic Semiconductor Donor-Acceptor Heterojunctions Exhibiting the Band Transport
Leader：Yasuo Nakayama (Associate Professor, Department of Pure and Applied Chemistry, Tokyo University of Science)
Project ID：21H05405

https://www.rs.tus.ac.jp/oml/index.html

Project title：Development and Application of Real-Time Simulation Methods for Dynamic Exciton Phenomena in Molecular Aggregates
Leader：Hiroki Uratani (Assistant Professor, School of Advanced Science and Engineering, Waseda University)
Collaborator：Hiromi Nakai (Professor, School of Advanced Science and Engineering, Waseda University)
Project ID：21H05407

https://researchmap.jp/huratani?lang=ja

Project title：Spatio-Temporal Control of a Charge Transfer Exciton by Coherent Excitation of Molecular Vibrations
Leader：Kensuke Kimura (Special Postdoctoral Researcher, RIKEN Cluster for Pioneering Research)
Project ID：21H05412

http://www2.riken.jp/Kimlab/index.html

A03 GroupFunction of Dynamic Exciton

Project title：Catalytic Generation of Sulfur Cation Radical Species by Dynamic Exciton and Its Application to Bond Formation Reactions
Leader：Kazunori Nagao (Assistant Professor, Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University)
Project ID：21H05388

https://seimitsu.w3.kanazawa-u.ac.jp

Project title：Development of Visible Light-Driven Methods for Radical Generation Using Dynamic Excitons
Leader：Masakazu Nambo (Designated Associate Professor, Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University)
Project ID：21H05390

https://www.itbm.nagoya-u.ac.jp/ja/members/m-nambo/

Project title：Understanding and Controlling of Exciton Dynamics in Light-Emitting Molecules
Leader：Masashi Mamada (Assistant professor, Faculty of Engineering, Kyushu University)
Project ID：21H05401

http://www.cstf.kyushu-u.ac.jp/~adachilab/lab/

Project title：Dynamical Processes of Charge-Transfer Excitons at the Interface of Organic Thin-Film Solar Cells
Leader：Azusa Muraoka (Associate Professor, Japan Women’s University)
Project ID：21H05406

http://mcm-www.jwu.ac.jp/~muraoka/

Project title：Photon Upconversion Through Dynamic Exciton
Leader：Seiichiro Izawa (Assistant Professor, Institute for Molecular Science)
Project ID：21H05411

https://www.ims.ac.jp/research/assist/izawa.html

Project title：Virtual Screening of “Dynamic Excitions” for OLED Materials
Leader：Naoya Aizawa (Assistant Professor, Graduate School of Engineering, Osaka University)
Project ID：21H05413

https://researchmap.jp/naoya-aizawa/

Advisory

Domestic

Hiroshi Masuhara （Professor Emeritus of Osaka University; Professor at National Yang Ming Chiao Tung University）

Yoshito Tobe（Professor Emeritus of Osaka University; Professor at National Yang Ming Chiao Tung University ）

Katsumi Tokumaru（Professor Emeritus of Tsukuba University）

Shigeyoshi Sakaki（Professor Emeritus of Kyoto University）

Toshihiro Ohnishi（Specially-appointed professor at Osaka University, Fellow of Sumitomo Chemical Corporation）

International

Paul W.M Blom（Professor, Director, Max Planck Institute for Polymer Research, Germany）

https://www.mpip-mainz.mpg.de

Itamar Willner（Professor, Institute of Chemistry, The Hebrew University of Jerusalem, Israel）

http://chem.ch.huji.ac.il/willner/

Prashant V. Kamat（Professor, John A Zahm Professor of Science, University of Notre Dame, USA; Editor-in-Chief in ACS Energy Letters）

https://www3.nd.edu/~kamatlab/

Michael R. Wasielewski（Professor, Department of Chemistry, Northwestern University, USA）

http://chemgroups.northwestern.edu/wasielewski/