New Developments of Multi-exciton Generation Processes by Multiple Molecular Cooperation

2024 Fiscal Year Final Research Report

• Project/Area Number: 21H01908
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 32020:Functional solid state chemistry-related
• Research Institution: Keio University
• Principal Investigator: Hasobe Taku 慶應義塾大学, 理工学部(矢上), 教授 (70418698)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 一重項分裂

Outline of Final Research Achievements

Photochemistry of molecular assemblies encompasses various fields ranging from light energy conversion and electronics to medical applications. However, a serious problem is that the absorbed excitation energy is quickly deactivated by exciton-exciton annihilation, etc., compared to monomers. A solution to this problem is to utilize singlet fission (SF), in which the quantum yield of triplet excitons is 200% in two neighboring molecules. In this research project, we achieve innovative functionalities not found in conventional SF systems through cooperative multiple molecules. Specifically, in addition to the conventional pentacene dimers , we have observed highly efficient SF by tetracene dimers and oligomers, and integration of multiple exciton generation reactions by quantum dots and acene dimers, which are important findings for highly efficient solar energy conversion.

Free Research Field

光化学

Academic Significance and Societal Importance of the Research Achievements

従来の有機薄膜の一重項分裂に対して、化学結合で色素間相互作用を厳密に制御した分子集合体を合成し、高効率な一重項分裂を示すことができたので材料開発という観点で重要な成果を示すことができた。