Paradigm shift of singlet fission by integration with metal/semiconductor

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K19011
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 35:Polymers, organic materials, and related fields
• 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): 2021-07-09 – 2024-03-31
• Keywords: 一重項分裂

Outline of Final Research Achievements

Singlet fission (SF) is a multi-exciton generation reaction that produces two individual triplet excitons (T1 + T1) from one-photon absorption process in two nearby molecules. Since the individual triplet yield ΦT attains up to 200%, it is highly expected to be used for solar energy conversion. In this study, we investigated the occurrence of SF by molecules that do not satisfy the exergonic conditions for SF and the further functionalization of SF by integrated with inorganic materials. We synthesized a series of tetracene dimers, which has exergonic energy conditions, instead of pentacene), and evaluated the detail photophysical processes of intramolecular SF progression. Then, the tetracene derivatives were synthetically integrated with inorganic materials (gold nanocluster) and evaluated for their detail functionalities.

Free Research Field

光化学

Academic Significance and Societal Importance of the Research Achievements

一重項分裂の高効率化を実現するための材料合成の指針だけでなく、SF材料と金属ナノクラスターの融合による特異な励起ダイナミクスが明らかとなったため、学術的意義は意義は十分にあると考えられる。