Development of efficient circularly polarized phosphorescent chiral platinum complexes

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K20541
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
• Research Institution: Nihon University
• Principal Investigator: IKESHITA Masahiro 日本大学, 生産工学部, 助手 (10908776)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Keywords: 円偏光発光 / 円二色性 / キラル / 遷移金属錯体 / 燐光発光 / 白金錯体

Outline of Final Research Achievements

In this study, we aim to create square planar platinum complexes that exhibit highly efficient circularly polarized phosphorescence for application in next-generation optical information technologies such as three-dimensional displays and security devices. In particular, we have conducted fundamental research to investigate the relationship between the structure and aggregation state of transition metal complexes and their circularly polarized luminescence properties, which is intended to be used as highly functional materials.
As a result of the research, we succeeded in developing new chiral platinum complexes based on Schiff base ligands and observed highly efficient circularly polarized phosphorescence in various states, such as dilute solutions, polymer dispersion films, and solvent-free liquids. We also succeeded to develop zinc and boron complexes that exhibit circularly polarized luminescence.

Free Research Field

錯体化学・有機光化学

Academic Significance and Societal Importance of the Research Achievements

本研究では、金属錯体の配位構造に由来するキラリティーに注目し、種々のキラル光物性制御法の開発を目指して研究を遂行した。円偏光発光をはじめとするキラル光物性は、光暗号化技術や3Dディスプレイなどに応用が期待される技術であるが、高効率なキラル光学特性を示す分子の設計指針の確立が求められている。今回は、金属配位平面の配位キラリティーに着目し、キラル構造を強く円偏光発光などの光物性に反映できるユニークな発光性分子を構築できた点は学術および社会的にも意義深いと考えている。