2021 Fiscal Year Final Research Report

Development of luminescence properties by the manipulation of interface in Soft Crystals

Planned Research

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Project Area	Soft Crystals: Science and Photofunctions of Easy-Responsive Systems with Felxibility and Higher-Ordering
Project/Area Number	17H06374
Research Category	Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Allocation Type	Single-year Grants
Review Section	Science and Engineering
Research Institution	Aoyama Gakuin University
Principal Investigator	Hasegawa Miki 青山学院大学, 理工学部, 教授 (70306497)
Co-Investigator(Kenkyū-buntansha)	山中正道明治薬科大学, 薬学部, 教授 (10377715) 徐超男国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 総括研究主幹 (70235810)
Project Period (FY)	2017-06-30 – 2022-03-31
Keywords	希土類錯体 / 界面・薄膜 / 発光機能 / ソフトクリスタル / 構造 / 光化学
Outline of Final Research Achievements	The study aims to develop the photo-function of soft crystals with molecular interface specificity. In particular, the molecular association by the wet-film formation process exhibits linearly polarized luminescence. It was expected that the transition dipole transition of the ligand by photoexcitation as the energy donor was related to the polarized luminescence of the acceptor, lanthanide ion. The result which proved this experimentally was obtained. The synthesis of a series of helical rare earth complexes in a unit of soft crystal and the system which explains the relation between the luminescence phenomenon and the distortion of the ligand field were found. For example, a chiral rare earth complex was synthesized and its structure was analyzed, and circularly polarized luminescence and its enhancement in aggregation were clarified. These results have reported widely in international journals as articles, reviews and books.
Free Research Field	金属錯体の光化学
Academic Significance and Societal Importance of the Research Achievements	希土類錯体の発光は光励起によるエネルギー移動を経由している。例えば、ソフトクリスタルとして分子薄膜を累積した系は、配位子そのものの遷移双極子モーメントが効率よく金属イオンに転写されることを見出した。このような系は溶液や粉末では相殺されて現れない現象で、学術的に新しい解釈を実験的に示すことができた。このような、分子レベルの層構造が結晶としてソフトクリスタル現象を示す場合の、原理解明や制御ができれば、新素材へのコンセプト提供となりうる。