Circularly polarized luminescence property of ceramics with chiral crystal structure

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14598
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 32020:Functional solid state chemistry-related
• Research Institution: Tohoku University (2023); The University of Tokyo (2021-2022)
• Principal Investigator: Kizaki Kazuro 東北大学, 工学研究科, 助教 (00880535)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: キラルセラミックス / 円偏光発光 / 希土類

Outline of Final Research Achievements

The purpose of this study is to clarify the correlation between circularly polarized luminescence (CPL) and crystal structure of chiral ceramic phosphors, and to extend the theory regarding the response to the polarized light of chiral inorganic compounds to fields of luminescence and excited states. In this study, single crystals of chiral ceramic phosphor, LaBSiO5, doped with rare earth ions were grown by the flux method. The chirality of the single crystals was determined by X-ray crystal structure analysis, and the correlation between the chirality of the crystal structure and CPL properties was clarified by CPL measurements. This study demonstrates the potential of chiral ceramic phosphors as CPL materials and provides a basis for a deeper understanding of the CPL properties of rare earth ions in crystals.

Free Research Field

無機物理化学

Academic Significance and Societal Importance of the Research Achievements

本研究では、キラルセラミックスのCPL特性とキラル結晶構造との相関を明らかにした。キラルセラミックス中の希土類イオンのCPLはこれまで少数ながら報告があるが、結晶構造のキラリティを明らかにしたうえでCPLを測定した例は今回が初めてであり、キラル無機物質の偏光応答性についての新たな知見を与えており学術的に意義深い。またセラミックスの化学的・熱的安定性や経済性などを考えると、この結果はキラルセラミックス蛍光体がCPL材料として社会において広く利用できることを示している。