Control of circular polarized photoluminesence of organic-inorganic perovskites using chiral molecules

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05271
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 28030:Nanomaterials-related
• Research Institution: Sophia University
• Principal Investigator: TAKEOKA Yuko 上智大学, 理工学部, 教授 (50338430)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: ペロブスカイト / 発光材料 / 円偏光

Outline of Final Research Achievements

We aimed to develop CPL by introducing a chiral moiety into the organic part of an organic-inorganic perovskite compounsd obtained from organic amine and metal halides. By examining several chiral amines, we selected the amine structure with the strongest CD intensity.
We also established a method for synthesizing nanocrystals. The obtained nanocrystals were found to be monochromatic and highly luminescent. They were stable for several days and maintained their luminescence. The emission wavelength was dependent on the halogen species, and the inversion of circularly polarized emission was also confirmed for the R- and S-chiral species. This indicates that the strong luminescence derived from the quantum confinement of the perovskite compound is effective for the expression of CPL.

Free Research Field

Material Science

Academic Significance and Societal Importance of the Research Achievements

円偏光特性を示す発光材料は近年注目を集めている。一般光には右と左回転の二種類の円偏光発光(CPL)が混在している。片方の円偏光のみからなる発光を得ることができれば、三次元ディス現状では十分なCPLを示す材料は限られている。本研究では太陽電池への応用で注目を集める有機無機ペロブスカイト化合物の高い発光性に着目し、この有機層に光学活性な分子を導入することで円偏光発光性をもたせ、さらにこれをナノ粒子化することで発光強度の向上を行った。光学活性基の種類を変化させることで円偏光特性の大きさと、円偏光発光の反転が可能とななった。さらなるデバイス研究により、CPL光源への利用が期待される。