Presentation Information
[22a-P02-23]High photoluminescence quantum yield of perovskite quantum dots by passivating Alkali Metal for A site defect
〇(B)Koei Oikawa1, Yusaku Morikawa2, Satoshi Asakura3, Takayuki Chiba4,5, Akito Masuhara2,5 (1.Eng., Yamagata Univ., 2.Grad. Sch. of Sci. and Eng., Yamagata Univ., 3.Ise Chem. Corp., 4.Grad. Sch. of Org. Mat. Sci., Yamagata Univ., 5.FROM, Yamagata Univ.)
Keywords:
Perovskite,Nanocrystals,AlKali Metal
ABX3 typed perovskite quantum dots (PeQDs) have attracted attention as a next-generation optical material because of their optical properties such as high color purity and wide color gamut. However, the photoluminescence quantum yield (PLQY) degradation of these PeQDs is an issue for the practical use of PeQDs. In detail, the A site defects promoted the desorption of X site. Subsequently, X site defect-derived trap levels were generated, which promoted non-radiative deactivation and decreased the PLQY. Herein, alkali metals with ionic radii smaller than the Cs of the reference A site were added to PeQDs. By adding the alkali metal in PeQDs, the desorption of the X site was suppressed and the PLQY of PeQDs improved from 25.8% to 85.8%.