[15p-K402-1~9] 12.8 Specific theme: Photoelectric Properties, Device Fabrication and Structural Controls of Organic-Inorganic Hybrid Perovskites

3:00 PM - 3:15 PM JST(6:00 AM - 6:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[15p-K402-8] Improvement of the light stability of halide perovskite quantum dots by surface modification with alkali metals

〇Yusaku Morikawa¹, Ryota Kobayashi², Satoshi Asakura³, Motofumi Kashiwagi⁴, Takayuki Chiba^2,5, Akito Masuhara^1,5 (1.Grad. Sch. of Sci. and Eng., Yamagata Univ., 2.Grad. Sch. of Org. Mat. Sci., Yamagata Univ., 3.Ise Chem. Corp., 4.Zeon Corp., 5.FROM, Yamagata Univ.)

Keywords:

Perovskite quantum dot,Surface modification,Photostability

Perovskite quantum dots (PeQDs) have attracted attention as light-emitting materials for next-generated displays due to their high optical properties. However, PeQDs exhibit low stability under light irradiation, which remains a significant challenge for their practical application. Upon exposure to light, the protective ligands on the surface of PeQDs are detached, leading to the formation of surface defects. These defects create trap states within the band structure of the PeQDs, resulting in non-radiative recombination and a decrease in photoluminescence quantum yield (PLQY). To solve these issues, this study incorporated potassium, which has a smaller ionic radius than the A-site cations in PeQDs, to enhance the binding interaction between the A-site and X-site ions on the surface of the PeQDs and suppress ligand desorption. As a result, we succeeded in suppressing the formation of surface defects and achieved high photostability.