Photoluminescence Properties of Lead Halide Perovskite Nanocrystals Revealed By Single-Dot Spectroscopy

作者：Takumi Yamada, K. Cho, R. Sato, M. Saruyama, T. Teranishi, Yoshihiko Kanemitsu · 发表于：ECS Meeting Abstracts · 年份：2024 · DOI：10.1149/ma2024-02513555mtgabs

Lead halide perovskites have attracted much attention as a new class of optoelectronic device materials because of their outstanding optical, electronic, and transport properties [1,2]. In addition, halide perovskite nanocrystals (NCs), which can be synthesized by simple chemical methods, show near unity photoluminescence (PL) quantum yields, with keeping the superior optoelectronic properties of their bulk counterparts [3,4]. Because of the small orbital degeneracy of the band edge, PL properties of halide perovskite NCs are governed by the formation and recombination dynamics of excitons, trions, and biexcitons [5,6]. Since individual NCs show narrow PL linewidths at low temperatures, multipeak PL structures appear and their origins are an exciton, a trion, and a biexciton. Single dot spectroscopy is a powerful tool to investigate the exciton–exciton, exciton–electron, and exciton–phonon interactions in perovskite NCs. Here, we prepared three types of perovskite NC samples, CsPbBr3, CsPbI3 and FAPbBr3, and studied their PL spectra of single NCs at room temperature and low temperatures. At room temperature, all NCs show PL blinking, and nonradiative Auger recombination of trions and biexcitons determines the PL dynamics [7–10]. At low temperatures, all NC samples show strong PL, and several PL peaks originating a trion, a biexciton, and longitudinal-optical-phonon side bands of an exciton were clearly observed in the low energy side of the strong exciton peak [11–13]. The P...