Water-induced controllable synthesis of CsPbBr3 nanorods/nanocubes from CsBr nanocrystals

Abstract

Lead halide perovskite nanorods (NRs) have attracted widespread attention due to their strong fluorescence polarization, emerging as promising candidates for cutting-edge display technologies. Since the morphology of NRs is mostly correlated with their photoluminescence properties, achieving precise control of NRs is extremely essential. Herein, we present a post-synthetic process for fabricating CsPbBr₃ NRs at room temperature via the transformation of CsBr nanocrystals. Moreover, the precision of shape can be modulated from nanocubes (NCs) to NRs via regulating water amount and the concentrations of ligands in PbBr₂ solutions. In particular, the as-synthesized CsPbBr₃ NRs display significant emission polarization with an anisotropy factor as high as 0.15. The proposed method boosts synthesis efficiency and lays a strong foundation for the forthcoming development of polarized optical devices.