Optical and Lasing Characteristics of Inorganic Cesium Lead Bromide Perovskites Micro-platelets Grown by Chemical Vapor Deposition

Abstract

Recently lead halide based perovskites have received outstanding optical properties in photonic device such as solar cell laser etc Compared with the organic-inorganic hybrid lead halide perovskites all-inorganic lead halide such as CsPbX3 (X = I Br Cl) exhibits better stability and relatively larger exciton binding energy In this work we employed vapor-phase route to synthesize all-inorganic cesium lead bromide (CsPbBr3) square-shaped micro-platelets perovskite Optical absorption measurement and power-dependent photoluminescence (PL) results identify the recombination is mainly responsible for excitonic transition PL mapping and Fluorescence Lifetime Imaging (FLIM) results show the superior optical properties of single CsPbBr3 micro-platelet Based on their high crystalline quality and high optical confinement the room-temperature lasing actions with high-quality factor from single micro-platelet were investigated systematically The PL lasing images of single CsPbBr3 micro-platelet reveal the lasing emission escaped from the four corners of the micro-platelet These results indicate the optical resonant cavity belongs to the whispering-gallery-mode (WGM) cavity which is in agreement with the FDTD simulation of the optical field distribution Furthermore the lasing mode spacing with different size of the micro-platelets analysis also confirms the laser cavity can be regarded as the WGM resonator

Date of Award	2018 Aug 28
Original language	English
Supervisor	Hsu-Cheng Hsu (Supervisor)