Microwave-assisted synthesis of high-quality “all-inorganic” CsPbX3 (X = Cl, Br, I) perovskite nanocrystals and their application in light emitting diodes

Abstract

As an emerging material for optoelectronic applications, cesium lead halide (CsPbX₃) nanocrystals (NCs) have drawn considerable attention because of their excellent photophysical properties. For the first time, we report a fast and efficient microwave-assisted strategy for the synthesis of high-quality CsPbX₃ NCs with controllable morphologies (nanocube, nanoplate and nanorod). The prepared CsPbX₃ nanocubes show high PLQY, approximately 75%, and narrow full width at half maximum emission line (from 9 to 34 nm) covering the entire spectrum of the visible range. Plate-like and rod-like CsPbBr₃ NCs can also be obtained by attenuating the reaction parameters. A feasible kinetics-controlled growth mechanism of such NCs has been proposed and verified. The as-synthesized CsPbBr₃ NCs show excellent optical performance as a green light source in a white light emitting diode prototype device. This work not only provides a new synthetic path for the preparation of high-quality CsPbX₃ NCs, but also sheds some light on the fundamental study and practical applications of such NCs.