Ultra-high stability of cesium lead halide nanocrystals synthesized by a simple one-pot method

Abstract

Three-dimensional (3D) all-inorganic cesium lead halide perovskite nanocrystals (NCs) have showed significant potential in optoelectronic applications due to their unparalleled optical properties, but it still remains problems in applications, especially their poor stability. Recently, zero-dimensional (0D) all-inorganic cesium lead halide perovskite NCs have been attracted much attention due to the high stability. In order to achieve excellent luminescent performance of perovskite NCs with high stability, it has been proposed a nanostructure of Cs4PbBr6 NCs with embedded CsPbBr3 (CsPbBr3@Cs4PbBr6). In this paper, we developed a simple one-pot synthesis method for CsPbBr3@Cs4PbBr6 NCs, which was processed in octane with oil bath under air ambient and simplify the tedious process of purification. By this method, it was obtained nearly uniform (46 ± 2 nm) CsPbBr3@Cs4PbBr6 NCs with high photoluminescence quantum yield (PLQY, 85.3%, in solution). Moreover, the synthesized CsPbBr3@Cs4PbBr6 NCs powder exhibited remarkable durability with hour-scale photostability, thermostability at 80 °C and long-term storage over 180 days in air. This simplified synthesis method would open a new avenue for simply enhancing the stability of perovskite nanocrystals, and pave a huge potential path for mass production of perovskite nanocrystals.