Precipitation of cesium lead halide perovskite nanocrystals in glasses based on liquid phase separation
Ying Ye, Kai Li, Wenchao Zhang, Chao Liu
Abstract
Abstract Incorporation of cesium lead halide perovskite nanocrystals (CsPbX 3 PNCs, X = Cl, Br, I) into glasses can significantly improve their stabilities and extend their application areas. Precipitation of CsPbX 3 PNCs in glasses is mainly based on thermal treatment; however, the formation of mechanism is not clarified. Here, several in situ methods are employed to illustrate the precipitation mechanism of CsPbX 3 PNCs. It is found that precipitation of CsPbX 3 PNCs in glasses is based on the liquid phase separation in solid amorphous matrix, followed by crystallization in the supercooled state. Liquid phase separation process determines the composition of CsPbX 3 PNCs, and cooling process has strong effect on the crystallinity and quality of CsPbX 3 PNCs. These results clarify the precipitation mechanism of CsPbX 3 PNCs in glasses and provide important guideline for the development of CsPbX 3 PNCs embedded glasses for opto‐electronic applications.