Precipitation of cesium lead halide perovskite nanocrystals in glasses based on liquid phase separation

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.

Stable, Three-Primary Color CsPbX3-Nanocrystal/SiO2 Luminescent Composites via Melt Recrystallization for Backlight Light-Emitting Diodes

“…In this case, the PNCs do not crystallize directly within the MSN but instead melt and penetrate the pores of the MSN after crystallization and then recrystallize during the cooling process. 42 In this work, a melt recrystallization method was successfully applied to coat PNCs with red, green, and blue three-primary color emissions by MSN without using any solvent or organic ligand. The stability of the synthesized CsPbX 3 -nanocrystals/ SiO 2 (PNC/SiO 2 ) composites against high temperature and light excitation was greatly enhanced.…”

“…The normal sintering method to coat CsPbBr 3 by MSN is absorbing the reagents into MSN and then sintering their mixture at around 700 °C for 2 h. However, according to research on the melting and crystallization features of CsPbBr 3 perovskite crystals, ,, CsPbBr 3 will melt at around 570–590 °C through a nonisothermal process and decompose at higher temperatures. In this case, the PNCs do not crystallize directly within the MSN but instead melt and penetrate the pores of the MSN after crystallization and then recrystallize during the cooling process …”