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Owing to their outstanding optoelectronic properties, all-inorganic CsPbBr3 perovskite nanocrystals (NCs) are regarded as excellent materials for various optoelectronic applications. Unfortunately, their practical applications are limited by poor stability against water, heat, and polar solvents. Here, we propose a facile synthesis strategy for CsPbBr3@Cs4PbBr6 NCs via tetraoctylammonium bromide ligand induction at room temperature. The resulting CsPbBr3@Cs4PbBr6 NCs show a high photoluminescence quantum yield of 94%. In order to prevent Cs4PbBr6 from being converted back to CsPbBr3 NCs when exposed to water, a second coating layer of SiO2 is formed on the surface of the CsPbBr3@Cs4PbBr6 NCs by the facile hydrolysis of tetramethoxysilane. The resulting CsPbBr3@Cs4PbBr6/SiO2 NCs with their double coating structure have outstanding stability against not only a polar solvent (ethanol) but also water and heat. The as-prepared CsPbBr3@Cs4PbBr6/SiO2 NCs serve as green emitters in efficient white light-emitting diodes (WLEDs) with a high color rendering index (CRI) of 91 and a high power efficiency 59.87 lm W−1. Furthermore, the use of these WLEDs in visible light communication (VLC) results in a maximum rate of 44.53 Mbps, suggesting the great potential of the reported methods and materials for solid-state illumination and VLC.
Li et al. (Tue,) studied this question.