with promising applications in light‐emitting diodes (LEDs), lasers, photodetectors, solar
cells, and photocatalysis. However, the intrinsic toxicity of Pb and instability of the NCs
impede their broad applications. Shell‐coating is an effective method for enhanced
environmental stability while reducing toxicity by choosing non‐toxic shell materials such as
metal oxides, polymers, silica, etc. However, multiple perovskite NCs can be encapsulated …