Revealing photoluminescence mechanisms of single CsPbBr/CsPbBr core/shell perovskite nanocrystals.

CsPbBr nanocrystals (NCs) encapsulated by CsPbBr has attracted extensive attention due to good stability and high photoluminescence (PL) emission efficiency. However, the origin of photoluminescence (PL) emission from CsPbBr/CsPbBr composite materials has been controversial. In this work, we prepare CsPbBr/CsPbBr core/shell nanoparticles and firstly study the mechanism of its photoluminescence (PL) at the single-particle level.