Blue-emitting
perovskite nanoplates (NPLs) have been
widely investigated
for display application. However, the traditional synthetic techniques
for high-quality perovskite NPLs are still limited due to their rapid
crystallization rate. Here, we developed an inorganic ligand (NOBF4) mediated transformation strategy to obtain blue-emitting
CsPbBr3 NPLs. The transformation process was based on the
dissolution–recrystallization in a nonpolar environment, involving
the dissociation of Cs4PbBr6 NCs to Pb ions,
which then reformed PbBr64– octahedrons
and finally formed two monolayer NPLs with pure blue-emission (line
width ∼12 nm). The whole transformation process was clearly
detected, and during the process the reorganization of organic ligands
tuned by NO+ played a crucial role in the formation of
NPLs. This work provides an effective strategy for obtaining pure
blue-emitting NPLs and builds a platform for exploring the mechanism
for the anisotropic growth of perovskite crystals.