Cathodoluminescence spectral and lifetime mapping of Cs4PbBr6: fast lifetime and its scintillator application

Highly efficient green emission of Cs 4 PbBr 6 has been attributed to intermediate states formed by embedded CsPbBr 3 nanocrystals or defects. However, direct experimental confirmation of the presence of such nano-emitters is not straightforward and the emission mechanism remains elusive. By using cathodoluminescence (CL) imaging with a high spatial resolution, we demonstrate that CsPbBr 3 nanocrystals within the Cs 4 PbBr 6 matrix contribute to the green emission, exhibiting optical behavior distinct from the matrix. Additionally, we explore its potential as an electron beam scintillator, given its high CL intensity and exceptionally short lifetime.