Optical properties of Pb-based aggregated phases in CsBr crystal

The emission and excitation spectra as well as luminescence decay kinetics of a CsBr:Pb (1.0 mol%) crystal have been measured under pulsed synchrotron radiation excitation. The heat-treated (∼200∘C) crystal shows evidence of single lead centres and aggregated phases such as CsPbBr3 nanocrystals. The latter have been identified from comparison of the spectral-kinetic characteristics of the CsPbBr3 aggregated phases and single crystals. The process of energy transfer from the host to the aggregates is considered.