Luminescence of CsPbCl3 Nanocrystals Dispersed in a CsCl Crystal under High-Energy Excitation

The luminescence spectral and kinetic characteristics of CsPbCl3 nanocrystals, thermally created in a CsCl:Pb single crystal and dispersed in a CsCl matrix, have been studied under excitation by synchrotron radiation in the VUV spectral region (4 to 20 eV). Various components found in the decay kinetics of the 2.98 eV emission have been connected with the direct excitation of the CsPbCl3 luminescence and with the reabsorption of luminescence of other emitting centers by the CsPbCl3 nanocrystals. A high-energy shift of the free exciton emission band maximum of the CsPbCl3 nanocrystals with respect to that observed for a CsPbCl3 single crystal as well as the shortening of the luminescence decay time are considered from the point of view of quantum size effects.