Investigations of luminescence kinetics properties of CsPbCl 3 microcrystals dispersed in RbPbCl 3 matrices have been carried out under excitation with synchrotron radiation in the energy region E exc = 4 -20 eV. Different time components are registered in the decay kinetics of CsPbCl 3 microcrystals, appearing due to the direct excitation of the microcrystals or reabsorption of the intrinsic emission of the RbPbCl 3 matrix. A shortening of the luminescence decay time of the CsPbCl 3 microcrystals with respect to that observed for a CsPbCl 3 single crystal can be explained as evidence of the quantum size effect.
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