Photo-and X-ray luminescence spectra of CsPbX3 microcrystals dispersed in a PbX2 (X=Cl, Br) matrix

The CsPbX₃ (X=Cl, Br) microcrystals are obtained in a PbX₂ (X=Cl, Br) matrix doped with Cs ions (C _Cs=0.1–1 mol %). Spectral and kinetic parameters of the intrinsic luminescence of the CsPbX₃ single crystals are presented. For the CsPbCl₃ microcrystals, a quantum-confinement effect is detected, which reveals itself as a decrease in the lifetime of the free exciton luminescence. A mechanism of formation of a CsPbX₃ microcrystal in a PbX₂ matrix is proposed.