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Lead halide perovskite nanocrystals (NCs) in a glass matrix combine excellentoptical properties and stability against environment. Spectral and temporalcharacteristics of photoluminescence from CsPbBr$_3$ and CsPb(Cl,Br)$_3$ NCs ina fluorophosphate glass matrix are measured in a temperature range from 6 to270 K in order to reveal factors limiting their quantum yield and recombinationdynamics. At low temperatures the recombination dynamics are characterized bythree times on the order of 1 ns, 10 ns, and 1 $\mu$s. Relative contributionsof the corresponding processes and their times are strongly temperaturedependent. Emission intensity decreases with growing temperature and thiseffect is stronger in smaller NCs highlighting the role of the surface states.Model considerations accounting for the NC energy structure and presence of thesurface states trapping electrons and hole are provided to describeexperimental appearances. We conclude that the photoluminescence dynamics atlow temperatures are dominated by carrier recombination and relaxation toshallow traps. At temperatures exceeding 100 K, the dynamics are affected byactivation of carriers to the excited states.

Temperature-dependent photoluminescence dynamics of CsPbBr$_3$ and CsPb(Cl,Br)$_3$ perovskite nanocrystals in a glass matrix