An insight into the temperature dependence of photoluminescence of a highly-emissive Cs-Ag(Na)Bi(In)Cl6 perovskite

Abstract

The temperature-dependent evolution of the photoluminescence (PL) properties of a highly emissive Cs₂Ag_0.35Na_0.65Bi_0.02In_0.98Cl₆ perovskite was examined in the range of 80–340 K. The PL maximum exhibited a shift to higher energies with an increase in T, while the bandgap decreased with elevated T. This behavior can be explained by a thermal distribution of the self-trapped exciton states.