Excitons in CsPbBr Halide Perovskite.

Excitons in Bridgman grown halide perovskite CsPbBr single crystals were examined using photoluminescence (PL) spectroscopy to determine the nature of the electronic states. The photoluminescence intensity was strongly temperature-dependent and depended upon the specific exciton band. At low temperatures intrinsic disorder and its related shallow below bandgap tail states determine the emission properties.