Photoluminescence of Cs4PbBr6 crystals and thin films

Abstract Absorption, emission and decay kinetics characteristics of Cs 4 PbBr 6 bulk and thin film samples were measured in the UV–visible spectral range over 4.2–250 K. An emission band at 375 nm was ascribed to the Cs 4 PbBr 6 structure itself with two excitation maxima round 310 and 240 nm coinciding with absorption peaks in the thin film absorption spectrum. The coexistence of Cs 4 PbBr 6 and CsPbBr 3 phases was evidenced in both the bulk and thin film systems.