The growth of Cs3Cu2Br5 and CsCu2Br3 single crystals by cooling crystallization for scintillator application

Abstract

Copper halide perovskite materials have been studied extensively for use in radiation detection in recent years because of their excellent properties. However, there are few research studies on copper bromide perovskite Cs₃Cu₂Br₅ and CsCu₂Br₃ single crystals. In this study, Cs₃Cu₂Br₅ and CsCu₂Br₃ single crystals were prepared by a cooling crystallization method by adjusting the ratio of CsBr to CuBr. The prepared Cs₃Cu₂Br₅ single crystals have a large Stokes shift and exhibit blue emission at 456 nm, with a light yield of 6384 photons per MeV and an energy resolution of 17.5%@662 keV irradiated with a ¹³⁷Cs source.