A novel Li+-doped CsCu2I3 single crystal for dual gamma–neutron detection

Abstract

Halide perovskites are among the most attractive research hotspots in optoelectronic applications due to their excellent luminescence properties. In this paper, Li⁺ was successfully incorporated into a one-dimensional perovskite CsCu₂I₃ host and constructed as a novel neutron/gamma detection scintillator via the Bridgman method. XRD and ICP-MS were carried out, and the results were discussed. The Li-doped CsCu₂I₃ crystal exhibits a main emission peak at 575 nm originating from strongly localized 1D exciton emission and a high photoluminescence quantum efficiency of 18.7%. The CsCu₂I₃:Li crystal has a light yield of 10 900 photons per MeV and an energy resolution of 11.5% under ¹³⁷Cs irradiation. The figure-of-merit (FoM) of the CsCu₂I₃:Li crystal has been estimated (about 0.8) under ²⁵²Cf radiation source. The crystal has a potential application for dual gamma–neutron detection.