Mn2+-Doped Cs3Cu2I5 Halides and their application for High resolution of X-Ray imaging and Thermal Neutron Detection

Abstract

In this study, Mn2+-doped Cs3Cu2I5 powders were synthesized via a solution-based method, and their potential applications in X-ray and thermal neutron detection were explored. By optimizing the trace doping concentration, it was found that the incorporation of Mn2+ effectively modified defect states, enhanced photoluminescence (PL) intensity, and increased the Stokes shift, thereby significantly reducing self-absorption. In X-ray imaging, the doped samples achieved a maximum spatial resolution of 16 lp/mm, surpassing most known halide materials. Additionally, by incorporating this material with 6LiF to fabricate thin films for thermal neutron detection, experimental results demonstrated that at a doping concentration of 50 ppm, achieved a light yield of approximately 24500 photons per thermal neutron, nearly 3.5 times that of the commercial GS20 (7000 photons per thermal neutron). and clear discrimination between neutron and gamma signals from the same source was achieved. These findings highlight the significant potential of Mn2+-doped Cs3Cu2I5 for mixed high-energy radiation detection applications. Key word Mn2+ doping, X-ray detection, Thermal neutron detection, Scintillator materials