Cu+或Ag+共掺杂LaBr3∶Ce晶体的生长及性能研究OA

LaBr∶3 Ce crystals are recognized as representative high-performance scintillators due to their outstanding properties such as high light yield,excellent energy resolution,and fast decay time,demonstrating significant application potential in fields including nuclear radiation detection and medical imaging.In this study,Cu+or Ag+co-doped LaBr3∶Ce crystals were successfully grown by the Bridgman method,and the effects of different Cu+or Ag+co-doping concentrations on their luminescence and scintillation performances of LaBr3∶Ce crystals were systematically investigated.The results show that under both photoluminescence and X-ray excitation,neither Cu+nor Ag+co-doping alters the luminescence mechanism of the crystals.All samples exhibit the 5d→4f characteristic emission of Ce³⁺ in the range of 325～425 nm.In terms of scintillation performance,the light yields and energy resolutions of Cu⁺ co-doped crystals are comparable to those of undoped sample.Specifically,the LaBr3∶Ce,0.2%Cu crystal achieves an energy resolution of 2.8%at 662 keV.In contrast,Ag⁺ co-doping leads to a significant decrease in the light yield of crystal.The LaBr3∶Ce,0.2%Ag crystal exhibits an energy resolution deteriorated to 4.5%at 662 keV.These findings indicate that neither Cu⁺ nor Ag⁺ co-doping strategy improves the scintillation performance of LaBr3∶Ce,providing an important experimental guidance for the selection of future doping strategies in this system.