辐照对超快闪烁晶体YAG:Yb闪烁发光的影响研究OA

This study investigated the effects of gamma-ray irradiation from a 137Cs source on the transmittance,photoelectron yield,and cathodoluminescence(CL)emission distribution characteristics of YAG:Yb crystals with various Yb3+doping concentrations(1.5％,15％and 50％,atomic fraction),as well as 15％Yb3+co-doped with 0.05％Na+and 0.05％Ba2+.The results show that the 15％Yb3+doped sample exhibits the strongest radiation-induced absorption after gamma-ray irradiation,while its luminescence uniformity remained relatively stable.The normalized CL intensity shows an increase in the root-mean-square deviation to mean ratio(RMS/Mean)from 3.17％(370 nm)and 3.20％(475 nm)to 5.32％and 4.66％,respectively.In contrast,the 1.5％Yb3+doped sample exhibits weaker radiation-induced absorption but significantly degrade emission uniformity,with the RMS/Mean value for the 370 nm emission increasing from 2.36％to 10.61％.Its photoelectron yield decrease by approximately 22.2％,and the energy resolution deteriorate from 62.0％to 116.6％.These results indicate that under low doping conditions,radiation-induced defects disrupt the spatial uniformity of luminescence,potentially obstructing energy transfer pathways and suppressing charge migration processes,thereby weakening the UV-visible emission.The 50％Yb3+doped sample exhibits pronounced radiation-induced absorption and luminescence non-uniformity after irradiation.However,its photoelectron yield and energy resolution remained relatively stable,which may be attributed to partial compensation of radiation defect effects by structural distortion induced by the high doping concentration.The Na+/Ba2+co-doped samples exhibits optimal performance in both radiation-induced absorption suppression and luminescence stability,suggesting that appropriate co-doping can inhibit defect formation and enhance the crystal's radiation resistance.The comprehensive results demonstrate that the radiation resistance of YAG:Yb crystals is influenced not only by radiation-induced defect absorption but also closely related to the regulation of luminescence uniformity by crystal defects.