Ce^(3+)掺杂Gd_2O_3基闪烁玻璃的研究

The study of Ce^(3+)-doped Gd_2O_3 based scintillating glasses

实验用高温熔融法制备了Ce3+掺杂Gd2O3基闪烁玻璃样品,Gd2O3含量高达40mol%,测试了不同Ce3+掺杂浓度与Gd2O3基含量玻璃样品的密度、透过、发射、激发光谱及部分闪烁性能。研究了不同Ce3+掺杂浓度与Gd2O3基含量对玻璃样品密度及光谱性能的影响规律。结果表明:Gd2O3含量的增加不仅提高了玻璃的密度,有利于提高玻璃的辐射性能,还增大了玻璃的光碱度,增大Stokes位移,有利于提高闪烁光的发光效率;Ce3+浓度的提高增大了Ce3+间碰撞的几率,产生能量损失,表现出浓度淬灭效应。在Gd2O3基闪烁玻璃中,随Gd2O3含量增加激发峰的红移较小,高Gd2O3含量的氧化物玻璃中存在Gd3+→Ce3+能量转移机制,Gd3+离子可有效地向Ce3+离子传递能量,敏化Ce3+离子的发光。玻璃样品的衰减时间在17-37ns之间。Ce3+掺杂Gd2O3基闪烁玻璃有望在高能物理等领域中获得应用。

Ce^3＋ doped high Gd2O3 concentrations oxide glasses are prepared by high-temperature melting method and Gd2O3 content up to 40mol%,and their density,transmission,emission,excitation spectra with different concentration of Ce^3＋ and Gd2O3 and scintillating properties are measured,and the influence of concentration of important constituents（Gd2O3 and Ce） on the density and the luminescence characteristics are analyzed as well.The results show that the density and the optical basicity of glass samples are increased along with the Gd2O3 concentration increasing,the increased density is able to improve the radiation properties and stokes shift caused by increased optical basicities are beneficial to improve the efficiency of scintillation light.With the Ce^3＋ ions concentration increasing,the rate of collisions between Ce^3＋ ions also are increased,resulting in energy losing and showing the concentration quenching effect.The excitation peak red shift is less when the concentration of Gd2O3 is increased in the glasses.The energy transfer from Gd3＋ to Ce^3＋ takes place in the high Gd2O3 concentration of oxides glasses.Gd^3＋ ions sensitize the luminescence of Ce^3＋ ions.The decay times of glass samples are between 17 and 37ns.Ce^3＋ doped high Gd2O3 concentrations oxide glasses is a promising candidate of scintillator for the high-energy physics application and other fields.