Y^(3+)/Li^(+)和Y^(3+)/Na^(+)双掺杂氟化钡快响应闪烁晶体  

Y^(3+)/Li^(+)and Y^(3+)/Na^(+)Co-Doped Barium Fluoride Fast Response Scintillation Crystal

作　　者：杨蕾 张明荣[1] 刘建强 侯越云 胡久奎 闫晋力[1] 张春生[1] YANG Lei;ZHANG Mingrong;LIU Jianqiang;HOU Yueyun;HU Jiukui;YAN Jinli;ZHANG Chunsheng(Beijing Glass Research Institute Co.,Ltd.,Beijing 101111,China;Beijing Scitlion Technology Co.,Ltd.,Beijing 101111,China)

机构地区：[1]北京玻璃研究院有限公司,北京101111 [2]北京首量科技股份有限公司,北京101111

出　　处：《人工晶体学报》2022年第12期1997-2002,共6页Journal of Synthetic Crystals

摘　　要：氟化钡(BaF_(2))晶体是已知响应最快的闪烁晶体,在高能物理、核物理及核医学等领域有着广泛的应用前景。抑制BaF_(2)晶体的慢发光成分对其工程应用至关重要。本文利用坩埚下降法制备了高Y^(3+)掺杂浓度5%、8%、10%(摩尔分数)的BaF_(2)晶体,并采用Y^(3+)与碱金属离子(Li^(+)、Na^(+))共掺杂的方法形成电荷补偿阻止间隙F-的产生,制备了双掺杂型BaF_(2)快响应闪烁晶体,进而基于优化的5 ns和2500 ns时间门宽测试方法,研究了Y^(3+)掺杂浓度以及Y^(3+)与碱金属离子(Li^(+)、Na^(+))共掺杂浓度对BaF_(2)闪烁晶体快/慢成分比的影响规律。结果表明,生长的高浓度Y^(3+)掺杂BaF_(2)晶体的光学质量优异,在220 nm和300 nm处透过率分别高于90%和92%;随着Y^(3+)掺杂浓度由0提高至10%,BaF_(2)晶体的慢发光成分显著降低,快/慢成分比由0.15提高至1.21;生长的Y^(3+)/Li^(+)及Y^(3+)/Na^(+)共掺杂BaF_(2)晶体的慢发光成分较Y^(3+)掺杂BaF_(2)晶体进一步降低,快/慢成分比最高分别可达1.63和1.61。研制的双掺杂BaF_(2)快响应闪烁晶体有望应用于高能物理、核物理前沿实验等重要领域。Barium fluoride(BaF_(2))crystal is known as the fastest scintillation crystal,which has a wide application prospect in high energy physics,nuclear physics and nuclear medicine.It is very important to suppress the slow luminescence component of BaF_(2)crystal for its engineering application.BaF_(2)crystals with high Y^(3+)doping concentration 5%,8%,10%(mole fraction)were prepared by Bridgman method,and the co-doped BaF_(2)fast response scintillation crystals were prepared by co-doping Y^(3+)with alkali metal ions(Li^(+),Na^(+))to form charge compensation to eliminate the generation of interstitial F-.Then,based on the optimized 5 ns and 2500 ns time gate width measurement methods,the effects of Y^(3+)doping concentration and the co-doping concentration of Y^(3+)and alkali metal ions(Li^(+),Na^(+))on the fast/slow component ratio of BaF_(2)scintillation crystal were studied.The results show that the optical quality of the high concentration Y^(3+)doped BaF_(2)crystals is excellent,and the transmittance at 220 nm and 300 nm is higher than 90%and 92%,respectively.With the increase of Y^(3+)doping concentration from 0 to 10%,the slow luminescence component of BaF_(2)crystal decrease significantly,and the fast/slow component ratio increase from 0.15 to 1.21.The slow luminescence component of the grown Y^(3+)/Li^(+)and Y^(3+)/Na^(+)co-doped BaF_(2)crystals are further decrease compared with that of the Y^(3+)doped BaF_(2)crystals,and the highest fast/slow component ratios obtained are 1.63 and 1.61,respectively.The co-doped BaF_(2)fast response scintillation crystal is expected to be applied in the frontier experiments of high energy physics and nuclear physics.

关 键 词：氟化钡 闪烁晶体 共掺 快/慢成分比 快响应 坩埚下降法 

分 类 号：O78[理学—晶体学]