Cs_2LiYCl_6:Ce闪烁晶体的光学及闪烁性能  

Optical and Scintillation Properties of Cs_2LiYCl_6:Ce Crystal

作　　者：王晴晴[1,2] 史坚[2] 李焕英[2] 陈晓峰[2] 潘尚可[3] 卞建江[1] 任国浩[2] WANG Qing-Qing SHI Jian LI Huan-Ying CHEN Xiao-Feng PAN Shang-Ke BIAN Jian-Jiang REN Guo-Hao(School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China State Key Laboratory Base of Novel Function Materials and Preparation Science, School of Material Sciences and Chemical Engineering, Ningbo University, Ningbo 315211, China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]中国科学院上海硅酸盐研究所,上海201800 [3]宁波大学材料科学与化学工程学院,宁波315211

出　　处：《无机材料学报》2017年第2期175-179,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(51272263;11475242)~~

摘　　要：用坩埚下降法生长得到Cs_2LiY_(0.95)Cl_6:5%Ce(CYLC)闪烁晶体,通过X射线衍射分析证明Cs_2LiYCl_6:Ce的晶体结构属于钾冰晶石结构,并与理论计算结果基本吻合。在吸收光谱中观测到源于Ce^(3+)离子从4f向5d1~5电子跃迁的吸收峰和自陷激子吸收峰。X射线和紫外激发和发射光谱测试表明,位于300 nm的发光属于Cs_2LiYCl_6:Ce晶体的本征芯价发光,321 nm的发光归因于自陷激子发光,350~450 nm范围的发光属于Ce^(3+)离子5d-4f跃迁发光。在37Cs源伽马射线激发下,CYLC晶体的能量分辨率达到8.1%,衰减时间分别为58 ns和580 ns。综上所述可知,Cs_2LiYCl_6:Ce晶体将是一种在中子和伽马射线分辨领域具有广泛应用前景的闪烁晶体。Crystal structure of Cs2LiY0.95Cl6：5%Ce crystal （CYLC） grown by vertical Bridgement method from polycrystal raw materials was measured by X-ray diffraction （XRD） and was proved to have elpasolite structure. The detected structure of Cs2LiYCl6：Ce crystal was agreed well with theoretical structure. Six optical absorption bands which are suggested to originate from the transition of electron from 4f to 5d1-5 of Ce ions and self-trapped excition （STE）, can be identified in the absorption spectra of the CLYC：Ce crystal. X-ray and ultraviolet excited luminescence spectra of Cs2LiY0.9sCl6：5%Ce crystal present an emission band from 350 nm to 450 nm correspond- ing to 5d-4f transitions of Ce3＋ ions. The peaks locating at 300 nm and 321 nm can be ascribed to core to valence luminescence and STE luminescence. Under the excitation of γ-rays from 137Cs, Cs2LiY0.gsCl6：5%Ce crystal presents energy resolution of 8.1%, and scintillation decay time of 58 ns and 580 ns. All of these properties show that Cs2LiYCl6：Ce crystal is a promising scintillator for neutron and gamma detection applications.

关 键 词：Cs2Li YCl6:Ce晶体 坩埚下降法 晶体结构 闪烁性能 

分 类 号：O734[理学—晶体学]