1英寸Cs2LiLaBr6∶Ce闪烁晶体的生长及性能研究

人工晶体学报 ›› 2021, Vol. 50 ›› Issue (10): 1879-1882.

1英寸Cs₂LiLaBr₆∶Ce闪烁晶体的生长及性能研究

何君雨¹, 李雯^1,2, 魏钦华¹, 童宇枫¹, 吴云涛², 杨洁男¹, 向鹏¹, 秦来顺¹

1.中国计量大学材料与化学学院,杭州 310018;
2.中国科学院上海硅酸盐研究所,人工晶体研究中心,上海 201899

收稿日期:2021-08-27 出版日期:2021-10-15 发布日期:2021-11-24
通讯作者: 秦来顺,博士,教授。E-mail:qinlaishun@126.com
作者简介:何君雨(1996—),女,河南省人,硕士研究生。E-mail:yulio233@163.com。秦来顺(1978—),男,中国计量大学材料与化学学院副院长、教授。中国稀土学会稀土晶体专业委员会委员,《人工晶体学报》编委,全国人工晶体标准化技术委员会委员,CSTM基础与共性、人工晶体、光学晶体等标委会委员。研究方向为无机闪烁晶体材料、材料评价与标准化,致力于高性能闪烁晶体的材料设计、性能改性、装备提升、工程化与标准化。主持了国家自然科学基金4项、国防JG项目2项、国家国际科技合作项目1项等,参与制定国家标准2项、行业标准2项、团体标准10项,授权发明专利4项,获得江西省科学技术进步二等奖、浙江省自然科学三等奖、宁波市科学技术一等奖等4项。
基金资助:
国家自然科学基金(11975220,51972291);核探测与核电子学国家重点实验室资助项目(SKLPDE-KF-202110);国防科技工业核材料技术创新中心项目(ICNM-2021-ZH-13)

Growth and Properties of 1-Inch Cs₂LiLaBr₆:Ce Scintillation Crystal

HE Junyu¹, LI Wen^1,2, WEI Qinhua¹, TONG Yufeng¹, WU Yuntao², YANG Jienan¹, XIANG Peng¹, QIN Laishun¹

1. School of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China;
2. Artificial Crystals Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China

Received:2021-08-27 Online:2021-10-15 Published:2021-11-24

摘要/Abstract

摘要： Cs₂LiLaBr₆∶Ce(CLLB∶Ce)晶体n/γ双读出闪烁性能优异,其实用化瓶颈在于大尺寸、高光学质量晶体的生长。本研究采用非化学计量比配比,避开CLLB∶Ce非一致熔融组分区域,通过改进研制坩埚下降法晶体生长炉,并优化温度场和降低坩埚下降速度等晶体生长工艺,从而克服组分过冷,保持生长界面稳定,得到了直径1英寸(1英寸=2.54 cm)的CLLB∶Ce晶体毛坯,等径透明部分长度达40 mm,单晶比例由52%提高至79%,可见光区光学透过率达到70%以上。在¹³⁷Cs激发下能量分辨率达3.7%,在²⁵²Cf激发下晶体的品质因子达到1.42,可以很好地甄别中子和γ射线。

关键词: CLLB∶Ce, 闪烁晶体, 坩埚下降法, 组分过冷, 光学透过率, 中子探测

Abstract: Cs₂LiLaBr₆:Ce(CLLB:Ce)crystal has excellent neutron-gamma dual readout performance, while its application bottleneck is to grow single crystals with large size and high optical quality. In this study, non-stoichiometric ratio was used to avoid the phase region of in-congruent CLLB:Ce. By improved Bridgman furnace, optimizing the temperature field and reducing the lowering speed, the constitutional supercooling was overcame and the stability of the growth interface was maintained during the crystal growth process. 1-inch diameter CLLB:Ce crystal ingot was obtained, the length of the equal diameter transparent part is 40 mm, the proportion of single crystal increases from 52% to 79%, and the optical transmittance in the visible light region is above 70%. The energy resolution of CLLB:Ce is about 3.7% under ¹³⁷Cs excitation while the Figure-of-Merit of CLLB:Ce is about 1.42 under ²⁵²Cf excitation. This shows good properties for discriminating gamma-ray and neutron.

Key words: CLLB:Ce, scintillation crystal, Bridgman method, constitutional supercooling, optical transmittance, neutron detection

中图分类号:

何君雨, 李雯, 魏钦华, 童宇枫, 吴云涛, 杨洁男, 向鹏, 秦来顺. 1英寸Cs₂LiLaBr₆∶Ce闪烁晶体的生长及性能研究[J]. 人工晶体学报, 2021, 50(10): 1879-1882.

HE Junyu, LI Wen, WEI Qinhua, TONG Yufeng, WU Yuntao, YANG Jienan, XIANG Peng, QIN Laishun. Growth and Properties of 1-Inch Cs₂LiLaBr₆:Ce Scintillation Crystal[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(10): 1879-1882.

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1英寸Cs₂LiLaBr₆∶Ce闪烁晶体的生长及性能研究

Growth and Properties of 1-Inch Cs₂LiLaBr₆:Ce Scintillation Crystal

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