Cs2HfCl6和Cs2HfCl6∶Tl晶体的生长、光学和闪烁性能研究

人工晶体学报 ›› 2021, Vol. 50 ›› Issue (5): 803-808.

Cs₂HfCl₆和Cs₂HfCl₆∶Tl晶体的生长、光学和闪烁性能研究

成双良^1,2, 任国浩², 吴云涛²

1.上海理工大学材料科学与工程学院,上海 200082;
2.中国科学院上海硅酸盐研究所,上海 201800

收稿日期:2021-03-09 出版日期:2021-05-15 发布日期:2021-06-15
通讯作者: 吴云涛,博士,研究员。E-mail:ytwu@mail.sic.ac.cn
作者简介:成双良(1996—),男,江苏省人,硕士研究生。E-mail:csl123450@hotmail.com
基金资助:
国家自然科学基金(11975303);上海市自然科学基金(20ZR1473900);上海张江国家自主创新示范区专项发展资金重大项目(ZJ2020-ZD-005);上海市科委“科技创新行动计划”高新技术领域项目(20511107400)

Optical and Scintillation Properties of Cs₂HfCl₆ and Cs₂HfCl₆∶Tl Single Crystals Grown by the Bridgman Method

CHENG Shuangliang^{1, 2}, REN Guohao², WU Yuntao²

1. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200082, China;
2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China

Received:2021-03-09 Online:2021-05-15 Published:2021-06-15

摘要/Abstract

摘要： 本文使用坩埚下降法制备了ø7 mm的未掺杂Cs₂HfCl₆与Cs₂HfCl₆∶0.2%Tl(摩尔分数)单晶,对晶体样品进行了物相、杂质含量、光学和闪烁性能的研究。该晶体属于立方晶系,空间群为Fm3m。在荧光和X射线激发下,未掺杂Cs₂HfCl₆晶体的发光主峰皆为380 nm,对应于自陷激子发光。Cs₂HfCl₆∶0.2%Tl晶体在荧光和X射线激发下,发射光谱中除了存在380 nm处的自陷激子发光,也存在505 nm处Tl⁺的sp-s²跃迁发光。Cs₂HfCl₆和Cs₂HfCl₆∶0.2%Tl晶体的光输出分别为37 000 photons/MeV和36 500 photons/MeV,在662 keV处的能量分辨率皆为3.5%。在¹³⁷Cs源激发下,Cs₂HfCl₆晶体的闪烁衰减时间为0.37 μs (4.2%)、4.27 μs (78.9%)和12.52 μs (16.9%),Cs₂HfCl₆∶0.2%Tl晶体的闪烁衰减时间为0.33 μs (3.5%)、4.09 μs (81.9%)和10.42 μs (14.5%)。

关键词: Cs₂HfCl₆∶Tl, 自陷激子发光, sp-s²跃迁, 闪烁晶体, 坩埚下降法, 能量分辨率

Abstract: The ø7 mm undoped Cs₂HfCl₆ and Cs₂HfCl₆∶0.2%Tl(mole fraction) single crystals were grown by the Vertical Bridgman method. The phase, impurities concentrations, luminescence and scintillation properties of crystal samples were studied. Both crystalsbelong to the cubic crystal structure and the space group of Fm3m. When excited by ultraviolet light and X-ray, both crystals exhibit an emission peak at 380 nm originated from self-trapped excitons emission, and Cs₂HfCl₆∶0.2%Tl crystal exhibits an extra Tl⁺ sp-s² transition induced emission at 505 nm. Cs₂HfCl₆ and Cs₂HfCl₆∶0.2%Tl possess high light yields of 37 000 photons/MeV and 36 500 photons/MeV respectively and both have excellent energy resolutions of 3.5% at 662 keV under excitation of ¹³⁷Cs source. The scintillation decay time of undoped Cs₂HfCl₆ is comprised of 0.37 μs (4.2%), 4.27 μs (78.9%) and 12.52 μs (16.9%). The scintillation decay time of Cs₂HfCl₆∶0.2%Tl is comprised of 0.33 μs (3.5%), 4.09 μs (81.9%) and 10.42 μs (14.5%).

Key words: Cs₂HfCl₆∶Tl, self-trapped exciton emission, sp-s² transition, scintillation crystal, Bridgman method, energy resolution

中图分类号:

O734

成双良, 任国浩, 吴云涛. Cs₂HfCl₆和Cs₂HfCl₆∶Tl晶体的生长、光学和闪烁性能研究[J]. 人工晶体学报, 2021, 50(5): 803-808.

CHENG Shuangliang, REN Guohao, WU Yuntao. Optical and Scintillation Properties of Cs₂HfCl₆ and Cs₂HfCl₆∶Tl Single Crystals Grown by the Bridgman Method[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(5): 803-808.

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Cs₂HfCl₆和Cs₂HfCl₆∶Tl晶体的生长、光学和闪烁性能研究

Optical and Scintillation Properties of Cs₂HfCl₆ and Cs₂HfCl₆∶Tl Single Crystals Grown by the Bridgman Method

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