Cs2LiYCl6:Ce闪烁晶体的光学及闪烁性能

doi:10.15541/jim20160307

无机材料学报 ›› 2017, Vol. 32 ›› Issue (2): 175-179.DOI: 10.15541/jim20160307

Cs₂LiYCl₆:Ce闪烁晶体的光学及闪烁性能

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

(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)

收稿日期:2016-05-10 修回日期:2016-07-22 出版日期:2017-02-20 网络出版日期:2017-01-13
作者简介:王晴晴(1991–), 女, 硕士研究生. E-mail: 13120856938@163.com
基金资助:
国家自然科学基金(51272263, 11475242)

Optical and Scintillation Properties of Cs₂LiYCl₆:Ce Crystal

WANG Qing-Qing^1,2, SHI Jian², LI Huan-Ying², CHEN Xiao-Feng², PAN Shang-Ke³, BIAN Jian-Jiang¹, REN Guo-Hao²

(1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China; 3. State Key Laboratory Base of Novel Function Materials and Preparation Science, School of Material Sciences and Chemical Engineering, Ningbo University, Ningbo 315211, China)

Received:2016-05-10 Revised:2016-07-22 Published:2017-02-20 Online:2017-01-13
About author:WANG Qing-Qing. E-mail: 13120856938@163.com
Supported by:
National Natural Science Foundation of China (51272263, 11475242)

摘要/Abstract

摘要：

用坩埚下降法生长得到Cs₂LiY_0.95Cl₆: 5%Ce(CYLC)闪烁晶体, 通过X射线衍射分析证明Cs₂LiYCl₆: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Ce³⁺离子从4f向5d_1~5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Cs₂LiYCl₆: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Ce³⁺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, Cs₂LiYCl₆: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。

关键词: Cs2LiYCl6:Ce晶体, 坩埚下降法, 晶体结构, 闪烁性能

Abstract:

Crystal structure of Cs₂LiY_0.95Cl₆:5%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 5d_1~5 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 Cs₂LiY_0.95Cl₆:5%Ce crystal present an emission band from 350 nm to 450 nm corresponding 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, Cs₂LiY_0.95Cl₆:5%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.

Key words: Cs2LiYCl6:Ce crystal, vertical Bridgement method, crystal structure, scintillation property

中图分类号:

O734

王晴晴, 史坚, 李焕英, 陈晓峰, 潘尚可, 卞建江, 任国浩. Cs₂LiYCl₆:Ce闪烁晶体的光学及闪烁性能[J]. 无机材料学报, 2017, 32(2): 175-179.

WANG Qing-Qing, SHI Jian, LI Huan-Ying, CHEN Xiao-Feng, PAN Shang-Ke, BIAN Jian-Jiang, REN Guo-Hao. Optical and Scintillation Properties of Cs₂LiYCl₆:Ce Crystal[J]. Journal of Inorganic Materials, 2017, 32(2): 175-179.

图/表 8

图1 生长的ϕ25 mm的Cs2LiYCl6:5%Ce晶体毛坯的照片

Fig. 1 Photos of as-grown ϕ25 mm Cs2LiYCl6:5%Ce crystal

图2 Cs2LiYCl6:5%Ce粉末样品的XRD图谱

Fig. 2 XRD pattern of Cs2LiYCl6:5%Ce powder

图3 室温下测试的Cs2LiYCl6:5%Ce样品的透过和吸收光谱

Fig. 3 Transmission and absorption spectra of Cs2LiYCl6: 5%Ce at room temperature

图4 室温下Cs2LiYCl6:5%Ce样品监测发射峰分别为321、374、402 nm处的激发光谱

Fig. 4 Photoluminescence excitation spectra of Cs2LiYCl6: 5%Ce crystal monitored with 321 nm, 374 nm, and 402 nm at room temperature

图5 室温下Cs2LiYCl6:5%Ce样品在激发光波长为215、238、252、271、307、341 nm时的发射光谱

Fig. 5 Photoluminescence emission spectra of Cs2LiYCl6: 5%Ce crystal monitored with 215 nm, 238 nm, 252 nm, 271 nm, 307 nm, and 341 nm at room temperature

图6 Cs2LiYCl6:5%Ce样品的X射线激发发射光谱图

Fig. 6 X-ray excited luminescence spectra of Cs2LiYCl6: 5%Ce

图7 室温下Cs2LiYCl6:5%Ce晶体在137Cs源伽马射线激发下的衰减时间曲线

Fig. 7 Decay curve and its fitted line of Cs2LiYCl6:5%Ce crystal excited by 137Cs Gamma-ray at room temperature

图8 室温下Cs2LiYCl6:5%Ce样品和NaI(Tl)标样在137Cs源激发下的多道能谱

Fig. 8 Multi-channel energy spectra of Cs2LiYCl6:5%Ce crystal and CsI(Tl) crystal excited by 137Cs

参考文献 15

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Cs₂LiYCl₆:Ce闪烁晶体的光学及闪烁性能

Optical and Scintillation Properties of Cs₂LiYCl₆:Ce Crystal

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