Crystal Growth and Scintillation Properties of Non‐Stoichiometric Cs2LiLaBr6:Ce,Crystal Research and Technology

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Crystal Growth and Scintillation Properties of Non‐Stoichiometric Cs2LiLaBr6:Ce
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2019-08-25 , DOI: 10.1002/crat.201900047
Jia Lin ₁ , Qinhua Wei ₁ , Di Zhang ₁ , Gao Tang ₁ , Laishun Qin ₁ , Hongsheng Shi ₁

Affiliation

Because of incongruent melting, phase separation occurs when Cs₂LiLaBr₆:Ce (CLLB:Ce) is grown from a melt using stoichiometric raw materials. In this study, raw materials with different amounts of excess LiBr are used to grow CLLB:Ce crystals. It is found that enough excess of LiBr is beneficial to the crystal growth of CLLB:Ce. A transparent 1 × 2‐in. CLLB:Ce single crystal is successfully grown by the vertical Bridgman method. The differential scanning calorimeter‐thermogravimetric analysis (DSC‐TG), X‐ray diffraction, and inductively coupled plasma mass spectrometry results are used to understand the crystallization behavior at different stages of the crystal growth process. The luminescence and related scintillation properties of the CLLB:Ce single crystal are investigated. The relative light output of the CLLB:Ce single crystal is about 48 000 ph MeV⁻¹, which is 80% that of the LaBr₃:Ce crystal. The energy resolution of the CLLB:Ce single crystal is 4.0% at ¹³⁷Cs 662 keV.

中文翻译：

非化学计量比的Cs2LiLaBr6：Ce的晶体生长和闪烁特性

由于熔融不均匀，当Cs ₂ LiLaBr ₆发生相分离：Ce（CLLB：Ce）使用化学计量的原料从熔体中生长。在这项研究中，使用具有不同量的过量溴化锂的原材料来生长CLLB：Ce晶体。发现足够过量的LiBr有利于CLLB：Ce的晶体生长。透明的1×2英寸 CLLB：Ce单晶通过垂直Bridgman方法成功生长。差示扫描量热计热重分析（DSC-TG），X射线衍射和电感耦合等离子体质谱分析结果用于了解晶体生长过程不同阶段的结晶行为。研究了CLLB：Ce单晶的发光特性和相关的闪烁特性。CLLB：Ce单晶的相对光输出约为48 000 ph MeV ^-1，是LaBr ₃：Ce晶体的80％。在¹³⁷ Cs 662 keV下，CLLB：Ce单晶的能量分辨率为4.0％。

更新日期：2019-08-25

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