CsI-LiCl共晶材料的坩埚下降法生长与闪烁性能研究  

Growth and Scintillation Characterization of CsI-LiCl Eutectic Material by Bridgman Method

作　　者：颜欣龙 石肇基 彭晨 王瑞 杨帆[1] YAN Xinlong;SHI Zhaoji;PENG Chen;WANG Rui;YANG Fan(School of Physical,Nankai University,Tianjin 300071,China)

机构地区：[1]南开大学物理科学学院,天津300071

出　　处：《人工晶体学报》2021年第3期410-415,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(11775120);天津市自然科学基金(18JCYBJC17800)。

摘　　要：本文采用坩埚下降法,在真空密封的石英坩埚中成功生长出CsI-LiCl与CsI-LiCl∶Na共晶闪烁体。通过扫描电子显微镜(SEM)观察晶体微结构表明该共晶中LiCl相与CsI相存在周期性的层状排列,CsI相的厚度在5μm左右。共晶样品的X射线激发发射谱显示在CsI-LiCl和CsI-LiCl∶Na共晶样品存在缺陷发光,在CsI-LiCl样品中还观察到了纯CsI的自陷激子(STE)发光。CsI-LiCl样品在α粒子激发下的多道能谱中观察到明显的全能峰,这一结果证明CsI-LiCl共晶可用于热中子探测的潜力。CsI-LiCl and CsI-LiCl∶Na eutectic scintillators were successfully grown in a vacuum-sealed quartz crucible by vertical Bridgman method.The periodic lamellar microstructure of the crystal was observed by SEM with the CsI phase of 5μm thickness.The X-ray excitation luminescence spectra show that the luminescence of CsI-LiCl and CsI-LiCl∶Na eutectic is mainly attributed to the oxygen induced defects luminescence.And the STE luminescence of pure CsI is observed in the CsI-LiCl eutectic.Full energy peak is observed in theαparticle excited multi-channel energy spectrum of CsI-LiCl eutectic,which indicates that the eutectic has potential thermal neutron detection ability.

关 键 词：闪烁体 CSI LICL 共晶 坩埚下降法 中子 探测 

分 类 号：O78[理学—晶体学]