K_2LaCl_5:Ce晶体的生长及闪烁性能研究

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英文篇名：Growth and Scintillation Properties of K_2LaCl_5:Ce Crystal 作者：章政 ; 张建裕 ; 杜飞 ; 李倩倩 ; 潘尚可 ; 潘建国 英文作者：ZHANG Zheng;ZHANG Jian-yu;DU Fei;LI Qian-qian;PAN Shang-ke;PAN Jian-guo;Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province,School of Materials Science and Chemical Engineering,Ningbo University; 关键词：K2LaCl5 ; Ce ; 坩埚下降法 ; 能级跃迁 ; 闪烁性能 英文关键词：K2LaCl5:Ce;;Bridgman technique;;energy level transition;;scintillation property 中文刊名：RGJT 英文刊名：Journal of Synthetic Crystals 机构：宁波大学材料科学与化学工程学院浙江省光电探测材料及器件重点实验室; 出版日期：2019-03-15 出版单位：人工晶体学报 年：2019 期：v.48;No.245 基金：国家自然科学基金(61775108,61875096) 语种：中文; 页：RGJT201903001 页数：5 CN：03 ISSN：11-2637/O7 分类号：6-10

摘要

利用坩埚下降法生长出复合稀土卤化物K_2LaCl_5:Ce单晶,该晶体为正交结构,晶胞参数为a=1.2745 nm,b=0.8868 nm,c=0.8018 nm,熔点为625℃。通过切割研磨抛光后得到?12 mm×5 mm的透明圆柱体晶体。将该晶体进行X射线激发发射光谱、光致发光光谱、脉冲高度谱、γ射线衰减能谱、透过率等测试。在一定波段的紫外光以及X射线的激发下,K_2LaCl_5:Ce晶体在355 nm与375 nm波长左右有宽的发射峰,分别对应于Ce3+的5d1→2F5/2和5d1→2F7/2能级跃迁。在紫外和γ射线的激发下,K_2LaCl_5:Ce晶体的衰减时间分别为33 ns和23 ns,晶体的能量分辨率为5.9%。
        The complex rare earth halide K_2LaCl_5:Ce single crystal was successfully grown by Bridgman technique. The K_2LaCl_5:Ce crystal belongs to orthorhombic system and the cell parameters has been determined as: a = 1. 2598 nm,b = 0. 8642 nm,c = 0. 7922 nm,the melting point is 625 ℃. The transparent cylinder crystal bolt which the size is ?12 mm × 5 mm were obtained by incising,grinding and polishing process. Then the crystal was measured by X-ray excitation emission spectrum,photoluminescence spectrum,pulse height spectrum,gamma-ray decay time and optical transmittance.Under the UV and X-ray excitation,the K_2LaCl_5:Ce single crystal exhibited the two broad emission peak located at 355 nm and 375 nm,corresponding to Ce3 +5 d1→2 F5/2 and 5 d1→2 F7/2 energy level transition.The scintillating decay time of the K_2LaCl_5:Ce crystal is about 23 ns under the γ-ray excitation,about 33 ns under ultraviolet excitation. The energy resolution of the crystal is 5. 9%.

引文

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