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人工晶体学报 ›› 2025, Vol. 54 ›› Issue (7): 1221-1228.DOI: 10.16553/j.cnki.issn1000-985x.2025.0039

• 研究论文 • 上一篇    下一篇

0维钙钛矿Cs3CdBr5的晶体生长与闪烁性能研究

贾宇桢(), 李政隆, 颜欣龙, 王瑞辰, 彭晨, 段韦恒, 杨伟虎, 何伟民, 宋柏君, 程瑶, 范潇宇, 杨帆()   

  1. 南开大学物理科学学院,天津 300110
  • 收稿日期:2025-02-28 出版日期:2025-07-20 发布日期:2025-07-30
  • 通信作者: 杨帆,博士,副教授。E-mail:fan@nankai.edu.cn
  • 作者简介:贾宇桢(1999—),男,河北省人,博士研究生。E-mail:1120240110@mail.nankai.edu.cn
    杨 帆,南开大学物理科学学院副教授,博士生导师。《人工晶体学报》青年编委。长期从事闪烁体与辐射探测领域相关研究。主持国家重点研发计划项目、国家自然科学基金项目多项;参与多项美国能源部项目、中国“863”计划及国家自然科学基金项目。
  • 基金资助:
    国家重点研发计划(2022YFB3503900);国家自然科学基金(12175110)

Investigation of Crystal Growth and Scintillation Properties of 0-Dimensional Perovskite Cs3CdBr5

JIA Yuzhen(), LI Zhenglong, YAN Xinlong, WANG Ruichen, PENG Chen, DUAN Weiheng, YANG Weihu, HE Weimin, SONG Baijun, CHENG Yao, FAN Xiaoyu, YANG Fan()   

  1. School of Physical,Nankai University,Tianjin 300110,China
  • Received:2025-02-28 Online:2025-07-20 Published:2025-07-30

摘要: 本文使用坩埚下降法制备了?5 mm的Cs3CdBr5单晶,在晶锭锥部发现了CsBr包裹Cs3CdBr5形成的Cs3CdBr5-CsBr复合闪烁体。对晶体进行了物相分析,解释了复合闪烁体形成的原因,并对晶体进行了光致发光与X射线激发发光性能研究。Cs3CdBr5晶体属于四方晶系,空间群为I4/mcm,为0维钙钛矿结构。在荧光和X射线激发下,Cs3CdBr5单晶分别表现出374和365 nm弱发光,荧光激发发光衰减时间为0.4和16.6 ns,X射线激发发光衰减时间为15.9 ns,为Cs3CdBr5本征发光,存在自吸收。相同激发下,Cs3CdBr5-CsBr复合闪烁体均表现出相对更强的365 nm发光,荧光激发发光寿命为0.97和14.79 ns,X射线激发发光衰减时间为17 ns,并且在X射线激发下,还出现了发光峰值波长在438 nm的CsBr发光,贡献了亚毫秒级慢分量。Cs3CdBr5-CsBr复合闪烁体在241Am源激发下,具有56.9%的能量分辨率和257 photons/MeV的光产额。良好的环境稳定性与特殊的0维钙钛矿结构使以Cs3CdBr5为基底的掺杂晶体有望成为具有实际应用价值的闪烁晶体。

关键词: Cs3CdBr5; Cs3CdBr5-CsBr复合闪烁体; 0维钙钛矿; 坩埚下降法; 自陷激子发光; 闪烁晶体

Abstract: The ?5 mm Cs3CdBr5 single crystals were grown using the Bridgman method, and Cs3CdBr5-CsBr composite scintillator were formed by CsBr encapsulating Cs3CdBr5 in the cone of the ingot. We conducted phase analysis on the crystal which explained the formation of composite scintillators, and investigated the photoluminescence and X-ray excited luminescence properties. The Cs3CdBr5 crystal belongs to the tetragonal crystal system with a space group of I4/mcm. It is of a 0-dimensional perovskite structure. The emission peaks of Cs3CdBr5 single crystal excited by fluorescence and X-ray are at 374 and 365 nm, respectively. The decay time of photoluminescence is 0.4 and 16.6 ns, while the decay time of X-ray excited luminescence is 15.9 ns, which is the intrinsic luminescence of Cs3CdBr5 with self-absorption. Under the same excitation, Cs3CdBr5-CsBr composite scintillators exhibit relatively stronger luminescence peaking at 365 nm, with photoluminescence decay time of 0.97 and 14.79 ns, X-ray excited luminescence decay time of 17 ns. There is luminescence of CsBr peaking at 438 nm under X-ray excitation, which contributes to sub-millisecond slow fraction. The Cs3CdBr5-CsBr composite scintillator exhibits an energy resolution of 56.9% and a light yield of 257 photons/MeV when excited by 241Am source. The good environmental stability and special 0-dimensional perovskite structure make doped crystals based on Cs3CdBr5 promising scintillation crystals with practical application value.

Key words: Cs3CdBr5; Cs3CdBr5-CsBr composite scintillator; 0-dimensional perovskite; Bridgman method; self trapped exciton luminescence; scintillation crystal

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