Cs_(4)EuI_(6)∶Sm近红外闪烁晶体的生长及发光性能研究  

Growth and Luminescence Properties of Cs_(4)EuI_(6)∶Sm Near-Infrared Scintillation Crystals

作　　者：杨江浩 黄欣帅 蓝陈慧 魏钦华[1] 秦来顺[1] YANG Jianghao;HUANG Xinshuai;LAN Chenhui;WEI Qinhua;QIN Laishun(College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国计量大学材料与化学学院,杭州310018

出　　处：《人工晶体学报》2024年第4期627-633,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(12275262);浙江省大学生科技创新活动计划(2022R409A015);浙江省自然科学基金公益项目(LGG22E020001)。

摘　　要：随着长波敏感硅基光电探测器的发展,近红外闪烁晶体逐渐成为研究热点,其中Sm^(2+)掺杂的Eu^(2+)基卤化物晶体表现出优异的近红外发光性能。本文利用布里奇曼法成功制备了尺寸达到厘米级别的Cs_(4)EuI_(6)∶Sm近红外闪烁晶体,通过XRD、XPS和ICP-OES等手段研究了晶体的组分和结构。结果表明,Sm^(2+)成功掺入Cs_(4)EuI_(6)基质,且对基质的晶体结构无明显影响。在紫外和X射线的激发下,晶体主要呈现两个发光中心(Eu^(2+)和Sm^(2+)),发光峰位于450和840 nm左右,分别对应于Eu^(2+)和Sm^(2+)的5d→4f的跃迁发光,紫外激发下的Eu^(2+)和Sm^(2+)的荧光衰减寿命均处于微秒级别。结果表明,随着Sm^(2+)掺杂浓度的增加,发光波长由蓝光逐渐变为近红外光。同时系统研究了不同Sm^(2+)浓度掺杂对晶体发光性能、Eu^(2+)-Sm^(2+)能量传递及荧光寿命的影响,实验结果表明,改变Sm^(2+)掺杂浓度可以调控晶体的发光性能。With the rapid development of silicon-based light detectors with high detection efficiency and long-wavelength sensitivity,the development of near-infrared scintillation crystals has become a hotspot.Especially,the Sm^(2+)doped europium-based halide crystals exhibit excellent near-infrared luminescence properties.In this paper,Cs_(4)EuI_(6)∶Sm near-infrared scintillation crystals with a size of cm-level were successfully prepared by Bridgman method.The composition and structure were discussed by XRD,XPS and ICP-OES methods,indicating that the Sm^(2+)was introduced and has no obvious effect on the crystal structure of the matrix.Under ultraviolet and X-ray excitation,the crystal has two luminescence centers(Eu^(2+)and Sm^(2+)),and the emission peaks are located at 450 and 840 nm,respectively,corresponding to the 5d→4f luminescence of Eu^(2+)and Sm^(2+).The decay time of Eu^(2+)and Sm^(2+)is at the level of microsecond under ultraviolet excitation.The results show that the emission wavelength gradually varies from blue to near infrared as Sm^(2+)doping concentration increased.The effects of Sm^(2+)concentration on the luminescence properties,Eu^(2+)-Sm^(2+)energy transfer and decay time of the crystals were also studied,which means that the luminescence properties can be tuned by adjusting the Sm^(2+)doping concenstration.

关 键 词：Cs_(4)EuI_(6) Sm^(2+)掺杂 闪烁晶体 近红外发光 布里奇曼法 能量传递 

分 类 号：O782[理学—晶体学]