Cs4 EuI6∶Sm近红外闪烁晶体的生长及发光性能研究
Growth and Luminescence Properties of Cs4EuI6∶Sm Near-Infrared Scintillation Crystals
杨江浩 1黄欣帅 1蓝陈慧 1魏钦华 1秦来顺1
作者信息
- 1. 中国计量大学材料与化学学院,杭州 310018
- 折叠
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Sm2+掺杂的Eu2+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Cs4EuI6 ∶ 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,Sm2+成功掺入Cs4EuI6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(Eu2+和Sm2+),发光峰位于450和840 nm左右,分别对应于Eu2+和Sm2+的5d→4f的跃迁发光,紫外激发下的Eu2+和Sm2+的荧光衰减寿命均处于微秒级别.结果 表明,随着Sm2+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Sm2+浓度掺杂对晶体发光性能、Eu2+-Sm2+能量传递及荧光寿命的影响,实验结果表明,改变Sm2+掺杂浓度可以调控晶体的发光性能.
Abstract
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 Sm2+doped europium-based halide crystals exhibit excellent near-infrared luminescence properties.In this paper,Cs4 EuI6∶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 Sm2+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(Eu2+and Sm2+),and the emission peaks are located at 450 and 840 nm,respectively,corresponding to the 5d→4f luminescence of Eu2+and Sm2+.The decay time of Eu2+and Sm2+is at the level of microsecond under ultraviolet excitation.The results show that the emission wavelength gradually varies from blue to near infrared as Sm2+doping concentration increased.The effects of Sm2+concentration on the luminescence properties,Eu2+-Sm2+energy transfer and decay time of the crystals were also studied,which means that the luminescence properties can be tuned by adjusting the Sm2+doping concenstration.
关键词
Cs4EuI6/Sm2+掺杂/闪烁晶体/近红外发光/布里奇曼法/能量传递Key words
Cs4EuI6/Sm2+doping/scintillation crystal/near infrared luminescence/Bridgman method/energy transfer引用本文复制引用
基金项目
国家自然科学基金(12275262)
浙江省大学生科技创新活动计划(新苗人才计划)(2022R409A015)
浙江省自然科学基金公益项目(LGG22E020001)
出版年
2024
国家科技期刊平台
NSTL
万方数据