闪烁体
闪烁
吸收(声学)
量子产额
荧光
量子点
发光
放射化学
光子
材料科学
伽马射线
产量(工程)
物理
分析化学(期刊)
光电子学
化学
核物理学
光学
探测器
色谱法
冶金
复合材料
作者
Yuxin Hao,Tianheng Chen,Ziqing Han,Jiacheng Fan,Qibing Pei
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2022-09-29
卷期号:5 (10): 14572-14581
被引量:1
标识
DOI:10.1021/acsanm.2c02930
摘要
Cesium lead bromide quantum dot (CsPbBr3 QD) is emerging as a promising luminescent material for gamma ray detection. However, its intensive self-absorption traps the luminescent photons generated and diminishes the scintillation light yield. The self-absorption is magnified at high CsPbBr3 QD loading and large scintillator volume, which are required to effectively attenuate gamma photons. We report a liquid scintillator loaded with up to 40 wt % of CsPbBr3 QDs. Pyrromethene 580 (PM-580), a fluorescent dye, was co-dissolved in the solution as a fluorescence resonance energy-transfer acceptor to overcome the self-absorption of the QDs. The rapid energy transfer from the QDs to PM-580 also accelerates the scintillation decay kinetics. The scintillation light yield of the liquid containing 20 wt % QDs and 0.75 wt % PM-580 was 8800 photons/MeV. The decay lifetime is 24.3 ns, faster than most inorganic crystal scintillators. The light yield was 7300 photons/MeV at 40 wt % QD loading. Gamma pulse spectroscopy of the 40 wt % QD liquid produced the 662 keV gamma photopeak with a 27% energy resolution, demonstrating the potential of the CsPbBr3 QD loaded organic scintillators for spectroscopic gamma detection.
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