γ-CuI晶体的发光衰减时间和对X射线的能量响应

doi:10.15541/jim20160262

无机材料学报 ›› 2017, Vol. 32 ›› Issue (2): 163-168.DOI: 10.15541/jim20160262

γ-CuI晶体的发光衰减时间和对X射线的能量响应

李锋锐¹, 顾牡¹, 何徽², 畅里华², 温伟峰², 李泽仁², 陈亮³, 刘金良³, 欧阳晓平³, 刘小林¹, 刘波¹, 黄世明¹, 倪晨¹

(1. 同济大学物理科学与工程学院, 上海市特殊人工微结构材料与技术重点实验室, 上海200092; 2. 中国工程物理研究院流体物理研究所, 绵阳621900; 3. 西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室, 西安710024)

收稿日期:2016-04-18 修回日期:2016-06-20 出版日期:2017-02-20 网络出版日期:2017-01-13
作者简介:李锋锐(1985–), 男, 博士研究生. E-mail: lifengrui@outlook.com
基金资助:
国家重大科学仪器设备开发专项项目(2011YQ13001902);国家自然科学基金(11475128, 91022002, 11375129);Significant National Special Project of the Ministry of Science and Technology of China for Development of Scientific Instrument and Equipment (2011YQ13001902);National Natural Science Foundation of China (11475128, 91022002, 11375129)

Fluorescent Decay Time and Energy Response of γ-CuI Crystal

LI Feng-Rui¹, GU Mu¹, HE Hui², CHANG Li-Hua², WEN Wei-Feng², LI Ze-Ren², CHEN Liang³, LIU Jin-Liang³, OUYANG Xiao-Ping³, LIU Xiao-Lin¹, LIU Bo¹, HUANG Shi-Ming¹, NI Chen¹

(1. Shanghai Key Laboratory of Special Artificial Microstructure Material & Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China; 2. Institute?of?Fluid?Physics, China Academy of Engineering Physics, Mianyang 621900, China; 3.State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, and Radiation Detection Research Center, Northwest Institute of Nuclear Technology, Xi’an 710024, China)

Received:2016-04-18 Revised:2016-06-20 Published:2017-02-20 Online:2017-01-13
About author:LI Feng-Rui. E-mail: lifengrui@outlook.com

摘要/Abstract

摘要：

采用溶剂蒸发法生长出透明的带隙宽度为2.96 eV的γ-CuI晶体。在紫外光激发下, 该晶体在410、430 nm处分别呈现有近带边发射峰, 另在720 nm附近还出现一个与样品碘缺陷有关的宽发射带。经碘退火后, 样品720 nm发射带被基本抑制, 而在420 nm处出现了一个更强的近带边发射峰。使用扫描相机分别测量了γ-CuI晶体各发射峰(带)的衰减时间谱, 其中近带边发射峰的发光衰减时间常数均在数十皮秒量级, 表明γ-CuI晶体具有极快的时间响应特性; 而720 nm发射带的发光衰减时间常数主要在数十纳秒量级。X射线激发下, γ-CuI晶体具有435 nm近带边发射峰和680 nm发射带, 其近带边发射对X射线能量响应的测量结果表明, 当E_X<49.1 keV时, γ-CuI晶体闪烁光快分量对X射线的探测效率相对较高。

关键词: γ, -CuI晶体, 超快闪烁体, 衰减时间, 能量响应

Abstract:

γ-CuI crystal was prepared by using slow solvent evaporation method. The optical transmission spectrum reveals that the crystal is transparent with band gap of 2.96 eV. Two near-band-edge emission peaks are located at 410 nm, 430 nm, and an iodine related defect emission band near 720 nm of the crystal appear under UV excitation. The emission band near 720 nm can be suppressed by iodine annealing, while a new and relative strong near-band-edge emission peaked at 420 nm appears. Decay times of emission peaks and band of γ-CuI crystals were measured by using streak camera. The results show that the decay times of all near-band-edge emission peaks are tens of picosecond, which indicates that γ-CuI crystal is one of the fastest scintillators, but the decay time of the emission band near 720 nm is mainly tens of nanosecond. γ-CuI crystal presents a near-band-edge emission peaked at 435 nm and a broad emission band near 680 nm under X-ray excitation. The energy response of the near- band-edge emission to X-ray shows that the emission has a relatively high response to X-ray when the X-ray energy is less than 49.1 keV.

Key words: γ, -CuI crystal, ultrafast scintillator, decay time, energy response to X-ray

中图分类号:

O734

李锋锐, 顾牡, 何徽, 畅里华, 温伟峰, 李泽仁, 陈亮, 刘金良, 欧阳晓平, 刘小林, 刘波, 黄世明, 倪晨. γ-CuI晶体的发光衰减时间和对X射线的能量响应[J]. 无机材料学报, 2017, 32(2): 163-168.

LI Feng-Rui, GU Mu, HE Hui, CHANG Li-Hua, WEN Wei-Feng, LI Ze-Ren, CHEN Liang, LIU Jin-Liang, OUYANG Xiao-Ping, LIU Xiao-Lin, LIU Bo, HUANG Shi-Ming,NI Chen. Fluorescent Decay Time and Energy Response of γ-CuI Crystal[J]. Journal of Inorganic Materials, 2017, 32(2): 163-168.

图/表 10

图1 发光衰减时间测试示意图

Fig. 1 Measurement schematic of decay time

图2 X射线能量响应测试装置示意图

Fig. 2 Measurement schematic of energy response to X-ray

表1 滤色片规格

Table 1 Type of filters

Emission	410 nm	420 nm	430 nm	720 nm	400-450 nm
Model	BP410-10K	BP420-10K	BP430-10K	BP740-280K	Non-standard part
Peak wavelength/nm	411	423	431	750	424
FWHM/nm	10	10	10	280	50
Transmittance/%	65	72	72	72	89

表2 不同靶材对应的X射线平均能量

Table 2 Average energy of X-ray emitted by different targets

Target	Fe	Cu	Ge	Zr	Ag	Sn	Nd	Dy	W	Au
E_X/keV	6.7	8.1	10.4	16.7	23.5	26.9	39.5	49.1	63.0	73.0

图3 CuI晶体的XRD图谱(a)和EDS谱(b)

Fig. 3 XRD (a) and EDS (b) patterns of CuI crystal

图4 γ-CuI晶体的透射光谱

Fig. 4 Transmission spectrum of γ-CuI crystal

图5 γ-CuI晶体的光致发射谱(a), 及其410 nm(b)、430 nm(c)和720 nm(d)发射峰(带)的扫描条纹图像和发光衰减时间谱

Fig. 5 Photoluminescence of γ-CuI crystal (a), and the streak camera images and temporal profiles of the emissions near 410 nm (b), 430 nm (c) and 720 nm (d), respectively

表3 γ-CuI晶体各发光峰(带)的衰减时间

Table 3 Decay time of the emission peaks (band) of γ-CuI crystal

Emission	410 nm		430 nm		720 nm
Decay time	τ=24.6 ps	I=100%	τ=46.7 ps	I=100%	τ₁=5.92 ns	I₁=34%
Decay time	τ=24.6 ps	I=100%	τ=46.7 ps	I=100%	τ₂=67.04 ns	I₂=66%

图6 碘退火γ-CuI晶体的光致发射谱(a)和420 nm发射峰的条纹图像和发光衰减时间谱(b)

Fig. 6 Photoluminescence of I2 annealed γ-CuI crystal (a) and streak camera image and temporal profile of the emission at 420 nm of γ-CuI crystal (b)

图7 γ-CuI晶体与PbWO4晶体的X射线激发发射谱(a)和γ-CuI晶体对X射线的能量响应(b)

Fig. 7 X-ray excited luminescence of γ-CuI and PbWO4 crys- tals (a) and energy response of γ-CuI crystal to X-ray (b)

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γ-CuI晶体的发光衰减时间和对X射线的能量响应

Fluorescent Decay Time and Energy Response of γ-CuI Crystal

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