发光学报, 2018, 39 (7): 895, 网络出版: 2018-08-30   

高性能X射线影像存储12CaO·7Al2O3∶Pr3+荧光粉的微结构及光学特性

Microstructure and Optical Properties of 12CaO·7Al2O3∶Pr3+ Phosphors for High Quality X-ray Imaging
作者单位
东北师范大学 物理学院, 吉林 长春 130024
摘要
采用自蔓延燃烧法制备了不同镨掺杂浓度的12CaO·7Al2O3∶Pr3+(C12A7∶Pr3+)X射线影像存储荧光粉。在232 nm激发下, 发现Pr3+掺杂摩尔分数为0.3%的荧光粉位于486 nm的蓝光发射峰呈现最大的发光强度。对C12A7∶0.3%Pr3+样品进行真空热处理后, C12A7笼中的O2-基团数量减少, 同时类F+色心的空笼子的数量增多, 导致陷阱数目增加和光激励发光强度增大。热释发光实验表明: C12A7∶0.3%Pr3+样品中存在两个深陷阱, 陷阱深度分别约为0.69 eV和0.80 eV; 经过真空热处理后的C12A7∶0.3%Pr3+荧光粉, 陷阱深度变深, 陷阱数目增多, 光存储性能变好。当吸收的X射线剂量为5.2 Gy时, 可以实现分辨率较高的X射线成像。实验结果表明, 镨掺杂C12A7荧光粉在计算机X射线摄影领域有潜在的应用前景。
Abstract
X-ray storage phosphors 12CaO·7Al2O3∶Pr3+ (C12A7∶Pr3+) with different doping concentrations were synthesized by a combustion method. For C12A7∶0.3%Pr3+ phosphor, the strongest intensity of the emission peak at 486 nm, originating from 3P0-3H4 transition of Pr3+, can be obtained upon 232 nm excititation. After the annealing in vacuum, the number of encaged O2- anions decreased, while the amount of empty cages increased. Thus, it led to the increased number of traps and the enhanced photo-stimulable luminescence(PSL). The thermoluminescence(TL) analysis showed that there existed two deep traps in the phosphors and the trap depths were ~0.69 and ~0.80 eV, respectively. In particular, the annealing in vacuum led to the deeper trap depths, the increased number of traps and the improved storage properties. Upon X-ray irradiation(applied dose: 5.2 Gy), a blue image with high resolution was obtained by 808 nm stimulation. Our results suggested that the C12A7∶Pr3+ phosphors have potential application in the field of computed radiography.

闫宏, 宋婷, 张猛, 李胜男, 杨健, 刘春光, 祝汉成, 严端廷, 徐长山, 刘玉学. 高性能X射线影像存储12CaO·7Al2O3∶Pr3+荧光粉的微结构及光学特性[J]. 发光学报, 2018, 39(7): 895. YAN Hong, SONG Ting, ZHANG Meng, LI Sheng-nan, YANG Jian, LIU Chun-guang, ZHU Han-cheng, YAN Duan-ting, XU Chang-shan, LIU Yu-xue. Microstructure and Optical Properties of 12CaO·7Al2O3∶Pr3+ Phosphors for High Quality X-ray Imaging[J]. Chinese Journal of Luminescence, 2018, 39(7): 895.

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