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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
- 发光学报 2018年39卷第7期 页码：895-902
- 作者机构：
东北师范大学 物理学院,吉林 长春,130021
- 作者简介：
- 基金信息：国家自然科学基金（11674050，11374047，11604044）资助项目()
DOI：10.3788/fgxb20183907.0895
中图分类号： O482.31纸质出版日期：2018-7-5，
网络出版日期：2018-4-16，
收稿日期：2017-12-17，
修回日期：2018-1-19，
扫 描 看 全 文
闫宏, 宋婷, 张猛等. 高性能X射线影像存储12CaO·7Al<sub>2</sub>O<sub>3</sub>:Pr<sup>3+</sup>荧光粉的微结构及光学特性[J]. 发光学报, 2018,39(7): 895-902
YAN Hong, SONG Ting, ZHANG Meng etc. Microstructure and Optical Properties of 12CaO·7Al<sub>2</sub>O<sub>3</sub>:Pr<sup>3+</sup> Phosphors for High Quality X-ray Imaging[J]. Chinese Journal of Luminescence, 2018,39(7): 895-902
闫宏, 宋婷, 张猛等. 高性能X射线影像存储12CaO·7Al<sub>2</sub>O<sub>3</sub>:Pr<sup>3+</sup>荧光粉的微结构及光学特性[J]. 发光学报, 2018,39(7): 895-902 DOI： 10.3788/fgxb20183907.0895.
YAN Hong, SONG Ting, ZHANG Meng etc. Microstructure and Optical Properties of 12CaO·7Al<sub>2</sub>O<sub>3</sub>:Pr<sup>3+</sup> Phosphors for High Quality X-ray Imaging[J]. Chinese Journal of Luminescence, 2018,39(7): 895-902 DOI： 10.3788/fgxb20183907.0895.
摘要
采用自蔓延燃烧法制备了不同镨掺杂浓度的12CaO7Al
2
O
3
：Pr
3+
（C12A7：Pr
3+
） X射线影像存储荧光粉。在232 nm激发下，发现Pr
3+
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% Pr
3+
样品进行真空热处理后，C12A7笼中的O
2-
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% Pr
3+
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% Pr
3+
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 12CaO7Al
2
O
3
:Pr
3+
(C12A7:Pr
3+
) with different doping concentrations were synthesized by a combustion method. For C12A7:0.3%Pr
3+
phosphor
the strongest intensity of the emission peak at 486 nm
originating from
3
P
0
-
3
H
4
transition of Pr
3+
can be obtained upon 232 nm excititation. After the annealing in vacuum
the number of encaged O
2-
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:Pr
3+
phosphors have potential application in the field of computed radiography.
关键词
光致发光荧光粉稀土离子热释发光
Keywords
photoluminescencephosphorrare earth ionthermoluminescence
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