发光学报, 2018, 39 (10): 1331, 网络出版: 2018-11-25   

黄绿色镝掺杂七铝酸十二钙X射线荧光粉的表征及其X射线存储特性

Characterization and Storage Property of Dy3+ Doped C12A7 X-ray Phosphors with Yellowish-green Emission
作者单位
东北师范大学 物理学院, 吉林 长春 130024
摘要
采用自蔓延燃烧法结合高温热处理方法制备了镝离子掺杂浓度不同的七铝酸十二钙(12CaO·7Al2O3∶x%Dy3+, C12A7∶x%Dy3+)X射线荧光粉材料。实验发现, 该系列荧光粉在350 nm激发下, 可观察到位于486 nm和575 nm的两个发光峰, 其分别来源于Dy3+离子的4F9/2→6H15/2和4F9/2→6H13/2跃迁。当镝掺杂摩尔分数为0.3%时, 两个发光峰的发射强度最大。在氮气气氛下, 1 300 ℃热处理C12A7∶x%Dy3+荧光粉后, 与未热处理样品相比, 笼中OH-基团减少, 导致其光激励发光强度显著增大, 并产生了更多的深陷阱。通过使用氮气气氛热处理后的C12A7∶0.3%Dy3+粉末制成的成像板, 以包覆有绝缘层细电线为成像目标, 发现在合适的X射线吸收剂量下(0.54 Gy), 可以实现高质量的X射线成像。以上实验结果表明, 镝掺杂的七铝酸十二钙X射线荧光粉材料在数字化静态X射线图像目标检测技术中有潜在的应用前景。
Abstract
Dy3+ doped C12A7 (C12A7∶x%Dy3+) X-ray phosphors with different doping concentrations were prepared by a self-propagating combustion method in combination with a heat-treatment at high temperature. For these phosphors upon 350 nm excitation, two obvious emission peaks at 486 and 575 nm, originate from the4F9/2→6H15/2 and4F9/2→6H13/2 transitions of Dy3+. As the mole fraction of Dy3+ is 0.3%, the strongest intensities of the two emission peaks can be reached. For the C12A7∶0.3%Dy3+ phosphor heattreated at 1 300 ℃ in N2 ambient for 2 h, the photostimulable luminescence intensity is enhanced and more deep traps are generated due to the decreasing encaged OH- anions compared to the unheattreated sample. It can be found that, under a moderate amount of X-ray absorbed dose(0.54 Gy), high quality X-ray imaging can be realized by using an imaging object, which is two thin wires capped with insulating layer, and using an imaging plate, which is a round tablet fabricated by pressed the heattreated C12A7∶0.3%Dy3+ powders. Our results suggest that Dy3+ doped C12A7 X-ray phosphors have a potential application for the techniques related to digital static X-ray imaging.

侯爽, 刘春光, 杨健, 李胜男, 张猛, 祝汉成, 严端廷, 徐长山, 刘玉学. 黄绿色镝掺杂七铝酸十二钙X射线荧光粉的表征及其X射线存储特性[J]. 发光学报, 2018, 39(10): 1331. HOU Shuang, LIU Chun-guang, YANG Jian, LI Sheng-nan, ZHANG Meng, ZHU Han-cheng, YAN Duan-ting, XU Chang-shan, LIU Yu-xue. Characterization and Storage Property of Dy3+ Doped C12A7 X-ray Phosphors with Yellowish-green Emission[J]. Chinese Journal of Luminescence, 2018, 39(10): 1331.

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