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 Dy^(3+) Doped C12A7 X-ray Phosphors with Yellowish-green Emission

作　　者：侯爽 刘春光[1] 杨健[1] 李胜男[1] 张猛[1] 祝汉成[1] 严端廷[1] 徐长山[1] 刘玉学[1] HOU Shuang;LIU Chun-guang;YANG Jian;LI Sheng-nan;ZHANG Meng;ZHU Han-cheng;YAN Duan-ting;XU Chang-shan;LIU Yu-xue(School of Physics,Northeast Normal University,Changchun 130024,China)

机构地区：[1]东北师范大学物理学院,吉林长春130024

出　　处：《发光学报》2018年第10期1331-1338,共8页Chinese Journal of Luminescence

基　　金：国家自然科学基金(11674050;11374047;11604044)资助项目~~

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·7Al_2O_3∶x%Dy^(3+),C12A7∶x%Dy^(3+))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486nm和575 nm的两个发光峰,其分别来源于Dy^(3+)离子的~4F_(9/2)→~6H_(15/2)和~4F_(9/2)→~6H_(13/2)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%Dy^(3+)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%Dy^(3+)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。Dy 3+doped C12A7(C12A7∶x%Dy 3+)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 the 4F 9/2→6H 15/2 and 4F 9/2→6H 13/2 transitions of Dy 3+.As the mole fraction of Dy 3+is 0.3%,the strongest intensities of the two emission peaks can be reached.For the C12A7∶0.3%Dy 3+phosphor heattreated at 1 300℃in N 2 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%Dy 3+powders.Our results suggest that Dy 3+doped C12A7 X-ray phosphors have a potential application for the techniques related to digital static X-ray imaging.

关 键 词：光致发光 荧光粉 稀土离子 光激励发光 

分 类 号：O482.31[理学—固体物理]