BaGa2Si2O8∶Eu^2+,Eu^3+,Pr^3+的发光性质及其防伪加密应用  

Luminescence Properties of BaGa2Si2O8∶Eu^2+,Eu^3+,Pr^3+for Anticounterfeiting and Encryption

作　　者：冯琳 项磊磊 张加驰[1] FENG Lin;XIANG Lei-lei;ZHANG Jia-chi(School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China)

机构地区：[1]兰州大学物理科学与技术学院,甘肃兰州730000

出　　处：《发光学报》2020年第5期510-518,共9页Chinese Journal of Luminescence

基　　金：甘肃省科技计划一般项目(18JR3RA270)资助。

摘　　要：采用高温固相法在单一基质中制备了具有多模态发光特性的系列荧光粉BaGa2Si2O8∶Eu2+,Eu3+,Pr3+,掺入适量的Pr3+可显著改善荧光粉的余辉发光性能。结果表明,该系列荧光粉在254 nm或365 nm的光激发下,具有不同颜色的光致发光和余辉发光,体现出多模发光特征;同时该系列荧光粉的余辉发光还具有不同的衰减时间。根据这些发光特性,选用合适的荧光粉制作了系列发光图案。相关典型应用示例表明,该发光图案的多模发光特征可应用于发光防伪应用,而基于其差异化的余辉衰减特性,还可以设计出可动态变化的余辉发光图案,从而增加发光防伪和加密的安全层级。BaGa2Si2O8∶Eu2+,Eu3+,Pr3+phosphors with multi-modes luminescence were prepared by solid-state method.Meanwhile,the afterglow luminescence properties of phosphors are significantly increased by adding a proper content of Pr3+.It demonstrates that the phosphors show photoluminescence and afterglow luminescence with different colors under 254 nm or 365 nm excitation,indicating the feature of multi-mode luminescence.Meanwhile,the afterglow luminescence of the phosphors also shows different decay time.According to these luminescent features,we choose the appropriate phosphors to make a series of luminescent patterns.The typical examples demonstrate that the multi-mode luminescent characteristic of the patterns can be used in anticounterfeiting.Moreover,based on its characteristic of different afterglow decay time,we can also design the dynamically changing luminescent patterns to increase the security level of anti-counterfeiting and encryption.

关 键 词：荧光粉 发光性质 防伪 加密 

分 类 号：O482.31[理学—固体物理] TP391.4[理学—物理]