摘要
目的制备一种新型SrAl_2O_4:Eu^(2+),Dy^(3+)长余辉指纹显现试剂,开发一种有效防止背景干扰的指纹显现提取新技术。方法采用高温固相法合成了SrAl_2O_4:Eu^(2+),Dy^(3+)无机盐材料,破碎筛分获得了无机长余辉指纹显现粉末试剂。研究了该试剂的光学性能及粒度对指纹显现效果的影响,并使用该试剂对纸币、铝箔、灯泡及覆膜包装纸等具有反光、多色、荧光特性的承痕客体上的新鲜潜指纹进行了显现。结果所制备的指纹显现试剂的激发峰为336 nm,发射峰为520 nm。SEM观测发现指纹物质对粒径为20μm的SrAl_2O_4:Eu^(2+),Dy^(3+)粉末颗粒具有选择性吸附。粉末所显指纹在黑暗环境中呈现为无背景图案、细节特征清晰的明亮黄绿色指纹图像。结论SrAl_2O_4:Eu^(2+),Dy^(3+)粉末对反光、多色、荧光承痕客体上的新鲜潜指纹有良好的显现效果,能有效克服承痕客体背景干扰,有望成为一种新型长余辉自发光指纹显现粉末试剂。
Objective A new kind of material of long afterglow phosphorescent SrAl2O4:Eu2+,Dy3+powder is to developfor visualizing latent fingerprint under the substantial elimination of background interference.Methods The SrAl2O4:Eu2+,Dy3+powder was synthesized via the solid state reaction at high temperature.The luminescent property and particle size of thepowder were characterized by fluorescence spectrometer and SEM.Furthermore,the fresh fingerprints,deposited on thelight-reflecting,polychromatic and fluorescent substances(e.g.,paper money,aluminum foil,lamp bulb and plastic film),were developed by the phosphorescent powder.Results The fingerprint-carrying substance has characteristically adsorbedthe SrAl2O4:Eu2+,Dy3+powders(particle size20μm)which show their excitation and emission peaks at336nm and524nm,respectively.The bright yellow-green fingerprint images were clearly revealed under dark background.Conclusions By selfluminescenceof SrAl2O4:Eu2+,Dy3+,the background disturbance of substrates was effectively diminished,therefore acquiringhigh-contrast images.SrAl2O4:Eu2+,Dy3+powder is very likely to be a new agent for latent fingerprint development.
作者
高峰
赵越
王子政
薛静
刘寰
张绍雨
GAO Feng;ZHAO Yue;WANG Zizheng;XUE Jing;LIU Huan;ZHANG Shaoyu(China Maritime Police Academy, Ningbo 315801, Zhejiang, China;Institute of Forensic Science, Ministry of Public Security, Beijing 100038, China;Xinjiang Police College, Urumqi 830011, Xinjiang, China;Xicheng Branch of Beijing Public Security Bureau, Beijing 100032, China;Jiangsu Police Institute, Nanjing 210031, China)
出处
《刑事技术》
2017年第5期345-349,共5页
Forensic Science and Technology
基金
中央级公益性科研院所基本科研业务费专项资金项目(No.2015JB011)
公安部应用创新计划项目(No.2013YYCYHJXY124
No.2014YY CXGAES049)
