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Imaging sweat pore structures in latent fingerprints and unclonable anti-counterfeiting patterns by sensitizers blended LaOF:Pr3+ nanophosphors
Optical Materials ( IF 3.9 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.optmat.2019.109625
C. Suresh , G.P. Darshan , S.C. Sharma , M. Venkataravanappa , H.B. Premkumar , S. Shanthi , K.N. Venkatachalaiah , H. Nagabhushana

Abstract Ultra-bright luminescent nanomaterials can be controlled by blended with suitable dopant ions offers a significant strategy to combat the counterfeiters and the reveal latent fingerprints. Herein, we report Pr3+ activated LaOF nanophosphors blended with monovalent alkali metal ions (Na+, K+, Li+) prepared via eco-friendly sonochemical route. The X-ray diffraction profiles confirm the tetragonal crystal system. The photoluminescence emission showed characteristic peaks at ~497, 531, 555, 612, 641, 685, 702 and 734 nm, which corresponds to 3P0→3H4, 3P1→3H5, 3P0→3H5, 3P0→3H6, 3P0→3F2, 3P1→3F3, 3P1→3F4 and 3P0→3F4 transitions Pr3+ ions, respectively. A significant luminescent enhancement was achieved in Li+ co-dopant when compared to Na+ and K+. Upon co-doping, color coordinates shifted from orange to pure red region. The latent fingerprint results on various surfaces clearly showed the high resolution images of active or inactive sweat pores with superior sensitivity and selectivity and low background hindrance. A greater possible stochastic process to make unclonable anti-counterfeiting patterns using optimized nanophosphor was designed to reduce counterfeit products. Therefore, we believe that this optimized nanophosphor for visualization of latent fingerprints as well as unclonable anti-counterfeiting tags find widespread use in advanced forensic investigations and product safety applications.

中文翻译:

通过混合 LaOF:Pr3+ 纳米磷光体的敏化剂对潜在指纹中的汗孔结构和不可克隆的防伪图案进行成像

摘要 通过与合适的掺杂离子混合可以控制超亮发光纳米材料,为打击造假者和揭示潜在指纹提供了重要策略。在此,我们报告了通过环境友好的声化学途径制备的与一价碱金属离子(Na+、K+、Li+)混合的 Pr3+ 活化的 LaOF 纳米磷光体。X 射线衍射图证实了四方晶系。光致发光在~497、531、555、612、641、685、702和734 nm处出现特征峰,对应于3P0→3H4、3P1→3H5、3P0→3H5、3P0→3H6、3P03→3F 3F3、3P1→3F4 和 3P0→3F4 分别跃迁 Pr3+ 离子。与 Na+ 和 K+ 相比,Li+ 共掺杂剂实现了显着的发光增强。共掺杂后,颜色坐标从橙色变为纯红色区域。各种表面的潜指纹结果清楚地显示了活性或非活性汗孔的高分辨率图像,具有优越的灵敏度和选择性以及低背景阻碍。使用优化的纳米荧光粉制造不可克隆的防伪图案的更大可能的随机过程旨在减少假冒产品。因此,我们相信这种用于潜在指纹可视化以及不可克隆的防伪标签的优化纳米磷光体在高级法医调查和产品安全应用中得到了广泛的应用。使用优化的纳米荧光粉制造不可克隆的防伪图案的更大可能的随机过程旨在减少假冒产品。因此,我们相信这种用于潜在指纹可视化以及不可克隆的防伪标签的优化纳米磷光体在高级法医调查和产品安全应用中得到了广泛的应用。使用优化的纳米荧光粉制造不可克隆的防伪图案的更大可能的随机过程旨在减少假冒产品。因此,我们相信这种用于潜在指纹可视化以及不可克隆的防伪标签的优化纳米磷光体在高级法医调查和产品安全应用中得到了广泛的应用。
更新日期:2020-02-01
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