Jiang Xiaoping, Guo Yue, Wang Lixi, Zhang Qitu
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China; Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 211816, China.
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China; Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 211816, China.
J Colloid Interface Sci. 2025 Jan 15;678(Pt A):872-885. doi: 10.1016/j.jcis.2024.08.169. Epub 2024 Aug 26.
Multi-mode dynamic anti-counterfeiting materials can provide complex anti-counterfeiting performance and ensure the anti-counterfeiting strategy becomes more secure. Herein, a new type of multi-mode anti-counterfeiting encryption material of CaAlO:Eu, Er with different Er doping concentration was developed by sol-gel method. Interestingly, the CaAlO:Eu, Er phosphor and its composite have multi-mode anti-counterfeiting characteristics of multi-color down-conversion luminescence, up-conversion luminescence, dynamic luminescence, and photochromism. Effect of different Er doping concentration on the down-conversion luminescence, up-conversion luminescence, dynamic luminescence, and photochromism of CaAlO:Eu, Er was systematically investigated, and the relevant mechanisms were discussed. These anti-counterfeiting features can be simultaneously applied in both bright and dark fields, which can achieve high-level anti-counterfeiting in both spatial and temporal dimensions. The CaAlO:Eu, Er phosphors cannot be easily replaced by other materials with the same anti-counterfeiting properties. They display good application foreground in the field of anti-counterfeiting encryption.
多模式动态防伪材料可以提供复杂的防伪性能，并确保防伪策略更加安全。在此，通过溶胶-凝胶法制备了一种新型的不同Er掺杂浓度的CaAlO:Eu, Er多模式防伪加密材料。有趣的是，CaAlO:Eu, Er荧光粉及其复合材料具有多色下转换发光、上转换发光、动态发光和光致变色等多模式防伪特性。系统研究了不同Er掺杂浓度对CaAlO:Eu, Er的下转换发光、上转换发光、动态发光和光致变色的影响，并讨论了相关机制。这些防伪特征可以同时应用于明场和暗场，在空间和时间维度上都能实现高级防伪。CaAlO:Eu, Er荧光粉不容易被具有相同防伪性能的其他材料替代。它们在防伪加密领域显示出良好的应用前景。
