Yang Zishen, Spencer Levi D, Zhang Huixin, Burmood Zachary L, Putta Anjaneyulu, Jiang Chaoyang
Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069, United States.
ACS Appl Mater Interfaces. 2024 Apr 3;16(13):16418-16426. doi: 10.1021/acsami.3c16016. Epub 2024 Mar 19.
Anticounterfeiting plays an essential role in authenticating genuine documents and combating forged products. To further advance the anticounterfeiting technology, there is a strong demand to design new functional materials with unique properties that will be appropriate for making multimode complex security labels. Recently, dynamic security labels have emerged as a new type of advanced anticounterfeiting method as they can hold a much higher security level than the traditional static ones. In this work, we report that calcium zinc germanate (CZGO) clinopyroxenes doped with lead ions have several interesting optical properties, such as dynamic fluorescence, long persistent luminescence, and photochromism. We find that the concentration of lead dopants can significantly impact the reaction kinetics as well as the crystallinity and luminescence properties of CZGO phosphors. By fully utilizing these unique properties, we have successfully fabricated several security labels with multilevel information encoding and dynamic optical performance. The combination of multimode and dynamic luminescence makes these labels extremely challenging to illegally duplicate. With further optimization, this lead-doped CZGO clinopyroxene can be well-integrated into modern anticounterfeiting techniques that will generate highly secure anticounterfeiting labels to combat fake products.
防伪在鉴定真实文件和打击伪造产品方面发挥着至关重要的作用。为了进一步推进防伪技术，迫切需要设计具有独特性能的新型功能材料，以制作多模式复杂安全标签。近年来，动态安全标签作为一种新型的先进防伪方法应运而生，因为它们比传统的静态安全标签具有更高的安全级别。在这项工作中，我们报道了掺杂铅离子的锗酸钙锌（CZGO）单斜辉石具有几种有趣的光学特性，如动态荧光、长余辉发光和光致变色。我们发现铅掺杂剂的浓度会显著影响反应动力学以及CZGO荧光粉的结晶度和发光性能。通过充分利用这些独特性能，我们成功制备了几种具有多级信息编码和动态光学性能的安全标签。多模式和动态发光的结合使得这些标签极难被非法复制。通过进一步优化，这种掺杂铅的CZGO单斜辉石可以很好地融入现代防伪技术中，从而生产出高度安全的防伪标签来打击假冒产品。
