State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, China.
Department of Chemistry, Fudan University, Shanghai, 200433, China.
Adv Mater. 2023 Apr;35(17):e2211117. doi: 10.1002/adma.202211117. Epub 2023 Mar 17.
Counterfeiting is a worldwide issue and has long troubled legitimate businesses, while nowadays anti-counterfeiting materials and technology are still insufficient to combat the escalating counterfeit behaviors. Inspired by hindwing structure of Troides magellanus, a new kind of anti-counterfeiting material taking advantage of both physical and chemical structures to display multiple optical states is prepared. The chemical units (luminescent lanthanide) are blended with physical units (monodispersed colloidal particles) and mediating molecules, which are then assembled into a photonic crystal structure at room temperature in less than 10 s through a new assembly technique called molecule-mediated shear-induced assembly technique (MSAT). The as-prepared photonic crystal films feature three unique optical states, each displaying structural, fluorescent, and phosphorescent color under different lighting conditions, which integrates colors from both physical and chemical origins. Furthermore, by incorporating different luminescent materials into different parts of the photonic crystal pattern, a high-level information encryption system is designed to be capable of carrying three distinct types of information. Thanks to this powerful tool of MSAT, it is now possible to assemble different-sized, even irregular non-spherical units with monodispersed spherical units into high-quality photonic crystal films, which provides easy access to incorporating new features into photonic crystal systems.
伪造是一个全球性的问题，长期以来一直困扰着合法企业，而如今，防伪材料和技术仍然不足以应对日益猖獗的伪造行为。受 Troides magellanus 后翅结构的启发，我们制备了一种新型防伪材料，该材料利用物理和化学结构来显示多种光学状态。化学单元（发光镧系元素）与物理单元（单分散胶体颗粒）和中介分子混合，然后通过一种称为分子介导剪切诱导组装技术（MSAT）的新技术，在不到 10 秒的时间内在室温下组装成光子晶体结构。所制备的光子晶体膜具有三种独特的光学状态，每种状态在不同的照明条件下都显示出结构、荧光和磷光颜色，将物理和化学起源的颜色结合在一起。此外，通过将不同的发光材料纳入光子晶体图案的不同部分，设计了一种高级信息加密系统，能够承载三种不同类型的信息。由于 MSAT 这一强大工具，现在可以将不同尺寸的、甚至是不规则的非球形单元与单分散球形单元组装成高质量的光子晶体膜，这为在光子晶体系统中引入新特性提供了便利。
