Optical encryption provides a significant implementation strategy for information security, which can be ascribed to multichannel, simple operation, and high security. Multiple responsive luminescent material has emerged as an ideal candidate for optical encryption, owing to intelligent responsive ability and unclonable security. Herein, a structural doping strategy is developed in the layer-by-layer self-assembly process to elevate the maneuverability of light-emitting color and mode. By encapsulating lanthanide doped inorganic matrix and layered hydroxide with PMA, the recognizable red-orange fluorescence can be produced in the invisible region, and realizes the conversion of yellow and green fluorescence in visible region. Meanwhile, both excitation source and emission color can be used as distinguishable encryption means, which enables structural doping complex to be multiplexed and encoded with high capacity and complexity. Furthermore, asymmetrically and symmetrically coded flexible labels with specific color sequence are prepared by brushing process, and specific encryption key are set to ensure the nonlinearity of cryptosystem. Through the integration of dual-mode and adjustable light response codes constructed by structural doping strategy, multidimensional high-level information encryption can be realized, which opens up a deep exploration in the field of information security for the application of multifunctional optical properties of light response materials.
Qingxiu Wang,Dong Zhou,Kai Gong,Xinpeng Lv,Peng Li,Yongjun Liu
Compared to static anti-counterfeiting, polymorphic dynamic anti-counterfeiting typically incorporates additional parameters specifically to increase the complexity of decryption. The development of security in flexible multi-dimensional materials holds significant implications for anti-counterfeiting applications in pharmaceuticals, food, and other products, yet it presents considerable challenges. Here, we propose a composite hydrogel film based on cholesteric liquid crystal (CLC) microspheres with photochromic spiropyran (SP) dyes and sodium alginate/N-isopropyl acrylamide. The film incorporates microspheres capable of synergistic color changes under light/heat stimuli. In the temperature range of 30–12 °C, CLC microspheres can achieve color tuning in the entire visible light band. By incorporating SP, the liquid crystal structural color can overlap with SP fluorescence/dye color. Furthermore, as a soft actuator, the flexible composite hydrogel can achieve a range of predesigned dynamic actuation effects such as biomimetic butterflies and flowers. By integrating the CLC microspheres with actuatable composite hydrogels, a sophisticated multidimensional dynamic anti-counterfeiting flexible label has been successfully realized. This not only enhances security and complexity in multidimensional dynamic anti-counterfeiting but also holds significant potential for applications in dynamic camouflage, bio-inspired actuation, and display sensing.
危险品化学品经营许可证（带存储）