Key Lab for Material Chemistry of Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, and National Anti-Counterfeit Engineering Research Center, Huazhong University of Science and Technology (HUST), Wuhan, 430074, China.
Key Lab for Material Chemistry of Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, HUST, Wuhan, 430074, China.
Adv Sci (Weinh). 2022 Apr;9(10):e2105903. doi: 10.1002/advs.202105903. Epub 2022 Feb 3.
Orthogonal integration of thermosensitive images is of vital significance for advanced anticounterfeiting, which however remains formidably challenging due to the trade-off that facile thermoresponse needs easy molecular motion while robust imaging requires molecular restriction. Herein, a viable approach is demonstrated to tackle the challenge by in situ fixing a predesigned aggregation induced emission luminogen (AIEgen) at the polymer/liquid crystal (LC) interface via precisely controlled interfacial engineering, in which the AIEgen is enriched in LC phases during polymerization induced phase separation and subsequently driven to the interface by the interfacial thiol-ene click reaction. Crosstalk-free integration of holographic and fluorescent dual-thermosensitive images with high sensitivity, high contrast ratio, and robust performance is successfully realized in a single unit, attributed to the simultaneously LC-facilitated AIEgen molecular motion and polymer-restricted AIEgen diffusion at the interface. The exciting characteristics of these orthogonally integrated dual images will enable them to prevent illegal replication and thus are expected to be promising for high-security-level anticounterfeiting applications.
热敏图像的正交集成对于先进的防伪至关重要，但由于热敏响应需要易于分子运动，而稳健的成像需要分子限制之间的权衡，因此这仍然是一项极具挑战性的工作。在此，通过通过精确控制界面工程，在聚合物/液晶（LC）界面处原位固定预先设计的聚集诱导发射发光体（AIEgen），展示了一种可行的方法来解决这一挑战，在聚合诱导相分离过程中，AIEgen 在 LC 相中富集，随后通过界面硫醇-烯点击反应将其驱动到界面。通过界面工程，在单个单元中成功实现了全息和荧光双热敏图像的无串扰集成，具有高灵敏度、高对比度和稳健的性能，这归因于 LC 促进的 AIEgen 分子运动和界面处的聚合物限制的 AIEgen 扩散的同时作用。这些正交集成的双图像的令人兴奋的特性将使它们能够防止非法复制，因此有望在高安全级别的防伪应用中得到应用。
