Cheng Qikuan, Sun Haotian, Yu Zhaohan, Gu Pengyu, Yuan Yi, Du Jiawei, Huang Beibei, Wang Dong, Zhang Lu, Wang Yunming, Zhou Huamin
State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
Department of Mechanical Engineering, Michigan State University, 474 S Shaw Ln, East Lansing,, MI, 48824, USA.
Small. 2025 Aug;21(33):e2502229. doi: 10.1002/smll.202502229. Epub 2025 May 2.
Responsive photonic crystals have garnered significant attention in recent years due to their remarkable capability of exhibiting dynamic color changes in response to external stimuli. Herein, a novel multistage anti-counterfeiting photonic crystal device that integrates chemical (luminescent material) and physical (photonic crystal structure) elements is reported. Based on photochromic materials and thermochromic capsules, a four-state thermochromic/photochromic photonic crystal (TPPC) composite film with dual responsiveness is developed through in situ emulsion polymerization and a straightforward roll shear technology. This innovative approach successfully resolved the issue of short-range order and long-range disorder in conventional photonic crystal films. Through the integration of a multilayer structure and a mask plate process, the dual effects of photochromic and thermochromic are seamlessly combined, enabling the film to exhibit four different optical states under the combined stimuli of temperature and UV light. Unlike tristate systems, the film integrates dual stimuli (UV + heat) for enhanced complexity. Notably, the film demonstrates multilevel responsiveness and dynamic decorative capabilities, allowing flexible switching between four optical states. Furthermore, the TPPC film boasts excellent mechanical properties (with a tensile strength exceeding 2 MPa), emphasizing its strong potential for applications in anti-counterfeiting, information encryption, and dynamic display technologies.
近年来，响应型光子晶体因其能够响应外部刺激而呈现动态颜色变化的卓越能力而备受关注。在此，报道了一种集成化学（发光材料）和物理（光子晶体结构）元素的新型多级防伪光子晶体器件。基于光致变色材料和热致变色胶囊，通过原位乳液聚合和简单的辊剪技术制备了具有双重响应性的四态热致变色/光致变色光子晶体（TPPC）复合膜。这种创新方法成功解决了传统光子晶体膜中短程有序和长程无序的问题。通过多层结构和掩膜板工艺的结合，光致变色和热致变色的双重效应得以无缝结合，使该膜在温度和紫外光的联合刺激下呈现四种不同的光学状态。与三态系统不同，该膜集成了双重刺激（紫外光+热）以增加复杂性。值得注意的是，该膜具有多级响应性和动态装饰能力，可在四种光学状态之间灵活切换。此外，TPPC膜具有优异的机械性能（拉伸强度超过2MPa），突显了其在防伪、信息加密和动态显示技术中的强大应用潜力。
