Dynamic multimodal information encryption combining programmable structural coloration and switchable circularly polarized luminescence
Zeyu Feng, Jialei Li, Peng Yang, Xiangxiang Xu, Di Wang, Jiahe Li, Chutian Zhang, Jingguo Li, Hongli Zhang, Gang Zou, Xin Chen
Abstract
Multimodal optical-materials are highly desirable due to their advantages in enhancing information security, though independent modulation is challenging, especially accurately controlling the orthogonal relationship between the structural coloration (SC) and fluorescence (FL) pattern. Herein, we report a strategy which combines programmable structural coloration and switchable circularly polarized luminescence (CPL) for multimodal information encryption. Using photomask with aligned grating, programmable periodic patterns are fabricated on a polydiacetylene (PDA) gel film, which produces image in tunable structural colors. Introducing a chiral fluorescence layer containing perovskite nanocrystals and twisted-stacking Ag nanowires (NWs) bilayers, which provides stimuli-responsive FL and CPL with high dissymmetry factor (glum, up to 1.3). Importantly, the structural coloration information and FL patterns (including CPL pattern) can be independently modulated without mutual interference, even selectively concealed or exposed by varying microstructure design of the cross-linked PDA gel or by acetonitrile treatment. Multimodal optical-materials are highly desirable due to their advantages in enhancing information security, though independent modulation is challenging. Here, the authors report a method using coloration and switchable fluorescence for information encryption.