Photonic Security Labels with Triple-independent Optical Signal Enabled by Shear-Induced Colloidal Ordering in...

The increasing demand for information security is driving the rapid development of information encryption and anticounterfeiting technologies. Advanced information encryption systems capable of displaying different hidden information via simple triggers (e.g., illumination conditions) are promising yet challenging. Herein, inspired by the unique coloration and fluorescent features of P. oribazus butterflies, we present photonic security labels integrating triple-independent optical signals (i.e., structural color and two excitation wavelength-dependent fluorescence) by shear-induced colloidal ordering in dynamic lanthanide fluorescent metallosupramolecular networks (Ln-FMP) toward high-security-level information encryption and anticounterfeiting. The Ln-FMP can be rapidly fabricated by shearing the supramolecular composites consisting of lanthanide-coordinated polyurethane matrix and carboxylated polystyrene colloidal particles. By designing and encoding the diverse optical signals of Ln-FMP, high-security information encryption and anticounterfeiting labels with robust data storage capacity can be engineered. Furthermore, the abundant reversible supramolecular interactions endow Ln-FMP with excellent closed-loop recyclability and reutilization potential. Therefore, our study provides a reliable platform for the sustainable development of advanced intelligent information encryption and anticounterfeiting systems.