Multilevel Intelligent Anti-Counterfeiting Label with Spatially Selective Dynamic Aurora Response and 3D Mesoscopic...

With the increasing demand for anti-counterfeiting measures, the efficient integration of multi-level optical anti-counterfeiting information has become a critical challenge. In this study, a novel bottom-up self-assembly technique is introduced for fabricating composite integrated films. This method overcomes the size limitations of phosphors that achieve circularly polarized light (CPL) through co-assembly with cellulose nanocrystals. Specifically, rare earth metal-organic frameworks with a length of 140 µm can generate CPL with an asymmetry factor of 0.65. Moreover, the introduction of random defects in the film imparts unpredictable CPL properties, enabling dynamic auroral anti-counterfeiting within the decryption optical path. Additionally, an innovative two-stage serial decryption process is proposed by leveraging the non-correlation between orthogonal decryption patterns. Notably, the label surface features biomimetic fingerprint textures that exhibit 3D physical unclonable functions (PUFs) at the mesoscopic scale. These textures possess high entropy close to the ideal value of 1, and an encoding capacity in a 175 × 175 µm² area reaches 2⁶²⁵⁰⁰. In summary, the composite label achieves a high degree of integration by combining three levels optical anti-counterfeiting information: full-chromatographic tunable photoluminescence, spatially selective random dynamic aurora responses, and 3D bionic mesoscopic PUFs fingerprints.