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

Area of Science:

• Materials Science
• Optics
• Nanotechnology

Background:

• Growing demand for effective anti-counterfeiting solutions.
• Challenges in integrating multi-level optical security information.
• Limitations in current phosphor-based circularly polarized light (CPL) generation.

Purpose of the Study:

• To develop a novel bottom-up self-assembly technique for composite integrated anti-counterfeiting films.
• To overcome size limitations of phosphors for CPL generation.
• To introduce multi-level optical anti-counterfeiting features including dynamic responses and 3D physical unclonable functions (PUFs).

Main Methods:

• Bottom-up self-assembly of composite films using cellulose nanocrystals and rare earth metal-organic frameworks.
• Co-assembly to achieve controlled CPL generation.
• Introduction of random defects for dynamic CPL properties and development of a two-stage serial decryption process.

Main Results:

• Fabrication of composite films capable of generating CPL with an asymmetry factor of 0.65.
• Demonstration of dynamic auroral anti-counterfeiting effects via spatially selective random responses.
• Creation of biomimetic fingerprint textures with high entropy (near 1) and massive encoding capacity (2^62500) in a small area.

Conclusions:

• The developed composite label integrates three levels of optical anti-counterfeiting information: tunable photoluminescence, dynamic aurora responses, and 3D bionic PUFs.
• The technique overcomes previous size limitations and enables advanced, multi-layered security features.
• The study offers a promising approach for high-security anti-counterfeiting applications.