Unclonable Perovskite Fluorescent Dots with Fingerprint Pattern for Multilevel Anticounterfeiting

Area of Science:

• Materials Science
• Nanotechnology
• Optics

Background:

• Physical unclonable functions (PUFs) are crucial for anticounterfeiting across diverse products.
• Existing PUF methods require complex fabrication and lack multilevel security features.

Purpose of the Study:

• To propose a facile strategy for fabricating unclonable super micro fingerprint (SMFP) arrays.
• To develop multilevel anticounterfeiting labels with enhanced security features using perovskite crystals.

Main Methods:

• Fabrication of SMFP arrays via inkjet printing of perovskite precursor droplets.
• Utilizing in situ crystal growth, random crystallization, and Ostwald ripening for unique patterns.
• Translating 3D height information into structural color for enhanced security.

Main Results:

• Successfully created unclonable perovskite patterns based on differential droplet transport and crystallization.
• Demonstrated tunable anticounterfeiting properties by controlling crystallization conditions.
• Achieved multilevel security with macroscale patterns, microscale unclonable patterns, fluorescent 2D patterns, and 3D structural color.

Conclusions:

• The proposed SMFP fabrication offers a promising approach for advanced anticounterfeiting solutions.
• Perovskite-based multilevel security labels provide robust protection against counterfeiting.
• The technique allows for customizable and scalable production of high-security labels.