Rewritable Photoluminescence and Structural Color Display for Dual-Responsive Optical Encryption

Area of Science:

• Materials Science
• Optics
• Nanotechnology

Background:

• Optical encryption offers secure data protection via coloration and photoluminescent (PL) materials.
• Current methods lack independent control over wavelength-tunable coloration and variable light intensity PL.

Purpose of the Study:

• To develop a rewritable dual-responsive optical encryption display.
• To achieve independent control over structural color (SC) and PL properties for enhanced security.

Main Methods:

• Utilized a stimuli-responsive block copolymer (BCP) photonic crystal (PC) with self-assembled perovskite nanocrystals.
• Controlled SC via perovskite precursor doping times and developed PL properties of nanocrystals.
• Demonstrated rewritable SC and PL information programming.

Main Results:

• Achieved environmentally stable SC and PL dual-mode displays with perovskite nanocrystals (PL quantum yield ≈33.7%).
• Independently programmed SC and PL information was erasable and rewritable.
• Demonstrated dual-responsive optical encryption, deciphering Morse code only when SC and PL information were combined.

Conclusions:

• The developed dual-mode encryption display offers novel optical encryption with high information security.
• Numerous SC and PL combinations enable a high level of data anti-counterfeiting.
• This technology advances secure optical data storage and authentication.