Dual-Mode Label with Dynamic Cracking-Wrinkling Pattern and Ultralong-Lifetime Phosphorescence for Multilevel...

Area of Science:

• Materials Science
• Optoelectronics
• Chemical Engineering

Background:

• Developing advanced materials for information security is crucial.
• Current dual-mode encryption materials have limited responsiveness and encryption capacity.
• Multilevel information encryption requires materials with enhanced capabilities.

Purpose of the Study:

• To demonstrate a dual-responsive optical membrane for multistage information encryption.
• To integrate ultralong-lifetime room-temperature phosphorescent (ULRTP) materials with dynamic cracking-wrinkling structures.
• To overcome limitations of current encryption materials.

Main Methods:

• Synthesized new ULRTP materials using boric acid, citric acid, and sodium bromide.
• Utilized external heavy-atom effect (EHE) from Br- anions to enhance intersystem crossing rate (ISC) and phosphorescence quantum yield (PHQY).
• Induced cracking-wrinkling patterns on an optical film via UV/ozone treatment.

Main Results:

• Achieved ULRTP materials with ultralong-lifetime (2.66 s) and high PHQY (35.3%).
• Demonstrated dynamic adjustment of surface structure and phosphorescent color under selective stimulation.
• Successfully integrated ULRTP and mechanical response structures for dual-mode encryption.

Conclusions:

• The developed optical membrane offers a promising approach for enhanced information security.
• The combination of ULRTP and dynamic mechanical structures enables multistage encryption.
• Potential applications in anti-counterfeiting and advanced message encryption were shown.