• • TS-FRET between BCA2PAM and R6G enables precise color tuning, with a 1 s delayed reappearance of 'appear' after UV off, providing a time-resolved encryption dimension that thwarts static counterfeit inspection.
• • Laser power variation (high vs. low) on R6G-doped BCA2PAM films produces distinct visible patterns under UV and afterglow, allowing multilevel encryption; high-power QR codes are invisible under UV but emerge after breath exposure, offering humidity-triggered authentication.
• • Integration with PDMS yields luminescent elastomers, and PET adhesive tapes create tamper-evident labels with customizable branding, demonstrating mechanical robustness and adaptability for industrial labeling.
• • Rewritable capability: laser-written patterns visible under UV can be erased under ambient humidity and re-encrypted with new motifs, enabling reuse and reducing material waste in high-end anti-counterfeiting applications.