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Time-Resolved Photochromic Ionic Hydrogen-Bonded Organic Frameworks for Multimodal Advanced Information Protection.

Yu-Ying Dai1, Li-Hui Cao1, Bin Zhou1

  • 1Shaanxi Key Laboratory of Chemical Additives for Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P. R. China.

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Summary

Researchers developed a novel material, R/S-iHOF-67, for advanced information encryption. This stimuli-responsive luminescent material offers dynamic, time-resolved anticounterfeiting solutions beyond traditional static methods.

Keywords:
information encryptionionic hydrogen-bonded organic frameworksmultimodalphotochromictime-resolved

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Area of Science:

  • Materials Science
  • Chemistry
  • Information Security

Background:

  • Stimuli-responsive luminescent materials are crucial for information anticounterfeiting.
  • Traditional static encryption methods have limitations in security.
  • Time-resolved strategies offer enhanced, dynamic encryption dimensions.

Purpose of the Study:

  • To construct a novel material for time-resolved information encryption.
  • To achieve high-order security through dynamic spatial stereoscopic evolution.
  • To develop multimodal information protection technologies.

Main Methods:

  • Charge-assisted supramolecular self-assembly of bis(benzene-p-sulfonic acid)-naphthalenediimide (p-H2BSNDI) and (1R/S,2R/S)-1,2-diphenylethylenediamine (R/S-DPEN) to form R/S-iHOF-67.
  • Dispersion of R/S-iHOF-67 in poly(vinyl alcohol) (PVA) matrix or organic solvents to enhance fluorescence and study photochromic properties.
  • Utilizing Förster resonance energy transfer (FRET) for time-resolved dynamic fluorescence.
  • Developing multicolor fluorescent ink and integrating with a 3D Rubik's Cube for 4D information encryption.

Main Results:

  • Successfully constructed R/S-iHOF-67 with excellent photochromic properties.
  • R/S-iHOF-67 solid powder exhibits high-contrast photochromic changes (pale yellow to light brown in 1s).
  • 0.5%-iHOF-67@PVA membranes show dynamic fluorescence behavior and photochromism under UV excitation.
  • A dynamic color-changing QR code and a 4D encryption system (temporal resolution) were realized.
  • Fluorescence sensitivity to solvent polarity enabled multicolor fluorescent ink development.

Conclusions:

  • R/S-iHOF-67 enables advanced, time-resolved information encryption and anticounterfeiting.
  • The developed 4D encryption system significantly increases complexity and decryption difficulty.
  • This work provides a reference for designing wide-range, time-resolved, multimodal information protection technologies.