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Photoswitchable and Reversible Fluorescent Eutectogels for Conformal Information Encryption.

Changchun Li¹, Jize Liu¹, Xiaoyan Qiu¹

¹State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China.

Angewandte Chemie (International Ed. in English)

|October 4, 2023

Summary

Researchers developed a novel fluorescent gel inspired by octopuses for advanced anti-counterfeiting. This smart material offers reversible patterns, strong adhesion, and self-healing for secure information encryption.

Keywords:

Anthracene-Containing Eutectogel Conformal Adhesion Information Encryption Photoswitchable Fluorescence Self-Healing

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Area of Science:

Materials Science
Optoelectronics
Polymer Chemistry

Background:

Smart fluorescent materials are crucial for information encryption and anti-counterfeiting applications.
Traditional materials often lack tunable fluorescence and robust adhesion, limiting practical use.
Developing materials with adaptive adhesion and reversible optical properties is a key challenge.

Purpose of the Study:

To create a reversible fluorescent eutectogel with high transparency, adhesion, and self-healing properties.
To enable conformal information encryption and anti-counterfeiting using stimuli-responsive fluorescence.
To overcome limitations of traditional fluorescent materials in tunable fluorescence and adhesion.

Main Methods:

Fabrication of a eutectogel using anthracene as the luminescent unit.
Utilizing photoswitchable fluorescence for reversible pattern writing/erasing via non-contact stimulation.
Demonstrating surface-adaptive adhesion across a wide temperature range (-20 to 65°C) and high deformability (>1000 cycles).

Main Results:

The eutectogel exhibits reversible photoswitchable fluorescence for pattern encryption.
Achieved strong, conformal adhesion to irregular substrates with self-healing capabilities.
Demonstrated dual encryption under UV and stretching conditions, enhancing security.
The material maintained performance after extensive deformation and over a broad temperature range.

Conclusions:

The developed eutectogel offers a promising solution for advanced intelligent anti-counterfeiting materials.
Its unique combination of tunable fluorescence, adaptive adhesion, and self-healing properties addresses key limitations.
This work paves the way for novel applications in secure information storage and authentication.