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Spirooxazine-Based Solid-State Photoswitchable Fluorescent Materials for Advanced Time-Resolved Anti-Counterfeiting.

Zhen Wu1, Wenzhao Wang1, Lvming Qiu1

  • 1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.

ACS Applied Materials & Interfaces
|January 17, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel solid-state photoswitchable fluorescent compound, SO-TPE, for anticounterfeiting. This material exhibits reversible color and fluorescence changes under UV and visible light, enabling secure information encryption.

Keywords:
fluorescencephotoswitchablesolid statespirooxazinetime-resolved anticounterfeiting

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Area of Science:

  • Materials Science
  • Photochemistry
  • Organic Chemistry

Background:

  • Photoswitchable fluorescent materials offer tunable, high-contrast fluorescence valuable for anticounterfeiting.
  • Solid-state photoswitching remains a significant challenge in material design.

Purpose of the Study:

  • To design and synthesize a novel solid-state photoswitchable fluorescent compound.
  • To investigate its photoresponsive properties and potential for anticounterfeiting applications.

Main Methods:

  • Covalent linkage of spirooxazine (SO) and tetraphenylethene (TPE) moieties to create SO-TPE.
  • Characterization of solid-state photoswitching behavior under UV and visible light irradiation.
  • Spectroscopic analysis (fluorescence decay) and theoretical calculations to elucidate mechanisms.

Main Results:

  • SO-TPE exhibits reversible absorption and fluorescence modulation in the solid state.
  • UV exposure induces color change (light yellow to blue gray) and fluorescence switching (cyan to nonemission).
  • Mechanism involves photoisomerization of SO and intramolecular energy transfer between TPE and SO moieties.

Conclusions:

  • The designed SO-TPE compound is an effective solid-state fluorescent switch.
  • The strategy provides a pathway for advanced photoresponsive materials.
  • Potential applications include high-security anticounterfeiting and information encryption using Morse code.