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Energy transfer engineering for programmable fluorescence dynamics in CsPbBr3 perovskite: Toward multimode

Zhen Wu1, Xin Zhang1, Yiyuan Tang1

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

Journal of Colloid and Interface Science
|February 9, 2026
PubMed
Summary

This study introduces a novel smart fluorescent material, SPD-CsPbBr3@PMMA, for advanced anti-counterfeiting. This material exhibits tunable fluorescence under different light conditions, offering enhanced security features.

Keywords:
Anti-counterfeitingEnergy transferFluorescencePhotoresponsiveperovskite nanocrystals

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Smart fluorescent materials are crucial for anti-counterfeiting.
  • Tunable fluorescence in response to stimuli is highly desirable.
  • Perovskite nanocrystals offer unique optical properties.

Purpose of the Study:

  • To develop a photoresponsive fluorescent material (PRFM) for advanced anti-counterfeiting applications.
  • To integrate perovskite CsPbBr3 with photochromic spiropyran (SPD) in PMMA.
  • To achieve multimode fluorescence outputs through external stimuli.

Main Methods:

  • Integration of CsPbBr3 nanocrystals and SPD within a PMMA matrix.
  • Characterization of fluorescence properties under different excitation wavelengths (blue, UV, visible light).
  • Investigation of energy transfer mechanisms using fluorescence decay spectra and theoretical calculations.

Main Results:

  • The developed material, SPD-CsPbBr3@PMMA, exhibits stable green fluorescence under blue-light excitation.
  • UV irradiation induces SPD isomerization, resulting in red fluorescence due to efficient energy transfer from CsPbBr3.
  • Visible light restores the original green fluorescence, demonstrating reversible fluorescence switching.
  • Multimode fluorescence changes were observed under room, blue, and UV light, enabling complex anti-counterfeiting strategies.

Conclusions:

  • The study successfully developed a novel multimode PRFM with tunable fluorescence.
  • Efficient energy transfer between CsPbBr3 and open-ring SPD is key to fluorescence modulation.
  • The material shows significant potential for advanced information anti-counterfeiting and security applications.