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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Thermo-Responsive Tri-State Photonic Crystals.

Yuewei Zheng1, Jinqing Chen1, Wanqi Mo1

  • 1Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 4, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed novel thermo-responsive photonic crystals for advanced anti-counterfeiting. These dynamic materials exhibit tunable structural color, fluorescence, and organic afterglow for secure, multi-modal information storage.

Keywords:
organic afterglowphotonic crystalsstructural colorsthermochromictri‐mode encryption

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Counterfeiting poses a significant global economic threat, with existing anti-counterfeiting measures struggling against sophisticated fakes.
  • Developing dynamic, multi-modal anti-counterfeiting materials remains a key challenge in materials science.

Purpose of the Study:

  • To present a novel thermo-responsive tri-state photonic crystal system for advanced anti-counterfeiting applications.
  • To overcome limitations in current anti-counterfeiting technologies by enabling dynamic, multi-modal optical responses.

Main Methods:

  • Fabrication involved incorporating organic phosphors into polymeric colloids and embedding thermochromic microcapsules into colloidal crystals.
  • The system utilizes solid-phase extraction and regulates light scattering/absorption for energy transfer.
  • A novel far-field light absorption-based energy transfer mechanism was employed to preserve afterglow lifetime.

Main Results:

  • The photonic crystals demonstrated thermochromism across three optical states: fluorescence (FL), phosphorescence, and structural coloration.
  • The developed system successfully decoupled energy transfer efficiency from afterglow lifetime, a significant improvement over traditional methods.
  • Tunable thermochromic temperatures and diverse organic phosphors allowed for the creation of multi-responsive anti-counterfeiting patterns.

Conclusions:

  • The presented thermo-responsive tri-state photonic crystals offer a promising platform for dynamic, high-capacity, and multimodal anti-counterfeiting solutions.
  • This strategy advances the field of intelligent materials for secure information storage and authentication.
  • The research paves the way for next-generation anti-counterfeiting technologies with enhanced security features.