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Photoelectric Effect02:26

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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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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Dual Responsive Dependent Background Color Based on Thermochromic 1D Photonic Crystal Multilayer Films.

Yejin Kim1, Seo Hyun Kim1, Henok Getachew Girma1

  • 1Center for Advanced Specialty Chemicals, Korea Research Institute of Chemical Technology (KRICT), Ulsan 44412, Republic of Korea.

Polymers
|December 11, 2022
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Summary

We developed dual-responsive photonic crystal films that change color with temperature and humidity. These novel materials offer reversible color transitions for applications like anti-counterfeiting and smart decorations.

Keywords:
1D photonic crystaldual responsivehumiditytemperature responsivethermochromic

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Photonic crystals (PCs) offer tunable optical properties.
  • Developing stimuli-responsive materials is crucial for advanced applications.
  • Existing materials often lack multi-responsive capabilities.

Purpose of the Study:

  • To create novel dual-responsive one-dimensional (1D) photonic crystal (PC) multilayer films.
  • To investigate the colorimetric response of these films to humidity and temperature changes.
  • To explore potential applications in anti-counterfeiting and smart decoration.

Main Methods:

  • Fabrication of 1D PC multilayer films using sequential alternate layer deposition.
  • Utilizing photo-crosslinkable polymers with high and low refractive indices (P(2VN-co-BPA) and P(4VP-co-BPA)).
  • Incorporating a thermochromic film as a background for temperature-dependent color shifts.

Main Results:

  • The films exhibit dual responsiveness to high humidity (>90% RH) and temperature variations.
  • Visible spectrum color changes were observed, including synthesized colors like yellow, magenta, and cyan.
  • The films demonstrated reliable reversibility in their color transitions.
  • Color changes were dependent on both background color (temperature-induced) and ambient humidity.

Conclusions:

  • This work presents the first report of dual-response colorimetric films responding to both temperature and humidity.
  • The developed films show potential for anti-counterfeiting labels and smart decorative applications.
  • The tunable and reversible nature of these films opens avenues for diverse technological uses.