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Related Concept Videos

Color Vision01:24

Color Vision

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Related Experiment Video

Updated: Mar 20, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Multicolor Electrochromics: Rainbow-Like Devices.

Yolanda Alesanco1, Ana Viñuales1, Jesús Palenzuela1

  • 1IK4-CIDETEC Research Center, Paseo Miramón 196, 20009 Donostia-San Sebastián, Spain.

ACS Applied Materials & Interfaces
|May 21, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed novel electrochromic devices using viologen-based gels. These smart materials offer multiple, switchable colors, advancing multicolor display technology.

Keywords:
PVA gelsmultielectrochromicspolyelectrolytessmart windowsviologens

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Area of Science:

  • Materials Science
  • Electrochemistry

Background:

  • Stimuli-responsive materials with reversible color change are in high demand for smart systems.
  • Electrochromic materials are versatile but typically offer only a single color, limiting applications.
  • Achieving multicolor capabilities with simple electrochromic approaches remains a significant challenge.

Purpose of the Study:

  • To develop electrochromic devices capable of multiple, distinct color states.
  • To demonstrate a simple fabrication method for multicolor electrochromic systems.
  • To expand the potential of electrochromic technology for advanced applications.

Main Methods:

  • Fabrication of polyvinyl alcohol (PVA) gel-based electrochromic devices.
  • Incorporation of single and multiple viologen compounds into the gel matrix.
  • Design of a device architecture with four-zoned electrodes for multicolor switching.

Main Results:

  • A PVA gel-based device with a single viologen exhibited colorless and two distinct colored states.
  • A novel multi-viologen electrochromic gel (multi-EC gel) device demonstrated five switchable colors.
  • The "rainbow-like" electrochromic display (ECD) featured a simple architecture (glass/TCO/multi-EC gel/TCO/glass).

Conclusions:

  • The developed multichromic system is easy to fabricate and offers significant potential for full-color electrochromic devices.
  • This breakthrough expands the capabilities of electrochromic technology beyond single-color applications.
  • The novel approach paves the way for more sophisticated and versatile smart display systems.