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Visible-Infrared Dual-Band Modulation Inorganic Electrochromic Colorful Smart Window.

Jiaming Yang1, Mengying Wang1, Zheng Meng2

  • 1School of Energy and Power Engineering, Beihang University, Beijing 100191, P. R. China.

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Summary
This summary is machine-generated.

This study presents a colorful electrochromic smart window using vanadium oxide and ITO films for dual-band visible-infrared modulation. The innovative design offers fast switching, high optical modulation, and long-term stability for diverse applications.

Keywords:
electrochromichigh stabilityinfrared emissivitymultibandsmart window

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Electrochromic (EC) technology modulates optical properties under electrical stimulation, crucial for smart windows.
  • Existing EC devices often lack dual-band visible-infrared (VIS-IR) modulation capabilities.
  • Vanadium oxide (V2O5) and Indium Tin Oxide (ITO) are key materials in optical device development.

Purpose of the Study:

  • To demonstrate a novel colorful electrochromic smart window with enhanced VIS-IR optical modulation.
  • To investigate the synergistic effects of V2O5 polaronic properties and ITO localized surface plasmon resonance (LSPR).
  • To achieve high performance in optical modulation amplitude, response times, and cycle stability.

Main Methods:

  • Fabrication of an electrochromic smart window device incorporating V2O5 and ITO films.
  • Characterization of VIS-IR optical properties and electrochromic performance under electrical stimulation.
  • Evaluation of color switching, response speed, optical modulation amplitude, and long-term cycling stability.

Main Results:

  • The smart window exhibited reversible yellow and green color switching.
  • Achieved fast response times: 3.0 s for VIS bleaching and 0.32 s for IR emissivity increase.
  • Demonstrated high optical modulation: ΔTmax = 53.2% at 850 nm (VIS-IR) and Δεmax = 0.57 at 4.8 μm (IR).
  • Maintained excellent stability over 10^4 reversible cycles.

Conclusions:

  • The developed EC smart window effectively achieves dual-band VIS-IR modulation using V2O5 and ITO.
  • The combination of polaronic effects and LSPR offers a promising strategy for advanced EC devices.
  • This work highlights the potential of multiband modulation for diversifying electrochromic applications.