Transparent-To-Reflective Multicolor All-Solid-State Electrochromic Devices for Next-Generation Intelligent Display...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Inorganic all-solid-state electrochromic devices (ECDs) offer stability and process compatibility but are limited by monochromatic output.
• The demand for color displays in applications like transparent displays necessitates advancements beyond single-color electrochromism.

Purpose of the Study:

• To develop an all-solid-state electrochromic device capable of producing full-color displays.
• To overcome the monochromatic limitations of traditional inorganic electrochromic devices.

Main Methods:

• Fabrication of a WO3-based electrochromic device utilizing a dielectric-metal-dielectric (DMD) composite electrode.
• Optimization of optical interference within the DMD structure to achieve structural colors.
• Application of the additive color mixing principle with tunable electrochromic layers to broaden the color gamut.

Main Results:

• The device demonstrates a transparent-to-reflective switching mode and exhibits rainbow structural colors.
• A wide color gamut of up to 11.58% was achieved at a minimal bias voltage of ±1.5 V.
• Excellent electrochromic performance, cycling stability (≥5600 cycles), and low power consumption (3.8 mW cm⁻²) were recorded.

Conclusions:

• The developed device significantly expands the color-rendering capabilities of all-solid-state ECDs.
• The dual-mode (transmittance and reflection) operation and broad color gamut offer substantial potential for advertising, information display, and anti-counterfeiting applications.