Wide-Gamut and High-Saturation Electrochromic Displays Enabled by Optical-Thickness Engineered Nanocavities.
basic_science · Level V
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- Record sourced from PubMed, PMID 41643736.
- Also identified by DOI 10.1021/acs.nanolett.5c05864.
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Abstract
Electrochromic (EC) displays offer low-power consumption and bistable operation but are intrinsically constrained by a limited color gamut and insufficient color saturation. Herein, we report an optical-thickness engineered Al/WO<sub>3</sub>/W/WO<sub>3</sub> metal-dielectric-metal-dielectric (MDMD) architecture for wide-gamut, highly saturated color EC displays. By tailoring the optical thickness of the outer WO<sub>3</sub> layer to λ/4, λ/2, or λ, wavelength-selective interference is achieved, enabling suppression of parasitic reflection peaks and narrowing of the reflection bandwidth beyond conventional Fabry-Pérot cavities. The optimized MDMD structure achieves ∼90% coverage of the standard RGB color space with near-unity color saturation. Notably, the MDMD electrode with a 93 nm WO<sub>3</sub> layer exhibits reversible switching from cyan to deep blue while maintaining full color saturation, enabled by potential-controlled Li<sup>+</sup> insertion/extraction that dynamically modulates the optical constants and shifts the nanocavity resonance. This work establishes optical-thickness engineering as an effective strategy for simultaneously enhancing color gamut and saturation in EC displays.