Dynamic Multicolor Display with Wide Color Gamut Enabled by Vanadium Oxide‐Based Fabry–Pérot Electrochromic Nanocavities

• Published in: Laser & photonics reviews Vol. 19; no. 7
• Main Authors: Li, Huiying, Cao, Sheng, Bao, Longqiang, Liu, Yuwei, Chen, Junyao, Qin, Shihua, Huang, Lin, Wan, Lingyu
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.04.2025
• Subjects: Color; color gamut; Displays; dynamic modulation; Electrochromism; Fabry–Pérot nanocavity; Lithium ions; Modulation; Optical properties; Refractivity; Structural analysis; vanadium oxide; Vanadium oxides
• ISSN: 1863-8880; 1863-8899
• DOI: 10.1002/lpor.202401770

Inorganic electrochromic (EC) devices with vibrant multicolor variations are at the forefront of EC technology and play a crucial role in display applications. Expanding the dynamic color gamut of a single EC device has long been a subject of investigation. Herein, a design is presented that employs vanadium oxide (VOx) as the EC layer and tungsten (W) as the reflective layer to construct an asymmetric Fabry–Pérot (F–P) nanocavity, enabling wide color gamut EC displays. By leveraging the different thicknesses of VOx, this design allows for a range of color changes from yellow and orange to magenta, purple, blue, cyan, and green through dynamic EC modulation. Notably, a typical single W‐VOx (150 nm) F–P nanocavity demonstrates an impressive modulation range of 110 nm, exceeding the capabilities of existing F–P nanocavities. In‐depth structural analysis reveals that the insertion and extraction of Li+ ions significantly influence the microstructure and optical properties of VOx film, allowing for greater refractive index adjustment than WO3. This facilitates precise control and expansion of the nanocavity's color range through interference effects. This study provides a new perspective for developing dynamically adjustable wide color gamut EC displays and highlights their potential applications in flexible display technologies. A wide color gamut electrochromic display utilizing asymmetric VOx‐based Fabry–Pérot nanocavities is presented. This design enables exceptional color modulation from a single electrode, achieving dynamic transitions across magenta, purple, blue, and green hues by adjusting the VOx film thickness. Structural analysis reveals the role of Li+ ions dynamics in influencing optical properties, facilitating advanced applications in flexible display electronics.