Electrochromic Displays Having Two‐Dimensional CIE Color Space Tunability

• Published in: Advanced functional materials 2022-02, Vol.32 (7), p.n/a
• Main Authors: Zhang, Wu, Li, Haizeng, Elezzabi, Abdulhakem Y.
• Format: Article
• Language: English
• Subjects: Color; Displays; Electrochromic cells; electrochromic displays; Electrochromism; Materials science; two‐dimensional color space tunability; zinc anode‐based electrochromic devices
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.202108341

Electrochromic devices with a wide color gamut distribution have long been sought after for non‐emissive display technologies. The current state‐of‐the‐art multicolor electrochromic displays utilize a single electrochromic layer, which restricts their color tunability within a linear or curved segment scope in International Commission on Illumination (CIE) color space and thus leads to limited color hues. Herein, it is demonstrated vivid electrochromic displays with broadened color hues via fabricating Zn‐based multicolor electrochromic displays having 2D CIE color space tunability. In addition, it is revealed that a Fabry–Perot nanocavity structure can further tune the color hues via altering the coordinate of the 2D CIE color space. It is known that this is the first demonstration of 2D CIE color space tunability realization from a single transparent or reflective electrochromic device. These findings represent a novel strategy for fabricating multicolor electrochromic displays and are expected to advance the development of electrochromic displays. Electrochromic displays provide reversible switch of multiple colors and long‐term bistability. The first example of Zn anode‐based electrochromic displays having 2D color space tunability is presented to display multiple colors traversing a 2D International Commission on Illumination regional color space. These findings accelerate future electrochromic display technology that brings the full‐color tunability in a single electrochromic device within reach.