Intercalation-based inorganic materials that change their colours upon ion insertion/extraction lay an important foundation for existing electrochromic technology. However, using only such inorganic electrochromic materials, it is very difficult to achieve the utmost goal of full-colour tunability for future electrochromic technology mainly due to the absence of structural flexibility. Herein, we demonstrate an ultracompact asymmetric Fabry-Perot (F-P) nanocavity-type electrochromic device formed by using partially reflective metal tungsten as the current collector and reflector layer simultaneously; this approach enables fairly close matching of the reflections at both interfaces of the WO3 thin layer in device form, inducing a strong interference. Such an interference-enhanced device that is optically manipulated at the nanoscale displays various structural colours before coloration and, further, can change to other colours including blue, red, and yellow by changing the optical indexes (n, k) of the tungsten oxide layer through ion insertion.

中文翻译：

---

使用超紧凑法布里-珀罗纳米腔，实现无机电致变色器件的全色可调性。

离子插入/提取时会改变颜色的基于插层的无机材料为现有电致变色技术奠定了重要基础。但是，仅使用这种无机电致变色材料，由于缺乏结构柔性，很难实现未来电致变色技术的全色可调性的最大目标。本文中，我们演示了通过同时使用部分反射金属钨作为集电器和反射层而形成的超紧凑非对称Fabry-Perot（FP）纳米腔型电致变色器件。这种方法可以使WO3薄层的两个界面处的反射形式非常接近匹配，从而产生强烈的干扰。