Abstract A novel herbal electrochromic device has been fabricated using raw hibiscus flower extract and its performance parameters have been studied. With no usage of any chemical to obtain extracts of herbal hibiscus flower is in itself a safe, economic way and a first such demonstration. Optical and electrochemical properties of the herbal extract have been studied using optical absorption and photoluminescence spectroscopies. The Cyclic Voltammetry curves of the extracted solution shows reversible redox activity with overall reducing behaviour corresponding to less than a volt. The redox induced color switching properties of the solution is studied by monitoring the spectral changes in its as-prepared and chemically reduced forms. The color change, when mimicked using dynamic doping, can also be achieved to form a solid state electrochromic device. Performance of such a fabricated device has been studied in terms of its color modulation, switching speed and cyclability. This demonstrates the first herbal electrochromic device using natural ingredients which leads the way to have better performing sustainable and environment friendly devices.

中文翻译：

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生木槿提取物作为新型草药电致变色装置的氧化还原活性生物材料

摘要 以木槿花原液为原料制备了一种新型草药电致变色器件，并对其性能参数进行了研究。不使用任何化学品来获得草本木槿花的提取物本身就是一种安全、经济的方式，也是第一次这样的示范。已经使用光吸收和光致发光光谱研究了草药提取物的光学和电化学特性。提取溶液的循环伏安曲线显示可逆氧化还原活性，整体还原行为对应于小于 1 伏。通过监测其制备的和化学还原形式的光谱变化来研究溶液的氧化还原诱导的颜色转换特性。颜色变化，当使用动态掺杂模仿时，也可以实现形成固态电致变色器件。已经在颜色调制、开关速度和可循环性方面研究了这种制造设备的性能。这展示了第一个使用天然成分的草本电致变色设备，它引领了具有更好性能的可持续和环境友好设备的道路。