Abstract
Electrochromism is defined as the ability of a material to reversibly and continuously change its colour by means of an electrochemical reaction. In the present article the most relevant applications of these materials are described, together with the colour change process, the most widely employed organic electrochromic materials (conducting polymers) and the device assembling process. Limitations and perspectives of this technology in a near future are also discussed, in the fields of image generation as well as domotics.