Propylenedioxythiophene (ProDOT)–phenylene copolymers allow a yellow-to-transmissive electrochrome

In order to create multicolour displays using electrochromic (EC) technologies, the modulation of the intensity of three primary subtractive colours (red, yellow, blue, or cyan, magenta, yellow) could be used to express any colour in the spectrum. Herein we report the first cathodically colouring yellow-to-transmissive switching EC polymer, which completes a full colour palette and promises to fulfil the requirements necessary to create multicolour EC displays.