Color tuning of black for electrochromic polymers using precursor blendsElectronic supplementary information (ESI) available: Electrochemistry, spectroelectrochemistry, switching speed study, and device fabrication. See DOI: 10.1039/c3cc41584h

We demonstrate a facile controlling of the optical and colorimetric properties of a donoracceptor conjugated polymer simply by varying the mix ratio of two precursors in a precursor blend. The conversion of a precursor blend results in an entirely new donoracceptor polymer, distinct from the conjugated polymer of each precursor. Careful optimization of the mix ratio of two precursors results in a black electrochromic polymer. Color tuning of black electrochromic conjugated polymers is demonstrated by a precursor approach.