Conducting polymers have attracted attention as active materials for low power consuming, flexible devices with vivid colors and simple, room temperature processing methods. However, the conductive polymers with high-contrast electrochromic properties are limited in the literature. Here we achieve high-contrast electrochromic switching by copolymerization of newly synthesized an amide substituted dithienyl pyrrole (PBA) and 3,4-ethylenedioxythiophene (EDOT). In order to obtain the best optical properties of copolymer, spectral characteristics of the synthesized copolymers with different monomer feed ratios were investigated. Both homopolymer and copolymer films exhibit well defined redox and satisfied coloration efficiency. Spectroelectrochemistry studies indicate that the P(PBA-co-EDOT) has a lower bandgap (1.67 eV) and shows the excellent optical contrast (77% of 1000 nm) and coloration efficiency (697.01 cm2 C−1). The copolymer method provides a novel way to fabricate a freestanding organic electrochromic device. Additionally, the fluorescence properties of both monomer and polymer were investigated. P(PBA) having strong emission and good solubility and also P(PBA) has the potential to be used in OLEDs.

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A new organic-inorganic hybrid monomer, O-2-(9H-carbazyl) ferrocenyldithiophosphonate (CzFc), was synthesized and characterized. Electropolymerization was realized with an applied potential of 1.5 V in boron trifluoride diethyl etherate (BFEE). Spectroelectrochemical and colorimetry studies have shown that P(CzFc) has transmissive colored in neutral state. For switchable glass applications, it has to be two electrochromic polymers have tranmissive states in different oxidation states. So we were constructed dual-type complementary colored polymer switchable glass derived from P(CzFc) as anodically coloring material and P(EDOT) as cathodically coloring material in sandwich configuration. Optoelectrochemical studies indicate that the reduced state of the switchable glass shows blue color for the oxidized state whereas it shows transmissive color for the reduced state. P(CzFc)/P(EDOT) device has good switching time, high optical contrasts and excellent redox stability.

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