Electrochromic Devices Based on Poly(2,6-di(9H-carbazol-9-yl)pyridine)-Type Polymer Films and PEDOT-PSS

2,6-Di(9H-carbazol-9-yl)pyridine (DiCP) was synthesized and its corresponding homopolymer (PDiCP) and copolymers (P(DiCP- -CPDT), P(DiCP- -CPDT2), P(DiCP- -CPDTK), and P(DiCP- -CPDTK2)) were synthesized electrochemically. The anodic copolymer with DiCP:cyclopentadithiophene ketone (CPDTK) = 1:1 feed molar ratio showed high transmittance change (Δ %) and colouration efficiency ( ), which were measured as 39.5% and 184.1 cm² C at 1037 nm, respectively. Electrochromic devices (ECDs) were composed of PDiCP, P(DiCP- -CPDT), P(DiCP- -CPDT2), P(DiCP- -CPDTK), and P(DiCP- -CPDTK2) as anodically-colouring polymers, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid) (PEDOT-PSS) as cathodically-colouring polymers. P(DiCP- -CPDTK)/PEDOT-PSS ECD showed light silverish-yellow at 0.0 V, light grey at 0.7 V, grey at 1.3 V, light greyish blue at 1.7 V, and greyish blue at 2.0 V. Moreover, P(DiCP- -CPDTK)/PEDOT-PSS ECD presented high Δ (38.2%) and high (633.8 cm² C ) at 635 nm.