Abstract

1,4-benzodioxan-based polydithienylpyrrole (PBDO) is electrochemically synthesized. Cyclic voltammograms are acquired to examine the redox properties of the PBDO films at various scan rates. Spectroelectrochemical and colorimetric studies are also conducted. The PBDO homopolymer has a bandgap of 2.38 eV and displays yellowish-green to bluish-violet coloration upon doping. Electrochromic devices (ECDs) that employ PBDO as an anodic polymer and poly(3,4-(2,2-diethylpropylenedioxy)thiophene) (PProDOT-Et2) (or poly(3,4-ethylenedioxythiophene) (PEDOT)) as a cathodic polymer are constructed. The PBDO/PProDOT-Et2 ECD shows higher ΔTmax (32.3%) and coloration efficiency (η, 437.5 cm2 C−1) at 586 nm than those of PBDO/PEDOT ECD (ΔTmax = 20.2%, η = 152.0 cm2 C−1 at 606 nm). The PBDO/PEDOT and PBDO/PProDOT-Et2 ECDs show satisfactory optical memories and redox stability.

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