Copolymers based on 1,3-bis(carbazol-9-yl)benzene and three 3,4-ethylenedioxythiophene derivatives as potential anodically coloring copolymers in high-contrast electrochromic devices

Chung Wen Kuo, Teng Lu Wu, Yuan Chung Lin, Jeng-Kuei Chang, Ho Rei Chen, Tzi Yi Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

In this study, copolymers based on 1,3-bis(carbazol-9-yl)benzene (BCz) and three 3,4-ethylenedioxythiophene derivatives (3,4-ethylenedioxythiophene (EDOT), 3,4-(2,2-dimethylpropylenedioxy) thiophene (ProDOT-Me 2 ), and 3,4-ethylenedithiathiophene (EDTT)) were electrochemically synthesized and their electrochemical and electrochromic properties were characterized. The anodic copolymer P(BCz-co-ProDOT) with BCz/ProDOT-Me 2 = 1/1 feed molar ratio showed high optical contrast (ΔT%) and coloring efficiency (η), measured as 52.5% and 153.5 cm 2 ·C -1 at 748 nm, respectively. Electrochromic devices (ECDs) based on P(BCz-co-EDOT), P(BCz-co-ProDOT), and P(BCz-co-EDTT) as anodic polymer layers, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid) (PEDOT-PSS) as cathodic polymer layer were fabricated. P(BCz-co-ProDOT)/triple-layer PEDOT-PSS ECD showed three different colors (light yellow, yellowish-blue, and dark blue) at different applied potentials. In addition, the highest optical contrast (ΔT%) of P(BCz-co-ProDOT)/triple-layer PEDOT-PSS ECD was found to be 41% at 642 nm and the coloration efficiency was calculated to be 416.5 cm 2 ·C -1 at 642 nm. All ECDs showed satisfactory optical memories and electrochemical cyclic stability.

Original languageEnglish
Article number368
JournalPolymers
Volume8
Issue number10
DOIs
StatePublished - 19 Oct 2016

Keywords

  • Coloration efficiency
  • Conducting polymer
  • Electrochemical polymerization
  • Electrochromic device
  • Optical contrast
  • Poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid)

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