Applications of copolymers consisting of 2,6-di(9H-carbazol-9-yl)pyridine and 3,6-di(2-thienyl)carbazole units as electrodes in electrochromic devices

Chung Wen Kuo, Jui Cheng Chang, Yu Ting Huang, Jeng-Kuei Chang, Li Ting Lee, Tzi Yi Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A series of carbazole-based polymers (PdCz, P(dCz2-co-dTC1), P(dCz2-co-dTC2), P(dCz1-co-dTC2), and PdTC) were deposited on indium tin oxide (ITO) conductive electrodes using electrochemical polymerization. The as-prepared P(dCz2-co-dTC2) displayed a high ΔT (57.0%) and multichromic behaviors ranging from yellowish green, greenish gray, gray to purplish gray in different redox states. Five organic electrochromic devices (ECDs) were built using dCz- and dTC-containing homopolymers andcopolymers as anodicmaterials, andpoly(3,4-(2,2-dimethylpropylenedioxy)thiophene) (PProdot-Me2) as the cathodic material. The P(dCz2-co-dTC2)/PProdot-Me2 ECD presented remarkable electrochromic behaviors from the bleached to colored states. Moreover, P(dCz2-co-dTC2)/PProdot-Me2 ECD displayed a high optical contrast (ΔT, 45.8%), short switching time (ca. 0.3 s), high coloration efficiency (528.8 cm2 C-1) at 580 nm, and high redox cycling stability.

Original languageEnglish
Article number1251
JournalMaterials
Volume12
Issue number8
DOIs
StatePublished - 1 Jan 2019

Keywords

  • Coloration efficiency
  • Copolymer
  • Electrochromic device
  • Electrochromic material
  • Redox stability
  • Spectroelectrochemistry

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