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Tris(4-(thiophen-2-yl)phenyl)amine- and dithienylpyrrole-based copolymers (P(TTPA- co -DIT) and P(TTPA- co -BDTA)) were electropolymerized on ITO electrode by applying constant potentials of 1.0, 1.1, and 1.2 V. Spectroelectrochemical investigations revealed that P(TTPA- co -DIT) film displayed more color changes than P(TTPA- co -BDTA) film. The P(TTPA- co -DIT) film is yellow in the neutral state, yellowish-green and green in the intermediate state, and blue (1.2 V) in highly oxidized state. The ∆ T  max of the P(TTPA- co -DIT) and P(TTPA- co -BDTA) films were measured as 60.3% at 1042 nm and 47.1% at 1096 nm, respectively, and the maximum coloration efficiency (η) of P(TTPA- co -DIT) and P(TTPA- co -BDTA) films were calculated to be 181.9 cm²·C - ¹ at 1042 nm and 217.8 cm²·C - ¹ at 1096 nm, respectively, in an ionic liquid solution. Dual type electrochromic devices (ECDs) consisting of P(TTPA- co -DIT) (or P(TTPA- co -BDTA)) anodic copolymer, ionic liquid-based electrolyte, and poly(3,4-(2,2-diethylpropylenedioxy)thiophene) (PProDOT-Et₂) cathodic polymer were constructed. P(TTPA-co-BDTA)/PProDOT-Et₂ ECD showed high Δ T  max (48.1%) and high coloration efficiency (649.4 cm²·C - ¹) at 588 nm. Moreover, P(TTPA- co -DIT)/PProDOT-Et₂ and P(TTPA- co -BDTA)/PProDOT-Et₂ ECDs displayed satisfactory optical memory and long term switching stability.

Applications of Tris(4-(thiophen-2-yl)phenyl)amine- and Dithienylpyrrole-based Conjugated Copolymers in High-Contrast Electrochromic Devices