A novel copolymer based on tris[4-(2-thienyl)phenyl]amine (TTPA) and 3,4-ethylenedioxythiophene (EDOT) was electrochemically synthesized. Characterizations of the resulting copolymer P(TTPA-co-EDOT) were performed by cyclic voltammetry (CV), UV-vis spectroscopy, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM). Spectroelectrochemical analysis reveals that the copolymer film has distinct electrochromic properties from that of the TTPA homopolymer film and shows five colors by applied different voltage. At the neutral state of the copolymer, the pi-pi* transition absorption peak was located at 488 nm and the optical bandgap (E-g) was calculated as 1.78 eV. The copolymer film shows a maximum optical contrast (Delta T%) of 30.6% at 460 nm with a response time of 0.68 s and of 45.0% at 800 nm with a response time of 0.92 s. An electrochromic device (ECD) based on P(TTPA-co-EDOT) and poly(3,4-ethylenedioxythiophene) (PEDOT) was constructed and characterized. The electrochromic device switched between violet red and blue upon application of -0.8 V and 1.4 V, respectively with reasonable optical contrast (24%), quick switching time (0.29 s) and excellent stability. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.040301jes] All rights reserved.