Abstract
In this work, we synthesize the 1,4-di(2-thienyl)benzene (TPhT) by Suzuki coupling reaction. Polythiophene (PT) and poly[1,4-di(2-thienyl)benzene] (PTPhT) films on indium tin oxide (ITO) glass (PT/ITO, PTPhT/ITO) are prepared by electrochemical polymerization, and further assembled into the electrochromic devices (ECDs). The results indicate that PTPhT film possesses loose granular morphology, large surface area and high electrochemical activities. In comparison to PT (light red), the color of PTPhT film becomes goldenrod. Although the properties of ECD based on PTPhT/ITO are not greatly improved, the change of wavelength corresponding to maximum transmittance change of device is significant (blue shift from 741 nm to 641 nm), demonstrating that benzene ring incorporation in the backbone is an effective method to tune the color of ECD based on PT/ITO. This study suggests that structural changes in backbone can optimize optical features without sacrificing EC properties, and provide a facile strategy for designing vibrantly colored electrochromic polymers.
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