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Polymers 2017, 9(3), 86;

Synthesis of Dimethyl-Substituted Polyviologen and Control of Charge Transport in Electrodes for High-Resolution Electrochromic Displays

Department of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan
Authors to whom correspondence should be addressed.
Academic Editor: Jodie Lutkenhaus
Received: 7 January 2017 / Revised: 17 February 2017 / Accepted: 26 February 2017 / Published: 3 March 2017
(This article belongs to the Special Issue Electroactive Polymers and Gels)
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Electrochromic (EC) polymers such as polyviologens have been attracting considerable attention as wet-processable electrodes for EC displays, thanks to their brilliant color change accompanied with reversible redox reactions. To establish wider usage, achieving multicolor and high-resolution characteristics is indispensable. In this paper, we demonstrated that the introduction of substituents such as methyl groups into bipyridine units changed the stereostructure of the cation radicals, and thus shifted the color (e.g., ordinary purple to blue). Also, by relaxing excessive π-stacking between the viologen moieties, the response rate was improved by a factor of more than 10. The controlled charge transport throughout the polyviologen layer gave rise to the fabrication of EC displays which are potentially suitable for the thin film transistor (TFT) substrate as the counter electrodes with submillimeter pixels. The findings can be versatilely used for the new design of polyviologens with enhanced electrochemical properties and high-resolution, multicolor EC displays. View Full-Text
Keywords: electroactive polymer; electrochromic cells; energy storage; electronics electroactive polymer; electrochromic cells; energy storage; electronics

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Sato, K.; Mizukami, R.; Mizuma, T.; Nishide, H.; Oyaizu, K. Synthesis of Dimethyl-Substituted Polyviologen and Control of Charge Transport in Electrodes for High-Resolution Electrochromic Displays. Polymers 2017, 9, 86.

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