Synthesis of Dimethyl-Substituted Polyviologen and Control of Charge Transport in Electrodes for High-Resolution Electrochromic Displays
Synthesis of Dimethyl-Substituted Polyviologen and Control of Charge Transport in Electrodes for High-Resolution Electrochromic Displays
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DOI：
10.3390/polym9030086
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发表时间：
2017-03
期刊：
影响因子：
5
通讯作者：
Kan Sato;Ryusuke Mizukami;Takahiro Mizuma;H. Nishide;K. Oyaizu
中科院分区：
文献类型：
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作者：
Kan Sato;Ryusuke Mizukami;Takahiro Mizuma;H. Nishide;K. Oyaizu
聚紫精等电致变色（EC）聚合物因其伴随可逆氧化还原反应的绚丽颜色变化而作为EC显示器的可湿加工电极而引起了人们的广泛关注。为了建立更广泛的用途，实现高分辨率和高分辨率特性是必不可少的。在这篇论文中，我们证明了在联吡啶单元中引入取代基如甲基改变了阳离子基团的立体结构，从而使颜色发生了变化（例如，普通紫色到蓝色）。此外，通过放松紫精部分之间的过度π-堆积，响应速率提高了10倍以上。整个聚紫精层的受控电荷传输引起了EC显示器的制造，其潜在地适合于薄膜晶体管（TFT）基板作为具有亚毫米像素的对电极。研究结果可用于具有增强的电化学性能和高分辨率的聚紫精的新设计。
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.