Enhanced electrochromic performances of Polythieno[3,2-b]thiophene with multicolor conversion via embedding EDOT segment

Enhanced electrochromic performances of Polythieno[3,2-b]thiophene with multicolor conversion via embedding EDOT segment
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通过嵌入 EDOT 片段增强聚噻吩并[3,2-b]噻吩的电致变色性能并实现多色转换

DOI:
10.1016/j.polymer.2018.11.018
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发表时间:
2018-12
期刊:
影响因子:
4.6
通讯作者:
Jingkun Xu
Jingkun Xu
中科院分区:
化学2区
文献类型:
--
作者:
Yu Xue;Zexu Xue;Wenwen Zhang;Wenna Zhang;Shuai Chen;Kaiwen Lin;Jingkun Xu

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以噻吩并[3,2-B]噻吩(TT)为封端的3,4-乙撑二氧噻吩(EDOT)单元为杂环齐聚物,成功地合成了P(TT-EDOT-TT)。为了深入了解结构修饰对单体和/或聚合物的物理化学性质和电致变色性能的影响,系统地研究了吸收光谱、电化学、微观形貌和光谱电化学。与TT和EDOT相比,TT-EDOT-TT在分子水平上具有较长的π共轭和较窄的带隙。通过与PTT的比较发现,P(TT-EDOT-TT)薄膜的电致变色性能在近红外区具有更高的光学对比度(69%)、上级的显色效率(255.3 cm ~ 2C-1)和转换时间(1 s以内,而PTT为36.8 cm ~ 2C-1)。值得注意的是,P(TT-EDOT-TT)薄膜可以在可变电压下实现RGB原色(红-绿-蓝)之间的相互转换,这在显示应用中具有相当大的前景。
A heterocyclic oligomer, thieno[3,2-b]thiophene (TT) end-capped famous 3,4-ethylenedioxythiophene (EDOT) unit and their electrosynthesized polymer P(TT-EDOT-TT) have been facilely achieved. To in-depth understand the effects of structural modification on physico-chemical properties and electrochromic performances of monomers and/or polymers, the absorption spectroscopy, electrochemistry, micromorphology, and spectroelectrochemistry were systematically studied. In contrast to TT and EDOT, TT-EDOT-TT possessed extended π-conjugation and narrowed band gap in molecular level. Through carefully comparison with PTT, it has been found that the electrochromic performances of P(TT-EDOT-TT) film exhibited much higher optical contrast (69%, while 3% for PTT in the near-infrared region) and superior coloring efficiency (255.3 cm2C−1, while 36.8 cm2C−1for PTT), and switching times (within 1 s, while more than 9 s for PTT). Notably, P(TT-EDOT-TT) film can achieve the mutual conversion between RGB primary colors (red–green–blue) under variable voltages, which hold quite promising for display applications.
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