Design Strategy for Efficient Solution-Processable Red Electrochromic Polymers Based on Unconventional 3,6-Bis(dodecyloxy)thieno[3,2-b]thiophene Building Blocks

作者：Yin, Yuyang; Li, Weishuo; Zeng, Xianzhe; Xu, Panpan; Murtaza, Imran; Guo, Yitong; Liu, Yumeng; Li, Tingting; Cao, Jupeng; He, Yaowu^*; Meng, Hong^*

来源：Macromolecules, 2018, 51(19): 7853-7862.

DOI：10.1021/acs.macromol.8b01213

• CONJUGATED POLYMERS
• CONDUCTING POLYMERS
• HIGH-CONTRAST
• PERFORMANCE
• BIPOLARONS
• POLARONS
• DEVICES
• UNITS
• FILM
• POLYTHIOPHENES

In the quest for solution-processable red electrochromic material with high performance, a series of 3,6-bis(dodecyloxy)thieno[3,2-b]thiophene (DOTT)-based polymers have been designed by combining DOTT with different aromatic building blocks (bithiophene, benzene, and dimethoxybenzene) and prepared through Pd-catalyzed chemical copolymerization. Among them, the solution-processable polymer poly(2,5-dimethoxypheny1-1,4-diy1-3,6-bis-(dodecyloxy)thieno[3,2-b]thiophene) (P3) showed obvious yellow-green fluorescence in chloroform and demonstrated a rapid reversible switching (1.1 s/0.9 s for doping/dedoping process) between the red and bleached states. This brilliant red polymer exhibited moderate contrast (46% at 510 nm) and excellent cycling stability (in film: 78% for total amount and 63% for reduction after 12000 cycles; in device: 85.6% after 3000 cycles) which qualify it for further device fabrications. This study reveals that this polymer (P3) would be a promising high performance red electrochrome and could be a good candidate for flexible and large-scale organic electrochromic devices as well as for smart indicators or display applications.

• 出版日期2018-10-9
• 单位北京大学; 北京大学深圳研究生院