Developing conjugated polymers with broad-band absorption covering visible and near-infrared regions for electrochromism†

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer Chemistry Pub Date : 2025-03-17 DOI:10.1039/d4py01461h

Guoqiang Kuang , Hongbin Yin , Chenming Li , Yijie Tao , Yafei Guo , Shiguo Zhang

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Abstract

Conjugated polymers containing donor (D) and acceptor (A) units exhibit intramolecular charge transfer (ICT), which results in lower bandgaps and facilitates a red shift of the absorption peaks. Utilizing the conjugated backbone structure and ICT mechanisms, several D–A-type polymers were designed and synthesized using thiophene, strong fused-ring thiophene donors (IDT or IDTT), ultrastrong acceptor units (benzobisthiadiazole derivatives (SNT) or benzothiadiazolo[3,4-g]quinoxaline (TQX)), and acceptor benzothiadiazole (TZ) as the building blocks for constructing broad-band absorption electrochromic polymers. The incorporation of SNT (or TQX) units into the polymer chain induces the near-infrared (NIR) modulation, while the combination of TZ units fulfils long-wave visible absorption for synergistic visible and near-infrared modulation of the polymers. Consequently, the synthesized polymers and derived electrochromic devices demonstrate ultra-broad electrochromism from 350 nm to 1000 nm with high optical contrast, swift switching response, and good stability, which show great application potential in smart windows.

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开发覆盖可见光和近红外波段的共轭聚合物用于电致变色

含有给体(D)和受体(A)单元的共轭聚合物具有分子内电荷转移（ICT），并且通常具有较低的带隙，促进吸收峰向红色或近红外（NIR）区域的移动。利用共轭主链结构和ICT机制，以噻吩、强融合环噻吩给体（IDT或IDTT）、超强受体单元（苯并噻唑二唑衍生物（SNT）或苯并噻唑二唑[3,4-g]喹诺啉（TQX））和受体苯并噻唑（TZ）为构建单元，设计合成了几种新型D-A型聚合物，用于构建宽带吸收电致色聚合物。SNT（或TQX）单元加入到聚合物链中诱导近红外调制，而TZ单元的组合实现了聚合物的可见光和近红外（NIR）协同调制的长波可见光吸收。因此，合成的聚合物和衍生的电致变色器件具有350 ~ 1000 nm范围内的超宽电致变色，光学对比度高，开关响应快，稳定性好，在智能窗口中具有很大的应用潜力。

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来源期刊

Polymer Chemistry POLYMER SCIENCE-

CiteScore

8.60

自引率

8.70%

发文量

535

审稿时长

1.7 months

期刊介绍： Polymer Chemistry welcomes submissions in all areas of polymer science that have a strong focus on macromolecular chemistry. Manuscripts may cover a broad range of fields, yet no direct application focus is required.