Stable low-bandgap isoindigo-bisEDOT copolymer with superior electrochromic performance in NIR window
Stable low-bandgap isoindigo-bisEDOT copolymer with superior electrochromic performance in NIR window
复制标题
稳定的低带隙异靛蓝-双EDOT共聚物在近红外窗口中具有优异的电致变色性能
DOI：
10.1016/j.electacta.2021.139418
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发表时间：
2021-10-23
影响因子：
6.6
通讯作者：
Lu, Baoyang
中科院分区：
文献类型：
--
作者：
Gu, Hua;Wang, Kang;Lu, Baoyang
具有高光学对比度、显色效率和优异稳定性的高性能电致变色材料一直是聚合物电致变色的关键，并将推动包括柔性显示器和可穿戴电子产品在内的各种应用。本文中，我们通过合成和电聚合其前体（E）-1，1 ′-二己基-6，6 ′-双（2，2 ′，3，3 ′-四氢-[5，5 ′-联噻吩并[3，4-B][1，4]二恶英]-7-基）-[3，3 ′-联二氢吲哚亚基]-2，2 ′-二酮（BisE-IDOH-BisE），从强吸电子受体单元异靛和给电子部分bisEDOT开发了给体-受体-给体型共聚物。这种聚合物表现出1.02 eV的低光学带隙，具有稳定的和可逆的电致变色从凯利绿到天蓝色。进一步的动力学研究表明，该聚合物在整个近红外窗口显示出令人感兴趣的整体电致变色性能，同时具有高达90%的高光学对比度、1025 cm（2）C-1的高显色效率、1.1 s的快速切换时间和优异的可逆稳定性（在5000次循环时损失< 4%），其呈现出迄今为止报道的电致变色聚合物中最好的总体性能之一。凭借这些惊人的电致变色性能，基于异靛蓝-EDOT的聚合物可以进一步发展为器件图案化和真实的应用，如柔性室内装饰显示器和近红外伪装。(C)2021爱思唯尔有限公司版权所有。
High-performance electrochromic materials with high optical contrast, coloration efficiency, and excellent stability have always been critical for polymer electrochromics, and will boost diverse applications including flexible displays and wearable electronics. Herein, we develop a donor-acceptor-donor type copolymer from strong electron-withdrawing acceptor unit isoindigo and electron-donating moiety bisEDOT by synthesizing and electropolymerizing its precursor (E)-1,1'-dihexyl-6,6'-bis(2,2',3,3'-tetrahydro-[5,5'-bithieno[3,4-b][1,4]dioxin]-7-yl)-[3,3'-biindolinylidene]-2,2' -dione (BisE -IDOH -BisE). Such polymer exhibits a low optical bandgap of 1.02 eV with stable and reversible electrochromism from kelly-green to sky blue. Further kinetic studies demonstrate that this polymer displays intriguing overall electrochromic performances throughout the NIR window with simultaneously high optical contrast up to 90%, high coloration efficiency of 1025 cm(2) C-1, fast switching time of 1.1 s, and excellent reversible stability (< 4% loss upon 50 0 0 cycling), which presents one of the best overall performances among the reported electrochromic polymers so far. With these amazing electrochromic properties, isoindigo-EDOT based polymers can be further developed towards device patterning and real applications like flexible indoor decoration displays and near infrared camouflage. (C) 2021 Elsevier Ltd. All rights reserved.