In this study, a novel conjugated polymer, denoted as ECPblack, is synthesized. ECPblack demonstrated a unique electrochromic behavior with an ultrahigh contrast ratio (over 80%) in most of the visible regions, boasting an ultrahigh integrated contrast ratio of 71.8% between 380 nm and 880 nm. The long conjugated pendant group (pyrene) in ECPblack enhances the absorption in the blue region in its second oxidized state and results in transmissive-to-black electrochromic switching between the neutral state and the oxidized state. The transmissive-to-black electrochromic switching polymer with an ultrahigh contrast ratio could be especially attractive for applications in electronic displays. In addition, when polytriarylamine/nanotube (SWNT/P2) dispersion is doped in ECPblack, the response time of its electrochemical and electrochromic behaviors is further reduced. The electrochromic switching and bleaching time of SWNT/P2/ECPblack decreased by 73% and 80%, respectively. The improvement is caused by the phase separation of the rigid SWNT and the flexible polymer, which generates a rough surface morphology and provides more pathways for faster diffusion of counterions (ClO₄⁻). The polymer/SWNT doping technique provides a simple way to accelerate ion diffusion in anodically coloring materials.

中文翻译：

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从长共轭侧基和高度分散的聚合物/ SWNT到黑色的透射到黑色快速电致变色切换†

在这项研究中，合成了一种新型的共轭聚合物，称为ECPblack。ECPblack表现出独特的电致变色行为，在大多数可见区域中具有超高对比度（超过80％），在380 nm至880 nm之间具有71.8％的超高集成对比度。ECPblack中的长共轭侧基（py）在其第二氧化态下增强了蓝色区域的吸收，并导致在中性态和氧化态之间由透射型转换为黑色，电致变色。具有超高对比度的透射至黑色电致变色开关聚合物对于电子显示器中的应用可能特别有吸引力。另外，当聚三芳基胺/纳米管（SWNT / P2）在ECPblack中掺杂了分散体，进一步降低了其电化学和电致变色行为的响应时间。SWNT / P2 / ECPblack的电致变色切换和漂白时间分别减少了73％和80％。改进由刚性SWNT的相分离和柔性聚合物，其产生粗糙的表面形态，并提供抗衡离子的更快的扩散更途径（CLO引起₄ ^- ）。聚合物/ SWNT掺杂技术提供了一种简单的方法来加速阳极着色材料中的离子扩散。