Wang Peng, Qian Chao, Guo Xu, Jiang Chuanyu, Liu Ping
State Key Laboratory of Luminescent Materials and Devices, Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China.
Zhuhai Kaivo Optoelectronic Technology Co., Ltd, Zhuhai 519000, China.
ACS Appl Mater Interfaces. 2024 Jan 17;16(2):2522-2529. doi: 10.1021/acsami.3c16142. Epub 2024 Jan 2.
Viologen and Prussian blue (PB) exhibit good electrochromic properties, but certain limitations still exist. To improve the electrochromic properties of viologen, a viologen derivative 1,1'-bis(4-(bromomethyl)benzyl)-[4,4'-bipyridine]-1,1'-diium hexafluorophosphate (BBDV) was synthesized, and its electrochromic properties were investigated. Additionally, a flexible composite electrochromic device (FC-ECD) was prepared by using BBDV and PB as active materials. The structure of the FC-ECD was PET-ITO/gel electrolyte-BBDV/PB/PET-ITO. The applied voltage required for the FC-ECD was found to be lower than that of the ECD based on BBDV(FBBDV-ECD). Compared to FBBDV-ECD, FC-ECD exhibited a higher optical contrast (71.42%) and cyclic stability (89.51%). The FC-ECD exhibited multicolor changes under different applied voltages (ranging from -2.0 to +1.6 V). Especially, the color of the FC-ECD remained stable for 14 h after the removal of the applied voltage.
紫精和普鲁士蓝（PB）具有良好的电致变色性能，但仍存在一定局限性。为了改善紫精的电致变色性能，合成了一种紫精衍生物1,1'-双（4-（溴甲基）苄基）-[4,4'-联吡啶]-1,1'-二鎓六氟磷酸盐（BBDV），并对其电致变色性能进行了研究。此外，以BBDV和PB作为活性材料制备了一种柔性复合电致变色器件（FC-ECD）。FC-ECD的结构为PET-ITO/凝胶电解质-BBDV/PB/PET-ITO。发现FC-ECD所需的施加电压低于基于BBDV的电致变色器件（FBBDV-ECD）。与FBBDV-ECD相比，FC-ECD表现出更高的光学对比度（71.42%）和循环稳定性（89.51%）。FC-ECD在不同的施加电压（范围为-2.0至+1.6 V）下呈现多色变化。特别是，去除施加电压后，FC-ECD的颜色保持稳定14小时。
