Transmissive-to-black fast electrochromic switching from a long conjugated pendant group and a highly dispersed polymer/SWNT
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
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AbstractIn 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.
CitationZhang Q, Tsai C-Y, Abidin T, Jiang J-C, Shie W-R, et al. (2018) Transmissive-to-black fast electrochromic switching from a long conjugated pendant group and a highly dispersed polymer/SWNT. Polymer Chemistry 9: 619–626. Available: http://dx.doi.org/10.1039/c7py01863k.
SponsorsWe acknowledge the financial support of the Ministry of Science and Technology, Taiwan. We would like to thank Dr Prof. Yap Seong Shan's (Multimedia University, MMU - Cyberjaya Campus: Selangor, Malaysia) help to proofread the manuscript. We also thank Dr Prof. Bing-Joe Hwang's (National Taiwan University of Science and Technology, NTUST) for the electrochemical impedance spectroscopy measurement in this work.
PublisherRoyal Society of Chemistry (RSC)