Journal
ORGANIC ELECTRONICS
Volume 51, Issue -, Pages 490-495Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2017.10.001
Keywords
Electrochromism; Ion gel; Viologen; Zincke reaction; Electrochemical display
Funding
- National Research Foundation of Korea (NRF) grant - Korea government (MSIT) [NRF-2016R1C1B2006296]
- X-mind Corps program of National Research Foundation of Korea (NRF) - Ministry of Science, ICT [NRF-2017H1D8A1030582]
- National Research Foundation of Korea [2016R1C1B2006296] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We successfully synthesized a novel viologen derivative (1,1'-bis(3-fluoro-4-(trifluoromethyl) phenyl)-4,4'-bipyridinium bis(trifluoromethylsulfonyl) imide, TFMFPhV(TFSI) 2) exhibiting a green-colored state. We selected cyanophenyl viologen (CNPhV2+), a conventional electrochromic (EC) chromophore with a green color indication, to compare EC performance. Ion gels consisting of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([EMI][TFSI]) were employed as a solid-state electrolyte for EC devices (ECDs). In comparison to CNPhV2+-containing devices, the ECDs with TFMFPhV2+ showed higher transmittance contrast, larger coloration efficiency, faster coloration and bleaching responses, and better coloration/bleaching operational stability. Cyclic voltammetry revealed that the more stable redox behavior of TFMFPhV2+ is the origin of the outstanding ECD performance.
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