Novel viologen derivatives for electrochromic ion gels showing a green-colored state with improved stability

Hwan Oh, Dong Gyu Seo, Tae Yong Yun, Seong Been Lee, Hong Chul Moon

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)490-495
Number of pages6
JournalOrganic Electronics
Volume51
DOIs
StatePublished - Dec 2017

Keywords

  • Electrochemical display
  • Electrochromism
  • Ion gel
  • Viologen
  • Zincke reaction

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