Switchable electrochromic devices based on disubstituted bipyridinium derivatives

Noémi Jordão, Hugo Gonçalo da Silva Cruz, Aida Branco, Carlos Pinheiro, Fernando Pina, Luís C. Branco

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Gel switchable electrochromic devices based on disubstituted bipyridinium derivatives have been developed. The type of substituent from the 4,4′-bipyridinium cation and counter-ions can influence the reversibility and switching of colours of these electrochromic systems. Three switching colours (yellow, blue and red or violet) can be obtained for iodide salts due to dimer formation. In the case of bistrifluoromethanesulfonylimide [NTf2] salts only two reversible colour switches (transparent and blue) were observed. Complementary electrochromic performance including chromatic contrast (ΔT%); transition times between the bleached and coloured states; colouration efficiencies (CE), colour coordinates (CIE L∗a∗b∗) and preliminary cycling stability studies of the devices have been performed. The higher coloration efficiency is observed in the case of [(C10)2bpy][NTf2]2 (186.9 cm2 C-1), which is similar to other bipyridinium systems already reported in the literature.

Original languageEnglish
Pages (from-to)27867-27873
Number of pages7
JournalRCS Advances
Volume5
Issue number35
DOIs
Publication statusPublished - 9 Mar 2015

Keywords

  • Color
  • Electrochromic devices
  • Salts
  • IONIC LIQUIDS
  • OPTICAL ATTENUATOR
  • VIOLOGEN
  • NANOPARTICLES
  • DIMERIZATION
  • FILMS

Fingerprint

Dive into the research topics of 'Switchable electrochromic devices based on disubstituted bipyridinium derivatives'. Together they form a unique fingerprint.

Cite this