An electrochemically and optically stable electrochromic polymer film based on EDOT and 1,2,3,4-tetrahydrophenazine

• Published in: Organic electronics 2019-12, Vol.75, p.105398, Article 105398
• Main Authors: Cansu Ergun, Emine Gül, Eroglu, Deniz
• Format: Article
• Language: English
• Subjects: Electrochromic device; Electrochromic polymers; Ethylenedioxythiophene; Quinoxaline; Tetrahydrophenazine
• ISSN: 1566-1199; 1878-5530
• DOI: 10.1016/j.orgel.2019.105398

In this work, 3,4-ethylenedioxythiophene (EDOT) and 1,2,3,4-tetrahydrophenazine based donor-acceptor-donor type monomer (EBE) was synthesized, electropolymerized and the resulting polymer film (P(EBE)) was investigated in terms of its electrochemical and spectroelectrochemical properties. The polymer film showed excellent electrochemical stability upon 1000 switchings by saving almost full of its electroactivity. Moreover, 95% of the optical contrast was maintained after 500 switchings. The optical band gap value was calculated using Tauc Plot method and found as 1.5 eV. P(EBE) film revealed multichromic behaviour between its fully neutral and oxidized states; dark cyanish-green at −0.8 V, more green at −0.5 V and transmissive green beyond 0.6 V potentials. Finally, a dual type electrochromic device (ECD) was constructed with P(EBE) and poly(3,4-ethylenedioxythiophene) (PEDOT) films and the spectroelectrochemical behaviour of ECD was depicted. [Display omitted] •A cyclohexyl-quinoxaline and EDOT based electrochromic polymer was synthesized.•Polymer film revealed remarkable electrochemical and optical stability.•Polymer film showed fast switching response.•Polymer is a suitable candidate for electrochromic applications.