A fast switching, low band gap, p- and n-dopable, donor-acceptor type polymer


Gunbas G. E. , ÇAMURLU P., Akhmedov I. M. , TANYELİ C. , ÖNAL A. M. , Toppare L.

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, cilt.615, ss.75-83, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 615 Konu: 1
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.jelechem.2007.11.035
  • Dergi Adı: JOURNAL OF ELECTROANALYTICAL CHEMISTRY
  • Sayfa Sayıları: ss.75-83

Özet

A new electrochromic polymer, poly(2,3-diplienyl-5,7-bis(3,4-ethylenedioxy-2-thienyl)thieno[3,4-b]pyrazine) (PGS) is electrochemically synthesized and its electrochromic properties are reported. PGS showed well defined electrochemical characteristics with a relatively low oxidation potential of 0. 18 V vs Ag/Ag+. Polymer also exhibited a definite redox couple at applied cathodic potentials, indicating n-doping characteristic of the polymer. Spectroelectrochemistry and previously unattempted technique, ESR data was utilized to confirm the existence of dual type pi-pi* transitions centered at 522 nm and 1062 nm. The polymer exhibits multi-color electrochromism where three distinct colors are achievable by varying the redox state of the polymer between saturated red-purple color, blue and colorless-gray in neutral, n- and p-doped states, respectively. Copolymerization as a facile method to tune the electrochromic properties of the material was also realized in the presence of 2,2'-bis(3,4-ethylenedioxythiophene) (BiEDOT). Both polymers exhibit very short switching time (0.4 s) and express more than 45% change in the transmittance in the near-IR region, which could make these polymers useful in applications in NIR electrochromic devices. (c) 2007 Elsevier B.V. All rights reserved.