Plastic Electrochromic Devices: Electrochemical Characterization and Device Operation of PPTZPQ, a Conjugate Polymer with Donor-Acceptor Architecture

F FUNGO, S. A. JENEKHE, AND A. J. BARD

CHEMISTRY OF MATERIALS

AMER CHEMICAL SOC

Año: 2003 vol. 15 p. 1264 - 1272

0897-4756

We describe the morphological, electrochemical, spectroelectrochemical characterization, and electrochromic device properties of films of poly(2,2¢-[10-methyl-3,7-phenothiazylene]- 6,6¢-bis[4-phenylquinoline]) (PPTZPQ). Cyclic voltammograms of PPTZPQ polymer films showed reversible electrochemical oxidation accompanied with a color change that was switchable as a function of the potential. However, the reduction behavior of PPTZPQ was unstable and caused a loss of the electrochromic effect. The spectroelectrochemical behavior of PPTZPQ was interpreted as the combination of the properties of the constituent donor and acceptor moieties. Two PPTZPQ solid-state electrochromic devices were constructed using indium tin oxide (ITO) deposited on polyester and poly(ethylene oxide) as a polymeric electrolyte. The electrochromic active materials were PPTZPQ as the primary electrode and ladder poly(benzobisimidazobenzophenanthroline) (BBL) or vanadium pentoxide (V2O5) as the secondary electrode. The PPTZPQ-BBL and PPTZPQ-V2O5 devices showed black-red and yellow-red color changes, respectively, during potential cycling.