An investigation on the performance of Di-isopropyl benzyl derivative of Poly (3, 4-propylene dioxythiophene) thin film based electrochromic pixels displays

Electrochromic (EC) smart pixel display was designed and fabricated using a novel monomer di-4-isopropyl benzyl substituted (3, 4-propylene dioxythiophene) (ProDOT-IPBz2). The polymer thin film showed absorption between 450 and 650 nm at a fully reduced state. The absorption peak narrowed down slightly towards longer wavelength region (850-900 nm) at the oxidation states. Siju et al has reported the coloration efficiency (CE) of the thin film as ∼305 cm2C−1. The ProDot-IPBZ2 thin film was used to fabricate EC pixel display of 2 × 2 pixel array on a patterned ITO coated glass. The optical color contrast of the EC pixel display is 40% at 600 nm, with a switching time of about 2 s and 2.5 s respectively. The CE of EC pixel was found to be 555 cm2C−1 at 600 nm in the fully doped state. This EC pixel switched for more than 1000 cycles with good color contrast (