Abstract
Electrochromic display devices have been fabricated using Polydiallyldimethylammonium dihydrogenphosphate $(PAMA^+ H_2PO_4^-)$ blended with $H_3PO_4$ as the electrolyte and $WO_3$ as the electrochromic film. The $WO_3$ deposited glass electrodes were doped with protons to form $H_xWO_3$ in which color depends on the charge density (CD) ranging from 0.01 to 0.04 C/$cm^2$. Proton conducting films of $PAMA^+ H_2PO_4^-$ 2$H_3PO_4$ (2 moles of acid per polymer repeat unit) were sandwiched between two electrodes to obtain the following symmetric configuration: Glass/ITO/$WO_3$/$H^+$ -electrolyte film/$H_xWO_3$ /ITO/Glass. Prior to construction of the electrochromic windows, the electrochemical stability of polymer/acid blends was determined via cyclic voltammetry (CV).