Electrochromic device with a polymer ionic conductor

The optical and electrochromic properties of tungsten oxide films deposited by e-beam evaporation were investigated. A laminated structure device was prepared. The as-deposited tungsten oxide film was used as the electrochromic film. A solid polymer electrolyte PPG- PMMA-LiClO4 was used as an ionic conductor. Spectrophotometric measurements show that the luminous transmittance of the device can be modulated between about 60% and 15%.