TRANSMISSION SPECTRA OF AN ELECTROCHROMIC WINDOW CONSISTING OF POLYANILINE, PRUSSIAN BLUE AND TUNGSTEN-OXIDE

Energy savings in buildings can be achieved by using electrochromic wi ndows which change colour by the application of an external voltage. W e have studied an electrochromic window by combining polyaniline (PANI ), prussian blue (PB) and tungsten oxide (WO3) with poly(2-acrylamido- 2-methyl-propane-sulphonic acid) (PAMPS) as a solid organic polymer el ectrolyte binding the three electrochromic materials together. Transmi ssion spectra in the 290-3300 nm wavelength region for the window at d ifferent applied potentials were recorded and show good light modulati on. For instance, by applying a voltage between -1800 and +1600 mV, th e transmission changes from 0.76 to 0.11 at 1000 nm. The window is abl e to regulate 49% of the total solar energy.