Figure 5

Electrochromic performance of the PEDOT:PSS based ECD cell with G4L as electrode. (a) The optical luminous transmittance responses measured as a function of applied +/− voltages ranging from +0.5 to 3.5 V for T _t and −0.5 to −3.5 V for T _d with an offset voltage of −0.5 V during 40 s, (b) the plotted optical switching time, generally defined as the time to reach 90% of the optical changes in between T _t and T _d , (c) the optical contrast ratio calculated from the luminous transmittance difference, also in between T _t and T _d , (d) the transmittance spectra measured at wavelengths ranging from 300 nm to 800 nm at an applied potential of ±2.5 V for transparent (positive, red line) and for dark (negative, blue line) states and (e) the photo images of the optical changes under the applied bias voltages.