Optical and Electrical Properties of Electrochromic Devices Depending on Electrolyte Concentrations and Cell Gaps

The optical and electrical properties of electrochromic devices (ECDs) have been studied as a function of the electrolyte concentration and the cell gap. During tests, the electrolyte concentration was adjusted from 0.01 to 1M LiClO4, and the cell gaps between the positive and negative electrodes were set at 25, 60, and 100 mu m. By varying the electrolyte concentrations and the cell gap, various parameters such as the transmittance, response time, charge consumption, coloration efficiency, and bistability of ECD were comparatively analyzed. Viologen (VO) was used as the reduction electrochromic material, and triarylamine (TAA) was used as the oxidation material.