To use in electrochromic displays and devices, the material used in the active layer should have high VX-765 changes, low response time (in order of a few seconds), and high stability during the electrochromic switching . The change in optical transmission of the ECD was recorded at λmax (650 nm), while switching the potential between −0.9 and 1.5 V, with a residence time of 5 s. The oxidation and reduction response times of poly-(PC)/PEDOT device are 0.5 and 0.4 s, respectively. Additionally, optical contrast of this device at 650 nm (ΔT%) was found to be 28%. Optical activity loss of the device was found to be 8% even after 5000 cycles ( Fig. 8). Finally, these results indicate that the constructed device has a low response time (ca. only 0.5 s), high redox stability, and high coloration efficiency (981 cm2 C−1). In previous studies, the coloration process of carbazole-based materials used in electrochromic device was completed at more than 2 V  and . This device with low driving voltage between −0.9 and 1.5 V has great advantages when compared to other carbazole-based electrochromic materials. Neutral state colorless polymers are also important in electrochromic applications such as smart windows. To obtain a colorless system, these materials do not need any potential or energy. This property of poly-PC indicates that bursae would be a good promising material for the construction and/or the development of neutral state colorless smart windows.