Adjusting Correlated Color Temperature from White Light-Emitting Electrochemical Cells by Employing Electrochromic Filters

White light-emitting electrochemical cells (LECs) have drawn great attention due to advantages such as low-voltage operation, compatibility with solution processes and employing inert cathode metals. Since different correlated color temperatures (CCTs) of background illumination are necessary for lighting applications, real-time CCT-tunable white LECs would be desired in modem smart lighting systems. In this work, a widely and dynamically tuning CCT (> 10000 K) of white LEC is demonstrated by employing an electrochromic device (ECD) as a real-time controllable color filter. By adjusting the applied bias on the ECD to attenuate different amount of red emission of white EL, real-time and wide-range CCT tunability can be achieved. Such white light sources are suitable for most lighting applications and modem smart lighting systems.