Abstract
In this thesis, we hope multilayer PLED which used easy spin coating continuous color tuning. Due to the stronger field dependence of the electron mobility relative to the hole mobility, the distribution of the most excitons is pushed away from the cathode as the voltage increases. The concentration of excitons near the anode increases higher than the cathode. By this way, we can have red color in low voltage, and have strong blue color relative to other color.