P‐163: The Optimization of Various Range Voltage in OLED According to Energy Level And Mobility Respectively

In order to well understand the detailed influence factors of the voltage in OLED, we studied the various voltage range in device with different interface energy gap and different material mobility by using current‐ voltage‐ luminance (IVL), impedance spectroscopy (IS) and current‐capacitance(CV). The result shows conversion voltage from ohmic current to trap current(below2V) and the carrier recombination voltage(2~3V) are both decided by interface energy gap, and the high voltalge range(>3V), the energy gap effect trail off and almost disappear. So the mobility is the primary determinant for operation voltage, and impedance spectroscopy (IS) is used to demonstrate the mechanism. Totally, for the sake of guaranteeing the same variation trend of various gray level in panel, the RGB voltage should be optimized in various range by energy gap and mobility respectively.