Parameter Analysis of an Organic Light-Emitting Diode (OLED)

The contact resistance, the paralel resistance and the paralel capacitance of an organic light- emiting diode (OLED) were analyzed as a function of voltage. A sinusoidal voltage, a direct current (DC)voltage and a designed voltage were applied to obtain the parameters. The contact resistance was 82 Ω and the parallel resistance of the OLED was found to decrease from 28 M to 5 k as the applied voltage was increased from 2.4 V to 6.8 V. The conduction current only flowed through the device during a period of constant voltage and the displacement and the conduction currents flowed during a period of increasing voltage. The parallel capacitance, obtained by using the displacement current, was about 0.71 nF at voltage below 1.8 V and deceased, after showing a peak value of 0.85 nF at 3.3 V, as the applied voltage was increased. KCI Citation Count: 3