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Impedance Spectroscopy and Evolution of the Equivalent Electrical Circuit Model for Large Area Organic Light Emitting Diodes Aged Under Stress

In this work, a large area white organic light emitting diode (commercial product), aged under electrical stress of 15mA/cm2, has been characterized by means of impedance spectroscopy. An equivalent electrical circuit model, based on the impedance response of the device, is proposed. This model consists of a resistance Rs in series with two modules, which consists of a resistance Rp (Rp l, Rp2) and a capacitance Cp (Cp1, Cp2) in parallel. The proposed model fit well the impedance data both before and after degradation. The values of the resistances Rs, Rpl, Rp2 have increased over aging time, whereas the values of the capacitances Cp1, Cp2 have decreased.