Interfacial Characteristics of Organic Electroluminescent Devices (OELDs) Using Impedance Technique

Abstract

We studied the effect of bias voltage on the impedance spectra of a double-layered cell. When bias-voltage was applied, bulk resistance was reduced due to the increased number of carriers but total capacitances increased very much due to more polarization at interfaces. When compared with single-layered cell, double-layered cell resulted in the lower turn-on voltage, which may be related to the increased interfacial impedance.