Admittance spectroscopic characteristics and equivalent circuit modeling of small molecule-based organic light emitting diodes

Abstract

Admittance or impedance spectroscopy is one of the powerful tools to study the equivalent circuit models and the dielectric relaxation processes in organic and inorganic materials and devices. The frequency-dependent properties of small molecule-based organic light emitting diodes have been studied. The single-layer diodes can be modeled as a simple parallel resistor-capacitor circuit. The equivalent circuit models of double-layer devices, for which the single-layer device model is expanded and the interface properties between the organic layers are included, are suggested.