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Updated: Mar 25, 2026

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
Published on: November 16, 2018
Charge injection and transport properties of an organic light-emitting diode
Peter Juhasz1, Juraj Nevrela1, Michal Micjan1
1Slovak University of Technology, Ilkovicova 3, Bratislava 81219, Slovakia.
Abstract:
The charge behavior of organic light emitting diode (OLED) is investigated by steady-state current-voltage technique and impedance spectroscopy at various temperatures to obtain activation energies of charge injection and transport processes. Good agreement of activation energies obtained by steady-state and frequency-domain was used to analyze their contributions to the charge injection and transport. We concluded that charge is injected into the OLED device mostly through the interfacial states at low voltage region, whereas the thermionic injection dominates in the high voltage region. This comparison of experimental techniques demonstrates their capabilities of identification of major bottleneck of charge injection and transport.
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