Impedance spectroscopy of organic hetero-layer OLEDs as a probe for charge carrier injection and device degradation

Stefan Nowy; Wei Ren; Julia Wagner; Josef A. Weber; Wolfgang Brütting

doi:10.1117/12.824856

27 August 2009 Impedance spectroscopy of organic hetero-layer OLEDs as a probe for charge carrier injection and device degradation

Stefan Nowy, Wei Ren, Julia Wagner, Josef A. Weber, Wolfgang Brütting

Author Affiliations +

Proceedings Volume 7415, Organic Light Emitting Materials and Devices XIII; 74150G (2009) https://doi.org/10.1117/12.824856
Event: SPIE Photonic Devices + Applications, 2009, San Diego, California, United States

Abstract

Impedance spectroscopy (IS) is a powerful method for characterizing the electrical properties of materials and their interfaces. In this study we use IS to investigate the charge carrier injection properties of different anodes and anode treatments in bottom-emitting organic light-emitting diodes (OLEDs). These are ITO-based (indium tin oxide) hetero-layer devices with TPD (N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4-diamine) as hole transporting layer (HTL) and Alq₃ (tris-(8-hydroxyquinoline) aluminum) as emission and electron transporting layer (EML and ETL, respectively). A detailed analysis of the capacitance as function of frequency and DC bias yields information about trapped and interfacial charges as well as the dynamics of injected charges. Furthermore, we use IS to study degradation processes in OLEDs.

Citation Download Citation

Stefan Nowy, Wei Ren, Julia Wagner, Josef A. Weber, and Wolfgang Brütting "Impedance spectroscopy of organic hetero-layer OLEDs as a probe for charge carrier injection and device degradation", Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74150G (27 August 2009); https://doi.org/10.1117/12.824856

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