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Proceedings Paper

Impedance spectroscopy of organic hetero-layer OLEDs as a probe for charge carrier injection and device degradation
Author(s): Stefan Nowy; Wei Ren; Julia Wagner; Josef A. Weber; Wolfgang Brütting
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Paper 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.

Paper Details

Date Published: 27 August 2009
PDF: 12 pages
Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74150G (27 August 2009); doi: 10.1117/12.824856
Show Author Affiliations
Stefan Nowy, Univ. Augsburg (Germany)
Wei Ren, Univ. Augsburg (Germany)
Julia Wagner, Univ. Augsburg (Germany)
Josef A. Weber, Univ. Augsburg (Germany)
Wolfgang Brütting, Univ. Augsburg (Germany)

Published in SPIE Proceedings Vol. 7415:
Organic Light Emitting Materials and Devices XIII
Franky So; Chihaya Adachi, Editor(s)

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