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Proceedings Paper

Influence of charge carrier injection on the device performance of blue organic light-emitting diodes
Author(s): Heike Riel; Horst Vestweber; Walter Riess
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Paper Abstract

Multilayer organic light-emitting diodes with a well-defined emission region are ideal systems to investigate the underlying mechanisms of device operation. In this paper we give a brief overview of our studies on the injection and recombination processes in blue organic light-emitting diodes. Our diodes consist of copper phthalocyanine as the hole- injection/buffer layer, the aromatic diamine N,N'- di(naphthalene-1-yl)-N,N'-diphenyl-benzidine as the hole- transport layer, a distyrylarylene derivative as the emitting layer, tris(8-hydroxy-quinoline)aluminum as the electron- injection/transport layer sandwiched between indium tin oxide (ITO) as the transparent hole injector, and low work-function metals as the electron-injecting electrode. To reveal the limiting mechanisms in device operation we investigated the influence of different anode (ITO, optimized ITO) and cathode materials (Mg:Ag, Ca, LiF/Mg:Ag) as well as different layer thicknesses on the device characteristics. These investigations revealed that the device characteristics in the low and medium voltage range are determined by the injection properties of the electrodes, whereas at higher voltages (i.e. at higher current densities) a transition from an electrode- limited injection to a bulk-limited conduction process is detectable.

Paper Details

Date Published: 17 April 1998
PDF: 8 pages
Proc. SPIE 3281, Polymer Photonic Devices, (17 April 1998); doi: 10.1117/12.305427
Show Author Affiliations
Heike Riel, IBM Zurich Research Lab. (Switzerland)
Horst Vestweber, IBM Zurich Research Lab. (Germany)
Walter Riess, IBM Zurich Research Lab. (Switzerland)

Published in SPIE Proceedings Vol. 3281:
Polymer Photonic Devices
Bernard Kippelen; Donal D. C. Bradley, Editor(s)

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