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Performance of Injection-Limited Polymer Light-Emitting Diodes

Published online by Cambridge University Press:  01 February 2011

Paul W.M. Blom ,
Teunis van Woudenbergh  and
Hans Huiberts
Paul W.M. Blom
Affiliation:
Materials Science Center and DPI, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
Teunis van Woudenbergh
Affiliation:
Materials Science Center and DPI, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
Hans Huiberts
Affiliation:
Philips Research Laboratories, Professor Holstlaan 4, 5656 AA Eindhoven, The Netherlands
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Abstract

The electro-optical characteristics of a polymer light emitting diode (PLED) with a strongly reduced hole injection have been investigated. The device consists of a poly-p-phenylene vinylene semiconductor with a Ag hole injecting contact, which has an injection barrier of about 1 eV. It is observed that the light and current density of such an injection-limited PLED strongly exceed the expected device characteristics. Numerical calculations of the injection-limited PLED show that the enhanced performance can be explained by a very high electric field at the hole injecting contact, due to trapped electrons.

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