Regensburg 2002 – scientific programme
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SYOH: Organische Halbleiter
SYOH III: HV III
SYOH III.1: Invited Talk
Monday, March 11, 2002, 14:00–14:40, H37
Charge injection in polymer light-emitting diodes — •Paul Blom1, Teunis van Woudenbergh1, and Hans Huiberts2 — 1Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands — 2Philips Research, Professor Holstlaan 4, 5656 AA Eindhoven, The Netherlands
Injection-limited hole currents from Ag into poly(p-phenylene vinylene) exhibit a strongly reduced temperature dependence. This is explained by an injection model which is based on hopping from the electrode into the localized states of PPV. The device characteristics of PPV based light-emitting diodes with an injection limited hole contact have been studied. It is demonstrated that the generated current and light-output strongly exceed the predictions based on the limited hole injection. This performance enhancement is explained by interface traps which increase the electric field and resulting injection efficiency at the injection limited hole contact.