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SYOH: Organische Halbleiter

SYOH III: HV III

SYOH III.1: Hauptvortrag

Montag, 11. März 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.