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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 8: Poster Session SYOE

SYOE 8.64: Poster

Dienstag, 27. März 2007, 18:00–20:00, Poster B

Infrared Light from organic light emitting diodes — •Thomas Rosenow, Karsten Walzer, and Karl Leo — Institut für Angewandte Photophysik, TU Dresden, D-01062 Dresden, Deutschland

Organic light emitting diodes for the visible part of the electromagnetic spectrum have recently achieved excellent performance and have stimulated work on devices emitting in the near infrared. We demonstrate such near-infrared organic light-emitting diodes (NIR-OLEDs) containing copper, palladium, and platinum phthalocyanine as emitting materials. These NIR-OLEDs exhibit electroluminescence at 1095 nm, 1025 nm and 966 nm. Low driving voltages are achieved by using electrically doped transport layers. A yellow singlet emitter serves as host for the emitting materials and improves the energy transfer to the emitter. Using this approach, the external quantum efficiency is increased up to 0.1 % at room-temperature. Furthermore, light-output at a voltage of 3 V and a current density of 20 mA/cm^2 are observed.