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HL: Fachverband Halbleiterphysik

HL 86: Organic electronics and photovoltaics V (CPP, jointly with HL, O)

HL 86.6: Vortrag

Donnerstag, 14. März 2013, 16:30–16:45, H34

Degradation induced decrease of the radiative quantum efficiency in organic light-emitting diodes — •Tobias D. Schmidt¹, Daniel S. Setz², Michael Flämmich³, Bert J. Scholz¹, Arndt Jaeger², Carola Diez², Dirk Michaelis³, Norbert Danz³, and Wolfgang Brütting¹ — ¹Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — ²OSRAM Opto Semiconductors GmbH, Leibnizstrasse 4, 93055 Regensburg, Germany — ³Fraunhofer Institute for Applied Optics and Precision Engineering, 07745 Jena, Germany

The efficiency decrease during electrical operation of organic light-emitting diodes is a crucial issue for both applied and fundamental research. In order to investigate degradation processes, we have performed an efficiency analysis for phosphorescent state-of-the-art devices in the pristine state and after an accelerated aging process at high current density resulting in a luminance drop to less than 60 % of the initial value. This loss in efficiency can be explained by a decrease of the radiative quantum efficiency of the light-emitting guest/host system from 70 % to 40 %, while other factors determining the efficiency are not affected.