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Extracting the emitter orientation in organic light-emitting diodes from external quantum efficiency measurements

: Schmidt, Tobias D.; Reichardt, Lukas J.; Rausch, Andreas F.; Wehrmeister, Sebastian; Scholz, Bert J.; Mayr, Christian; Wehlus, Thomas; Ciarnáin, Rossá Mac; Danz, Norbert; Reusch, Thilo C.G.; Brütting, Wolfgang


Applied Physics Letters 105 (2014), No.4, Art. 043302, 5 pp.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
Journal Article
Fraunhofer IOF ()
dye-doped; emission pattern; emitting system; external quantum efficiency; future applications; measurements of straight-forward method; transition dipole moments

Emitter orientation will play a major role in future applications of organic light-emitting diodes due to its strong impact on the efficiency of the devices. Up to now, determining the orientation of transition dipole moments required elaborate angular-dependent measurements of the light emission pattern. In this paper, we present a simplified and straightforward method to extract the emitter orientation from external quantum efficiency measurements. We demonstrate the validity of the method on three different dye-doped emitting systems.