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Comprehensive efficiency analysis of organic light emitting devices

: Setz, D.S.; Schmidt, T.D.; Flämmich, M.; Nowy, S.; Frischeisen, J.; Krummacher, B.C.; Dobbertin, T.; Heuser, K.; Michaelis, D.; Danz, N.; Brütting, W.; Winnacker, A.


Journal of photonics for energy. Online journal 1 (2011), No.1, Art. 011006, 13 pp.
ISSN: 1947-7988
Journal Article
Fraunhofer IOF ()
organic light emitting diode; internal luminescence quantum efficiency

We focus on the determination of the internal luminescence quantum efficiency of a green-emitting organic light-emitting diode (OLED). By considering different geometrical configurations of OLED thin-film stacks, we elucidate the role of the internal luminescence quantum efficiency of the emitter in the thin-film microcavity. Combining optical simulations with experimental results, a comprehensive efficiency analysis is performed. Here the electroluminescence of a set of OLEDs is characterized. Additionally, the devices are characterized using time-resolved photoluminescence measurements. The experimental data are analyzed using optical simulations. This analysis leads to a quantification of internal luminescence quantum efficiency and allows conclusions about competing mechanisms resulting in nonradiative recombination of charge carriers.