Regensburg 2007 – wissenschaftliches Programm

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

SYOE 8: Poster Session SYOE

SYOE 8.73: Poster

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

Simulation of Light Extraction from OLEDs — •Nils A. Reinke, Michael Hutzel, Christian Bergner, Stefan Nowy, and Wolfgang Brütting — University of Augsburg, Institute of Physics, Experimental Physics, Augsburg, Germany

Light extraction from organic light emitting devices is dominated by two optical effects, a) wide angle interference and b) multiple beam interference. In a) directly radiated light interferes with the reflection on the metallic electrode and leads to light emission, which is strongly dependent on the position of the emitting dipole layer. In b) light is reflected back and forth between two reflecting layers. In this study emission spectra were calculated by two different simulation techniques: a so-called dipole approach and an absorption model. For the former, radiant molecules are treated as oscillating dipole antennae. This classical approach allows calculating the far field radiation of these dipoles. The absorption model [1] presumes that the same pathway taken by the radiation from an external light source to couple into leaky modes is used by photons generated inside the organic multilayer structure to leave the device. The emission spectrum of an OLED is then given by the product of the spectral distribution of the generated photons times the probability of the photons to leave the device as leaky modes. The applicability of these two models was verified for two different types of OLEDs. The first type comprising one transparent electrode for which wide angle interference is dominant and the second including two reflective electrodes for which multiple beam interference is more important. [1] N. A. Reinke et. al, Opt. Comm, 2667 (2006) 191-197