Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,
DS 29.23: Poster
Wednesday, March 24, 2010, 15:00–17:30, Poster A
Simulation of outcoupling efficiencies of OLEDs — •Richard Pfeifer1, Beatrice Beyer1, Karsten Fehse1, and Karl Leo1,2 — 1Fraunhofer IPMS, Dresden, Germany — 2Institut für Angewandte Photophysik, TU Dresden Germany
Organic light-emitting diodes (OLEDs) are now commercially available in various lighting and display applications. While their electrical and optical properties have been greatly improved by the use of pin-OLEDs, the external quantum efficiency is still limited by the relative low outcoupling efficiency of the generated radiation of 20-25%. To address this field of light outcoupling improvement, we use a simulation based on the freely available open-source-framework CAMFR [1] to calculate the optical properties of planar top-emitting-OLEDs, i.e their angle dependent spectra and the total outcoupling efficiency and compare our results to experimental data. The simulation focus is put on the power distribution of the radiating dipoles into different decay channels as outcoupling modes, guided modes, surface-plasmon modes, and absorption losses. Calculation of these relative contributions enables us to identify the main loss channels of radiated power. Together with the potential of the CAMFR-framework to calculate multilayer systems with periodically structured layers, the optimization of light-outcoupling by integration of diffractive periodic structures is discussed.
[1] P. Bienstman, R. Baets, Optical and Quantum Electronics, 33, p.327-341 (2001)