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OLED design: Combined micro- and nano-photonics modeling and routes to a complex optimization algorithm

: Danz, N.; Michaelis, D.; Wächter, C.


Armitage, J. ; Canadian Photonics Consortium -CPC-; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Photonics North 2007 : 4 - 7 June 2007, Ottawa, Ontario, Canada
Bellingham, WA: SPIE, 2007 (Proceedings of SPIE 6796)
ISBN: 978-0-8194-6962-5
ISSN: 0277-786X
Paper 67963F
Conference "Photonics North" <2007, Ottawa>
Fraunhofer IOF ()
organic light emitting diode; waveguide mode; light extraction; Green's function; rigorous coupled wave analysis; ray tracing; micro lens array

The efficiency of organic light emitting diodes is known to be optically limited by different light trapping effects within the device structure. Several approaches have been suggested to enhance the transfer of radiation generated within the device into free space radiation. These approaches include nanoscale wave optical effects to optimize the stratified active media or to diffract guided modes travelling within the active system, as well as refractive or scattering elements to derange total internal reflection within the substrate. This paper deals with substrate emitting devices, where nano- or microscale structures enforce a "recycling" of light that originally would have been trapped within the system. An approach enabling for a combined treatment of ray-optical and thin-film-optimization is introduced and applied to the optimization of an example system. The results indicate an improved system design due to that complex optimization.