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Emission Characteristics of OLEDs on Planar and Non-Planar Substrates

Published online by Cambridge University Press:  15 February 2011

Marcus Scheffel ,
Jan Birnstock ,
Arvid Hunze ,
Ralph Paetzold ,
Lothar Rau ,
Wolfgang Rogler ,
Sven Voegele  and
Albrecht Winnacker
Marcus Scheffel
Affiliation:
Siemens Corporate Technology, CT MM 1, Erlangen, Germany Department of Material Science VI, University of Erlangen-Nuernberg, Erlangen, Germany
Jan Birnstock
Affiliation:
Siemens Corporate Technology, CT MM 1, Erlangen, Germany Department of Material Science VI, University of Erlangen-Nuernberg, Erlangen, Germany
Arvid Hunze
Affiliation:
Siemens Corporate Technology, CT MM 1, Erlangen, Germany Department of Material Science VI, University of Erlangen-Nuernberg, Erlangen, Germany
Ralph Paetzold
Affiliation:
Siemens Corporate Technology, CT MM 1, Erlangen, Germany Department of Material Science VI, University of Erlangen-Nuernberg, Erlangen, Germany
Lothar Rau
Affiliation:
Institute for System Theory and Display Technology, University of Stuttgart, Germany
Wolfgang Rogler
Affiliation:
Siemens Corporate Technology, CT MM 1, Erlangen, Germany
Sven Voegele
Affiliation:
Institute for System Theory and Display Technology, University of Stuttgart, Germany
Albrecht Winnacker
Affiliation:
Department of Material Science VI, University of Erlangen-Nuernberg, Erlangen, Germany
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Abstract

We report on light extraction experiments with polyfluorene based organic light emitting diodes (OLEDs). The intensity distribution of emission within the substrate and within air is determined experimentally. For the devices investigated in this study, we find that the external quantum efficiency can be increased by a factor of 1.82, in the case of complete suppression of waveguiding within the substrate. The experimental data is in good agreement with modeling results based on dipole emission within a multilayer system. As a consequence of these findings, we modified the device topology by introducing light extraction structures between glass substrate and indium tin oxide anode. This results in redirection of photon trajectories and thus in a higher probability to extract waveguided radiation. At a luminance of 100 cd/m2, the photometric efficiency for emission in forward direction is enhanced by a factor of 1.45 to 8.9 cd/A.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 771: Symposium L – Organic and Polymeric Materials and Devices , 2003 , L7.31
Copyright
Copyright © Materials Research Society 2003

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