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Introduction of Innovative Dopant Concentration Profiles to Broaden the Recombination Zone of Phosphorescent OVPD-Processed Organic Light Emitting Diodes

Published online by Cambridge University Press:  31 January 2011

Manuel Bösing ,
Christoph Zimmermann ,
Florian Lindla ,
Frank Jessen ,
Philipp van Gemmern ,
Dietrich Bertram ,
Nico Meyer ,
Dietmar Keiper ,
M. Heuken  and
Holger Kalisch
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Manuel Bösing
Affiliation:
bosingm@gan.rwth-aachen.de, RWTH Aachen University, Chair of Electromagnetic Theory, Aachen, Germany
Christoph Zimmermann
Affiliation:
zimmermann@gan.rwth-aachen.de, RWTH Aachen University, Chair of Electromagnetic Theory, Aachen, Germany
Florian Lindla
Affiliation:
florian.lindla@rwth-aachen.de, RWTH Aachen University, Chair of Electromagnetic Theory, Aachen, Germany
Frank Jessen
Affiliation:
fj@ithe.rwth-aachen.de, United States
Philipp van Gemmern
Affiliation:
philipp.van.gemmern@philips.com, Philips Technologie GmbH, Aachen, Germany
Dietrich Bertram
Affiliation:
dietrich.bertram@philips.com, United States
Nico Meyer
Affiliation:
n.meyer@aixtron.com, AIXTRON AG, Aachen, Germany
Dietmar Keiper
Affiliation:
d.keiper@aixtron.com, United States
M. Heuken
Affiliation:
m.heuken@aixtron.com, United States
Holger Kalisch
Affiliation:
kalisch@ithe.rwth-aachen.de, United States
Rolf H. Jansen
Affiliation:
rhj@ithe.rwth-aachen.de, United States
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Abstract

OLED with non-constant dopant concentration profiles have been processed by means of organic vapour phase deposition (OVPD) and were compared with regard to their luminous current efficiencies. Especially when driven at ultra-high luminance (>10,000 cd/A), OLED with a dopant concentration profile starting with a rather high dopant concentration on the anode side of the emissive layer showed improved luminous current efficiencies compared to their conventional counterparts.

To further investigate this effect, the width and location of the recombination zone have been simulated for all investigated concentration profiles by numerical solution of the semiconductor device equations using experimentally determined doping-dependent charge carrier mobilities. The obtained theoretical results are discussed with regard to the accomplished experiments.

Keywords

devicesoptoelectronicorganic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1154: Symposium B – Concepts in Molecular and Organic Electronics , 2009 , 1154-B11-05
Copyright
Copyright © Materials Research Society 2009

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References

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