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Proceedings Paper

Conditions of recombination zone splitting in organic light-emitting diodes
Author(s): Detlef F. Berner; Frank Nuesch; Eduard Tutis; Changqi Ma; Xuesong Wang; Baowen Zhang; Libero Zuppiroli
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Paper Abstract

We present a theoretical and experimental study of a multilayer organic light emitting device (OLED) with a partially doped emission layer. An extended version of our established "MOLED" device model is used to understand the effects of the partially doped layer on the transport behavior and on the radiative charge recombination distribution as a function of applied bias. A step by step discussion of the possible mechanisms that can be introduced by doping and the resulting changes on the device properties is presented. We have found that under certain conditions the recombination zone is split into two zones leading to an emission color change with increasing voltage. By using the yellow emitting laser dye derivative 4-(dicyanomethylene)-2-methyl-6-{2-[(4-diphenylaminophenyl]ethyl}-4H-pyran (DCM-TPA) with electron trapping capabilities as a dopant in a standard organic light emitting device, we have achieved high quantum efficiency with excellent color saturation. Furthermore, for this special case a blue-shift of the emission color is observed for increasing bias due to the appearance of a double peak structure of the recombination zone.

Paper Details

Date Published: 8 September 2004
PDF: 11 pages
Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004); doi: 10.1117/12.545665
Show Author Affiliations
Detlef F. Berner, CFG S.A. Microelectronic (Switzerland)
Frank Nuesch, Ecole Polytechnique Federale de Lausanne (Switzerland)
Eduard Tutis, Technical Institute of Physics and Chemistry (China)
Changqi Ma, Institute of Physics (Croatia)
Xuesong Wang, Technical Institute of Physics and Chemistry (China)
Baowen Zhang, Technical Institute of Physics and Chemistry (China)
Libero Zuppiroli, Ecole Polytechnique Federale de Lausanne (Switzerland)

Published in SPIE Proceedings Vol. 5464:
Organic Optoelectronics and Photonics
Paul L. Heremans; Michele Muccini; Hans Hofstraat, Editor(s)

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