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  4. Conditions of recombination zone splitting in organic light-emitting diodes
 
conference paper

Conditions of recombination zone splitting in organic light-emitting diodes

Berner, D.  
•
Nüesch, F.  
•
Tutis, E.
Show more
2004
Organic Optoelectronics and Photonics

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

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Type
conference paper
DOI
10.1117/12.545665
Author(s)
Berner, D.  
Nüesch, F.  
Tutis, E.
Ma, C.
Wang, X.
Zhang, B.
Zuppiroli, L.  
Date Issued

2004

Publisher

SPIE-Int. Soc. Opt. Eng

Published in
Organic Optoelectronics and Photonics
Series title/Series vol.

Proceedings of the SPIE - The International Society for Optical Engineering; 5464

Start page

72

End page

82

Subjects

dyes

•

optical multilayers

•

organic light emitting diodes

•

recombination zone splitting

•

organic light-emitting diode

•

multilayer organic light emitting device

•

OLED

•

partially doped emission layer

•

MOLED device model

•

radiative charge recombination distribution

•

yellow emitting laser dye

•

electron trapping capability

•

quantum efficiency

•

color saturation

•

blue-shift

Note

CFG S.A. Microelectron., Morges, Switzerland

8295674

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

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Available on Infoscience
April 3, 2007
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/4222
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