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Highly Efficient OVPD-Processed Resonant-Cavity OLED Comprising a Semitransparent Ag layer

Published online by Cambridge University Press:  13 February 2012

M. Bösing ,
F. Lindla ,
M. Brast ,
D. Bertram ,
D. Keiper ,
M. Heuken ,
H. Kalisch  and
A. Vescan
M. Bösing
Affiliation:
Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
F. Lindla
Affiliation:
Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
M. Brast
Affiliation:
Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
D. Bertram
Affiliation:
Philips Technologie GmbH, Philipsstr. 8, 52068 Aachen, Germany
D. Keiper
Affiliation:
AIXTRON SE, Kaiserstr. 98, 52134 Herzogenrath, Germany
M. Heuken
Affiliation:
Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany AIXTRON SE, Kaiserstr. 98, 52134 Herzogenrath, Germany
H. Kalisch
Affiliation:
Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
A. Vescan
Affiliation:
Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
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Abstract

The light out-coupling potential of introducing a semitransparent Ag layer between the anode and the organic layer stack of monochrome bottom-emitting organic light emitting diodes (OLED) is examined. Red and green phosphorescent as well as deep-blue fluorescent resonant-cavity OLED (RC-OLED) comprising a semitransparent Ag layer are processed by means of organic vapor phase deposition (OVPD). An enhancement of the luminous efficiency of up to 81% can be observed.

The impressive efficiency enhancement can be explained by a reduced formation of substrate modes in combination with a strong narrowing of the emission spectrum leading to an increased true luminous efficiency.

Keywords

organicluminescenceAg
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1402: Symposium U – Charge Generation/Transport in Organic Semiconductor Materials , 2012 , mrsf11-1402-u13-27
Copyright
Copyright © Materials Research Society 2012

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References

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