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White Light Emitting Electroluminescence Devices with Organic Oligomers

Published online by Cambridge University Press:  10 February 2011

F. Meghdadi ,
S. Tasch ,
W. Graupner ,
S.E. Döttinger ,
M. Hanack ,
M. Graupner ,
A. Hermetter  and
G. Leising
F. Meghdadi
Affiliation:
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz,Austria
S. Tasch
Affiliation:
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz,Austria
W. Graupner
Affiliation:
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz,Austria
S.E. Döttinger
Affiliation:
Institut für Organische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, Germany
M. Hanack
Affiliation:
Institut für Organische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, Germany
M. Graupner
Affiliation:
Institut für Biochemie und Lebensmittelchemie, Technische Universität Graz, Graz, Austria
A. Hermetter
Affiliation:
Institut für Biochemie und Lebensmittelchemie, Technische Universität Graz, Graz, Austria
G. Leising
Affiliation:
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz,Austria
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Abstract

We report on the properties of white light emitting electroluminescence (EL) devices fabricated by combining blue and orange light emitting organic materials, parahexaphenyl (PHP) and a new isothianaphthen-S-oxide (ITSO) oligomer. The EL spectrum of this oligomer blend covers the range from 400 to 650 nm. When the concentration ratios of these materials are suitably adjusted a pure white light emission (CIE coordinates of x=0.333 and y= 0.338) and a high external EL quantum efficiency of 1.2% photons/electron can be obtained. The mechanism of the white light generation is ascribed to an internal self-absorption of part of the blue PHP light emission by ITSO and a subsequent photoluminescence emission process of ITSO. The results of photoinduced absorption, which is sensitive to charged species and triplet states of these guest-host systems, are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 27
Copyright
Copyright © Materials Research Society 1998

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