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Investigation of a Novel Light-blue-emitting Fluorescent Guest/Host System with Excellent Lifetime

Published online by Cambridge University Press:  01 February 2011

Philipp van Gemmern ,
Stefan P. Grabowski ,
Herbert Boerner ,
Volker van Elsbergen ,
Hans-Peter Löbl ,
Edward Young ,
Holger Heil ,
Rocco Fortte ,
Heinrich Becker  and
Michael Heuken
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Philipp van Gemmern
Affiliation:
pvg@gan.rwth-aachen.de, RWTH Aachen, Institut für Theoretische Elektrotechnik, Kopernikusstrasse 16, Aachen, NRW, 52074, Germany
Stefan P. Grabowski
Affiliation:
stefan.grabowski@philips.com, Philips Research Laboratories, Weisshausstrasse 2, Aachen, NRW, 52066, Germany
Herbert Boerner
Affiliation:
herbert.boerner@philips.com, Philips Research Laboratories, Weisshausstrasse 2, Aachen, NRW, 52066, Germany
Volker van Elsbergen
Affiliation:
volker.van.elsbergen@philips.com, Philips Research Laboratories, Weisshausstrasse 2, Aachen, NRW, 52066, Germany
Hans-Peter Löbl
Affiliation:
hans-peter.loebl@philips.com, Philips Research Laboratories, Weisshausstrasse 2, Aachen, NRW, 52066, Germany
Edward Young
Affiliation:
edward.young@philips.com, Philips Research Laboratories, Weisshausstrasse 2, Aachen, NRW, 52066, Germany
Holger Heil
Affiliation:
holger.heil@merck.com, Merck OLED Materials GmbH, Industrial Park Höchst, Building F 821, Frankfurt/Main, HE, 65926, Germany
Rocco Fortte
Affiliation:
rocco.fortte@merck.com, Merck OLED Materials GmbH, Industrial Park Höchst, Building F 821, Frankfurt/Main, HE, 65926, Germany
Heinrich Becker
Affiliation:
heinrich.becker@merck.com, Merck OLED Materials GmbH, Industrial Park Höchst, Building F 821, Frankfurt/Main, HE, 65926, Germany
Michael Heuken
Affiliation:
m.heuken@aixtron.com, RWTH Aachen, Institut für Theoretische Elektrotechnik, Kopernikusstrasse 16, Aachen, NRW, 52074, Germany
Holger Kalisch
Affiliation:
kalisch@ithe.rwth-aachen.de, RWTH Aachen, Institut für Theoretische Elektrotechnik, Kopernikusstrasse 16, Aachen, NRW, 52074, Germany
Rolf H. Jansen
Affiliation:
rhj@ithe.rwth-aachen.de, RWTH Aachen, Institut für Theoretische Elektrotechnik, Kopernikusstrasse 16, Aachen, NRW, 52074, Germany
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Abstract

In this work, organic light emitting devices (OLEDs) based on a blue-emitting fluorescent guest/host-system from Merck OLED Materials GmbH is investigated. OLEDs comprising a hole transport layer (HTL), the emissive film Merck Blue Host:Merck Blue Guest (MBH:MBG), a hole-blocking film and the electron transport layer (ETL) were prepared by vacuum thermal evaporation. The hole-blocking capabilities of aluminum(III)bis(2-methyl-8-quinolinato)4-phenylphenolate (BAlq) and the host material MBH were investigated. By employing an additional HBL, the current efficiency could be increased from 5.7 to 7.4 cd/A. Furthermore, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyano-quinodimethane (F4-TCNQ) doping of the HTL was investigated. Devices with 4,7-diphenyl-1,10-phenanthroline (BPhen) or 1,3,5-Tris-(N-phenylbenzimidazol-2-yl)benzene (TPBI) as alternative ETLs were fabricated and conclusions were drawn regarding the charge balance in the devices. It was found that employing tris-(8-hydroxyquinoline) aluminum (Alq3) as ETL leads to the best lifetimes of about 2000 hours at a constant current of 20 mA/cm2 while p-doping in combination with BPhen as ETL leads to the highest efficiency of 5.7 lm/W max. and 4.4 lm/W at 1000 cd/m2.

Keywords

organicoptoelectronicluminescence
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 916: Symposium DD – Solid-State Lighting Materials and Devices , 2006 , 0916-DD01-05
Copyright
Copyright © Materials Research Society 2006

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References

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