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LECs Made of m-Lppp

Published online by Cambridge University Press:  10 February 2011

F. P. Wenzl ,
S. Tasch ,
J. Gao ,
L. Holzer ,
U. Scherf ,
A.J. Heeger  and
G. Leising
F. P. Wenzl
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
J. Gao
Affiliation:
Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara,California 93106-5090, USA
L. Holzer
Affiliation:
Max-Planck-Institut für Polymerforschung, Ackermannweg 10, D-55128, Mainz, Germany
U. Scherf
Affiliation:
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria
A.J. Heeger
Affiliation:
Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara,California 93106-5090, USA
G. Leising
Affiliation:
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria
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Abstract

We report the application of the blue light emitting conjugated polymer m-LPPP (methyl substituted laddertype poly(paraphenylene) ) in light emitting electrochemical cells. The active layer of the LEC consists of a blend of m-LPPP with the ionically conductive polymer PEO and LiCF3SO3 as ionic salt. Investigations of different concentrations of PEO and salt showed that the best LECs made of m-LPPP up to now where realised with an active layer consisting of a blend of m-LPPP:PEO:salt in the range of 20:10:3. In this case we are able to realise LECs with response times in the range of 30 μs. The I/U characteristics show low turn on voltages both for current and electroluminescence, but only in the case of ITO biased as a cathode. The initial electroluminescence spectra are quite the same as those for LEDs made of m-LPPP but turn into green after some time of operation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 57
Copyright
Copyright © Materials Research Society 1998

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