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Proceedings Paper

Efficient full-color electroluminescence and stimulated emission with polyphenylenes
Author(s): Guenther Leising; Emil J. W. List; Christian Zenz; Stefan Tasch; Christoph Brandstaetter; Wilhelm Graupner; Peter Markart; Farideh Meghdadi; Gerald Kranzelbinder; Arnold Niko; Roland Resel; Egbert Zojer; P. Schlichting; U. Rohr; Y. Geerts; Ullrich Scherf; Klaus Muellen; Ryan Smith; Douglas Gin
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Paper Abstract

We demonstrate the fabrication and characterization of highly efficient red-green-blue (RGB) and white light emitting devices based on poly(phenylene) type materials as the hexaphenyl and the methyl substituted laddertype poly(para phenylene) (m-LPPP). The RGB-devices are fabricated with an external color conversion technique based on PHP, whereas the white light emission is generated by an internal excitation energy transfer from the blue m-LPPP component to a red light-emitting polymer in a polymer blend, which is used as the active layer in a light-emitting diode. We present photophysical properties, like spectral line-shape site selectivity of photoluminescence (PL), and electroluminescence of bulk poly(para-phenylenevinylene) PPV films and isolated PPV chains incorporated into a self- assembled matrix material, which leads to the formation of a regular hexagonal array of channels with a diameter of about 15 angstrom, in which the conjugated polymer chains are contained. The structure of the nano-composite in organic- light-emitting-diodes. A suitably structured m-LPPP waveguide shows a spectrally very narrow high directional blue-green light output when optically pumped. The high optical gain of m-LPPP is a results of the spectral separation of stimulated emission and photoinduced absorption bands, thus spectral narrowing is even observable in below cut-off waveguides. Under resonant excitation conditions, we observe strong stimulated Raman scattering.

Paper Details

Date Published: 16 December 1998
PDF: 12 pages
Proc. SPIE 3476, Organic Light-Emitting Materials and Devices II, (16 December 1998); doi: 10.1117/12.332601
Show Author Affiliations
Guenther Leising, Technische Univ. Graz (Austria)
Emil J. W. List, Technische Univ. Graz (Austria)
Christian Zenz, Technische Univ. Graz (Austria)
Stefan Tasch, Technische Univ. Graz (Austria)
Christoph Brandstaetter, Technische Univ. Graz (Austria)
Wilhelm Graupner, Technische Univ. Graz (United States)
Peter Markart, Technische Univ. Graz (Austria)
Farideh Meghdadi, Technische Univ. Graz (Austria)
Gerald Kranzelbinder, Technische Univ. Graz (Austria)
Arnold Niko, Technische Univ. Graz (Austria)
Roland Resel, Technische Univ. Graz (Austria)
Egbert Zojer, Technische Univ. Graz (United States)
P. Schlichting, Max-Planck-Institut fuer Polymerforschung (Germany)
U. Rohr, Max-Planck-Institut fuer Polymerforschung (Germany)
Y. Geerts, Max-Planck-Institut fuer Polymerforschung (Germany)
Ullrich Scherf, Max-Planck-Institut fuer Polymerforschung (Germany)
Klaus Muellen, Max-Planck-Institut fuer Polymerforschung (Germany)
Ryan Smith, Univ. of California/Berkeley (United States)
Douglas Gin, Univ. of California/Berkeley (United States)

Published in SPIE Proceedings Vol. 3476:
Organic Light-Emitting Materials and Devices II
Zakya H. Kafafi, Editor(s)

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