Efficient full-color electroluminescence and stimulated emission with polyphenylenes

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

doi:10.1117/12.332601

16 December 1998 Efficient full-color electroluminescence and stimulated emission with polyphenylenes

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

Author Affiliations +

Proceedings Volume 3476, Organic Light-Emitting Materials and Devices II; (1998) https://doi.org/10.1117/12.332601
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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.

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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, and Douglas Gin "Efficient full-color electroluminescence and stimulated emission with polyphenylenes", Proc. SPIE 3476, Organic Light-Emitting Materials and Devices II, (16 December 1998); https://doi.org/10.1117/12.332601

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