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Proceedings Paper

Electroluminescence and photovoltaic effects using columnar mesogenic compounds
Author(s): Thomas Hassheider; Stephan A. Benning; Marcus W. Lauhof; Reinhold Oesterhaus; Sonia Alibert-Fouet; Harald Bock; John W. Goodby; Mark D. Watson; Klaus Muellen; Heinz-Siegfried Kitzerow
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Paper Abstract

Columnar liquid crystals are useful for the construction of organic light emitting diodes (OLED) due to their high charge carrier mobility and their ability of developing defect-free superstructures. We investigated the electroluminescent properties of various mesogenic derivatives of triphenylene, pyrene, perylene, benzoperylene and hexa-peri-hexabenzocoronene (HBC) which combine good charge carrying properties and luminescence. The wavelengths of maximum electroluminescence range from about 400 nm to 720 nm, depending on the core and the substitution of the molecules. Nearly white emission can be obtained in samples containing two or more emitting layers. The perylene core is so efficient that even a single organic layer between an ITO anode and an aluminum cathode can give luminance values up to 100 cd/m2. In addition to the electroluminescence, we present results on the photovoltaics in hetero junction structures of the compounds. Samples with two organic layers made of a HBC- and a perylene derivative show an open circuit voltage Voc of about 0.8 V, a short circuit current Isc of a few μA/cm2, and a filling factor FF of about 31 %.

Paper Details

Date Published: 30 April 2003
PDF: 8 pages
Proc. SPIE 5003, Liquid Crystal Materials, Devices, and Applications IX, (30 April 2003); doi: 10.1117/12.473864
Show Author Affiliations
Thomas Hassheider, Univ. of Paderborn (Germany)
Stephan A. Benning, Univ. of Paderborn (Germany)
Marcus W. Lauhof, Univ. of Paderborn (Germany)
Reinhold Oesterhaus, Univ. of Paderborn (Germany)
Sonia Alibert-Fouet, Univ. Bordeaux I (France)
Harald Bock, Univ. Bordeaux I (France)
John W. Goodby, Univ. of Hull (United Kingdom)
Mark D. Watson, Max Planck Institute for Polymer Research (Germany)
Klaus Muellen, Max Planck Institute for Polymer Research (Germany)
Heinz-Siegfried Kitzerow, Univ. of Paderborn (Germany)

Published in SPIE Proceedings Vol. 5003:
Liquid Crystal Materials, Devices, and Applications IX
Liang-Chy Chien, Editor(s)

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