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Proceedings Paper

New polymeric heterolayer systems for efficient light-emitting devices
Author(s): Sigurd K. Schrader; Walter Riess; Horst Vestweber; Norbert Koch
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Paper Abstract

Efficiency of organic light emitting devices can be increased by separating the zones of exciton recombination from the electrodes by the insertion of additional organic layers which act as protecting - and as hole or electron blocking layers. We realized such polymer hetero-layer structures by combination of hole transporting and emitting materials like polyparaphenylenevinylene (PPV) or its derivatives with new electron transporting materials, i.e. heterocyclic polymers and heterocyclic low molecular compounds, especially phenyl quinoxalines. Current-voltage molecular compounds, especially phenyl quinoxalines. Current-voltage and current-luminance characteristics were used to study the prepared heterolayer devices. Optical spectroscopy as well as UV photoelectron spectroscopy were used to characterize the electronic structure of the individual materials. Quantum chemical calculations completed the spectroscopic studies and supported the interpretation of experimental findings. Double layers made of PPV and polyphenylquinoxaline (PPQ) are characterized by low onset voltages of about 2.2 V, high efficiency, and high brightness reaching values of more than 2000 cd/m2 at a driving voltage of 10 V. The experimental findings show that PPQs are promising materials for organic electroluminescence applications.

Paper Details

Date Published: 16 December 1998
PDF: 7 pages
Proc. SPIE 3476, Organic Light-Emitting Materials and Devices II, (16 December 1998); doi: 10.1117/12.332612
Show Author Affiliations
Sigurd K. Schrader, Univ. Potsdam (Germany)
Walter Riess, IBM Zurich Research Lab. (Switzerland)
Horst Vestweber, IBM Zurich Research Lab. (Germany)
Norbert Koch, Univ. Pottsdam (Germany) and Technische Univ. Graz (Austria)

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

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