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Proceedings Paper

Comparative study of optoelectronic properties of various Europium complexes used in organic electroluminescent structures
Author(s): M. Chakaroun; R. Antony; R. Demadrille; A. Moliton
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Paper Abstract

In order to obtain a red emission with organic electroluminescent device, we realized multilayer structures using various Europium complexes as emitting layer. The multilayer structures were obtained with the emitting layer deposited on a ITO substrate; a 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) layer was used as hole blocking layer and a tris-(8-hydroxyquinoline) aluminium (Alq3) layer as electron transport layer. Cathode of the devices was realized with a calcium layer covered with an protective aluminium layer. Two different europium complexes have been tested: Eu (TTA)3 phen (TTA = thenoyltrifluoroacetone), Eu (DTP)3 (dipphen) (DTP = 1,3-di(2-thienyl)propane-1,3-dione, dipphen = 4,7-Diphenyl-1,10-phenanthroline) The Europium complexes were inserted in a poly-9-vinylcarbazole (PVK) matrix and the "spin-coating" process was used to obtain the emitting layers. The maximum emission of the OLEDs are centered around 610 nm according to the 5D07F2 transition of the rare earth. Europium complexes absorption spectra in chloroform and electroluminescence spectra are presented. Current-voltage and luminance-voltage characteristics are also presented and we discuss about the results obtained with various molar concentration of Europium complexes in the PVK matrix.

Paper Details

Date Published: 20 April 2006
PDF: 10 pages
Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619221 (20 April 2006); doi: 10.1117/12.663099
Show Author Affiliations
M. Chakaroun, XLIM-MINACOM (France)
R. Antony, XLIM-MINACOM (France)
R. Demadrille, CEA Grenoble, DRFMC (France)
A. Moliton, XLIM-MINACOM (France)

Published in SPIE Proceedings Vol. 6192:
Organic Optoelectronics and Photonics II
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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