20 April 2006 Comparative study of optoelectronic properties of various Europium complexes used in organic electroluminescent structures
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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.
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M. Chakaroun, M. Chakaroun, R. Antony, R. Antony, R. Demadrille, R. Demadrille, A. Moliton, A. Moliton, } "Comparative study of optoelectronic properties of various Europium complexes used in organic electroluminescent structures", Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619221 (20 April 2006); doi: 10.1117/12.663099; https://doi.org/10.1117/12.663099
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