Comparative study of optoelectronic properties of various Europium complexes used in organic electroluminescent structures

M. Chakaroun; R. Antony; R. Demadrille; A. Moliton

doi:10.1117/12.663099

20 April 2006 Comparative study of optoelectronic properties of various Europium complexes used in organic electroluminescent structures

M. Chakaroun, R. Antony, R. Demadrille, A. Moliton

Author Affiliations +

Proceedings Volume 6192, Organic Optoelectronics and Photonics II; 619221 (2006) https://doi.org/10.1117/12.663099
Event: SPIE Photonics Europe, 2006, Strasbourg, France

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 ⁵D₀ → ⁷F₂ 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, R. Antony, R. Demadrille, and 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); https://doi.org/10.1117/12.663099

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