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Proceedings Paper

Light emission optimization of europium based complex in multilayer organic light emitting diodes
Author(s): G. Santos; F. J. Fonseca; A. M. Andrade; M. Peres; T. Monteiro; W. Simões; L. Pereira
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Paper Abstract

In this work a detailed study of the electroluminescence of an Organic Light Emitting Diode based on Europium Complex is studied as a function of the emissive layer thickness and growth rate evaporation. The device structure is glass:ITO / TPD [N,N' - bis (3 - methylphenyl) - N,N' - diphenylbenzidine] / Eu(DBM)3phen [tris (dibenzoylmethane) - mono (4,7-dimethylphenantroline) europium (III)] / Alq3 [aluminum - tris (8 - hydroxyquinoline)] / Aluminum. The minimum driving voltage is about 15 Volts although the electrical current is about only 2 mA (wall plug efficiency up to 0.002 %). The electroluminescence spectra and external efficiency are clearly dependent on the Eu (DBM)3phen layer thickness and growth rate evaporation. This results in a strong color change (CIE coordinates). With these results, a model for the device opto-electrical behavior is presented, allowing the device final optimization.

Paper Details

Date Published: 12 November 2007
PDF: 8 pages
Proc. SPIE 6655, Organic Light Emitting Materials and Devices XI, 66551U (12 November 2007); doi: 10.1117/12.734818
Show Author Affiliations
G. Santos, Univ. de São Paulo (Brazil)
F. J. Fonseca, Univ. de São Paulo (Brazil)
A. M. Andrade, Univ. de São Paulo (Brazil)
M. Peres, Univ. de Aveiro (Portugal)
T. Monteiro, Univ. de Aveiro (Portugal)
W. Simões, Univ. de Aveiro (Portugal)
L. Pereira, Univ. de Aveiro (Portugal)

Published in SPIE Proceedings Vol. 6655:
Organic Light Emitting Materials and Devices XI
Zakya H. Kafafi; Franky So, Editor(s)

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