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Diodes électroluminescentes organiques à microcavités résonnantes compatibles CMOS

Abstract : The aim of this work is to study the possibility to integrate low-cost optical sources in electronic circuits. Organic materials appear to be good candidates because they can be easily deposited on all kinds of substrates and some electroluminescent materials have a very good efficiency. Organic electroluminescent diodes (OLEDs) have a very broad spectral and spatial light emission, which make them poor light sources for an optical interconnection system. Therefore, we worked with resonant microcavity OLEDs which were made on thermally oxidized silicon substrates. The optical characterization of the samples showed the influence of the microcavities on the spectra and on the angular emission patterns. With the optical characteristics of two microcavities, we established the dependence of the refractive index of the ITO layer on the wavelength. Monochromatic emission is concentrated into lobes which are oriented in directions given by the resonance condition. This concentration leads to an intensity enhancement in these directions. In our structures, we observed an amplification in the forward direction comprised between 11.3 and 15.3. We also checked that a microcavity almost does not change the total intensity which is emitted by the diode. These results are in agreement with our model. The electrical characterization of the samples showed that the resistance of the ITO layer is not a deciding factor for the current – voltage characteristics of the OLEDs, and that an annealing of the ITO causes no improvement. There is a time delay between the beginning of the electrical field and the onset of the electroluminescence, due to one or several potential barriers. We measured cut-off frequencies between 6.3 kHz and 8.5 kHz.
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Contributor : Frédérique Jean <>
Submitted on : Monday, December 16, 2002 - 3:25:02 PM
Last modification on : Monday, December 16, 2002 - 3:25:02 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:02:59 PM


  • HAL Id : tel-00002144, version 1



Frédérique Jean. Diodes électroluminescentes organiques à microcavités résonnantes compatibles CMOS. Physique [physics]. Université de Bretagne occidentale - Brest, 2002. Français. ⟨tel-00002144⟩



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