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Modélisation des diodes électroluminescentes organiques multicouches dopées. Application à de nouvelles architectures.

Abstract : The development of OLED devices for display or lighting applications usually needs a long and costly experimental approach to determine the key parameters that influence the performances. An electrical model aims at replacing this complex system with a simple object and reproducing or even predicting its main behaviors (Current-Voltage characteristic, J-V) in order to reduce the number of experiments. A first method has consisted in using a continuum band model, derived from crystalline semiconductors. This 2d finite-element model notably accounted for the variations of the thicknesses of organic layers for high current densities (50 Ç J Ç 7£103 mA/cm2). We have also shown that 2d simulations are of interest to study complex architectures with a nanopatterned electrode. A second method lies in the development of a compact model based on electrical compounds, compatible with professional TCAD tools. The proposed equivalent circuit distinguishes charge injection from charge transport phenomena. It precisely reproduces, with only 8 parameters obtained from simple measurements, static J-V characteristics for a wide range of current densities (from 10¡6 to 7£103 mA/cm2) as well as the overall dynamic behavior up to MHz. This model manages to simulate complex systems such as an addressing circuit for matrix displays. Moreover, both analysis and quantification of the influence of different experimental variations make it a development and/or production control tool. The achievements and future prospects show that modeling tools are of interest to develop compounds or efficient OLED devices.
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Submitted on : Wednesday, July 21, 2010 - 9:49:46 AM
Last modification on : Wednesday, March 27, 2019 - 4:20:03 PM
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Christophe Pinot. Modélisation des diodes électroluminescentes organiques multicouches dopées. Application à de nouvelles architectures.. Physique [physics]. Ecole Polytechnique X, 2008. Français. ⟨pastel-00005744⟩

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