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Theses

Élaboration de dispositifs et matériaux mixtes à base de polymères conjugués électroluminescents

Abstract : The subject of this thesis lies in the context of organic electronic based on conjugated polymers. We have chosen the class of polyfluorène mainly because of their blue emission, good quantum efficiency and possibility of modifying their properties by grafting side groups. The originality of our research relies upon the use of a peculiar devices structure (Organic Light-emitting Electrochemical Cells, OLEC). The working principle of OLEC is based on the use of a molten salt directly added to the conjugated polymer, without involving any ionic conducting polymer. We attempt to improve the polyfluorene performance by using side groups aimed at increasing the polymer / molten salt compatibility. For this, we developed a characterization tool particularly well-adapted to our samples: atomic force microscopy in an EFM or KFM mode. We have been able to visualize precisely the phase separation occurring between the polymer and the molten salt. We have shown that the current in a device is roughly proportional to the polymer / molten salt interface. This allowed us to explain the OLEC electrical aging. Improvement of the polymer / molten salt blend via an optimization of the polymer / molten salt interface should increase device lifetime. The use of PEO and cyano side groups seems to be a way to explore. Finally, we describe the particular behaviour of the blend between a polyfluorene derivative with cyano groups and THA-TFSI, whose morphology depends on temperature and pressure conditions.
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https://tel.archives-ouvertes.fr/tel-00130247
Contributor : Florian Habrard <>
Submitted on : Saturday, February 10, 2007 - 10:58:48 AM
Last modification on : Tuesday, September 11, 2018 - 11:00:02 AM
Long-term archiving on: : Wednesday, April 7, 2010 - 2:45:51 AM

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  • HAL Id : tel-00130247, version 1

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Florian Habrard. Élaboration de dispositifs et matériaux mixtes à base de polymères conjugués électroluminescents. Micro et nanotechnologies/Microélectronique. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00130247⟩

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