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Poly(3.4-ethylene dioxythiophene)- and polyaniliane-Poly(perfluoroethylenesulfonic acid) as hole injecting layers in polymer light emitting devices
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

We present a study of poly(3,4-ethylene dioxythiophene), PEDOT, and polyaniline, where poly(perfluoroethylenesulfonic acid), PFESA has been used as counter ion and dopant respectively. The study was done in order to establish how the material petfonns as hole injecting layers in polymer light emitting devices. A total of 19 different PEDOT-PFESA samples and three different PAni-PFESA systems were studied, each with a different acidity, ranging between pH 1.6 to pH 7.7. The highest work function obtained was 6.0 eV and work function and acidity correlate such that significantly higher work functions are obtained for higher acidities. Photoelectron spectroscopy and Atomic Force Microscopy data suggest that the resulting fihns have grain structured morphology where the PAni-PFESA and PEDOT-PFESA systems form inverse micelles, i.e. PEDOT or PAni together with counter ions as an inner core surrounded by mainly the PFESA backbone.

National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-85555OAI: oai:DiVA.org:liu-85555DiVA: diva2:571606
Available from: 2012-11-23 Created: 2012-11-23 Last updated: 2013-10-31
In thesis
1. Materials study of organic electronics
Open this publication in new window or tab >>Materials study of organic electronics
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The electronic structure of materials for use in organic electronics is studied in this thesis. The first part includes applied research in the form of studies of polymers for use in polymer light emitting devices. The second part is more directed toward organic based spintronics and contains research regarding a room temperature organic ferrimagnetic material. Common for the studies, apart from that all regard organic material, are the use of electron spectroscopy techniques. The studies give new spectroscopic evidence of how the energy level alignment occurs between electrical conductors and spin coated semiconducting polymers, i.e. alignment at the anode side of polymer light emitting devices. The studies prove theoretical predictions regarding spontaneous charge injection forming positive polaronic species in the semiconducting polymer, pinned to the Fermi level of the substrate. The first part also includes studies of novel conducting polymers, based on PEDOT and polyaniline, with work functions spanning from 4.2 eV to 6.4 eV. In the case of organic magnets, our design and construction of the purpose built vacuum deposition system allowed for the first time oxygen free films of the extremely reactive organic ferrimagnet, vanadium tetracyanoethylene (V(TCNE)x), to be studied by means of several different electron spectroscopies, proving or disproving several previous results and assumptions.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2005. 48 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 971
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-32276 (URN)18164 (Local ID)91-85457-30-2 (ISBN)18164 (Archive number)18164 (OAI)
Public defence
2005-10-21, Hörsal K3, Campus Norrköping, Norrköping, 10:15 (Swedish)
Opponent
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2012-11-23
2. Physics of materials in organic electronics
Open this publication in new window or tab >>Physics of materials in organic electronics
2004 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The research included in this thesis is regarding materials physics in organic electronics. The thesis consists of two projects: one applied and one basic science in nature. The applied project concerns modification of charge injection properties in organic electronics. The choice of the materials used as anodes and cathodes in polymer light emitting devices, PLEDs, plays a crucial role in device performance. The electrodes, often multi-component/layer systems, need to be chosen in such a way that that they fit the properties of the active material. Here, the electronic, chemical and physical properties of materials for so-called hole transporting layers (HTL) were studied and used to explain and improve the performance of polymer-based light emitting diodes (PLED). The study focused on the properties most important for devices, e.g. film morphology, work function and chemical composition, and the results were compared to PLED 1-V characteristics and luminescence efficiency. The second project aimed to provide basic understanding of issues concerning charge confinement (and charge injection) in small molecules. The n-doping of an component of an organic-based magnetic semiconductor was studied as a first step towards understanding the electronic and magnetic properties of the actual magnetic material.

Place, publisher, year, edition, pages
Norrköping, Sweden: Linköpings universitet, 2004. 43 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1086
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-22732 (URN)LiU-TEK-LIC-2004:15 (ISRN)2037 (Local ID)91-7373-932-4 (ISBN)2037 (Archive number)2037 (OAI)
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-10-31

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Tengstedt, CarlBraun, SlawomirSalaneck, William R.Fahlman, Mats

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