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Study and comparison of conducting polymer hole injection layers in 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.
Dupont Displays, The Experimental Station, Wilmington, USA.
Dupont Displays, Santa Barbara, USA.
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2005 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 6, no 1, 21-33 p.Article in journal (Refereed) Published
Abstract [en]

A set of polyaniline- and poly(3,4-ethylene dioxythiophene)-based materials were studied as hole injection layers in polymer light emitting devices. The choice of polymeric counterion/dopant poly(styrenesulfonic acid), and poly(acrylamido-2-methyl-1-propanesulfonic acid), and poly(acrylamide) blended with polyaniline/poly(acrylamido-2-methyl-1-propanesulfonic acid) was found to influence both work function and film morphology, which in turn affects device performance. The work functions of the polymer films spanned the range of over 1 eV and the surface region of the films were found to be low in conducting polymer content compared to the bulk. This was particularly the case of the polyaniline/poly(acrylamido-2-methyl-1-propanesulfonic acid) blended with poly(acrylamide) which showed device efficiency equal to that of the poly(3,4-ethylene dioxythiophene)–poly(styrenesulfonic acid) reference. The turn on voltage, however, was significantly larger, likely due to the insulating poly(acrylamide)-rich surface region of the polyaniline/poly(acrylamido-2-methyl-1-propanesulfonic acid)/poly(acrylamide) film. The polymer blend of polyaniline/poly(styrenesulfonic acid) yielded the highest work function (5.5 ± 0.1 eV).

Place, publisher, year, edition, pages
2005. Vol. 6, no 1, 21-33 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-32255DOI: 10.1016/j.orgel.2005.02.001Local ID: 18135OAI: oai:DiVA.org:liu-32255DiVA: diva2:253077
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13
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, CarlCrispin, AnnicaSalaneck, William RFahlman, Mats

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