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Switchable Optical Polarizer Based on Electrochromism in Stretch-Aligned Polyaniline
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-5154-0291
2003 (English)In: Applied Physics Letters, ISSN 0003-6951, Vol. 83, no 7, 1307-1309 p.Article in journal (Refereed) Published
Abstract [en]

We report on the polarizing electrochromic (EC) effect of a conjugated polymer. This has been achieved in a planar flexible electrochemical device cell comprised of a patterned stretch-aligned thin film of polyaniline and an electrolyte, all made on a polyethylene foil substrate. The resulting device exhibits polarized absorption characteristics, of a dichroic ratio of 4, that can be controlled by the voltage applied. Also, thin flexible EC polarizers have been realized by combining two stretch-aligned polyaniline films with orthogonal stretching direction. In the resulting EC polarizer the orientation of the polarized absorption can be switched between two orthogonal directions, depending on the voltage applied.

Place, publisher, year, edition, pages
2003. Vol. 83, no 7, 1307-1309 p.
Keyword
optical polymers, electrochromism, polymer films, optical polarisers
Identifiers
URN: urn:nbn:se:liu:diva-13799DOI: 10.1063/1.1602556OAI: oai:DiVA.org:liu-13799DiVA: diva2:21642
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-02-03
In thesis
1. Charge Transport Modulation and Optical Absorption Switching in Organic Electronic Devices
Open this publication in new window or tab >>Charge Transport Modulation and Optical Absorption Switching in Organic Electronic Devices
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Organic electronics has evolved into a well-established research field thanks to major progresses in material sciences during recent decades. More attention was paid to this research field when “the discovery and development of conductive polymers” was awarded the Nobel Prize in Chemistry in 2000. Electronic devices that rely on tailor-made material functionalities, the ability of solution processing and low-cost manufacturing on flexible substrates by traditional printing techniques are among the key features in organic electronics. The common theme while exploring organic electronics, and the focus of this thesis, is that (semi-)conducting polymers serve as active materials to define the principle of operation in devices.

This thesis reviews two kinds of organic electronic devices. The first part describes electrochemical devices based on conducting polymers. Active matrix addressed displays that are printed on flexible substrates have been obtained by arranging electrochemical smart pixels, based on the combination of electrochemical transistors and electrochromic display cells, into cross-point matrices. The resulting polymer-based active-matrix displays are operated at low voltages and the same active material is used in the electrochemical transistors as well as in the electrochromic display cells, simply by employing the opto-electronic properties of the material. In addition to this first part, a switchable optical polarizer based on electrochromism in a stretch-aligned conducting polymer is described. The second part reports switchable charge traps in polymer diodes. Here, a device based on a solid-state blend of a conjugated polymer and a photochromic molecule has been demonstrated. The solid state blend, sandwiched between two electrodes, provide a polymer diode that allows reversible current modulation between two different charge transport mechanisms via externally triggered switching of the charge trap density.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap, 2007
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1147
Keyword
electrochromic, photochromic, PEDOT:PSS, active matrix display, switchable charge traps, printed electronics, switchable polarizer
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-10271 (URN)978-91-85895-35-9 (ISBN)
Public defence
2007-12-14, K3, Kåkenhus, LiU Norrköping, Norrköping, 13:00 (English)
Opponent
Supervisors
Available from: 2007-11-21 Created: 2007-11-21 Last updated: 2017-02-03
2. Electrochromic Polymer Devices: Active-Matrix Displays and Switchable Polarizers
Open this publication in new window or tab >>Electrochromic Polymer Devices: Active-Matrix Displays and Switchable Polarizers
2006 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Major efforts have been spent during recent years in worldwide attempts to achieve an electronic paper technology; the common name for novel flexible displays utilizing substrates such as paper, plastics or thin metal sheets. Various kinds of technology are available that potentially will be used for an electronic paper, which differs from each other mainly with respect to the choice of active materials, substrates and manufacturing techniques. There are many applications for electronic paper technology, ranging from high-resolution displays used in electronic books to updateable large-area billboards. The latter suggests a novel electronic display function that could extend the utilization of cellulose-based paper, which is one of the most common materials ever produced by mankind, by using the paper as a thin and flexible carrier. The requirement for fast update speed in such large area applications would probably be a bit more relaxed compared to traditional display technologies, while low-power consumption and bi-stability are among the factors that should be further emphasized, together with the utilization of well-established printing techniques to enable low-cost manufacturing of the displays. The choice of active materials is therefore crucial in order to reach these objectives in reality and this paves the way for printable conjugated polymers with electrochromic properties. Chemical synthesis of these materials during the last decades has resulted in a vast variety of electrochromic polymers with custom-tailored functionality covering a broad range of optical absorption and electrical conductivities.

This thesis review the studies done on the electrochemical switching of poly(3,4-ethylenedioxythiophene) (PEDOT). For this material both the electrical conductivity and the optical absorption is controlled by the oxidation state. Active matrix addressed displays that are printed on flexible substrates have been obtained by arranging electrochemical smart pixels, based on the combination of electrochemical transistors and electrochromic display cells, into cross-point matrices. The resulting polymer-based active-matrix displays are operated at low voltages and the same active material can be used in electrochemical transistors and conducting lines and in electrochromic display cells employing the electronic and the opto-electonic properties of the material, respectively. In addition to this, a switchable optical polarizer is briefly discussed. This is a device utilizing electrochromism of stretch-aligned polyaniline (PANI). The combination of two identical devices in a vertical architecture, orthogonally oriented with respect to each other, results in a filter in which the orientation of the polarized optical absorption is governed by the voltage polarity applied to the device.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap, 2006. 53 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1237
Keyword
conjugated polymer, PEDOT:PSS, active-matrix, displays, polarizer, polyaniline
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-6102 (URN)91-85497-35-5 (ISBN)
Presentation
2006-03-02, TP2, Täppan, LIU Norrköping - Linköping University, Norrköping, 10:15 (English)
Opponent
Supervisors
Note
Report code: LiU-TEK-LIC- 2006:18Available from: 2006-03-22 Created: 2006-03-22 Last updated: 2017-02-03

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Andersson, PeterKugler, ThomasBerggren, Magnus

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