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Printable All-Organic Electrochromic Active-Matrix Displays
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering. 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
2007 (English)In: Advanced Functional Materials, ISSN 1616-301X, Vol. 17, no 16, 3074-3082 p.Article in journal (Refereed) Published
Abstract [en]

All-organic active matrix addressed displays based on electrochemical smart pixels made on flexible substrates are reported. Each individual smart pixel device combines an electrochemical transistor with an electrochromic display cell, thus resulting in a low-voltage operating and robust display technology. Poly(3,4-ethylenedioxythiophene) (PEDOT) doped with poly(styrenesulfonate) (PSS) served as the active material in the electrochemical smart pixels, as well as the conducting lines, of the monolithically integrated active-matrix display. Different active-matrix display addressing schemes have been investigated and a matrix display fill factor of 65 % was reached. This is achieved by combining a three-terminal electrochemical transistor with an electrochromic display cell architecture, in which an additional layer of PEDOT:PSS was placed on top of the display cell counter electrode. In addition, we have evaluated different kinds of electrochromic polymer materials aiming at reaching a high color switch contrast. This work has been carried out in the light of achieving a robust display technology that is easily manufactured using a standard label printing press, which forced us to use the fewest different materials as well as avoiding exotic and complex device architectures. Together, this yields a manufacturing process of only five discrete patterning steps, which in turn promise for that the active matrix addressed displays can be manufactured on paper or plastic substrates in a roll-to-roll production procedure.

Place, publisher, year, edition, pages
2007. Vol. 17, no 16, 3074-3082 p.
Keyword [en]
Displays, Electrochromic materials, Electronic paper
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-12766DOI: 10.1002/adfm.200601241OAI: oai:DiVA.org:liu-12766DiVA: diva2:17010
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

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Andersson, PeterForchheimer, RobertTehrani, PaymanBerggren, Magnus

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