Special issue: Review
Polymer-stabilized blue phases: promising mesophases for a new generation of liquid crystal displays†
G. Nordendorf,
A. Hoischen,
J. Schmidtke,
D. Wilkes,
H.-S. Kitzerow,
G. Nordendorf
Faculty of Science, University of Paderborn, Warburger Str. 100, Paderborn, 33098 Germany
Search for more papers by this authorA. Hoischen
Faculty of Science, University of Paderborn, Warburger Str. 100, Paderborn, 33098 Germany
Search for more papers by this authorJ. Schmidtke
Faculty of Science, University of Paderborn, Warburger Str. 100, Paderborn, 33098 Germany
Search for more papers by this authorD. Wilkes
Merck KGaA, Division Performance Materials, BU Liquid Crystals—Research & Development, Frankfurter Str. 250, Darmstadt, 64293 Germany
Search for more papers by this authorCorresponding Author
H.-S. Kitzerow
Faculty of Science, University of Paderborn, Warburger Str. 100, Paderborn, 33098 Germany
Correspondence to: to: H.-S. Kitzerow, Faculty of Science, University of Paderborn, Warburger Str. 100, Paderborn 33098, Germany.
E-mail: [email protected]
Search for more papers by this authorG. Nordendorf,
A. Hoischen,
J. Schmidtke,
D. Wilkes,
H.-S. Kitzerow,
G. Nordendorf
Faculty of Science, University of Paderborn, Warburger Str. 100, Paderborn, 33098 Germany
Search for more papers by this authorA. Hoischen
Faculty of Science, University of Paderborn, Warburger Str. 100, Paderborn, 33098 Germany
Search for more papers by this authorJ. Schmidtke
Faculty of Science, University of Paderborn, Warburger Str. 100, Paderborn, 33098 Germany
Search for more papers by this authorD. Wilkes
Merck KGaA, Division Performance Materials, BU Liquid Crystals—Research & Development, Frankfurter Str. 250, Darmstadt, 64293 Germany
Search for more papers by this authorCorresponding Author
H.-S. Kitzerow
Faculty of Science, University of Paderborn, Warburger Str. 100, Paderborn, 33098 Germany
Correspondence to: to: H.-S. Kitzerow, Faculty of Science, University of Paderborn, Warburger Str. 100, Paderborn 33098, Germany.
E-mail: [email protected]
Search for more papers by this author†
This article is published in Journal of Polymers for Advanced Technologies as a special issue on 12th PAT Conference in Berlin, 2013, edited by Prof. Andreas Lendlein and Prof. Marc Behl, Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht GmbH, Centre for Materials and Coastal Research, Kantstr. 55, 14513 Teltow, Germany.
Abstract
Blue phases—special chiral liquid crystalline mesophases—are promising candidates for electro-optic devices with improved performance and simplified fabrication. A necessary precondition for possible applications is a significantly enhanced temperature range of their existence, which can be achieved by a cross-linked polymer network formed by in situ polymerization. Unlike many other mesophases, blue phases are optically isotropic if no voltage is applied. Regarding the transmission of a blue phase cell placed between crossed polarizers, the optical isotropy enables—at least in principle—a perfect dark state, independent of the viewing angle, without the necessity of any alignment layer. The application of an in-plane electric field induces a strong birefringence (Kerr effect). The effective Kerr constants are much larger than those of isotropic liquids, and the switching times between the dark and the induced bright state are in the submillisecond range. Some basic properties of blue phases, state-of-the-art performance, and remaining challenges of the development of polymer-stabilized blue phases are reviewed in this article. Copyright © 2014 John Wiley & Sons, Ltd.
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