Polymer-stabilized blue phases: promising mesophases for a new generation of liquid crystal displays
Polymer-stabilized blue phases: promising mesophases for a new generation of liquid crystal displays
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DOI：
10.1002/pat.3403
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发表时间：
2014-11-01
影响因子：
3.4
通讯作者：
Kitzerow, H. -S.
中科院分区：
文献类型：
--
作者：
Nordendorf, G.;Hoischen, A.;Kitzerow, H. -S.
蓝相是一种特殊的手性液晶介相，具有性能提高、制备简单等优点，有望成为电光器件的候选材料。可能应用的一个必要前提是它们存在的温度范围显著提高，这可以通过原位聚合形成的交联聚合物网络来实现。与许多其他中间相不同，如果不施加电压，蓝色相在光学上是各向同性的。对于放置在交叉偏振器之间的蓝位相单元的传输，光学各向同性至少在原则上能够实现与视角无关的完全暗状态，而不需要任何对准层。在面内电场的作用下，产生了很强的双折射(克尔效应)。有效克尔常数远大于各向同性液体的有效克尔常数，暗状态和诱导亮状态之间的转换时间在亚毫秒范围内。本文综述了蓝光相的一些基本性质、最新性能以及聚合物稳定蓝光相发展面临的挑战。版权所有(C)2014 John Wiley&Sons，Ltd.
Blue phasesspecial chiral liquid crystalline mesophasesare 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 enablesat least in principlea 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 (c) 2014 John Wiley & Sons, Ltd.