Enhanced reflection band broadening in polymer stabilized cholesteric liquid crystals with negative dielectric anisotropy

被引：19

作者：

Nemati, Hossein ^{[1
]}

Liu, Shiyi ^{[1
]}

Moheghi, Alireza ^{[1
]}

Tondiglia, Vincent P. ^{[2
,3
]}

Lee, Kyung Min ^{[2
,4
]}

Bunning, Timothy J. ^{[2
]}

Yang, Deng-Ke ^{[1
]}

机构：

[1] Kent State Univ, Liquid Crystal Inst, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA

[2] US Air Force, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

[3] Leidos, 3745 Pentagon Blvd, Dayton, OH 45431 USA

[4] Azimuth Corp, 4134 Linden Ave, Dayton, OH 45432 USA

来源：

JOURNAL OF MOLECULAR LIQUIDS | 2018年 / 267卷

关键词：

D O I：

10.1016/j.molliq.2018.02.054

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The photonic band gap of cholesteric liquid crystal with negative dielectric anisotropies can be broadened under DC electric voltages by polymer stabilization. The broadening is produced by the movement and aligning effect of the dispersed "structural" chiral polymer network. We carried out a systematic study of factors, such as the alignment layer, moisture and ionic additives, which affect the broadening. Our experimental results show that the degree of broadening is strongly dependent on the ion concentration in the polymer stabilized cholesteric liquid crystal. We observed a linear relation between the broadening and the ion density. By using the optimal material formulation, we achieve 3 folds broadening to cover the entire visible light region with low voltages. (C) 2018 Published by Elsevier B.V.

引用

页码：120 / 126

页数：7

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