Electro-optical properties of high birefringence liquid crystal compounds with isothiocyanate and naphthyl group

doi:10.1088/1674-1056/26/9/094210

中国物理B ›› 2017, Vol. 26 ›› Issue (9): 94210-094210.doi: 10.1088/1674-1056/26/9/094210

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Electro-optical properties of high birefringence liquid crystal compounds with isothiocyanate and naphthyl group

State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

收稿日期:2017-03-28 修回日期:2017-04-18 出版日期:2017-09-05 发布日期:2017-09-05
通讯作者: Li-Shuang Yao, Li Xuan E-mail:yaols@ciomp.ac.cn;xuanli@ciomp.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61378075, 61377032, 11604327, and 61475152) and the Science Foundation of State Key Laboratory of Applied Optics, China.

Electro-optical properties of high birefringence liquid crystal compounds with isothiocyanate and naphthyl group

State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

Received:2017-03-28 Revised:2017-04-18 Online:2017-09-05 Published:2017-09-05
Contact: Li-Shuang Yao, Li Xuan E-mail:yaols@ciomp.ac.cn;xuanli@ciomp.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61378075, 61377032, 11604327, and 61475152) and the Science Foundation of State Key Laboratory of Applied Optics, China.

摘要/Abstract

摘要：

Liquid crystal (LC) compound with isothiocyanate and naphthyl group is an attractive high birefringence LC material, and can be used in optical devices. In this paper, the electro-optical properties of a series of this type of LC compounds were investigated. The melting points and enthalpy values of these LC compounds were higher than those of corresponding compounds with the phenyl group. These compounds exhibited high birefringence with a maximum value of 0.66. Fluorine substitution in the molecular almost does not affect the birefringence value. When these LC compounds with the naphthyl group were dissolved in a commercial LC mixture, the electro-optical properties depending on temperature were investigated. In the low-temperature region, LC mixtures with the naphthyl-group LC compounds exhibited higher viscosity than pure commercial LCs. In the high-temperature region, viscosity values very closely approached each other. When response performance was investigated, figure-of-merit (FoM) values were measured. The FoM values of LC mixtures containing LC compounds with naphthyl group were lower than those of reference benzene LCs in the low-temperature region. However, in the high-temperature region, the results were reversed. These isothiocyanate LC compounds with naphthyl group can be applied in special fast-response LC device, particularly the ones used under high-temperature conditions.

关键词: naphthalene, isothiocyanate liquid crystals, high birefringence, electro-optical property

Abstract:

Key words: naphthalene, isothiocyanate liquid crystals, high birefringence, electro-optical property

中图分类号: (Liquid crystals)

42.70.Df

64.70.M- (Transitions in liquid crystals) 42.79.Kr (Display devices, liquid-crystal devices)

彭增辉, 王启东, 王少鑫, 姚丽双, 刘永刚, 胡立发, 曹召良, 穆全全, 杨程亮, 宣丽. Electro-optical properties of high birefringence liquid crystal compounds with isothiocyanate and naphthyl group[J]. 中国物理B, 2017, 26(9): 94210-094210.

Zeng-Hui Peng(彭增辉), Qi-Dong Wang(王启东), Shao-Xin Wang(王少鑫), Li-Shuang Yao(姚丽双), Yong-Gang Liu(刘永刚), Li-Fa Hu(胡立发), Zhao-Liang Cao(曹召良), Quan-Quan Mu(穆全全), Cheng-Liang Yang(杨程亮), Li Xuan(宣丽). Electro-optical properties of high birefringence liquid crystal compounds with isothiocyanate and naphthyl group[J]. Chin. Phys. B, 2017, 26(9): 94210-094210.

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Electro-optical properties of high birefringence liquid crystal compounds with isothiocyanate and naphthyl group

Electro-optical properties of high birefringence liquid crystal compounds with isothiocyanate and naphthyl group

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