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Chin. Phys. B, 2017, Vol. 26(9): 094210    DOI: 10.1088/1674-1056/26/9/094210
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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

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

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.

Keywords:  naphthalene      isothiocyanate liquid crystals      high birefringence      electro-optical property     
Received:  28 March 2017      Published:  05 September 2017
PACS:  42.70.Df (Liquid crystals)  
  64.70.M- (Transitions in liquid crystals)  
  42.79.Kr (Display devices, liquid-crystal devices)  
Fund: 

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.

Corresponding Authors:  Li-Shuang Yao, Li Xuan     E-mail:  yaols@ciomp.ac.cn;xuanli@ciomp.ac.cn

Cite this article: 

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 2017 Chin. Phys. B 26 094210

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