Electrical properties of liquid crystal materials with temperature

Nan WU; Yi-yang HUANG; Jiao ZHANG; Ya-ning FAN; Pu-yang FANG; Xiang-ming KONG; Ming-lei CAI; Tong-zhou ZHAO; Chang-yong YANG; Wen-jiang YE

doi:10.37188/CJLCD.2021-0218

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Electrical properties of liquid crystal materials with temperature

Material Physics | 更新时间：2021-12-10

- Electrical properties of liquid crystal materials with temperature
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 12, Pages: 1605-1613(2021)
- 作者机构：
  
  1.河北工业大学理学院, 天津 300401
  2.河北工业大学材料科学与工程学院, 天津 300401
  3.河北冀雅电子有限公司, 河北石家庄 050071
  4.河北省平板显示器工程技术研究中心, 河北石家庄 050071
- 作者简介：
- 基金信息：
  
  Supported by Natural Science Foundation of Hebei Province(A2019202235);Special Project of China Association of Higher Education(21LKYB05)
- DOI：10.37188/CJLCD.2021-0218
  CLC： O753.2
- Received：13 August 2021，
  
  Revised：04 September 2021，
  
  Published：2021-12
- 稿件说明：
移动端阅览
Nan WU, Yi-yang HUANG, Jiao ZHANG, et al. Electrical properties of liquid crystal materials with temperature[J]. Chinese journal of liquid crystals and displays, 2021, 36(12): 1605-1613.
DOI：

Nan WU, Yi-yang HUANG, Jiao ZHANG, et al. Electrical properties of liquid crystal materials with temperature[J]. Chinese journal of liquid crystals and displays, 2021, 36(12): 1605-1613. DOI： 10.37188/CJLCD.2021-0218.

摘要

温度变化会对液晶材料的电学特性产生影响。为了深入探究低温下液晶材料的电学特性，首先，液晶盒厚度和取向层厚度分别由紫外可见分光光度计和表面轮廓仪测量得到；然后，利用精密热台以及基于热电制冷工作原理自制的制冷装置控制液晶盒的温度，使用校准后的精密LCR表分别测得低温和常温下液晶盒电容-电压（

）特性曲线，由液晶盒电容模型得到液晶层

特性曲线，基于该曲线与双盒模型，得到了温度对4种液晶介电各向异性、弹性常数的影响。实验结果表明：随着温度的升高，正性液晶材料的介电各向异性从10.0增大至21.0，弹性常数

从17.0 pN减小至7.0 pN，

从31.0p N减小至16.0 pN；负性液晶材料的介电各向异性从-8.5增大至-3.0，

从21.0 pN减小至11.0 pN，

从31.0 pN减小至13.0 pN。即随着温度的升高，正性液晶材料的介电各向异性和弹性常数

、

均不断减小；负性液晶材料的介电各向异性不断增大，

、

呈现减小趋势。该结论对探究低温下提升液晶显示性能的方法有着重要意义。

Abstract

The change of temperature can affect the electrical properties of liquid crystal (LC) materials. In order to further explore the electrical properties of LC materials at low temperature

firstly

the thicknesses of the LC cells and the polymide (PI) alignment layers were measured by UV spectrophotometer and surface profiler respectively. Then

a precision hot stage and a self-made refrigeration device based on the working principle of thermoelectric refrigeration were used to control the temperature of the LC cell

and the precision LCR meter which was calibrated was applied to measure the capacitance-voltage (

) curve of LC cell at low and normal temperatures. The

curve of LC layer could be obtained by using the capacitance model of LC cell

and based on this curve and dual-cell model

the effects of temperature on dielectric anisotropy and elastic constant of four kinds of LCs were obtained. The experimental results show that the dielectric anisotropy of the LC with positive dielectric anisotropy increases from 10.0 to 20.0

and the elastic constant

decreases from 17.0 pN to 7.0 pN

and

decreases from 31.0 pN to 15.0 pN. The dielectric anisotropy of the LC with negative dielectric anisotropy increases from -8.5 to -3.0

decreases from 21.0 pN to 11.0 pN for

and from 31.0 pN to 12.0 pN for

. The dielectric anisotropy and elastic constant

and

of the LC with positive dielectric anisotropy decrease with the increase of the temperature

and increase and decrease respectively with increasing temperature for the LC with negative dielectric anisotropy. This conclusion is of great significance for exploring the methods to improve the performance of liquid crystal display at low temperature.

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references

T KIM , J H LEE , T H YOON , 等 . Reflective dual-mode liquid crystal display possessing low power consumption and high contrast ratio under ambient light . Optics Express , 2012 . 20 ( 14 ): 15522 - 15529 . DOI: 10.1364/OE.20.015522 http://doi.org/10.1364/OE.20.015522 .

林述锋 , 沈田子 . 氧化石墨烯液晶的光电特性与显示应用 . 液晶与显示 , 2020 . 35 ( 7 ): 733 - 740 . DOI: 10.37188/YJYXS20203507.0733 http://doi.org/10.37188/YJYXS20203507.0733 .

S F LIN , T Z SHEN . Electrical-optical properties of graphene oxide liquid crystal and its applications . Chinese Journal of Liquid Crystals and Displays , 2020 . 35 ( 7 ): 733 - 740 . DOI: 10.37188/YJYXS20203507.0733 http://doi.org/10.37188/YJYXS20203507.0733 .

J PRAKASH , A CHANDRAN , A M BIRADAR . Scientific developments of liquid crystal-based optical memory . Reports on Progress in Physics , 2017 . 80 ( 1 ): 016601 DOI: 10.1088/0034-4885/80/1/016601 http://doi.org/10.1088/0034-4885/80/1/016601 .

M MRUKIEWICZ , K KOWIORSKI , P PERKOWSKI , 等 . Threshold voltage decrease in a thermotropic nematic liquid crystal doped with graphene oxide flakes . Beilstein Journal of Nanotechnology , 2019 . 10 71 - 78 . DOI: 10.3762/bjnano.10.7 http://doi.org/10.3762/bjnano.10.7 .

M YOUSEFI , S M ROZATI , N NAJAFI . Investigation of the effect of temperature on the structural, optical, electrical, and self-cleaning properties of ITO thin films . Applied Physics A , 2020 . 126 ( 7 ): 523 DOI: 10.1007/s00339-020-03695-z http://doi.org/10.1007/s00339-020-03695-z .

S YANG , S R WANG , H LIAO , 等 . Improving the performance of Cu 2 ZnSnS 4 thin film solar cell by engineering the ITO film thickness . Physica B: Condensed Matter , 2020 . 589 412196 DOI: 10.1016/j.physb.2020.412196 http://doi.org/10.1016/j.physb.2020.412196 .

J LI , Z Y CHE , L C MO , 等 . 5, 6-Difluorobenzofuran: a new core for the design of liquid crystal compound with large dielectric anisotropy and broad nematic range . Liquid Crystals , 2021 . 48 ( 2 ): 273 - 280 . DOI: 10.1080/02678292.2020.1777473 http://doi.org/10.1080/02678292.2020.1777473 .

M FOUZAI , A GUESMI , HAMADI N BEN , 等 . Fluoro-substitution in hydrogen bonding liquid crystal benzoic acid: dielectric, electro-optic and optical proprieties and inducing polar nematic phase . Liquid Crystals , 2020 . 47 ( 5 ): 777 - 784 . DOI: 10.1080/02678292.2019.1679900 http://doi.org/10.1080/02678292.2019.1679900 .

J LI , X Z YANG , D Y WAN , 等 . Increasing the negative dielectric anisotropy of liquid crystals by fluorination of the terminal ethyl chain . Liquid Crystals , 2020 . 47 ( 14/15 ): 2268 - 2275 . http://www.tandfonline.com/doi/full/10.1080/02678292.2020.1769755 http://www.tandfonline.com/doi/full/10.1080/02678292.2020.1769755 .

H ONNAGAWA , K MIYASHITA . Electric field dependence of the capacitance of a twisted nematic liquid crystal cell . Japanese Journal of Applied Physics , 1975 . 14 ( 7 ): 1061 - 1062 . DOI: 10.1143/JJAP.14.1061 http://doi.org/10.1143/JJAP.14.1061 .

M Z JIAO , Z B GE , Q SONG , 等 . Alignment layer effects on thin liquid crystal cells . Applied Physics Letters , 2008 . 92 ( 6 ): 061102 DOI: 10.1063/1.2841642 http://doi.org/10.1063/1.2841642 .

W J YE , R YUAN , Y Y DAI , 等 . Improvement of image sticking in liquid crystal display doped with γ-Fe 2 O 3 nanoparticles . Nanomaterials , 2018 . 8 ( 1 ): 5 http://www.onacademic.com/detail/journal_1000040542794910_59cb.html http://www.onacademic.com/detail/journal_1000040542794910_59cb.html .

Y Y DAI , L GAO , Y K CHANG , 等 . Dielectric and elastic properties of fluorine-containing tricyclic isothiocyanate liquid crystal . Liquid Crystals , 2019 . 46 ( 6 ): 930 - 940 . DOI: 10.1080/02678292.2018.1540066 http://doi.org/10.1080/02678292.2018.1540066 .

N GAO , S JING , X M KONG , 等 . Low-temperature properties of nematic liquid crystal materials for display . Liquid Crystals , 2021 . DOI: 10.1080/02678292.2021.1892222 http://doi.org/10.1080/02678292.2021.1892222 .

杨振 , 朱璨 , 柯亚娇 , 等 . Peltier效应: 从线性到非线性 . 物理学报 , 2021 . 70 ( 10 ): 108402 .

Z YANG , C ZHU , Y J KE , 等 . Peltier effect: from linear to nonlinear . Acta Physica Sinica , 2021 . 70 ( 10 ): 108402 .

王子昂 , 黄富瑜 , 邹昌帆 , 等 . 基于帕尔贴效应的双波段自适应标定板设计 . 光子学报 , 2019 . 48 ( 9 ): 0912002 .

Z A WANG , F Y HUANG , C F ZOU , 等 . Design of dual-band adaptive calibration checkerboard based on Peltier effect . Acta Photonica Sinica , 2019 . 48 ( 9 ): 0912002 .

戴亚雨 , 高林 , 庞泽 , 等 . 外加电压频率对液晶介电各向异性的影响 . 液晶与显示 , 2018 . 33 ( 3 ): 175 - 181 . DOI: 10.3788/YJYXS20183303.0175 http://doi.org/10.3788/YJYXS20183303.0175 .

Y Y DAI , L GAO , Z PANG , 等 . Influence of the frequency of external applied voltage on the dielectric anisotropy of liquid crystal . Chinese Journal of Liquid Crystals and Displays , 2018 . 33 ( 3 ): 175 - 181 . DOI: 10.3788/YJYXS20183303.0175 http://doi.org/10.3788/YJYXS20183303.0175 .

高林 , 戴亚雨 , 常雨珂 , 等 . 含氟三环NCS液晶材料的介电性能研究 . 液晶与显示 , 2018 . 33 ( 7 ): 561 - 567 . DOI: 10.3788/YJYXS20183307.0561 http://doi.org/10.3788/YJYXS20183307.0561 .

L GAO , Y Y DAI , Y K CHANG , 等 . Dielectric properties of fluorine-containing tricyclic NCS liquid crystal materials . Chinese Journal of Liquid Crystals and Displays , 2018 . 33 ( 7 ): 561 - 567 . DOI: 10.3788/YJYXS20183307.0561 http://doi.org/10.3788/YJYXS20183307.0561 .

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