基于光敏手性偶氮苯分子的胆甾相液晶的宽带显示

发布时间：2018-05-11 14:44

本文选题：胆甾相液晶 + 手性偶氮苯　；参考：《合肥工业大学》2017年硕士论文

【摘要】：胆甾相液晶可以自组装形成螺旋结构,具有选择性反射性能,即布拉格(Bragg)反射。通过添加光敏手性剂,在光照条件下,可以可逆调控胆甾相液晶器件Bragg反射带的移动。受液晶双折射率常数的影响,Bragg反射带带宽通常小于100nm,限制了胆甾相液晶在反射型器件中的应用。Broer等人在光照调控下实现了 Bragg反射带的扩宽,但是存在器件性能不稳定,不能可逆调控等问题。并且由于光控调节实现不同性能所需要的液晶器件的配比和光控条件存在差异,迄今为止关于胆留相液晶Bragg反射带移动和扩宽的研究都是独立进行的。使得胆甾相液晶的应用受到诸多限制。针对以上问题,本课题所涉及的研究内容包括:(1)制备新型光敏手性偶氮苯材料Azo-o-Bi,并对其光敏性能和手性性能进行表征。将其应用于光敏胆留相液晶器件的制备中,在光照条件下实现了对胆甾相液晶器件反射带的可逆调控。(2)研究液晶粘度对手性剂手性性能的影响,发现在粘度较大的液晶中,手性剂的HTP值及AHTP值都较大。通过对比在相同光照条件调控下的不同粘度的胆留相液晶器件Bragg反射带的移动速率和其在暗室中的稳定性性能,发现具有较大粘度的胆留相液晶器件的光控可逆调节性能优越,且在暗室中的稳定性最好。(3)通过控制光照条件,成功制备出胆甾相液晶的宽带显示器件。仅通过控制光照条件在相同的液晶显示器件中首次实现了对器件反射带位置和反射带带宽的可逆调控。通过研究在相同的光照条件下不同粘度的液晶宽带反射状态的稳定性性能,成功制备出具有稳定性能的胆甾相液晶宽带反射器件。通过以上研究,仅通过控制光照条件在相同的液晶显示器件中首次实现了对器件反射带位置和反射带带宽的可逆调控。并制备出具有稳定性能的红、绿、蓝显示器件和黑-白显示器件。实现了光控对于相液晶Bragg反射带的精确灵敏调控,本课题的研究将有效的扩展胆留相液晶在显示领域中的应用。
[Abstract]:Cholesteric liquid crystals can be self-assembled to form spiral structures with selective reflectivity, I. e. Bragg-Bragg-reflection. By adding Guang Min chiral agent, the Bragg reflectance band movement of cholesteric liquid crystal device can be controlled reversible under light condition. Due to the influence of liquid crystal birefringence constant, the bandwidth of Bragg reflectance band is usually less than 100 nm, which limits the application of cholesteric liquid crystal in reflective devices. Broer and others have realized the broadening of Bragg reflectance band under illumination control, but the performance of the device is unstable. Irreversible regulation and so on. Due to the difference of the ratio and the optical control conditions of the liquid crystal devices needed to achieve different performance by optical control, so far, the research on the shift and broadening of the reflecting band of the bilayer liquid crystal (Bragg) has been carried out independently. The application of cholesteric liquid crystal is limited. In view of the above problems, the research contents of this paper include the preparation of novel Guang Min chiral azobenzene material Azo-Bi. and the characterization of its Guang Min and chiral properties. It was applied to the preparation of Guang Min bilayer liquid crystal device. The reversible control of the reflective band of cholesteric liquid crystal device was realized under the illumination condition. The effect of liquid crystal viscosity chiral agent on chiral properties of liquid crystal viscosity was studied. It was found that the chiral property of liquid crystal viscosity was higher in the liquid crystal with high viscosity. The HTP and AHTP values of chiral agents were higher. By comparing the moving rate of Bragg reflectance band and its stability in dark chamber with different viscosity under the same illumination condition, it is found that the light-controlled reversible regulation performance of bilirubin liquid crystal device with high viscosity is superior. And the stability in the darkroom is the best. 3) by controlling the illumination condition, the cholesteric liquid crystal wideband display device has been successfully fabricated. The reversible control of the reflected band position and band bandwidth is realized for the first time in the same liquid crystal display device by controlling the illumination condition. By studying the stability of liquid crystal wideband reflectors with different viscosity under the same illumination condition, the cholesteric liquid crystal wideband reflectors with stable properties have been successfully fabricated. Through the above research, the reversible control of the reflected band position and the reflectance band bandwidth is realized for the first time in the same liquid crystal display device by controlling the illumination condition. Red, green and blue display devices and black-white display devices with stable performance are fabricated. The precise and sensitive control of the Bragg reflectance band of phase liquid crystal by light control has been realized. The research in this paper will effectively expand the application of the remaining phase liquid crystal in the field of display.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN104.3

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