改变直流电场方向调控聚合物稳定胆甾相液晶的反射带隙  

Modulation of reflection band in polymer-stabilized cholesteric liquid crystals by changing DC electric field direction

作　　者：张欣敏 陆红波[1] 王琦[1,2] 王藏玉 徐苗 朱俊 邱龙臻[1] ZHANG Xin-min;LU Hong-bo;WANG Qi;WANG Cang-yu;XU Miao;ZHU Jun;QIU Long-zhen(National Engineering Laboratory of Special Display Technology, State Key Laboratory of Advanced Display Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei 230009, China;School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]合肥工业大学特种显示技术国家工程实验室先进显示技术国家重点实验室安徽省特种显示与成像技术创新中心光电技术研究院,安徽合肥230009 [2]合肥工业大学化学与化工学院,安徽合肥230009

出　　处：《液晶与显示》2021年第8期1075-1083,共9页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.61805066);安徽省自然科学基金(No.1708085MF150);安徽省杰出青年基金(No.1808085J03);中央高校基础研究基金(No.JZ2018HGPB0276)。

摘　　要：具有宽带反射特性的胆甾相液晶在众多领域有广泛的应用前景。为了拓展调控反射带隙的方法,实现在所需波谱范围内的带隙调控,本文通过添加紫外吸收染料,制备了一种聚合物网络梯度分布的新型聚合物稳定胆甾相液晶器件。实验结果表明,聚合物网络的梯度分布使液晶盒上下表面附近的聚合物网络弹性产生了显著的差异,因此,其电诱导的反射带隙拓宽可以改变直流电场的方向进行调谐。当液晶盒厚度为40μm,染料浓度为1.2%的PSCLC,在施加12 V的直流电场时,面向光源为正极时的反射带隙位于570~778 nm,改变电场方向后,反射带隙红移至598~816 nm。这项研究为宽带反射胆甾相液晶材料提供了一种新的策略,在智能窗户、激光防护、数据存储等方面具有潜在的应用。Cholesteric liquid crystals with broadband reflection properties have a wide range of applications in many fields.In order to expand the method of modulating the reflection band and achieve band modulation in the desired spectral range,a new polymer-stabilized cholesteric liquid crystal device with polymer network gradient distribution is prepared by adding UV-absorbing dyes.The experimental results show that the gradient distribution of polymer network makes a significant difference in the elasticity of polymer network near the upper and lower surfaces of the cell,so that its electrically induced reflection band broadening can be tuned by changing the direction of the direct current electric field.When the cell thickness is 40μm and the dye concentration is 1.2%of PSCLC,the reflective band facing the light source as the positive pole is located at 570~778 nm when a 12 V DC electric field is applied,and the reflective band is red-shifted to 598~816 nm after changing the electric field direction.This research provides a new strategy for broadband reflective cholesteric liquid crystal materials that have potential applications in smart windows,laser protection,data storage,etc.

关 键 词：聚合物稳定胆甾相液晶 宽带反射 直流电场方向 反射带隙调控 

分 类 号：O753.2[理学—晶体学] TN29[电子电信—物理电子学]