聚合物稳定胆甾相液晶的低压致反射带隙展宽  

Reflection band gap broadening of polymer-stabilized cholesteric liquid crystal by low voltage

作　　者：高文慧 郭瑞彩 李小帅 张美珊 孙玉宝[1] GAO Wen-hui;GUO Rui-cai;LI Xiao-shuai;ZHANG Mei-shan;SUN Yu-bao(Department of Applied Physics,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学应用物理系,天津300401

出　　处：《液晶与显示》2022年第8期997-1007,共11页Chinese Journal of Liquid Crystals and Displays

基　　金：国家重点研发计划(No.2018YFB0703701);国家自然科学基金(No.61475042)。

摘　　要：胆甾相液晶(CLC)的反射带隙通常在50~100 nm之间,为增强胆甾相液晶的实用性,可通过施加外部刺激拓宽其反射带隙。具有负介电各向异性的聚合物稳定胆甾相液晶(PSCLC)在直流电压作用下聚合物网络会发生运动,导致反射带隙展宽,而此过程通常需要较大的驱动电压。本文研究了聚合物单体浓度、液晶盒厚度和紫外吸收染料含量对反射带隙展宽程度的影响,制备得到的PSCLC反射带隙最高可实现3倍展宽效果,所需驱动电压低至7.5 V,且撤掉驱动电压后,PSCLC系统会迅速恢复其原始光学特性,呈现出良好的可逆性变化。The reflection band gap of cholesteric liquid crystal(CLC)is usually between 50 and 100 nm.To enhance the usefulness of CLC,the external stimulation can be applied to broaden the reflection bad gap.The polymer network can be moved by the action of direct current voltage in polymer-stabilized cho⁃lesteric liquid crystal(PSCLC)with negative dielectric anisotropy,results in broadening the reflection band gap,which is usually driven by a large voltage.In this paper,the influence of polymer monomer’s concentration,cell thickness of liquid crystal,and ultraviolet absorption dye on the reflection band was studied.The reflection band of PSCLC is broadened by 3 times,and the required driving voltage is low⁃ered to 7.5 V.After the driving voltage is removed,PSCLC system quickly returns to the original optical performance,shows the good reversible change.

关 键 词：聚合物稳定胆甾相液晶 电调谐 反射带隙 低电压 

分 类 号：O753.2[理学—晶体学]