Recyclable CPL switch regulated by using an applied DC electric field from chiral nematic liquid crystals (N*-LCs),Materials Chemistry Frontiers

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Recyclable CPL switch regulated by using an applied DC electric field from chiral nematic liquid crystals (N*-LCs)
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-08-24 , DOI: 10.1039/d0qm00507j
Xiaojing Li _{1,

2,

3,

4} , Yihao Shen _{1,

2,

3,

4} , Kerui Liu _{2,

3,

4,

5,

6} , Yiwu Quan _{2,

3,

4,

5,

6} , Yixiang Cheng _{1,

2,

3,

4}

Affiliation

Two pairs of D–A type chiral binaphthyl dyes (R/S-M1 and R/S-M2) as CPL emitters were synthesized and doped into nematic liquid crystals (N-LCs, E7) to form chiral emissive nematic liquid crystals (N*-LCs). The resulting N*-LCs-2 with a smaller dihedral angle of the binaphthyl backbone can emit a strong CPL signal (g_em = −0.83/+0.86) compared with N*-LCs-1 (g_em = −0.20/+0.26) due to the high helix twist power (HTP) in the N*-LCs-2 system. Most importantly, recyclable CPL response behavior in N*-LCs could be observed by using the applied direct current (DC) electric field with the electric phase transition effect (EPT) through texture change from the planar texture into focal conic texture, and then the uniformly-lying helical texture (ULH state). This kind of “on–off–on” system based on DC electric field can adjust the g_em value and direction of CPL in N*-LCs. This work can provide a novel strategy for developing a novel CPL device on N*-LCs through the applied DC electric field.

中文翻译：

通过使用来自手性向列液晶（N * -LC）的施加的直流电场来调节可回收CPL开关

合成了两对作为CPL发射体的D–A型手性联萘染料（R / S -M1和R / S -M2）并掺杂到向列液晶（N-LCs，E7）中，形成手性发射向列液晶（N * -LC）。与N * -LCs-1（g _em）相比，所得的N * -LCs-2具有较小的联萘骨架的二面角，可以发出较强的CPL信号（g _em = -0.83 / + 0.86）= -0.20 / + 0.26），这是由于N * -LCs-2系统中的高螺旋扭曲功率（HTP）。最重要的是，可以通过将施加的直流（DC）电场与电相变效应（EPT）一起使用，将N * -LCs中的可回收CPL响应行为观察到，该电场具有通过从平面纹理到局部圆锥形纹理的纹理变化，然后通过均匀分布的螺旋纹理（ULH状态）。这种“开-关接通”系统基于DC电场可以调整克_EM在N * -LCs CPL的值和方向。这项工作可以为通过施加的直流电场在N * -LC上开发新型CPL器件提供一种新颖的策略。

更新日期：2020-10-02

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