染料掺杂的向列相液晶智能调光器件的开关态特性

提出了一种染料掺杂的向列相液晶智能玻璃器件的制作过程，并研究了它的开关态特性.先在上下两基板（ITO）上涂覆聚酰亚胺取向层，将液晶平铺在下基板上，再用带有密封胶框的上基板沿同一摩擦取向方向与下基板压合，制得向列相液晶器件.未加电场时，液晶在取向层的作用下形成平行与基板的多畴排列状态；施加电场后，液晶逐渐在电场作用转向，由平行于基板的多畴排列状态转变为垂直于基板的单畴排列状态，可见光在液晶器件中由散射转为透射，由关态转为开态，从而实现其明暗的切换.染料浓度与驱动电压共同影响器件的透射率.器件开关态阈值电压随器件厚度的增大而增大，在染料液晶浓度5%，盒厚30m时，器件的阈值电压为5 V,饱和电压为15 V，此时智能玻璃的透射率最高，明暗切换特性越好.

Switching Characteristic of Smart Light-Tunable Device Based on Dye-Doped Nematic Liquid Crystal

A light-tunable device based on dye-doped nematic liquid crystal is fabricated, and its switching characteristics are investigated. The cell is made by parallel arrangement of two glass with indium tin oxide (ITO) layer. Smart glass is made by filling the mixture of dye and nematic liquid crystal into cell. After applying an electric field, electric responsive nematic liquid crystal will align parallel to electric field. The rotation of liquid crystal molecule will give rise to the movement of the dye molecule. Meanwhile, distrubution of liquid crystal molecule will change from multidomain to monodomain, which induces smart glass state changing from scattering to transparency and achieving the function of dark-brightness switch. By varying the concentration of dye, driven voltage, the smart glass exhibits different performance. Threshold voltage of device rises while cell thickness goes up. Optimized performance will be obtained with the condition of 5% dye concentration, 30 m cell thickness, when threshold voltage is 5V, saturation voltage is 15 V.