Dichroic dye, liquid crystal composition containing dichroic dye and application of dichroic dye

The invention provides a dichroic dye, a liquid crystal composition containing the dichroic dye and application of the dichroic dye. The dichroic dye has a structure as shown in the following formula VII, is red, has the maximum absorption wavelength range of 580-680 nm, and has the advantages of high light stability, high dichroic ratio and high compatibility with liquid crystal materials. The liquid crystal composition containing the dichroic dye shown in the formula VII is colorless under the power-on condition, high in light transmittance, red after power-off, low in light transmittance, capable of still keeping red after long-time illumination and high in light stability, and can be used for manufacturing products such as dimming films, dimming glass, liquid crystal display elements or liquid crystal displays. 本发明提供了一种二向色性染料，包含有该二向色性染料的液晶组合物及其应用。该二向色性染料具有下式Ⅶ所示的结构，呈红色，最大吸收波长范围为580nm-680nm，具有光稳定性高、二向色比高，且与液晶材料相容性高。含有式Ⅶ所示的二向色性染料的液晶组合物在通电的情况下显示无色，光透过率高，断电后显示红色，光透过率低，长时间光照后仍然能够保持红色、光稳定性高，可以用来制造调光膜、调光玻璃、液晶显示元件