A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye characterised in that the dye comprises at least one anthraquinone compound free from water-solubilising and ionic substituents and having the formula:
wherein each of R and R' independently represents an n-alkyl group having from 4 to 7 carbon atoms inclusive and wherein each of R2 and R3 is independently selected from hydrogen and alkyl groups having from 1 to 4 carbon atoms inclusive.
一种适用于客-主液晶装置的材料,包括液晶材料和多色
染料的溶液,其特征在于
染料包括至少一种不含
水溶解性和离子取代基的
蒽醌化合物,并具有以下式子:其中 R 和 R' 各自独立地代表一个具有 4 至 7 个碳原子的正烷基,R2 和 R3 各自独立地选自氢和具有 1 至 4 个碳原子的烷基。