A composition for use in an electro-optical device, particularly a display device, contains anthraquinone pleochroic dye of formula (I): ##STR1## where R.sub.1 is a substituted or unsubstituted amino group or a hydroxy group; each of R.sub.2, R.sub.3 and R.sub.4, which are identical or different, is a hydrogen atom, a substituted or unsubstituted amino group, a hydroxy group or a nitro group; R is a hydrogen or halogen atom or a hydroxy, lower alkyl or lower alkoxy group; n is 1, 2, 3 or 4, the Rs being identical or different when n is 2, 3 or 4; X is a hydrogen or halogen atom, a hydroxy or mercapto group, a straight, branched or cyclic C.sub.1-16 alkyl radical, a substituted or unsubstituted aryl group or a group of formula ##STR2## where R' is a hydrogen atom or a straight, branched or cyclic C.sub.1-10 alkyl residue, and Y is a hydrogen atom or a side chain of the formula: ##STR3## where X', R" and n' have the same definitions as and are respectively identical to or different from X, R and n, the side chain being in position 6 when the compound is substituted in position 2 and in position 7 when it is substituted in position 3. Compounds of formula (I) have a high order parameter and are very stable.
一种用于电光设备,特别是显示设备的组合物,包含公式(I)的
蒽醌偏光
染料:##STR1##其中,R.sub.1是取代或未取代的
氨基基团或羟基;R.sub.2,R.sub.3和R.sub.4分别相同或不同,是氢原子,取代或未取代的
氨基基团,羟基或硝基;R是氢或卤素原子或羟基,较低的烷基或较低的烷氧基;n为1、2、3或4,当n为2、3或4时,Rs相同或不同;X是氢或卤素原子,羟基或巯基,直链、支链或环状的C.sub.1-16烷基基团,取代或未取代的芳基基团或公式##STR2##的基团,其中R'是氢原子或直链、支链或环状的C.sub.1-10烷基残基,Y是氢原子或具有公式的侧链:##STR3##其中,X',R"和n'的定义与X,R和n相同或不同,侧链在化合物取代在位置2时位于位置6,在取代在位置3时位于位置7。公式(I)的化合物具有高的序参量并且非常稳定。