| abstract |
ABSTRACT OF THE DISCLOSURE A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a formula: Formula (I) wherein: R represents a group selected from optionally substituted alkyl and optionally substituted monocyclic aryl; Q represents a group selected from halo, OH, -NO2, alkyl, aryl and -NR1R2, wherein each of R1 and R2 independently represents a group selected from H, alkyl and aryl; x represents an integer from 1 to 4; and y represents an integer from 0 to 4; x + y being in the inclusive range 2 to 8. |