| abstract |
A guest-host liquid crystal dye mixture comprising a calamatic, thermotropic liquid crystal as host and a dichroic fluorescent dye as guest, characterized in that the dichroic fluorescent dye is a multichromophoric dye containing at least a group with the general formula Ry - X 1 - C 1 , wherein Ry is a chromophore from the rylene family, C 1 is a second chromophore and X 1 is a spacer that interrupts the conjugation between Ry and C 1 , the spacer X 1 is selected such that it introduces rigidity against bending or folding over an axis perpendicular to the length of the molecule. |