Fluorescent liquid crystals
AssigneeRCA Corporation
InventorRobert Dean Larrabee
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Abstract
Liquid crystal compositions compositions and liquid crystal thermometric articles, radiation sensors, and optical display devices comprised of a nematic liquid crystal solvent which is effectively transparent to radiation of near ultraviolet and visible wavelengths and a fluorescent solute whose visible fluorescent intensity varies with the phase or orientation of the liquid crystal solvent are disclosed.
Claims5
A composition which exhibits fluorescent intensity variations at its solid to mesomorphic or mesomorphic to isotropic phase transition comprising a solution of one or a mixture of liquid crystal compounds of the formula ##SPC7##
- wherein R is C.sub.n H.sub.2n.sub.+1 -- or C.sub.n H.sub.2n.sub.+1 CO-- and n is an integer from 1-10 and an amount of 2, 4, 6-trimethylpyridinium tetrakis [1, 1, 1-trifluoro-4-(p-trifluoromethylphenyl)-2, 4-butenedioxo] europium III effective to induce said variations.
Dependencies are inferred from the claim text.