Patent ID: 6846350

Claim:
A red luminous ink composition comprising 0.1% to 3.0% by weight of a europium complex represented by the formula: wherein R 1 is a hydrogen atom or a substituent selected from the group consisting of an alkyl group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms and a halogen atom, R is a group selected from the group consisting of a fluorine-comprising alkyl group having from 1 to 20 carbon atoms, a substituted or unsubstituted alkyl group having from 1 to 6 carbon atoms, a substituted or unsubstituted aralkyl group having from 7 to 10 carbon atoms and a substituted or unsubstituted aryl group having from 6 to 12 carbon atoms, not less than 60% by weight of an alcoholic solvent, and 1 to 20% by weight of a solvent soluble resin selected from the group consisting of a polyvinyl resin, a polyamine resin and a polyacrylate resin.