INK COMPOSITION

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Disclosed is an ink composition comprising a microparticulate phosphor which can emit a high-brightness fluorescent light by ultraviolet ray and has a predetermined nanosize. The ink composition comprises a microparticulate phosphor represented by the formula : YVO4 : A [wherein A represents a rare earth metal other than yttrium] and capable of emitting a fluorescent light upon the excitation with ultraviolet ray.  The phosphor has an average primary particle diameter of 30 to 400 nm and is not burned.  The phosphor can be produced by, for example, mixing and reacting a composition (I) comprising an yttrium compound, a compound of a rare earth metal other than yttrium and a complex-forming compound in water with a composition (II) comprising a vanadium compound in water.