INK COMPOSITION, PRINTED MATTER, AND AUTHENTICITY DETERMINATION METHOD

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An ink composition containing one or more rare earth complexes including trivalent rare earth ions and at least one organic ligand selected from β-diketone ligands, carboxylic acid ligands, phosphine oxide ligands, and nitrogen-containing aromatic heterocyclic ligands. The trivalent rare earth ions included in the one or more rare earth complexes include at least one selected from group A below and at least one selected from group B below. Group A : Eu3+, Sm3+, Pr3+, and Ho3+; group B : Tb3+, Er3+, Tm3+, Dy3+, Yb3+, Nd3+, Ce3+, and Gd3+