INK COMPOSITION AND PRINTED MATTER

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Provided is an ink composition containing : a rare earth complex containing one trivalent rare earth ion selected from the group consisting of Eu3+, Tb3+, Sm3+, Yb3+, Nd3+, Er3+, Pr3+, Ho3+, Tm3+, Dy3+, Ce3+, and Gd3+ and at least one organic ligand selected from a β-diketone ligand, a carboxylic acid ligand, a phosphine oxide ligand, and a nitrogen-containing aromatic heterocyclic ligand; and a long-afterglow luminescent material having an afterglow time of 1 second or more after excitation light irradiation is stopped.