Ink composition, its use, and printed matter

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An ink composition which is suitable for inkjet printing, comprises 0.001 wt.-% to 15 wt.-% of a rare earth complex of the formula, in which ‘Ln’ represents one or more trivalent rare earth cations chosen from the group consisting of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, preferably chosen from the group consisting of Eu, Gd, and Tb, ‘n’ is preferably three, ‘S’ is a C5-C6 heteroaryl, preferably a pyridyl, ‘Y’ is a diaza heterocycle, preferably an imidazolyl, particularly preferably a functionalized benzimidazolyl, ‘Z’ is either hydrogen or a functional group chosen from the group consisting of alkyl, aryl, sulfonyl, and halogen, ‘x’=1 or any desired natural number.