INK COMPOSITION AND PRINTED MATTER
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United States of America Patent
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Nov 12, 2020
app pub date -
Jun 1, 2018
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Sep 15, 2017
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Abstract
An ink composition comprising: a rare-earth complex containing one kind of trivalent rare-earth ion selected from the group consisting of Eu3+, Tb3+, Sm3+, Er3+, Pr3+, Ho3+, Tm3+ and Dy3+, and a specific phosphine oxide ligand coordinated to the rare-earth ion, and a light-emitting material different from the rare-earth complex, wherein an absolute value of a difference between a wavelength (λ1) at which a light emission intensity of the rare-earth complex is maximum and a wavelength (λ2) at which a light emission intensity of the light-emitting material is maximum, is 50 nm or more.
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