Importance

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Abstract

The invention contains a resin and a near infrared fluorescent material which is one type or two or more types of compounds selected from General Formulas (I₁) to (I₄) and has a maximum fluorescence wavelength of 650 nm or longer. In Formulas, R^a and R^b, R^c and R^d, R^h and Rⁱ, and R^j and R^k form rings together with the nitrogen atom to which R^a, R^c, R^h, and R^j are bonded; R^e and R^f represent a halogen atom or an oxygen atom; each of R^l, R^m, Rⁿ, and R^o independently represents a halogen atom, a C_1-20 alkyl group, a C_1-20 alkoxy group, an aryl group, or a heteroaryl group; R^g, R^r, and R^s represent a hydrogen atom or an electron withdrawing group; and each of R^p and R^q independently represents a hydrogen atom, a halogen atom, a C_1-20 alkyl group, a C_1-20 alkoxy group, an aryl group, or a heteroaryl group.

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First Claim