Abstract: Provided is an alkoxysilyl group-containing organic EL dye that can be used for the production of fluorescent silica particles that do not fade. This alkoxysilyl group-containing organic EL dye is represented by the general formula X—Y-Q-Z—Si(R1)n(OR2)3-n, wherein X is an organic EL dye, Y is a direct bond or —(CH2)p— (p represents an integer from 1 to 10) or —(O—CH2CH2)q— (q represents an integer from 1 to 10), Q is a bond selected from the group consisting of amide bond, ether bond, thioether bond, thioester bond, thiourea bond, disulfide bond, and polyoxyethylene bond, Z is —(CH2)3— or —(CH2)2NH(CH2)3—, R1 and R2 represent an alkyl group having 1 to 7 carbon atoms, and n represents 0 or 1.

Abstract: There is provided a fluorescent dye which can improve the fluorescent intensity at the time of labeling to thereby detect a biomolecule with higher sensitivity. The fluorescent dye of the present invention includes a nitrogen cation-containing group or a nitrogen-containing group. Its high water solubility can improve the rate of labeling for a biomolecule to thereby detect a biomolecule with high sensitivity.

Abstract: There is provided a fluorescent dye which can improve the fluorescent intensity at the time of labeling to thereby detect a biomolecule with higher sensitivity. The fluorescent dye of the present invention includes a nitrogen cation-containing group or a nitrogen-containing group. Its high water solubility can improve the rate of labeling for a biomolecule to thereby detect a biomolecule with high sensitivity.

Abstract: A red fluorescence conversion composition includes a color conversion material (A) which absorbs light in a blue region and emits light having a fluorescence emission maximum in yellow-orange regions; a color conversion material (B) which absorbs light in the yellow-orange regions and emits light having a fluorescence emission maximum in the red region; and a matrix resin (C) for dispersing the color conversion materials (A) and (B). The color conversion material (A) is a condensed polycyclic compound made of a 5-membered ring compound having a conjugated system, and a 6-membered ring compound having a conjugated system with the 5-membered ring compound. The 5-membered ring compound contains at least one kind of atom selected from a hetero atom, a selenium atom, and a boron atom. A red fluorescence conversion film is made of the composition.