A fluorescent labeling substance that is capable of realizing highly appropriate labeling through enhancing of the luminous efficiency of semiconductor nanoparticles or nanorods. The fluorescent labeling substance can be provided by disposing on a surface of shell of nanorods or nanoparticles having a modification group capable of adsorption with a biosubstance, such as protein, nucleic acid or antibody, a region devoid of the above modification group.
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