NEAR INFRARED LIGHT-EMITTING FLUORESCENT NANOPARTICLE AND BIOLOGICAL LABEL USING THE SAME

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Provided is a fluorescent nanoparticle which is in a nano-size suitable for biological labels, emits near infrared light passing through a so-called biological window, and has a high light-emission accuracy. Also, provided is a biological label using the same. The near infrared light fluorescent nanoparticle as described above is an infrared light-emitting fluorescent nanoparticle having an average particle size of 2 to 50 nm and emitting near infrared light of a wavelength ranging from 700 to 2000 nm when excited by near infrared light of a wavelength ranging from 700 to 900 nm, characterized by at least a part of the composition thereof being represented by the following general formula (1) APO4 or (2) AF3 (wherein A represents at least one element selected from the group consisting of Y, Lu and La), being doped with at least one kind of rare earth metal, and being modified at the surface thereof with polyethylene glycol having a terminal functional group.