| 摘要 |
PROBLEM TO BE SOLVED: To provide fluorophor nano particles which have a nano size suitable for a biological substance-labeling agent, emit rear infrared ray passing through "biological window", and have high ray-emitting accuracy, and to provide a biological substance-labeling agent using the same. SOLUTION: The near infrared ray-emitting fluorophor nano particles having an average particle diameter of 2 to 50 nm and emitting near infrared rays having wavelengths in a range of 700 to 2,000 nm, when excited with near infrared rays having wavelengths in a range of 700 to 900 nm, is characterized in that at least one portion of the composition is represented by the following general formula (1): A<SB>1-x-y</SB>Nd<SB>x</SB>Yb<SB>y</SB>PO<SB>4</SB>(wherein, A is an element selected from Y, Lu and La; 0<x≤0.5, 0<y≤0.5, x+y<1.0), and the fluorophor nano particles are dried, calcinated and produced by passing their raw materials through a spray calcination oven in a state dissolved in a solvent. COPYRIGHT: (C)2009,JPO&INPIT
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