Fluorescent probe and its manufacturing method

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This fluorescent probe is formed of a glass powder that contains rare earth element ions, which are excited by light having a wavelength in the near infrared region and emit light having a wavelength in the near infrared region other than the above-mentioned wavelength, in glass. This method for producing a fluorescent probe sequentially comprises : a melting step wherein a compound containing a rare earth element and a glass starting material are melted; a cooling step wherein the molten material obtained in the melting step is cooled, thereby producing a glass composition that contains rare earth element ions; and a crushing step wherein the glass composition is crushed, thereby obtaining a powder.