TITANIUM DIOXIDE PARTICLE DOPED WITH RARE EARTH ELEMENT AND METHOD FOR PRODUCING SAME

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Disclosed is a titanium dioxide particle which enables to take out fluorescence of a rare earth element highly efficiently. Specifically disclosed is a titanium dioxide particle wherein a titanium site is substituted with a rare earth element. Also specifically disclosed is a method for producing such a titanium dioxide particle. A method for producing a titanium dioxide particle doped with a rare earth element comprises a step for preparing a liquid precursor containing a titanium source and a rare earth metal source wherein the amount of rare earth element in the rare earth metal source is more than 0 at% and not more than 5.0 at%, a step for generating a thermal plasma, and a step for introducing the liquid precursor into the thermal plasma.