METHOD OF FORMING A RARE EARTH METAL DOPED NANOPARTICLE

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The present invention provides a method of forming a dispersible rare earth metal doped nanoparticle of a metal oxide. The method includes dissolving a salt of a rare earth metal in a mixture of (i) a surfactant and (ii) a suitable solvent. The solvent is at least essentially free of tri-n-octylphosphine oxide and at least essentially free of amines. The method includes adding to said solution a precursor of the metal oxide. The precursor of the metal oxide is added in an excess relative to the rare earth metal. The obtained solution is brought to a temperature selected in the range from about 200 °C to about 400 °C. At the temperature from about 200 °C to about 400 °C an amine is added. The amine is selected from an alkylamine and a dialkylamine.