Y2O3 : RE NANOPARTICLES

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The invention provides Y2O3 : RE nanoparticles having a cubic crystal structure, wherein RE is a trivalent rare earth metal ion. The invention further provides a method of preparing Y2O3 : RE nanoparticles, comprising : a) providing a mixture comprising (i) an yttrium salt and/or yttrium alkoxide, (ii) a rare earth metal salt and/or rare earth metal alkoxide, and (iii) an organic solvent; b) optionally, subjecting the mixture to a pre-treatment step which comprises heating the mixture at a temperature of at least 80 °C and/or at a temperature such that crystal water and/or organic impurities are removed, c) heating the mixture at a temperature between 220 °C and 320 °C and/or at a temperature such that a precursor complex forms; d) subjecting the mixture to a precipitation stage, wherein a precipitate forms, said precipitation stage preferably comprising allowing the mixture to cool and/or adding an antisolvent to the mixture; and e) heating the precipitate at a temperature between 600 °C and 900 °C and/or at a temperature such that a cubic Y2O3 crystal structure forms, preferably for at least 10 minutes.