Uniformly encapsulated nanoparticles, and light emitting material and optoelectronic device including same

A composite particle comprising a plurality of nanoparticles consisting of an inorganic material encapsulated in an oxide material,

• wherein the plurality of nanoparticles is uniformly dispersed in said oxide material;
• wherein the loading charge of nanoparticles in a composite particle is at least 15%, said loading charge being the mass ratio between the mass of nanoparticles comprised in a composite particle and the mass of said composite particle;
• and
• wherein the oxide material is selected from the group consisting of SiO2, Al2O3, TiO2, ZrO2, ZnO, MgO, SnO2, Nb2O5, CeO2, BeO, IrO2, CaO, Sc2O3, NiO, Na2O, BaO, K2O, PbO, Ag2O, V2O5, TeO2, MnO, B2O3, P2O5, P2O3, P4O7, P4O8, P4O9, P2O6, PO, GeO2, AS2O3, Fe2O3, Fe3O4, Ta2O5, Li2O, SrO, Y2O3, HfO2, WO2, MoO2, Cr2O3, TC2O7, ReO2, RuO2, CO3O4, OsO, RhO2, Rh2O3, Pto, Pdo, CuO, Cu2O, CdO, HgO, Tl2O, Ga2O3, In2O3, Bi2O3, Sb2O3, PoO2, SeO2, CS2O, La2O3, Pr6O11, Nd2O3, La2O3, Sm2O3, Eu2O3, Tb4O7, Dy2O3, HO2O3, Er2O3, Tm2O3, Yb2O3, Lu2O3, Gd2O3, and mixtures thereof, with the proviso that the oxide material does not consist of pure Sio2.