Luminescence of monoclinic Y2O3:Eu nanophosphor produced via laser vaporization

Europium doped Y(2)O(3)spherical nanoparticles with the diameter similar to 10 nmobtained via cw laser vaporization are shown to crystallize in monoclinic symmetry class (C2/m space group). The size of nanoparticles established via HRTEM coincides with coherent scattering region established by XRD. Luminescence spectrum in the vicinity of ultranarmw transition demonstrates three peaks consistent with three inequivalent positions of Eu3+ ion in monoclinic Y2O3 lattice. Hypersensitive transition dominates in the spectrum, admitting the lack of inversion symmetry at C-s sites occupied by Eu3+. The spectrum of hypersensitive transition is expanded to the red part of spectrum due intense transitions terminating at higher-lying components of crystal-field-split F-7(2) energy level. Obtaining chromaticity coordinates (0.669, 0.331)and absolute quantum yield (similar to 21%) is possible using red phosphor based on monoclinic Y2O3:Eu3+.