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Spherical nanocrystalline Y 2 O 3 :Er particles differing in composition and size, with a scatter in the range 10-15%, have been prepared through the low temperature thermolysis of an amorphous precursor. We have studied the luminescence, diffuse reflectance, and photoluminescence excitation spectra of Y 2 O 3 :Er nanoparticles differing in shape. The intensity of the visible luminescence bands of erbium doped yttria has been shown to depend on sphere diameter. The resonance wavelengths of coupled photons have been deter mined as functions of Y 2 O 3 :Er phosphor nanosphere size.