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Nanocrystalline powders of Eu3+doped Gd3Ga3Al2O12(GGAG) were prepared using modified Pechini method. The nanocrystals with the size from tens to hundreds nanometres were obtained. For growth of single crystal GGAG:Eu the Czochralski method was utilized. The crystal structure, grains morphology and optical properties of GAGG doped with different concentration of Eu3+ and calcined at different temperatures were investigated and discussed. The impact of grain size and Eu3+concentration on the spectroscopic properties of Gd3Ga3Al2O12:Eu3+was checked and analyzed. The spectroscopic properties of the nanopowders were compared to the Gd3Ga3Al2O12:Eu3+single crystal. The influence of effective index of refraction was taken into account in the analysis of transition rates of metastable multiplet and it was found that grain size (surface area) of the nanocrystals has huge impact on the luminescence decay time

The Czochralski growth of Dy3+-doped (Lu1−xGdx)2SiO5solid solution single crystals with different mixtures of Lu2SiO5and Gd2SiO5oxides (x= 0, 0.2, 0.4, 0.6, 0.8, and 1) is reported. It was found that the (Lu1−xGdx)2SiO5crystals retain structural, physical, and optical properties of Lu2SiO5even for x= 0.8. Optical investigation of Dy:(Lu1−xGdx)2SiO5revealed that the structural disorder of the host brings about a strong inhomogeneous broadening of Dy3+spectral bands while influencing weakly rates of its radiative and nonradiative transitions. Dielectric characteristics of solid solution crystals are presented and discussed. Finally, (Lu1−xGdx)2SiO5solid solution crystals seem to be an attractive alternative to a Lu2SiO5host for the design of novel phosphors, radiation converters, and lasers owing to a significantly lower melting temperature and hence easier and less expensive manufacturing.