In the present work,a sol-gel method was employed to prepare nanosized SrAl2O4 powders doped with Eu3+ ions.The raw nano-materials were thermally treated at 900 to 1100 oC for 3 h.The XRD analysis demonstrated that the powders were single-phase nanopowders with high crystallite dispersion.Our studies were focused on relating the luminescence properties of the Eu3+ dopant to the NC(nanocrystal-lites) size.This was achieved by varying the calcinations temperature between 900 and 1100 oC.The average NC size varied accordingly be-tween ～36 and ～75 nm.We found that size effect manifested mainly in the expansion of the cell volume and broadening of XRD peaks as in-dicated by Rietveld analysis.Moreover the emission and excitation spectra,although typical for Eu3+ ions,demonstrated some degree of variability with calcinations temperature and doping concentration.To explain these differences a detailed analysis of luminescence spectra by the Judd-Ofelt theory was performed. In the present work, a sol-gel method was employed to prepare nanosized SrAl2O4 powders doped with Eu3 + ions. The raw nano-materials were thermally treated at 900 to 1100 oC for 3 h. The XRD analysis of that powders were single-phase nanopowders with high crystallite dispersion. Our studies were focused on the luminescence properties of the Eu3 + dopant to the NC (nanocrystal-lites) size. This was achieved by varying the calcinations temperature between 900 and 1100 oC. -tween ~ 36 and ~ 75 nm. We found that size effect manifested mainly in the expansion of the cell volume and broadening of XRD peaks as in-dicated by Rietveld analysis. Moreover the emission and excitation spectra, although typical for Eu3 + ions some degree of variability with calcinations temperature and doping concentration. To explain these differences a detailed analysis of fluorescence spectra by the Judd-Ofelt theory was performed.