Nanometric Scale X1-Y2SiO5∶Eu was prepared by sol-gel method with particle size about 50nm.The optical properties of the sample were investigated.Its luminescence spectra were recorded at room temperature and 15K using site selective excitation by a dye laser in addition to conventional UV excitation.Site selective excitation gave two sites for the Eu3+ ion in X1-Y2SiO5.These two sites differ significantly from each other as stated by their emission spectra.Wavelengths of the 5D0→7F0—4 transitions of the two sites were tabulated.Lifetimes of the 5D0 energy level were also measured. They are 3.00ms (site 1) and 2.18ms (site 2).