Concentration dependent luminescence spectral investigation of Sm3+ doped Y2SiO5 nanophosphor

Sm3+ doped Y2SiO5 was prepared by a simple solution combustion synthesis using (oxalyl dihydrazide) ODH as a fuel. The prepared material was well characterized by the PXRD, FTIR, UV-Vis and SEM. SEM data reveals highly aggregate mass with highly porous structure. Photoluminescence studies for the prepared material show four prominent peaks at 561, 571, 600 and 646 nm, when excited at the wavelength 405 nm. These transitions are attributed to the intra 4f orbital change over from 4G5/2 level to the 6HJ. In the present study, it was observed that the transition 4G5/2 → 6H7/2 is the most intense transition, which is a consequence of both electric and magnetic dipole transition. Thermoluminescence experiments on γ-irradiated samples in the dose range of 300-600 Gy are studied. The (TL) glow curves intensity greatly depends on the size of the nanoparticles, surface area and duration of γ-exposure which was evident from the experimental data. TL intensity parameters such as activation energy, frequency factor and order of kinetics were evaluated using Chen's peak shape method to analyze the TL characteristics of the phosphor.