Photoluminescence studies of gamma irradiated Y2O3:Eu3+ nanophosphor

Europium doped Y2O3 nanophosphor has been prepared by solution combustion method. The obtained phosphors were characterized by powder x-ray diffraction (PXRD).It reveals that the cubic crystalline phase of the material with an average crystallite size of 21 nm. Photoluminescence (PL) excitation spectra of gamma irradiated nanophosphors were recorded under the emission wavelength of 611 nm. PL excitation spectra reveal the distinct peaks at 252, 301, 321, 396 and 466 nm. Meanwhile, PL emission peaks at 534, 552 – 592, 611, 629-645, 687 and 710 nm were observed for excitation wavelength of 252 nm. The excitation and emission spectra of irradiated sample exhibits low intensity compared that of un-irradiated sample and found that its intensity increases up to 4.0 kGy of gamma dose and then decreases with further increase of dosage.