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Yttrium aluminum garnet doped with rare earth ions (Ce3+, Eu3+ and Sm3+) was   prepared by modified glycine method. Ce3+ as a dopant was used in four   different concentrations (Y3-xCexAl5O12; x(%) = 1, 2, 3, 5), while doping   concentration of Eu3+ and Sm3+ was Y3-xEuxAl5O12; x(%) = 3 and Y3-xSmxAl5O12;   x(%) = 1, respectively. Phase composition of powders was investigated using   XRD technique and expected target phase was confirmed. Photoluminescent   characterization included measurements of excitation and emission spectra, as   well as determination of emission decays. Y3-xCexAl5O12 shows intense   broad-band emission, with maximum in green spectral region, at about 524 nm   under ultraviolet or blue excitation. The origin of the luminescence is the   5d1→4f1 transition which is both parity and spin allowed. Ultraviolet and   blue excitations of Eu3+ and Sm3+ doped Y3Al5O12 produce intense orange and   red emissions. These emissions are phosphorescent in character and come from   spin forbidden f-f electron transitions in Eu3+ and Sm3+ ions. For the case   of Eu3+ doping emission comes mainly from 5D0→7F1 transitions with Stark   components peaking at 590 nm and 590.75 nm, and with emission decay of 4.15   ms. In the case of Sm3+ doping, the emission spectrum, shows 4G5/2→6H5/2,   4G5/2→6H7/2, and 4G5/2→6H9/2 transitions, with the most intense stark   components positioned at 567.5 nm, 617 nm, and 650 nm, respectively and for   transition centered at 617 nm, emission decay is 3.12 ms. [Projekat   Ministarstva nauke Republike Srbije, br. 171022 i br. 45012

Y3Al5O12:Re3+ (Re=Ce, Eu, and Sm) nanocrystalline powders prepared by modified glycine combustion method