Spectral emission of rare earth (Tb, Eu, Dy) doped Y2Sn2O7 phosphors
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Radioluminescence (RL) characterization of the yttrium stannate (Y2Sn2O7) phosphors doped with 1 mol % Tb, Eu and Dy was carried out and significant electronic transitions corresponding to doped rare earth ions were observed. It was seen that all parts of these rare earth ions are included in the phosphor material in their trivalent state. The RL measurement indicates that the series of the emission-state D-5(4)-> F-7(6), D-5(4)-> F-7(4), D-5(4)-> F-7(3), corresponding to the characteristic 4f -> 4f intra-configuration forbidden transitions of Tb(3+)are appeared and that main emission peak occurs at about 542 nm. There are in fact multiple emission lines at each of these due to the crystal field splitting of the ground state of the emitting ions. Eu-doped Y2Sn2O7 sample displayed intense and predominant emission peaks located at 580-650 nm corresponding to the D-5(0)->(7)Fj (j=1, 2, 3 and 4) transitions. Red emission coming from the hypersensitive Dy doped phosphor presented luminescence emissions with dominating transitions at (4)Fw(9/1) -> H-6(j)(j=9/2, 11/2,13/2 and 15/2). The sharp emission properties show that the Y2Sn2O7 is a suitable host for rare-earth ion doped phosphor material. (C) 2013 Elsevier B.V. All rights reserved.