Abstract
Y2-x(MoO4)3-y(BO3)y:xSm3+ and Y2-x(MoO4)3-y(PO4)y:xSm3+ orange-red phosphors were synthesized using a conventional solid-state reaction. The effects of Sm3+ doping concentration and substitution by anion groups BO33− and PO43− on the crystal structure and luminescent performance were studied in detail. XRD results indicated that all samples had a standard Y2(MoO4)3 structure with space group Pbcn, and BO33− and PO43− entered the lattice without initiating an impurity phase. At an excitation of 404 nm, the Y2-x(MoO4)3:xSm3+ orange-red phosphors exhibited three narrow-band emissions at 567 nm, 605 nm, and 652 nm, due to transitions of 4G5/2 → 6H5/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2 of Sm3+, respectively. In addition, substitution of MoO42− by BO33− and PO43− resulted in significant improvement of the luminescence of the Y2(MoO4)3-y(BO3)y:Sm3+ and Y2(MoO4)3-y(PO4)y:Sm3+ phosphors compared to Y2(MoO4)3:Sm3+ phosphors, especially in terms of luminescent intensity. The results indicated that Y1.9(MoO4)2.97(BO3)0.03:0.1Sm3+ and Y1.9(MoO4)2.94(PO4)0.06:0.1Sm3+ orange-red phosphors, having excellent luminescence, are promising orange-red components for warm white light-emitting diodes.
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