Dy3+-doped N3Gd(PO4)(2) phosphors were synthesized by high temperature solid-state reaction. The X-ray diffraction patterns and Fourier transform infrared absorption measurements were performed to characterize the synthesized phosphors. The excitation and emission spectra of Gd3+ and Dy3+ in Na3Gd(PO4)(2) : Dy3+ were detected in the wavelength region from UV to visible. With increasing Dy3+ concentration, the Gd3+ emission at 313 nm due to the P-6(7/2) -> S-8(7/2) transition decreases, while blue and green emissions due to the Dy3+ -> F-4(9/2) H-4(15/2), (13/2) transitions increase under excitation into the Gd3+ I-6(7/2) Level. The results indicate that the efficient energy transfer occurs from Gd3+ to Dy3+ in N3Gd(PO4)(2) : Dy3+.

Keywords: luminescence; Gd3+ ions; Dy3+ ions; Energy transfer; Phosphates; N3Gd(PO4)(2)