Synthesis and photoluminescence properties of NaLaMgWO6:RE3+ (RE=Eu, Sm, Tb) phosphor for white LED application

Abstract Single phase of NaLa 1− x MgWO 6 : xRE 3+ (0 x ≤1) ( RE = Eu, Sm, Tb) phosphors were prepared by solid-state reaction method. X-ray diffraction, scanning electron microscopy, the morphology energy-dispersive X-ray spectroscopy, UV–vis diffuse reflectance spectra and photoluminescence were used to characterize the samples. Under the light excitation, NaLaMgWO 6 :Eu 3+ , NaLaMgWO 6 :Sm 3+ and NaLaMgWO 6 :Tb 3+ , phosphors showed the characteristic emissions of Eu 3+ ( 5 D 0 → 7 F 4, 3, 2, 1 ), Sm 3+ ( 4 G 5/2 → 6 H 5/2, 7/2, 9/2 ), and Tb 3+ ( 5 D 4 → 7 F 6, 5, 4, 3 ), respectively. The intensity of the red emission for Na(La 0.6 Eu 0.4 )MgWO 6 is 2.5 times higher than that of (Y 0.95 Eu 0.05 ) 2 O 3 under blue light irradiation. The quantum efficiencies of the entitled phosphors excited under 394 nm and 464 nm are also investigated and compared with commercial phosphors Y 2 O 3 :Eu 3+ , Sr 2 Si 5 N 8 :Eu 2+ and Y 3 A 5 G 12 :Ce 3+ . The results demonstrated NaLaMgWO 6 : RE 3+ phosphors as potential candidates for white light emitting diode pumped by UV or blue chip.