A new Sm 3+ doped yttrium oxysulfide phosphor, which has the long-lasting phosphorescence, was synthesized by flux fusion method. The phosphors showed three typical transitions of Sm 3+ ( 4G 5/2→ 6H J, J=5/2,7/2,9/2), and the emission peaks located at 570, 606 and 659 nm respectively. A prominent luminescence and phosphorescence in orange-red can be seen in this phosphor when illuminated with UV light or visible light. The synthesized phosphors were characterized by X-ray diffraction, the excitation and photoluminescence spectra, and the after-glow intensity decay curve. The result shows that the Y 2O 2S∶ Sm 3+ phosphor is another efficient orange-red phosphor.
The hexagonal born nitride based yellow afterglow phosphor was prepared by the rapid combustion method and its luminescent properties were characterized. The phosphor prepared at 800 ℃ for 30 min is with excellent luminescent performance. After irradiation by UV light, the yellow long-lasting phosphorescence can be observed for above 2 h in the limit of light perception of dark-adapted human eyes(0.32 mcd·m-2).
