A novel white emission in Ca8MgBi(PO4)7:Dy3+ single-phase full-color phosphor

Novel single-phase white-light-emitting Ca8MgBi(PO4)(7):xDy(3+) (x = 0.02, 0.04, 0.06, 0.08, 0.12, 0.20, and 0.30) phosphors for light-emitting diode (LED) applications were synthesized by conventional solid-state reactions, and the phases and luminescent properties were well characterized. The results show that the excited bands of the phosphor are centered at 324 nm (H-6(15/2) -> M-4(17/2)), 350 nm (H-6(15/2) -> M-4(15/2), P-6(7/2)), 366 nm (H-6(15/2) -> I-4(11/2)), 387 nm (H-6(15/2) -> I-4(13/2), F-4(7/2)), 427 nm (H-6(15/2) -> (4)G(11 2)), and 448 nm (H-6(15/2) -> I-4(15/2)) wavelengths. On excitation at 350 nm, the emission transitions of Dy3+ ions consisted of double emission bands, which can be attributed to the F-4(9/ 2) -> H-6(15/2) (480 nm) and F-4(9/2) -> H-6(13/2) (572 nm) transition emissions. The phosphor developed in this study has great potential as a single-component white-light-emitting phosphor for UV-LEDs. (C) 2014 Elsevier B. V. All rights reserved.