LAUSR

Abstract Tm 3+ and Dy 3+ co-doped Ba 0.05 Sr 0.95 WO 4 phosphors were synthesized by a low temperature combustion method. The structures of the samples were SrWO 4 phase and were identified by X-ray diffraction. The surface topographies of Ba 0.05 Sr 0.91 WO 4 : 0.01Tm 3+ 0.03Dy 3+ were tested by scanning electron microscope. The particles were ellipsoid, and their average diameter was approximately 0.5 μm. The emission spectra of Ba 0.05 Sr 0.95 WO 4 : Tm 3+ showed a peak at 454 nm which belonged to the 3 H 6 → 1 D 2 transition of Tm 3+ , and the optimum doping concentration of Tm 3+ ions was 0.01. The emission spectra of Ba 0.05 Sr 0.95 WO 4 : Dy 3+ consisted of the 4 F 9/2 → 6 H 13/2 dominant transition located at 573 nm, the weaker 4 F 9/2 → 6 H 15/2 transition located at 478 and 485 nm, and the weakest 4 F 9/2 → 6 H 11/2 transition located at 660 nm, and the optimum doping concentration of Dy 3+ ions was 0.05. A white light was achieved from Tm 3+ and Dy 3+ co-doped Ba 0.05 Sr 0.95 MoO 4 crystals excited at 352-366 nm. With the doping concentration of Tm 3+ fixed at 0.01, the luminescence of Ba 0.05 Sr 0.95 MoO 4 : Tm 3+ Dy 3+ was closest to standard white-light emissions when the concentration of Dy 3+ was 0.03; the chromaticity coordinates were (0.321, 0.347), and the color temperature was 6000 K.