Molten-salt synthesis and composition-dependent luminescent properties of barium tungsto-molybdate-based solid solution phosphors

Abstract

Pr3+-activated barium tungsto-molybdate solid solution phosphor Ba(Mo1−zWz)O4:Pr3+ is successfully fabricated via a facile molten-salt approach. The as-synthesized microcrystal is of truncated octahedron and exhibits deep-red-emitting upon blue light excitation. Powder x-ray diffraction and Raman spectroscopy techniques are utilized to investigate the formation of solid solution phosphor. The luminescence behaviors depend on the resulting composition of the microcrystals with fixed Pr3+-doping concentration, while the host lattices remain in a scheelite structure. The forming solid solution via the substitution of [WO4] for [MoO4] can significantly enhance its luminescence, which may be due to the fact that Ba(Mo1−zWz)O4:Pr3+ owns well-defined facets and uniform morphologies. Owing to its properties of high phase purity, well-defined facets, highly uniform morphologies, exceptional chemical and thermal stabilities, and stronger emission intensity, the resulting solid solution phosphor is expected to find potential applications in phosphor-converted white light-emitting diodes (LEDs).

Crystal growth, structure and optical properties of Pr3+-doped yttria-stabilized zirconia single crystals*

“…[4] Among the lanthanide ions, Pr 3+ has a wide range of emission characteristics in both the visible and infrared regions, and visible laser output has been reported in numerous Pr-doped hosts. [5][6][7][8] In addition, the emission band of Pr 3+ includes RGB components, which in principle can emit white light with the aid of other ions. [9] Pr 3+ absorbs in the blue light region with a cross-section up to 10 −19 cm 2 , and energy absorbed in the blue region by Pr 3+ produces transitions at multiple wavelengths corresponding to blue-green to deep red light.…”