Abstract
A series of barium-tungstate-based phosphors doped with different concentrations of Dy3+ were synthesized by solid-state reaction method. Photoluminescence properties and decay lifetime of Dy3+-doped BaWO4 samples were studied. The results indicated that luminescent properties of BaWO4:Dy3+ depended on the Dy3+ concentration, and the inner energy could transfer from to Dy3+. The quality of the light was checked by estimating CIE parameters, and the results showed that BaWO4:Dy3+ was a potential candidate as blue-green luminescent materials in white LED because of its excellent emission spectrum excited by UV light.
Highlights
Metal tungstates have received much attention due to its luminescence properties, structure performance and its wide application in various fields [1]-[3]
The BaWO4 luminescent materials doped with Tb3+ or Eu3+ have been reported that they can be synthesized by a simple hydrothermal route, and show potential applications in the field of phosphor-converted white LEDs [10] [11]
The chromaticity coordinates are (0.3294, 0.3954), (0.3283, 0.3945), (0.3247, 0.3939), (0.3128, 0.3849), (0.3097, 0.3713) and (0.2946, 0.3657) corresponding with the increasing of Dy3+ concentration from x = 0 to 0.06
Summary
Metal tungstates have received much attention due to its luminescence properties, structure performance and its wide application in various fields [1]-[3]. Tungstate is rather promising for optoelectronic application in which it can emit blue light. Among these metal tungstates, barium tungstate with a tetragonal scheelite-like structure possesses good chemical and thermal stability [4]-[6]. The BaWO4 luminescent materials doped with Tb3+ or Eu3+ have been reported that they can be synthesized by a simple hydrothermal route, and show potential applications in the field of phosphor-converted white LEDs [10] [11]. Alkaline-earth metal tungstate AWO4 (A = Ca2+, Sr2+, Ba2+) was used to study as phosphor self-excited under UV excitation, exhibiting blue or green light [12]. A series of BaWO4 phosphors with different Dy3+ doping concentrations are prepared by solid state method and their photoluminescence properties are investigated under UV excitation
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