Effects of SO2−4 or SiO2−3 Doping on the Photoluminescence of NaEu(MoO4)2 Nanophosphors for Light-Emitting Diodes
Abstract:A series of red nanophosphors including NaEu(MoO4)2−x(SO4)x as well as NaEu(MoO4)2−x (SiO3)x (x = 0, 0.10, 0.20, 0.30, 0.40) were synthesized by hydrothermal and subsequent heat-treatment processes. The as-prepared pure and anion (SO2−4 or SiO2−3)-doped NaEu(MoO4)2 phosphors were indexed as a scheelite structure, which was revealed by X-ray diffraction data. The morphologies of SO2−4-doped NaEu(MoO4)2 powders were almost regularly spherical, and their grain sizes ranged from 300 to 400 nm. However, the grains of SiO2−3-doped phosphors appeared to be seriously inordinate and unconsolidated, as indicated by their scanning electron microscopy studies. All of the samples were excited with near-UV 395 nm light and showed the characteristic red emission of the Eu3+ 5D0 → 7F2 transition. With the incorporation of SO2−4 into the host, the red emission intensities of Eu3+ increased obviously and reached a maximum at x = 0.30. Nevertheless, the intensities of Eu3+ emission reduced dramatically after the SiO2−3 doping. The optimized NaEu(MoO4)1.70(SO4)0.30 nanophosphor powders, with well-distributed fine grains and strong emission intensity, may be applied in the fabrication of phosphor-converted light-emitting diodes (LEDs).
Document Type: Research Article
Publication date: March 1, 2010
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