Hydrothermal Synthesis and Luminescence Properties of Novel Red Y1−xEuxW2O6(OH)3 Phosphors
Novel red Y1−xEuxW2O6(OH)3 phosphors (x=0, 0.2, 0.4, 0.6, 0.8, 1) were synthesized via a facile hydrothermal method at 180°C for 24 h. The results of X-ray powder diffraction patterns indicate that as-synthesized phosphors have a monoclinic structure without any impurity phase. The microstructure characterization shows that the Eu3+ content has a remarkable influence on the morphologies of as-obtained samples. With the increasing Eu3+ content, the sample morphology tends to be spherical. The emission spectra under 394 nm excitation exhibit dominant peaks centered at 617 nm, corresponding to the 5D0→7F2 transition of Eu3+. The high ratio of the red emission at 617 nm to the orange emission at 593 nm makes Y1−xEuxW2O6(OH)3 phosphors a potential candidate for red-emitting light-emitting diode phosphors. The emission intensity of the phosphors increases with Eu3+ doping concentration. The 5D0→7F2 emission intensity of EuW2O6(OH)3 is about 3.5 times stronger than that of Y0.8Eu0.2W2O6(OH)3. Furthermore, the life time were discussed.
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Document Type: Research Article
Publication date: 2010-09-01