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Preparation and Enhancement of Luminescent Intensity of New Rare Earth Molybdate NaLa(MoO4)2:Eu3+ Phosphors
Corresponding Author(s) : Yong-Qing Zhai
Asian Journal of Chemistry,
Vol. 26 No. 11 (2014): Vol 26 Issue 11
Abstract
Novel red-emitting rare earth molybdate phosphors NaLa(MoO4)2:Eu3+ have been successfully synthesized by sol-gel method assisted by microwave. The as-synthesized samples were characterized by means of Fourier transform infrared spectroscopy, X-ray diffraction and Fluorescence spectrophotometer, respectively. The results show that the target product NaLa(MoO4)2:Eu3+ have been synthesized by calcining precursor at 800 ºC. The obtained samples belong to tetragonal Scheelite-structure and I41/a space group. The excitation spectrum of NaLa(MoO4)2:Eu3+ has a broad band in the range of 250-350 nm and the main peak is at 301 nm. The broad band can be ascribed to the charge transfer band of Mo-O and Eu-O. The sharp lines in 350-500 nm range are due to 4f-4f transitions of Eu3+. The emission spectrum contains a series of narrow peaks, with the main peak at 616 nm originated from the electric dipole transition of 5D0 ® 7F2 of Eu3+. The appropriate doping amount of Bi3+ and flux NH4F can enhance luminescent intensity of the sample effectively.
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- X.H. He, J. Zhou, N. Lian, J.H. Sun and M.Y. Guan, J. Lumin., 130, 743 (2010); doi:10.1016/j.jlumin.2009.11.016.
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References
X.H. He, J. Zhou, N. Lian, J.H. Sun and M.Y. Guan, J. Lumin., 130, 743 (2010); doi:10.1016/j.jlumin.2009.11.016.
Z.L. Wang, H.B. Liang, M.L. Gong and Q. Su, J. AlloysComp., 432, 308 (2007); doi:10.1016/j.jallcom.2006.06.008.
M.M. Haque, H.-I. Lee and D.-K. Kim, J. Alloys Comp., 481, 792 (2009); doi:10.1016/j.jallcom.2009.03.083.
Y.Q. Zhai, Z.J. You, Y.H. Liu, Y.P. Sun and Q.Q. Ji, J. Rare Earths, 30, 114 (2012); doi:10.1016/S1002-0721(12)60005-2.
L. Zhou, J. Wei, J. Wu, F. Gong, L. Yi and J. Huang, J. Alloys Comp., 476, 390 (2009); doi:10.1016/j.jallcom.2008.09.005.
X.H. He, M.Y. Guan, Z.C. Li, T.M. Shang, N. Lian and Q. Zhou, J. Rare Earths, 28, 878 (2010); doi:10.1016/S1002-0721(09)60226-X.
F.W. Mo, L. Zhou, Q. Pang, F. Gong and Z. Liang, Ceram. Int., 38, 6289 (2012); doi:10.1016/j.ceramint.2012.04.084.
J.Y. Sun, C. Cao and H.Y. Du, Acta Phys. Sin., 60, 127801 (2011); doi:10.7498/aps.60.127801.
G. Jia, S. W. Ding, C. M. Huang, L. F. Li, C. Z. Wang, X. B. Song, L. Song, Microspheres Opt. Mater., 35, 288 (2012).
G. Blasse, Chem. Phys. Lett., 20, 573 (1973); doi:10.1016/0009-2614(73)80504-4.
L.D. Sun, C. Qian, C. Liao, X. Wang and C. Yan, Solid State Commun., 119, 393 (2001); doi:10.1016/S0038-1098(01)00247-2.
B. Yan and J.H. Wu, Mater. Chem. Phys., 116, 67 (2009); doi:10.1016/j.matchemphys.2009.02.042.
S. Yan, J. Zhang, X. Zhang, S. Lu, X. Ren, Z. Nie and X. Wang, J. Phys. Chem. C, 111, 13256 (2007); doi:10.1021/jp073991c.
J.G. Wang, X.P. Jing, C.H. Yan, J.H. Lin and F.H. Liao, J. Lumin., 121, 57 (2006); doi:10.1016/j.jlumin.2005.10.003.