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Upconversion Properties of NaGd(WO4)2:Ho3+/Yb3+ Yellow Phosphors Synthesized by Cyclic Microwave-Modified Sol-Gel Method
Corresponding Author(s) : Chang Sung Lim
Asian Journal of Chemistry,
Vol. 27 No. 9 (2015): Vol 27 Issue 9
Abstract
Upconversion properties of the NaGd1-x(WO4)2:Ho3+/Yb3+ yellow phosphors with doping concentrations of Ho3+ and Yb3+ (x = Ho3+ + Yb3+, Ho3+ = 0.05, 0.1, 0.2 and Yb3+ = 0.2, 0.45) were investigated. The synthesized particles were successfully synthesized by the micro-wave-modified sol-gel method. Well-crystallized particles showed a fine and homogeneous morphology with particle sizes of 2-5 μm. Under excitation at 980 nm, the upconversion intensity of NaGd0.5(MoO4)4:Ho0.05Yb0.45 phosphors exhibited yellow emissions based on a strong 550 nm emission band in the green region and a very strong 655 nm emission band in the red region. The Raman spectra of the particles indicated the presence of strong peaks at higher frequencies.
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M. Wang, G. Abbineni, A. Clevenger, C. Mao and S. Xu, Nanomedicine, 7, 710 (2011); doi:10.1016/j.nano.2011.02.013.
Y.J. Chen, H.M. Zhu, Y.F. Lin, X.H. Gong, Z.D. Luo and Y.D. Huang, Opt. Mater., 35, 1422 (2013); doi:10.1016/j.optmat.2013.02.012.
M. Lin, Y. Zhao, S.Q. Wang, M. Liu, Z.F. Duan, Y.M. Chen, F. Li, F. Xu and T.J. Lu, Biotechnol. Adv., 30, 1551 (2012); doi:10.1016/j.biotechadv.2012.04.009.
L. Li, W. Zi, H. Yu, S. Gan, G. Ji, H. Zou and X. Xu, J. Lumin., 143, 14 (2013); doi:10.1016/j.jlumin.2013.04.031.
C. Ming, F. Song and L. Yan, Opt. Commun., 286, 217 (2013); doi:10.1016/j.optcom.2012.08.095.
N. Xue, X. Fan, Z. Wang and M. Wang, J. Phys. Chem. Solids, 69, 1891 (2008); doi:10.1016/j.jpcs.2008.01.015.
Z. Shan, D. Chen, Y. Yu, P. Huang, F. Weng, H. Lin and Y. Wang, Mater. Res. Bull., 45, 1017 (2010); doi:10.1016/j.materresbull.2010.04.004.
W. Liu, J. Sun, X. Li, J. Zhang, Y. Tian, S. Fu, H. Zhong, T. Liu, L. Cheng, H. Zhong, H. Xia, B. Dong, R. Hua, X. Zhang and B. Chen, Opt. Mater., 35, 1487 (2013); doi:10.1016/j.optmat.2013.03.008.
W. Xu, H. Zhao, Y. Li, L. Zheng, Z. Zhang and W. Cao, Sens. Actuators B, 188, 1096 (2013); doi:10.1016/j.snb.2013.07.094.
C.S. Lim, Mater. Res. Bull., 47, 4220 (2012); doi:10.1016/j.materresbull.2012.09.029.
X. Yu, Y. Qin, M. Gao, L. Duan, Z. Jiang, L. Gou, P. Zhao and Z. Li, J. Lumin., 153, 1 (2014); doi:10.1016/j.jlumin.2014.02.033.