[1] Xiong H M, Xu Y, Ren Q G. J. Am. Chem. Soc., 2008, 130: 7522.
[2] Wang H P, Jiang H, Wang X M. Chem. Commun., 2010, 46: 6900.
[3] Shi H Q, Li W N, Sun L W, et al. Chem. Commun., 2011, 47: 11921.
[4] Suehiro J, Nakagawa N, Hidaka S. Nanotechnology, 2006, 17: 2567.
[5] Tang X S, Choo E S G, Li L. Chem. Mater., 2010, 22: 3383.
[6] Cheng H M, Lin K F, Hsu H C. Appl. Phys. Lett., 2006, 88: 261.
[7] Xu X Y, Xu C X, Dai J, et al. J. Phys. Chem. Solids, 2012, 73: 858.
[8] Van Dijken, Meulenkamp E A, Vanmaekelbergh D. J. Lumin., 2000, 90: 123.
[9] Van Dijken, Makkinje J, Meijerink A. J. Lumin., 2001, 92: 323.
[10] Singh L R, Ningthoujam R S, Singh S D. J. Alloys. Compd., 2009, 487: 466.
[11] Zhang L Y, Yin L W, Wang C X. J. Phys. Chem. C, 2010, 114: 9651.
[12] Xiong H M, Wang Z D, Liu D P. Adv. Funct. Mater., 2005, 15: 1751.
[13] Zeng H B, Yang S K, Cai W P. J. Phys. Chem. C, 2011, 115: 5038.
[14] Zeng H B, Duan G T, Li L, et al. Adv. Funct. Mater., 2010, 20: 561.
[15] Xiong H M, Wang Z D, Liu D P. J. Adv. Funct. Mater., 2005, 15: 1751.