[1] [1] W. J. Yang, L. Luo, T. M. Chen, and N. S. Wang, Chem. Mater. 17, 3883 (2005).

[2] [2] Y. Zhang, G. Li, D. Geng, M. Shang, C. Peng, and J. Lin, Inorg. Chem. 51, 11655 (2012).

[3] [3] Y. Xu, S. Cui, H. Fu, J. Qian, Q. Luo, X. Qiao, X. Fan, and X. Zhang, Chin. Opt. Lett. 10, 031602(2012).

[4] [4] Y. Tian, X. Qi, X. Wu, R. Hua, and B. Chen, J. Phys. Chem. C 113, 10767 (2009).

[5] [5] Z. Y. Mao, and D. J. Wang, Inorg. Chem. 49, 4922 (2010).

[6] [6] M. Peng, Z. Pei, G. Hong, and Q. Su, J. Mater. Chem. 13, 1202 (2003).

[7] [7] C. Wang, M. Peng, N. Jiang, X. Jiang, C. Zhao, and J. Qiu, Mater. Lett. 61, 3608 (2007).

[8] [8] D. Chen, H. Miyoshi, T. Akai, and T. Yazawa, Appl. Phys. Lett. 86, 231908 (2005).

[9] [9] M. Peng, Z. Pei, G. Hong, and Q. Su, Chem. Phys. Lett. 371, 1 (2003).

[10] [10] Q. Zhang, Y. Qiao, B. Qian, G. Dong, J. Ruan, X. Liu, Q. Zhou, Q. Chen, J. Qiu, and D. Chen, J. Lumin. 129, 1393 (2009).

[11] [11] L. Zhang, A. B¨ogershausen, and H. Eckert, J. Am. Ceram. Soc. 88, 897 (2005).

[12] [12] G. Gao, S. Reibstein, M. Peng, and L. Wondraczek, J. Mater. Chem. 21, 3156 (2011).

[13] [13] G. Jia, P. A. Tanner, C. K. Duan, and D. G. Jeannette, J. Phys. Chem. C 114, 17905 (2010).

[14] [14] M. Nogami and Y. Abe, J. Non-Cryst. Solids 197, 73 (1996).

[15] [15] K. Arai, H. Namikawa, K. Kumata, T. Honda, Y. Ishii, and T. Handa, J. Appl. Phys. 59, 3430 (1986).

[16] [16] A. Biswas, C. S. Friend, and P. N. Prasad, Mater. Lett. 39, 227 (1999).

[17] [17] L. Yang, M. Yamashita, and T. Akai, J. Non-Cryst. Solids357, 2400 (2011).

[18] [18] M. Peng, J. Qiu, L. Yang, and C. Zhao, Opt. Mater. 27, 591 (2004).

[19] [19] J. Duffy, J. Non-Cryst. Solids 196, 45 (1996).

[20] [20] P. Smet, D. Poelman, and R. Van Meirhaeghe, J. Appl. Phys. 95, 184 (2004).