[1] E. Downing, L. Hesselink, J. Ralston, and R. Macfarlane, Science 273, 1185 (1996).

[2] S. Sivakumar, F. C. J. M. van Veggel, and M. Raudsepp, J. Am. Chem. Soc. 127, 12464 (2005).

[3] G. Yi, H. Lu, S. Zhao, Y. Ge, W. Yang, D. Chen, and L. Guo, Nano Lett. 4, 2191 (2004).

[4] H. Yang, Z. Dai, and N. Zu, Chin. Phys. 16, 1650 (2007).

[5] X. Wang, X. Yan, and C. Kan, J. Mater. Chem. 21, 4251 (2011).

[6] H. Yu, L. Zhao, J. Meng, Q. Liang, X. Yu, B. Tang, and J. Xu, Chin. Opt. Lett. 3, 469 (2005).

[7] B. Chen, S. Zhao, and L. Hu, Chin. Opt. Lett. 1, 699 (2003).

[8] C. Li, C. Song, S. Li, and J. Gao, Chin. Opt. Lett. 1, 664 (2003).

[9] S. Zhao, F. Zheng, S. Xu, H. Wang, and B. Wang, Chin. Opt. Lett. 7, 416 (2008).

[10] H. Yang, Z. Dai, and Z. Sun, J. Lumin. 124, 207 (2007).

[11] Y. Wang, Y. Bai, and Y. Song, Chin. Opt. Lett. 7, 524 (2008).

[12] K. W. Kramer, D. Biner, G. Frei, H. U. Gudel, M. P. Hehlen, and S. R. Luthi, Chem. Mater. 16, 1244 (2004).

[13] F. Auzel, Chem. Rev. 104, 139 (2004).

[14] J. F. Suyver, J. Grimm, M. K. van Veen, D. Biner, K. W. Kramer, and H. U. Gudel, J. Lumin. 117, 1 (2006).

[15] H. Yang, Z. Dai, and Z. Sun, Chin. Phys. 15, 1273 (2006).

[16] H. Xu and Z. Jiang, Chem. Phys. 287, 155 (2003).

[17] R. Francini, S. Pietrantoni, M. Zambelli, A. Speghini, and M. Bettinelli, J. Alloys Compd. 380, 34 (2004).

[18] S. Xiao, X. Yang, Z. Liu, and X. Yan, Opt. Mater. 28, 285 (2006).

[19] H. Liang, Y. Zheng, G. Chen, L. Wu, Z. Zhang, and W. Cao, J. Alloys Compd. 509, 409 (2011).

[20] A. Patra, C. S. Friend, R. Kapoor, and P. N. Prasad, J. Phys. Chem. B 106, 1909 (2002).

[21] G. Wang, S. Dai, J. Zhang, L. Wen, J. Yang, and Z. Jiang, Spectrochim. Acta Part A 64, 349 (2005).

[22] L. Vegard, Z. Phys. 5, 17 (1921).

[23] S. Schnell, W. Ltithy, and H. P. Weber, Journal of Applied Mathematics and Physics 39, 96 (1988).

[24] M. D. Shinn, W. A. Sibley, M. G. Drexhage, and R. N. Brown, Phys. Rev. B 27, 6635 (1983).

[25] A. Bednarkiewicz and W. Strek, J. Phys. D: Appl. Phys. 35, 2503 (2002).

[26] M. Pollnau, D. R. Gamelin, S. R. Luthi, H. U. Gudel, and M. P. Hehlen, Phys. Rev. B 61, 3337 (2000).

[27] J. F. Suyver, A. Aebischer, S. Garcia-Revilla, D. Gerner, and H. U. Gudel, Phys. Rev. B 71, 125123 (2005).

[28] S. Xiao, X. Yang, and J. Ding, Acta Physica Sinica 58, 3812 (2009).

[29] Y. Wang and X. Li, Journal of the Electrochemical Society 153, G238 (2006).

[30] M. D. Shinn, W. A. Sibley, M. G. Drexhage, and R. N. Brown, Phys. Rev. B 27, 6635 (1983).

[31] P. Kisliuk, W. F. Krupke, and J. B. Gruber, J. Chem. Phys. 40, 3606 (1964).

[32] M. J. Weber, Phys. Rev. 157, 262 (1967).

[33] O. Guillot-Noel, B. Bellamy, B. Viana, and D. Gourier, Phys. Rev. B 60, 1668 (1999).