[1] [1] Lee C S, Kim E K, Kim J Y, et al. Metals and Materials International, 2012, 18(5): 869.

[2] [2] Prakash S S, Brinker C J, Hurd A J. Nature, 1995, 374: 439.

[3] [3] Asefa T, MacLachlan M J, Coombs N, et al. Nature, 1999, 402: 867.

[4] [4] Li Ying, Zhao Gaoyang, Ren Yang, et al. Surf. Interface Anal., 2011, 43: 1199.

[5] [5] Hsu Chenghsing, He Yida, Yang Shufong. Cryst. Res. Technol., 2011, 46(1): 65.

[6] [6] Solaga C T. Applied Optics, 1981, 20(20): 3464.

[7] [7] Nostell P, Roos A, Karlsson B. Thin Solid Films, 1999, 351(1-2): 170.

[8] [8] Wang X D, Shen J J. Sol-Gel Sci. Technol., 2010, 53: 322.

[9] [9] Rrene P, Priotton J J, Beaurain L, et al. Sol-Gel Sci. Technol., 2000, 19: 533.

[10] [10] Thomas I M. Applied Optics, 1992, 31(28): 6145.

[11] [11] Wu G M, Wang J, Shen J J, et al. Non-Cryst. Solids, 2000, 275: 169.

[12] [12] Zhang Y L, Zhang X X, Ye H P, et al. Materials Letters, 2012, 69: 86.

[15] [15] Chi F T, Yan L H, Lv H B. Materials Letters, 2011, 65: 1095.

[16] [16] Vicente G S, Bayon R, German N, et al. Thin Solid Films, 2009, 517(10): 3157.

[17] [17] Wongcharee K, Brungs M, Chaplin R. J, et al. Sol-Gel Sci. Technol., 2002, 25: 215.

[20] [20] Xi J Q, Schubert M F, Kim J K, et al. Nature Photonics, 2007, 1: 176.

[21] [21] Mehner A, Dong J, Prenzel T J, et al. Sol-Gel Sci. Technol., 2010, 54: 355.

[22] [22] Wang Z Y, Stein A. Mater. Chem., 2008, 20: 1029.