[2] Kim J S, Jeon P E, Park Y H, et al. Appl. Phys. Lett., 2004, 85(17): 3696.

[3] Won Y H, Jang H S, Im W B, et al, Appl. Phys. Lett., 2006, 89: 231909.

[4] Jang H S, Jeon D Y. Appl. Phys. Lett., 2007, 90: 041906.

[5] Nakamura S, Fasol G. The Blue Laser Diode: GaN Based Light Emitters and Lasers. Springer Berlin, 1997.

[6] Adam Christensen. Samuel Graham. Applied Thermal Engineering, 2008, 29: 364.

[7] Wang Z J, Li P L, Wang G, et al. Acta Phys. Sin., 2008, 57: 4575.

[10] Chen Y H, Shi C S, Yan W Z, et al. Appl. Phys. Lett., 2006, 88: 61906.

[11] Ma L, Wang D J, Mao Z Y, et al. Appl. Phys. Lett., 2008, 93: 144101.

[17] Poort S, Van Krevel J, Stomphorst R, et al. Journal of Solid State Chemistry, 1996, 122(2): 432.

[18] Liu W R, Chiu Y C, Yeh Y T, et al. J. Electrochem. Soc., 2009, 156(7), J165.

[19] Blasse G, Grabmaier B C. Luminescent Materials. Springer Berlin, 1994. 52.

[20] Chang C K, Chen T M. Appl, Phys. Lett., 2007, 91: 081902.

[21] Yang W J, Chen T M. Appl. Phys. Lett., 2007, 90: 171908.