[1] [1] Kim J S,Jeon P E,Choi J C,et al. Applied Physics Letters,2004,84(15),2931.

[3] [3] Li P L,Yang Z P,Wang Z J,et al. Chinese Physics B,2008,17(3),1135.

[4] [4] Nakamura S,Fasol G. The Blue Laser Diode. Berlin,Springer-Verlag,1997. 1.

[6] [6] Park J K,Kim C H,Park S H,et al. Applied Physics Letter,2004,84(10),1647.

[7] [7] Lim M I,Park J K,Kim C H,et al. Journal of Materials Science Letters,2003,22,1351.

[8] [8] Kim J S,Jeon P E,Choi J C,et al. Applied Physics Letters,2004,84(15),2931.

[9] [9] Cheng W D,Zhang H,Lin Q S,et al. Chemical Materials,2001,13,1841.

[10] [10] Ofelt G S. Journal of Chemistry and Physics,1962,37(3),511.

[11] [11] Judd B R. Physics Review,1962,127(3),750.

[12] [12] Dexter D L,Schulman J H. Journal of Chemistry and Physics,1954,22(5),1063.

[13] [13] Sun L D,Qian C,Liao C S,et al. Solid State Communications,2001,119,393