[1] Huang M H, Mao S, Feick H, et al. Sicence, 2001, 292: 1897.
[2] Tang Z K, Wong G K L, Yu P. Appl. Phys. Lett., 1998, 72: 3270.
[3] Reynolds D C, Look D C, Jogai B, et al. Phy. Rev. B, 1988, 57: 12151.
[4] Ronfarcf-Haret J C. Journal of Luminescence, 2003, 104: 1.
[5] Liu S M, Liu F Q, G H Q, et al. Phys. Lett. A, 2000, 271: 128.
[6] Travnikov V V, Freiberg A, Savikhin S F. Lumin., 1990, 47: 107.
[7] Yu Y, Wang Y, Chen D, et al. Nanotechnology, 2008, 19: 055711.
[9] Huang W L, Labis J, Ray S C, et al. Appl. Phys. Lett., 2010, 96: 062112.
[10] Park Y K, Han J I, Kwak M G, et al. Appl. Phys. Lett., 1998, 72: 668.
[11] Yan B, Chen X, Wu J H. Appl. Surf. Scie., 2007, 253: 8575.
[12] Dijken A V, Meulenkamp E A, Vanmaekelbergh D, et al. Phys. Chem. B, 2000, 104: 1715.