[1] Zhou Z, Komori T, Ayukawa T, Yukawa H, Morinaga M, Koizumi A, Takeda Y 2005 Appl. Phys. Lett. 87 091109
[2] Lang J, Han Q, Yang J, Li C 2010 J. Appl. Phys. 107 074302
[3] Tang Z K, Wong G K L, Yu P 1998 Appl. Phys. Lett. 72 3270
[4] Zhang J K, Deng S H, Jin H, Liu Y L 2007 Acta Phys. Sin. 56 5371 (in Chinese) [张金奎, 邓胜华, 金慧, 刘悦林 2007 物理学报 56 5371]
[5] Mujdat C, Yasein C, Saliha I 2007 Phys. Stat. Sol. C 4 1337
[6] Deng B, Sun H Q, Guo Z Y, Gao X Q 2010 Acta Phys. Sin. 59 1212 (in Chinese) [邓贝, 孙慧卿, 郭志友, 高小奇 2010 物理学报 59 1212]
[7] Zhou C J, Kang J Y 2006 Chin. J. Lumin. 27 917 (in Chinese) [周昌杰, 康俊勇 2006 发光学报 27 917]
[8] Xia C H, Zhou M, Han X Y, Yin P F 2011 Mater. Rev. 25 11
[9] Huang L M, Rosa A L, Ahuja R 2006 Phys. Rev. B 75 75206
[10] Pei G Q, Xia C T, Wu B, Wang T 2008 Comput. Mater. Sci. 43 489
[11] Liu Y, Tian T, Wang B 2008 J. Appl. Phys. 103 056104
[12] Chen J T, Wang J, Zhang F, Zhang G A, Wu Z G, Yan P X 2008 J. Cryst. Growth 310 2627
[13] Liu H, Yang J, Hua Z, Zhang, Yang L, Xiao L 2010 Appl. Surf. Sci. 256 4162
[14] Jang Y R, Yoo K H, Ahn J S, Kim C, Park S M 2011 Appl. Surf. Sci. 257 2822
[15] Bai Y F, Wang Y X, Yang K, Zhang X R, Song Y L, Wang C H 2008 Opt. Commun. 218 5448
[16] Lang J H, Li X, Yang J H, Yang L L 2011 Appl. Surf. Sci. 257 9574
[17] Minami T, Yamamoto T, Miyata T 2000 Thin Solid Films 366 63
[18] Kaur R, Singh A V, Mehra R M 2004 Mater. Sci. Poland 22 201
[19] Liu L, Yu P Y, Ma Z, Mao S S 2008 Phys. Rev. Lett. 100 127203
[20] Seo S Y, Lee S, Park H D, Shin N, Sohn K S 2002 J. Appl. Phys. 92 5248
[21] Bae J S, Jeong J H, Yi S S, Park J C 2003 Appl. Phys. Lett. 82 3629
[22] Garcia-Murillo A, Luyer C L, Garapon C 2002 Opt. Mater. 19 161
[23] Keiji W, Masatoshi S, Hideaki T 1999 J. Electroanal Chem. 473 250
[24] Vanderbilt D 1990 Phys. Rev. B 41 7892
[25] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865
[26] Guan L, Li Q, Zhao Q X, Guo J X, Zhou Y 2009 Acta Phys. Sin. 58 5634 (in Chinese) [关丽, 李强, 赵庆勋, 郭建新, 周阳 2009 物理学报 58 5634]
[27] Deng S H, Duan M Y, Xu M, He L 2011 Physica B 406 2314
[28] Shen X C 1992 The Optical Properties of Semiconductor (Beijing: Science Press) p24 (in Chinese) [沈学础 1992 半导体光学性质(北京: 科学出版社) 第24页]
[29] Duan M Y, Xu M, Zhou H P, Shen Y B, Chen Q Y, Ding Y C, Zhu W J 2007 Acta Phys. Sin. 56 5359 (in Chinese) [段满益, 徐明, 周海平, 沈益斌, 陈青云, 丁迎春, 祝文军 2007 物理学报 56 5359]
[30] Zhang X D, Guo M L, Li W X, Liu C L 2008 J. Appl. Phys. 103 063721
[31] Lan W, Liu Y P, Zhang M, Wang B, Yan H, Wang Y Y 2007 Mater. Lett. 61 2262
[32] Anomalous E B 1954 Phys. Rev. 93 632
[33] Lu J G, Fujita S, Kawaharamura T, Nishinaka H, Kamada Y, Ohshima T, Ye Z Z, Zeng Y J, Zhang Y Z, Zhu L P, He H P, Zhao B H 2007 J. Appl. Phys. 101 083705