[1] Zhao G Y, Tian Y, Wang X, Fan H Y, Hu L L 2013 J. Lumin. 134 837
[2] Wang Y Z, Yu D C, Lin H H, Ye S, Peng M Y, Zhang Q Y 2013 J. Appl. Phys. 114 203510
[3] Neuvonen P T, Sigvardt K, Johannsen S R, Chevallier J, Julsgaard B, Ram S K, Larsen A N 2014 Appl. Phys. Lett. 104 102106
[4] Ding W C, Liu Y, Zhang Y, Guo J C, Zuo Yu H, Cheng B W, Yu J Z, Wang Q M 2009 Chin. Phys. B 18 3044
[5] Duan S Q, Tan N, Zhang Q Y 2005 Chin. Phys. 14 0615
[6] Rivera V A G, El-Amraoui M, Ledemi Y, Messaddeq Y, Marega Jr E 2014 J. Lumin. 145 787
[7] Xiao Z S, Serna R, Afonso C N 2007 J. Appl. Phys. 101 033112
[8] Komukai T, Yamamoto T, Sugawa T, Miyajima Y 1995 IEEE J. Quantum Electron. 31 1880
[9] Pavani K, Moorthy L R, Kumar J S, Babu A M 2013 J. Lumin. 136 383
[10] Liu H Y, Zeng F, Lin Y L, Wang G Y, Pan F 2013 Appl. Phys. Lett. 102 181908
[11] Youn C J, Jeong T S, Han M S, Kim J H 2004 J. Cryst. Growth 261 526
[12] Li M Z, Lu F, Xu F, Jiang Z M, Wang X, Lou H N, Ma Z Q, Zheng L L 2012 Mater. Chem. Phys. 137 270
[13] Seo S Y, Kim K J, Shin J H 2010 Thin Solid Films 518 7012
[14] Pu Y, Xu F, Jiang Z M, Ma Z Q, Lu F, Chen D D 2012 Appl. Phys. Lett. 101 191903
[15] Xiao Z S, Zhou B, Xu F, Zhu F, Yan L, Zhang F, Huang A P 2009 Phys. Lett. A 373 890
[16] van den Hoven G N, Snoeks E, Polman A, van Uffelen J W M, Oei Y S, Smith M K 1993 Appl. Phys. Lett. 62 3065
[17] Xu F, Zheng L L, Li M Z, Lu F, Ma Z Q, Jiang Z M, Zhou P H, Shi J W, Pu Y 2012 Appl. Opt. 51 1115
[18] Liu Q L, Yu G H, Jiang Y 2009 Chin. Phys. B 18 1266
[19] Chun J 2009 Adv. OptoElectron. 2009 278105
[20] Wang X S, Nie Q H, Xu T F, Shen X, Dai S X, Gai N, Zhou Y 2009 Spectrochim. Acta A 72 543
[21] Richards B, Shen S X, Jha A, Tsang Y, Binks D 2007 Opt. Express 15 6546
[22] Lakshminarayana G, Yang R, Mao M F, Qiu J R 2009 Opt. Mater. 31 1506
[23] Xu F, Serna R, Jimenez de Castro M, Fernandez Navarro J M, Xiao Z 2010 Appl. Phys. B 99 263
[24] Miyakawa T, Dexter D L 1970 Phys. Rev. B 1 2961