[1] L W Ji, Y K Su, S J Chang, S H Liu, C K Wang, S T Tsai, T H Fang, L W Wu, Q K Xue. Solid-State Electron, 47, 1753(2003).

[2] J S Yu, S Slivken, A Evans, J David, M Razeghi. Appl. Phys. Lett, 82, 3397(2003).

[3] F Zhao, X Lv, A Majumdar, Z Shi. Appl. Phys. Lett, 84, 1251(2004).

[4] L W Ji, S J Young, C H Liu, W Water, T H Meen, W Y Jywe. J. Cryst. Growth, 310, 2476(2008).

[5] A Asgari, S Razi. Opt. Express, 18(2010).

[6] D Yanover, R K Čapek, A R Brusilovski, R Vaxenburg, N Grumbach, G I Maikov, O Solomeshch, A Sashchiuk, E Lifshitz. Chem. Mater, 24, 4417(2012).

[7] S Jahangir, I Pietzonka, M Strassburg, P Bhattacharya. Appl. Phys. Lett, 105(2014).

[8] C L Tsai. J. Lumin, 174, 36(2016).

[9] L Zhang, C H Teng, P C Ku, H Deng. Appl. Phys. Lett, 108(2016).

[10] S N Saravanamoorthy, A J Peter, C W Lee. Chem. Phys, 483–484, 1(2017).

[11] Q Q Wu, F Cao, L M Kong, X Y Yang. Chin. Phys. B, 28(2019).

[12] B Damilano, N Grandjean, S Dalmasso, J Massies. Appl. Phys. Lett, 75, 3751(1999).

[13] L L Lu, W F Xie, H Hassanabadi. J. Appl. Phys, 109(2011).

[14] Y Yakar, B Çakır, A Özmen. Opt. Commun, 283, 1795(2010).

[15] M Cristea, A Radu, E C Niculescu. J. Lumin, 143, 592(2013).

[16] Y C She, T T Luo, W X Zhang, M W Ran, D L Wang. Chin. Phys. B, 25(2016).

[17] O Jani, I Ferguson, C Honsberg, S Kurtz. Appl. Phys. Lett, 91(2007).

[18] N E Gorji, H Movla, F Sohrab, A Hosseinpour, M Rezaei, H Babaei. Physica E, 42, 2353(2010).

[19] Z W Ren, L Chao, X Chen, B J Zhao, X F Wang, J H Tong, J Zhang, X J Zhuo, D W Li, H X Yi, S T Li. Opt. Express, 21, 7118(2013).

[20] H Movla. Optik, 127, 4799(2016).

[21] N B Afkir, E Feddi, F Dujardin, M Zazoui, J Meziane. Physica B, 534, 10(2018).

[22] J J Shi, Z Z Gan. J. Appl. Phys, 94, 407(2003).

[23] J J Shi, C X Xia, S Y Wei, Z X Liu. J. Appl. Phys, 97(2005).

[24] M Zhang, J J Shi. Superlattices Microstruct, 50, 529(2011).

[25] H E Ghazi, A J Peter. Physica B, 470–471, 64(2015).

[26] L C Guo, X L Wang, H L Xiao, B Z Wang. J. Cryst. Growth, 298, 522(2007).

[27] Y M Chi, J J Shi. J. Lumin, 128, 1836(2008).

[28] C X Xia, S Y Wei. Phys. Lett. A, 346, 227(2005).

[29] C X Xia, S Y Wei. Phys. Lett. A, 359, 161(2006).

[30] A Özmen, Y Yakar, B Çakır, U Atav. Opt. Commun, 282, 3999(2009).

[31] B Çakır, Y Yakar, A Özmen. J. Lumin, 132, 2659(2012).

[32] S Ortakaya, M Kirak, A Guldeste. J. Nonlinear Opt. Phys. Mater, 26(2017).

[33] A E Kavruk, M Sahin, F Koc. J. Appl. Phys, 114(2013).

[34] L Zhang, Z Yu, W Yao, Y Liu, H Ye. Superlattices Microstruct, 48, 434(2010).

[35] A S Jbara, Z Othaman, M A Saeed. Chin. Phys. B, 25(2016).

[36] W H Liu, Y Qu, S L Ban. Superlattices Microstruct, 102, 373(2017).

[37] X M Cao, W H Liu, X C Yang, Y Qu, Y Xing. Mod. Phys. Lett. B, 33(2019).

[38] H E Ghazi, A Jorio, I Zorkani. J. Optoelectron. Adv. Mater, 16, 1242(2014).

[39] O Ambacher, J Majewski, C Miskys, A Link, M Hermann, M Eickhoff, M Stutzmann, F Bernardini, V Fiorentini, V Tilak, B Schaff, L F Eastman. J. Phys.: Condens. Matter, 14, 3399(2002).

[40] J Wu, W Walukiewicz, K M Yu, J W Ager, E E Haller, H Lu, W J Schaff. Appl. Phys. Lett, 80, 4741(2002).

[41] J Q Wu. J. Appl. Phys, 106(2009).

[42] G Rezaei, M R K Vahdani, B Vaseghi. Physica B, 406, 1488(2011).