1. Department of Physics and Collaborative Innovation Center for; Optoelectronic Semiconductors and Efficient Devices; Fujian Provincial Key Laboratory of Theoretical; and Computational Chemistry; Xiamen University; Xiamen Fujian 361005 P.R. China
2. School of Optoelectronic Information; University of Electronic Science and Technology of China; Chengdu Sichuan 610054 P.R. China