1. Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P. R. China
2. College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, P. R. China
3. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China
4. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518060, P. R. China