1. Foundation department Qilu Institute of Technology, Jinan 250200, Shandong, P. R. China
2. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
3. College of Physics and Optoelectronic Engineering, Shenzhen University, Guangdong 518060, P. R. China
4. Department of Physics, University of Ulsan, Ulsan 44610, Republic of Korea
5. Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia