1. Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry, School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
2. College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
3. Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
4. College of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China
5. Institute of Physics, University of Tartu, W. Ostwald Street 1, Tartu 50411, Estonia
6. Institute of Physics, Jan Dtugosz University, Armii Krajowej 13/15, PL-42200 Częstochowa, Poland