1. School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, P. R. China
2. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, P. R. China
3. Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology, School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528225, P. R. China
4. School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, P. R. China