1. College of Chemistry, School of Physics and Optoelectronics, Xiangtan University, Xiangtan, Hunan 411105, China
2. Department of Chemistry and Institute of Molecular Functional Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, China
3. Department of Materials Science & Engineering, Academy for Advanced Interdisciplinary Research, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
4. College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, P. R. China
5. School of Physics, State Key Laboratory of Crystal Materials, Shandong. University, Jinan, Shandong, 250100, China