1. Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, China
2. Macao Institute of Materials Science and Engineering (MIMSE), Macau University of Science and Technology, Taipa, Macao 999078, P. R. China
3. Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China