1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China
2. Department of Physics, Beihang University, Beijing 100191, China
3. Department of Physical Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan
4. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China
5. Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
6. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China