1. School of Materials and Energy, Lanzhou University, Lanzhou 730000, China
2. National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology, Lanzhou University, Lanzhou 730000, China
3. Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education, Lanzhou University, Lanzhou 730000, China
4. Department of Chemistry, University of Houston, Houston, 77204 Texas, United States
5. College of Sciences & CQUPT-BUL Innovation Institute, Chongqing University of Posts and Telecommunications, Chongqing 400065, People’s Republic of China
6. Institute of Physics, University of Tartu, W. Ostwald Street 1, Tartu 50411, Estonia
7. Institute of Physics, Jan Długosz University, Armii Krajowej 13/15, PL-42200 Częstochowa, Poland
8. Academy of Romanian Scientists, Ilfov Street, no 3, 050044 Bucharest, Romania
9. Current Lighting Solutions, LLC, 1099 Ivanhoe Road, Cleveland, Ohio 44110, United States