1. The China-Germany Research Center for Photonic Materials and Device, State Key Laboratory of Luminescent Materials and Devices, and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology
2. Guangzhou 510641
3. P. R. China
4. College of Mathematics and Physics, Chongqing University of Posts and Telecommunications
5. Chongqing 400065
6. Institute of Physics, University of Tartu
7. Tartu 50411
8. Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS
9. Krasnoyarsk 660036
10. Russia
11. Siberian Federal University
12. Krasnoyarsk 660041
13. Department of Chemistry, Hong Kong Baptist University
14. Kowloon Tong
15. School of Applied Physics and Materials
16. Wuyi University