1. School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2. Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia
3. Siberian Federal University, Krasnoyarsk, 660041, Russia
4. Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia
5. Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa
6. State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, China