1. Center
for Advanced Optoelectronic Functional Materials Research, and Key
Laboratory of UV Emitting Materials and Technology of Ministry of
Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China
2. Key
Laboratory for Mineral Luminescence and Microstructure of Autonomous, Xinjiang Normal University, 102 New Hospital Street, Urumchi 830054, China