1. Department of Physics; Jinggangshan University; Ji'an 343009 China
2. Scintillation Materials Research Center; University of Tennessee; Knoxville Tennessee 37996
3. Research and Development Center; SICCAS; Shanghai 201800 China
4. Laboratory for Advanced Scintillation Materials and Performance; SICCAS; Shanghai 201800 China
5. School of Materials Science and Engineering; Shanghai University; Shanghai 200444 China