1. SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province; College of Optoelectronic Engineering, Shenzhen University; Shenzhen 518060 P.R. China
2. Physical Sciences Division; IBM TJ Watson Research Center; Yorktown Heights NY 10598 New York USA
3. Department of Computer Science; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA
4. Department of Physics; Wake Forest University; Winston Salem NC 27109 USA
5. College of Engineering and Applied Science, Nanjing University; Nanjing 210093 P.R. China
6. Scintillation Materials Research Center; University of Tennessee; Knoxville TN 37996 USA