1 Lei Zhao, † Jiahe Huang, † Yuancheng Zhang, † Tao Wang,*, † Weixiang Sun, † and Zhen Tong*, †,‡ † Research Institute of Materials Science and ‡ State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China. *E,mail: E,mail: fetwang@scut.edu.cn (T. Wang) E,mail: mcztong@scut.edu.cn (Z. Tong) Tel: (86),20,87112886; Fax: (86),20,87110273