1. State Key Laboratory
of Luminescent Materials and Devices and Institute of Optical Communication
Materials, South China University of Technology, Guangzhou 510641, China
2. Guangzhou LEDteen Optoelectronics Co., Ltd. Guangzhou 510663, China
3. State Key Laboratory of Optoelectronic Materials and
Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P.R. China