1. R&D Center for Solid-State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3. School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, Beijing 100081, China
4. School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan Province, China
5. Korea Institute of Ceramic Engineering and Technology, 15-5, Chungmugong-dong, Jinju-si, Gyeongsongnam-do 52851, South Korea