1. R&D Center for Semiconductor Lighting, Chinese Academy of Sciences, Beijing 100083, People's Republic of China
2. State Key Laboratory of Solid State Lighting, Beijing 100083, People's Republic of China
3. Beijing Engineering Research Center for the 3rd Generation Semiconductor Materials and Application, Beijing 100083, People's Republic of China
4. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
5. State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha, Hunan 410083, People's Republic of China