1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Engineering Research Center of Micro−Nano Optoelectronic Materials and Devices, Ministry of Education, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Department of Physics, Xiamen University, Xiamen 361005, Fujian, China
4. Research and Development Center for Solid State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
5. Ultratrend Technologies Inc., Hangzhou 311199, Zhejiang, China