1. Semiconductor
Lighting Research and Development Center, Institute of Semiconductors, Chinese Academy of Sciences, A35 Qinghua East Road, Haidian
District, Beijing 100083, P. R. China
2. College
of Materials Sciences and Opto-Electronic Technology, University of Chinese Academy of Sciences, A19 Yuquan Road, Shijingshan District, Beijing 100049, P. R. China
3. SKLSM,
Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, P. R. China