[1] KAUST, Photon Lab, Thuwal, Saudi Arabia
[2] Chinese Acad Sci, Inst Semicond, Res & Dev Ctr Solid State Lighting, Beijing, Peoples R China
[3] Univ Chinese Acad Sci, Beijing, Peoples R China
[4] Beijing Engn Res Ctr Third Generat Semicond Mat &, Beijing, Peoples R China
[5] State Key Lab Solid State Lighting, Beijing, Peoples R China