04 December 2015 Direct Observation of the Biaxial Stress Effect on Efficiency Droop in GaN-based Light-emitting Diode under Electrical Injection Jinjian Zheng1,2, Shuiqing Li2, Chilun Chou2, Wei Lin1, Feilin Xun2, Fei Guo1, Tongchang Zheng1, Shuping Li1 & Junyong Ka...