Influences of stress on the properties of GaN/InGaN multiple quantum well LEDs grown on Si (111) substrates*
Liu Ming-Gang, Yang Yi-Bin, Xiang Peng, Chen Wei-Jie, Han Xiao-Biao, Lin Xiu-Qi, Lin Jia-Li, Luo Hui, Liao Qiang, Zang Wen-Jie, Wu Zhi-Sheng, Liu Yang, Zhang Bai-Jun†
       
(a) EL spectra of LED1 (with InGaN IL), LED2 (without IL), LED3 (with AlGaN IL); (b) light emitting images of the three LEDs; (c) micro-PL spectra around bright spot on LED3.