Since the first demonstration of quantum dot based light-emitting diodes(QD-LEDs)in 1994,QD-LEDs have attracted extensive attention in recent years for their potential applications in high-efficiency and low-cost solid-sate lighting and flat-panel displays.Due to the great efforts on developing high-quality QDs and designing proper QD-LED architectures,the device performance has been promptly improved,especially for the great progresses on the brightness and efficiencies of green and red QD-LEDs.