Highly Efficient Blue Light‐Emitting Diodes with Low Efficiency Roll‐Off Based on Large‐Size and Gradient Alloy Quantum Dots

. Key to success is the suppression of defect-related nonradiative recombination, reduced leakage current, and improves charge injection balance through QD structural engineering. This work indicates a significant potential of newly developed large-size and gradient alloy QDs in promoting the commercialization of QD-LEDs.