Quantum-dot light-emitting diodes (QD-LEDs) promise a new generation of efficient, low-cost, large-area and flexible electroluminescent devices. However, the inferior performance of green and blue QD-LEDs compared with their red counterpart is hindering the commercialization of QD-LEDs in display and solid-state lighting applications. Here we demonstrate green and blue QD-LEDs with ~100% conversion of the injected charge carriers into emissive excitons. The key to success is the elimination of electron leakage at the organic/inorganic interface by using hole-transport polymers with simultaneous low electron affinity and reduced energetic disorder. Our devices exhibit high external quantum efficiencies over a wide range of luminance values (peak external quantum efficiencies of 28.7% for green and 21.9% for blue) and excellent stability (extrapolated T₉₅ lifetime is 580,000 h for green and 4,400 h for blue QD-LEDs). We expect our work to provide a general strategy for eliminating charge leakage in solution-processed LEDs featuring organic/inorganic interfaces.

量子点发光二极管 (QD-LED) 有望成为新一代高效、低成本、大面积和柔性的电致发光器件。然而，与红色对应物相比，绿色和蓝色 QD-LED 的性能较差，这阻碍了 QD-LED 在显示和固态照明应用中的商业化。在这里，我们展示了绿色和蓝色 QD-LED，其中注入的电荷载流子约 100% 转换为发射激子。成功的关键是通过使用同时具有低电子亲和力和减少能量无序的空穴传输聚合物来消除有机/无机界面处的电子泄漏。我们的器件在很宽的亮度值范围内表现出很高的外部量子效率（绿色峰值外部量子效率为 28.7%，绿色为 21.T ₉₅的寿命为 580,000 小时（绿色）和 4,400 小时（蓝色 QD-LED）。我们希望我们的工作能够为消除具有有机/无机界面的溶液处理 LED 中的电荷泄漏提供一般策略。