Highly efficient and high-definition displays with deformable form factors are highly desirable for next-generation electronic devices. Despite the unique advantages of quantum dots (QDs), including high photoluminescence quantum yield, wide colour range and high colour purity, developing a QD patterning process for high-definition pixels and efficient QD light-emitting diodes (QLEDs) is in its early stages. Here we present highly efficient QLEDs through ultrahigh-definition double-layer transfer printing of a QD/ZnO film. Surface engineering of viscoelastic stamps enables double-layer transfer printing that can create RGB pixelated patterns with 2,565 pixels per inch and monochromic QD patterns with ~20,526 pixels per inch. The close packing of both QDs and ZnO nanoparticles by double-layer transfer printing substantially minimizes the leakage current, enhancing the external quantum efficiency of our devices to 23.3%. Furthermore, we demonstrate highly efficient wearable QLEDs fabricated by our technique. This study paves the way for the development of highly efficient, full-colour QD displays via the transfer printing technique, demonstrating great promise for next-generation display technologies.

具有可变形外形的高效、高清显示器是下一代电子设备非常需要的。尽管量子点 (QD) 具有独特的优势，包括高光致发光量子产率、宽色域和高色纯度，但用于高清像素和高效 QD 发光二极管 (QLED) 的 QD 图案化工艺的开发仍处于早期阶段。在这里，我们通过 QD/ZnO 薄膜的超高清双层转印来展示高效的 QLED。粘弹性印模的表面工程实现了双层转移印刷，可以创建每英寸 2,565 像素的 RGB 像素化图案和每英寸约 20,526 像素的单色 QD 图案。通过双层转印印刷将量子点和氧化锌纳米颗粒紧密堆积，大大减少了漏电流，将器件的外量子效率提高到23.3%。此外，我们还展示了采用我们的技术制造的高效可穿戴 QLED。这项研究为通过转移印刷技术开发高效、全彩 QD 显示器铺平了道路，展示了下一代显示技术的巨大前景。