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.
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We thank X. Peng (Zhejiang University, China) for valuable advice. We also thank L. Jiang (Institute of Chemistry, Chinese Academy of Sciences) for assistance with the UPS analyses. Portion of the work is carried out at beamline 7.3.3 at the Advanced Light Source, Lawrence Berkeley National Laboratory, which was supported by the US Department of Energy, Office of Science, and Office of Basic Energy Sciences. We acknowledge financial support from the National Natural Science Foundation of China (21975220 and 91833303 (Y.J.); 21922305, 21873080 and 21703202 (L.W.)), Key Research and Development Program of Zhejiang Province (2020C01001 (Y.J.)), Guangdong Major Project of Basic and Applied Basic Research (2019B030302007 (L.Y. and F.H.)), Fundamental Research Funds for the Central Universities (2020XZZX002-06 (L.W.)) and China Postdoctoral Science Foundation (2021M702800 (Y.D.)).
The authors declare no competing interests.
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Deng, Y., Peng, F., Lu, Y. et al. Solution-processed green and blue quantum-dot light-emitting diodes with eliminated charge leakage. Nat. Photon. (2022). https://doi.org/10.1038/s41566-022-00999-9