Metal halide perovskites have shown promising optoelectronic properties suitable for light-emitting applications. The development of perovskite light-emitting diodes (PeLEDs) has progressed rapidly over the past several years, reaching high external quantum efficiencies of over 20%. In this Review, we focus on the key requirements for high-performance PeLEDs, highlight recent advances on materials and devices, and emphasize the importance of reliable characterization of PeLEDs. We discuss possible approaches to improve the performance of blue and red PeLEDs, increase the long-term operational stability and reduce toxicity hazards. We also provide an overview of the application space made possible by recent developments in high-efficiency PeLEDs.
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We thank O. Inganäs, J. Qin and N. K. Kumawat for discussions. We acknowledge financial support from a European Research Council Starting Grant (no. 717026), the Swedish Energy Agency Energimyndigheten (no. 48758-1), the Swedish Foundation for International Cooperation in Research and Higher Education (no. CH2018-7736), and the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No. 2009-00971). R.H.F. acknowledges support from the UK Engineering and Physical Sciences Research Council. J.W. acknowledges financial support from the Joint Research Program between China and the European Union (2016YFE0112000). Y.J. acknowledges support from the National Key Research and Development Program of China (2016YFB0401600) and the National Natural Science Foundation of China (21975220, 91833303, 91733302 and 51911530155). X.-K.L. is a Marie Skłodowska-Curie Fellow (no. 798861). F.G. is a Wallenberg Academy Fellow.
R.H.F. is a director of Helio Display Materials Ltd. The other authors declare no competing interests.
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Liu, XK., Xu, W., Bai, S. et al. Metal halide perovskites for light-emitting diodes. Nat. Mater. 20, 10–21 (2021). https://doi.org/10.1038/s41563-020-0784-7
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