Germanium-lead perovskite light-emitting diodes.
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Yang, D., Zhang, G., Lai, R., Cheng, Y., Lian, Y., Rao, M., Huo, D., et al. (2021). Germanium-lead perovskite light-emitting diodes.. Nature communications, 12 (1)https://doi.org/10.1038/s41467-021-24616-5
Reducing environmental impact is a key challenge for perovskite optoelectronics, as most high-performance devices are based on potentially toxic lead-halide perovskites. For photovoltaic solar cells, tin-lead (Sn-Pb) perovskite materials provide a promising solution for reducing toxicity. However, Sn-Pb perovskites typically exhibit low luminescence efficiencies, and are not ideal for light-emitting applications. Here we demonstrate highly luminescent germanium-lead (Ge-Pb) perovskite films with photoluminescence quantum efficiencies (PLQEs) of up to ~71%, showing a considerable relative improvement of ~34% over similarly prepared Ge-free, Pb-based perovskite films. In our initial demonstration of Ge-Pb perovskite LEDs, we achieve external quantum efficiencies (EQEs) of up to ~13.1% at high brightness (~1900 cd m<sup>-2</sup>), a step forward for reduced-toxicity perovskite LEDs. Our findings offer a new solution for developing eco-friendly light-emitting technologies based on perovskite semiconductors.
Natural Science Foundation of Zhejiang Province (Zhejiang Provincial Natural Science Foundation) (LR21F050003)
National Natural Science Foundation of China (National Science Foundation of China) (61975180, 62005243)
External DOI: https://doi.org/10.1038/s41467-021-24616-5
This record's URL: https://www.repository.cam.ac.uk/handle/1810/326794
Attribution 4.0 International
Licence URL: https://creativecommons.org/licenses/by/4.0/