Germanium-lead perovskite light-emitting diodes

Dexin Yang (), Guoling Zhang, Runchen Lai, Yao Cheng, Yaxiao Lian, Min Rao, Dexuan Huo, Dongchen Lan, Baodan Zhao and Dawei Di ()
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Dexin Yang: Zhejiang University
Guoling Zhang: Zhejiang University
Runchen Lai: Zhejiang University
Yao Cheng: Hangzhou Dianzi University
Yaxiao Lian: Zhejiang University
Min Rao: Hangzhou Dianzi University
Dexuan Huo: Hangzhou Dianzi University
Dongchen Lan: Zhejiang University
Baodan Zhao: Zhejiang University
Dawei Di: Zhejiang University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract 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−2), 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.

Date: 2021
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DOI: 10.1038/s41467-021-24616-5

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