Germanium-lead perovskite light-emitting diodes

Dexin Yang; Guoling Zhang; Runchen Lai; Yao Cheng; Yaxiao Lian; Min Rao; Dexuan Huo; Dongchen Lan; Baodan Zhao; Dawei Di

doi:10.1038/s41467-021-24616-5

Germanium-lead perovskite light-emitting diodes

Nat Commun. 2021 Jul 13;12(1):4295. doi: 10.1038/s41467-021-24616-5.

Authors

Dexin Yang^#^{1

2}, Guoling Zhang^#³, Runchen Lai³, Yao Cheng⁴, Yaxiao Lian³, Min Rao⁴, Dexuan Huo⁴, Dongchen Lan⁵, Baodan Zhao^{3

6

7}, Dawei Di^{8

9

10}

Affiliations

¹ State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering; International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, China. dy263@hdu.edu.cn.
² Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou, China. dy263@hdu.edu.cn.
³ State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering; International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, China.
⁴ Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou, China.
⁵ College of Electrical Engineering, Zhejiang University, Hangzhou, China.
⁶ Key Laboratory of Excited-State Materials of Zhejiang Province, Zhejiang University, Hangzhou, China.
⁷ Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
⁸ State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering; International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, China. daweidi@zju.edu.cn.
⁹ Key Laboratory of Excited-State Materials of Zhejiang Province, Zhejiang University, Hangzhou, China. daweidi@zju.edu.cn.
¹⁰ Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom. daweidi@zju.edu.cn.

^# Contributed equally.

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.

Abstract

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