High-efficiency, long-lived lead-free perovskite light-emitting diodes.

Authors

Wenhao Bai, Tongtong Xuan, Guanhua Ren, Kunjie Song, Huili Li, Chengkai Hu, Fandi Mo, Lixin Wang, Rong-Jun Xie

Published in

Science (New York, N.Y.). Volume 393. Issue 6814. Pages 882-887. Aug 27, 2026. Epub Aug 27, 2026.

Abstract

Tin halide perovskite light-emitting diodes (PeLEDs) offer promise due to their solution processability and low toxicity, yet low efficiency and poor stability hinder practical use. We found that electroluminescence failure in CsSnI₃ is primarily driven by excessive hole injection-triggered electrochemical Sn²⁺ oxidation and an irreversible phase transition to Cs₂SnI₆. Through a dual-side optimization strategy combining formamidine doping with triphenylphosphine oxide modification to stabilize the perovskite lattice, suppress nonradiative recombination, and balance carrier transport, we demonstrate highly efficient near-infrared PeLEDs. These lead-free devices achieve a peak external quantum efficiency of 21.2% at 963 nanometers and a maximum radiance of 195.8 watts per steradian per square meter (W sr^-1 m^-2). Notably, the operating half-lifetime reaches 920.5 hours at 7.1 W sr^-1 m^-2, providing pathways for high-performance lead-free PeLEDs.

PMID:
42658957
Bibliographic data and abstract were imported from PubMed on 28 Aug 2026.

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