TY - JOUR
T1 - High-efficiency, long-lived lead-free perovskite light-emitting diodes
AU - Bai, Wenhao
AU - Xuan, Tongtong
AU - Ren, Guanhua
AU - Song, Kunjie
AU - Li, Huili
AU - Hu, Chengkai
AU - Mo, Fandi
AU - Wang, Lixin
AU - Xie, Rong Jun
PY - 2026/8/27
Y1 - 2026/8/27
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/105048785928
U2 - 10.1126/science.aeg8955
DO - 10.1126/science.aeg8955
M3 - 文章
C2 - 42658957
AN - SCOPUS:105048785928
SN - 1095-9203
VL - 393
SP - 882
EP - 887
JO - Science (New York, N.Y.)
JF - Science (New York, N.Y.)
IS - 6814
ER -