Fabrication of red-emitting perovskite LEDs by stabilizing their octahedral structure

Lingmei Kong, Yuqi Sun, Bin Zhao, Kangyu Ji, Jie Feng, Jianchao Dong, Yuanzhi Wang, Zirui Liu, Shabnum Maqbool, Yunguo Li, Yingguo Yang, Linjie Dai, Wanhee Lee, Changsoon Cho, Samuel D. Stranks, Richard H. Friend, Ning Wang (), Neil C. Greenham () and Xuyong Yang ()
Additional contact information
Lingmei Kong: Shanghai University
Yuqi Sun: University of Cambridge
Bin Zhao: Jilin University
Kangyu Ji: University of Cambridge
Jie Feng: Shanghai University
Jianchao Dong: Jilin University
Yuanzhi Wang: Shanghai University
Zirui Liu: Shanghai University
Shabnum Maqbool: University of Cambridge
Yunguo Li: University of Science and Technology of China
Yingguo Yang: Chinese Academy of Sciences
Linjie Dai: University of Cambridge
Wanhee Lee: Pohang University of Science and Technology (POSTECH)
Changsoon Cho: Pohang University of Science and Technology (POSTECH)
Samuel D. Stranks: University of Cambridge
Richard H. Friend: University of Cambridge
Ning Wang: Jilin University
Neil C. Greenham: University of Cambridge
Xuyong Yang: Shanghai University

Nature, 2024, vol. 631, issue 8019, 73-79

Abstract: Abstract Light-emitting diodes (LEDs) based on metal halide perovskites (PeLEDs) with high colour quality and facile solution processing are promising candidates for full-colour and high-definition displays1–4. Despite the great success achieved in green PeLEDs with lead bromide perovskites5, it is still challenging to realize pure-red (620–650 nm) LEDs using iodine-based counterparts, as they are constrained by the low intrinsic bandgap6. Here we report efficient and colour-stable PeLEDs across the entire pure-red region, with a peak external quantum efficiency reaching 28.7% at 638 nm, enabled by incorporating a double-end anchored ligand molecule into pure-iodine perovskites. We demonstrate that a key function of the organic intercalating cation is to stabilize the lead iodine octahedron through coordination with exposed lead ions and enhanced hydrogen bonding with iodine. The molecule synergistically facilitates spectral modulation, promotes charge transfer between perovskite quantum wells and reduces iodine migration under electrical bias. We realize continuously tunable emission wavelengths for iodine-based perovskite films with suppressed energy loss due to the decrease in bond energy of lead iodine in ionic perovskites as the bandgap increases. Importantly, the resultant devices show outstanding spectral stability and a half-lifetime of more than 7,600 min at an initial luminance of 100 cd m−2.

Date: 2024
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DOI: 10.1038/s41586-024-07531-9

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