Journal
NATURE PHOTONICS
Volume 16, Issue 9, Pages 637-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41566-022-01046-3
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Funding
- National Key R&D Program of China [2018YFB2200401]
- National Natural Science Foundation of China (NSFC) [61975180, 62005243, 62005230, 61974126, 51902273, 52102177]
- Kun-Peng Programme of Zhejiang Province
- Natural Science Foundation of Zhejiang Province [LR21F050003]
- Natural Science Foundation of Fujian Province [2021J06009]
- Natural Science Foundation of Jiangsu Province [BK20210313]
- Top-Notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP)
- Jiangsu Specially-Appointed Professor Program
- Fundamental Research Funds for the Central Universities [2020QNA5002, 2021FZZX001-08, 20720200086, 20720210088]
- Zhejiang University Education Foundation Global Partnership Fund
- College of Optical Science and Engineering (Zhejiang University)
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This study demonstrates ultrastable and efficient perovskite light-emitting diodes for near-infrared light source. The introduction of a dipolar molecular stabilizer enhances the stability by preventing phase transformation and decomposition of the perovskite.
Perovskite light-emitting diodes are an emerging light source technology. However, similar to perovskite solar cells, poor operational stability remains an obstacle for commercial applications. Here we demonstrate ultrastable and efficient near-infrared (similar to 800 nm) perovskite light-emitting diodes with record-long operational lifetimes (T-50 extrapolated) of 11,539 h (similar to 1.3 years) and 32,675 h (similar to 3.7 years) for initial radiance (or current densities) of 3.7 W sr(-1) m(-2) (similar to 5.0 mA cm(-2)) and 2.1W sr(-1) m(-2) (similar to 3.2 mA cm(-2)), respectively, with even longer lifetimes forecasted for lower radiance. Key to this stability is the introduction of a dipolar molecular stabilizer, which interacts with the cations and anions at the perovskite grain boundaries. This suppresses ion migration under electric fields, preventing the formation of lead iodide, which mediates the phase transformation and decomposition of alpha-FAPbI(3) perovskite. These results remove the critical concern that halide perovskite devices may be intrinsically unstable, paving the path towards industrial applications.
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