Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-11567-1
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Funding
- Joint Research Program between China and European Union [2016YFE0112000]
- Major Research Plan of the National Natural Science Foundation of China [91733302]
- National Basic Research Program of China-Fundamental Studies of Perovskite Solar Cells [2015CB932200]
- Natural Science Foundation of Jiangsu Province, China [BK20150043, BK20150064, BK20180085]
- National Key R&D Program of China [2016YFB0401600, 2017YFB0404500, 2018YFB0406704]
- National Natural Science Foundation of China [11474164, 61875084, 61634001, 51522209, 91433204]
- National Science Fund for Distinguished Young Scholars [61725502]
- Major Program of Natural Science Research of Jiangsu Higher Education Institutions of China [18KJA510002]
- Synergetic Innovation Center for Organic Electronics and Information Displays
- Natural Science Foundation of Zhejiang Province, China [LY17A040008]
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Solution-processable perovskites show highly emissive and good charge transport, making them attractive for low-cost light-emitting diodes (LEDs) with high energy conversion efficiencies. Despite recent advances in device efficiency, the stability of perovskite LEDs is still a major obstacle. Here, we demonstrate stable and bright perovskite LEDs with high energy conversion efficiencies by optimizing formamidinium lead iodide films. Our LEDs show an energy conversion efficiency of 10.7%, and an external quantum efficiency of 14.2% without outcoupling enhancement through controlling the concentration of the precursor solutions. The device shows low efficiency droop, i.e. 8.3% energy conversion efficiency and 14.0% external quantum efficiency at a current density of 300 mA cm(-2), making the device more efficient than state-of-the-art organic and quantum-dot LEDs at high current densities. Furthermore, the half-lifetime of device with benzylamine treatment is 23.7 hr under a current density of 100 mA cm(-2), comparable to the lifetime of near-infrared organic LEDs.
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