Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 9, Issue 8, Pages 2038-2042Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b00600
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Funding
- 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]
- Joint Research Program between China and European Union [2016YFE0112000]
- National Key Research and Development Program of China [2017YFB0404501]
- Jiangsu Natural Science Foundation [BK20150043]
- National Natural Science Foundation of China [11474164, 61405091, 61634001]
- National Science Fund for Distinguished Young Scholars [61725502]
- Synergetic Innovation Center for Organic Electronics and Information Displays
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Mixed-formamidinium (FA) and-cesium (Cs) cations were used to fabricate multiple quantum well (MQW) perovskite light-emitting diodes (PeLEDs). The partial substitution of FA with Cs facilitates the formation of wider quantum wells, which can effectively reduce efficiency roll-off by suppressing Auger recombination. The device has a peak external quantum efficiency (EQE) of 7.8% at a current density of 125 mA cm(-2), maintaining an EQE of similar to 6.6% at a high current density of 500 mA cm(-2). Due to the improved stability of mixed-cation structure, we achieve a PeLED device with a lifetime of similar to 31 h under a constant current density of 10 mA cm(-2).
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