Reduced Efficiency Roll-Off and Enhanced Stability in Perovskite Light-Emitting Diodes with Multiple Quantum Wells

Ming Yang; Nana Wang; Shuting Zhang; Wei Zou; Yarong He; Yingqiang Wei; Mengmeng Xu; Jianpu Wang; Wei Huang

doi:10.1021/acs.jpclett.8b00600

Reduced Efficiency Roll-Off and Enhanced Stability in Perovskite Light-Emitting Diodes with Multiple Quantum Wells

Ming Yang, Nana Wang, Shuting Zhang, Wei Zou, Yarong He, Yingqiang Wei, Mengmeng Xu, Jianpu Wang, Wei Huang

柔性电子（未来科技）学院|先进材料研究院

科研成果: 期刊稿件 › 文章 › 同行评审

58 引用（Scopus）

摘要

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 ∼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 ∼31 h under a constant current density of 10 mA cm^-2.

源语言	英语
页（从-至）	2038-2042
页数	5
期刊	Journal of Physical Chemistry Letters
卷	9
期	8
DOI	https://doi.org/10.1021/acs.jpclett.8b00600
出版状态	已出版 - 19 4月 2018

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abstract = "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 ∼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 ∼31 h under a constant current density of 10 mA cm-2.",

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AU - Yang, Ming

AU - Wang, Nana

AU - Zhang, Shuting

AU - Zou, Wei

AU - He, Yarong

AU - Wei, Yingqiang

AU - Xu, Mengmeng

AU - Wang, Jianpu

AU - Huang, Wei

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N2 - 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 ∼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 ∼31 h under a constant current density of 10 mA cm-2.

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Reduced Efficiency Roll-Off and Enhanced Stability in Perovskite Light-Emitting Diodes with Multiple Quantum Wells

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