Stable and bright formamidinium-based perovskite light-emitting diodes with high energy conversion efficiency

Yanfeng Miao, You Ke, Nana Wang, Wei Zou, Mengmeng Xu, Yu Cao, Yan Sun, Rong Yang, Ying Wang, Yunfang Tong, Wenjie Xu, Liangdong Zhang, Renzhi Li, Jing Li, Haiping He, Yizheng Jin, Feng Gao, Wei Huang () and Jianpu Wang ()
Additional contact information
Yanfeng Miao: Nanjing Tech University (NanjingTech)
You Ke: Nanjing Tech University (NanjingTech)
Nana Wang: Nanjing Tech University (NanjingTech)
Wei Zou: Nanjing Tech University (NanjingTech)
Mengmeng Xu: Nanjing Tech University (NanjingTech)
Yu Cao: Nanjing Tech University (NanjingTech)
Yan Sun: Nanjing Tech University (NanjingTech)
Rong Yang: Nanjing Tech University (NanjingTech)
Ying Wang: Nanjing Tech University (NanjingTech)
Yunfang Tong: Nanjing Tech University (NanjingTech)
Wenjie Xu: Nanjing Tech University (NanjingTech)
Liangdong Zhang: Nanjing Tech University (NanjingTech)
Renzhi Li: Nanjing Tech University (NanjingTech)
Jing Li: Zhejiang University
Haiping He: Zhejiang University
Yizheng Jin: Zhejiang University
Feng Gao: Linköping University
Wei Huang: Nanjing Tech University (NanjingTech)
Jianpu Wang: Nanjing Tech University (NanjingTech)

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract 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.

Date: 2019
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DOI: 10.1038/s41467-019-11567-1

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