期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-020-17072-0
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资金
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Science, ICT & Future Planning) [NRF-2016R1A3B1908431]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) of Korea [NRF-2014M3A6A7060583]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2017R1A2A1A17069511]
- SUNRISE project [EP/P032591/1]
- EPSRC
- UKIERI project
- Royal Society Newton International Fellowship
- EPSRC [EP/P032591/1] Funding Source: UKRI
Perovskite light-emitting diodes (PeLEDs) based on three-dimensional (3D) polycrystalline perovskites suffer from ion migration, which causes overshoot of luminance over time during operation and reduces its operational lifetime. Here, we demonstrate 3D/2D hybrid PeLEDs with extremely reduced luminance overshoot and 21 times longer operational lifetime than 3D PeLEDs. The luminance overshoot ratio of 3D/2D hybrid PeLED is only 7.4% which is greatly lower than that of 3D PeLED (150.4%). The 3D/2D hybrid perovskite is obtained by adding a small amount of neutral benzylamine to methylammonium lead bromide, which induces a proton transfer from methylammonium to benzylamine and enables crystallization of 2D perovskite without destroying the 3D phase. Benzylammonium in the perovskite lattice suppresses formation of deep-trap states and ion migration, thereby enhances both operating stability and luminous efficiency based on its retardation effect in reorientation.
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