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Proton-transfer-induced 3D/2D hybrid perovskites suppress ion migration and reduce luminance overshoot

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Abstract: 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.



Article, /639/638, /639/301, /639/624, /639/766, /128, /119, /120, /147/135, /147/137, /140/131, /140/125, /145, article

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Nature Communications

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Nature Publishing Group UK
Ministry of Science, ICT and Future Planning (MSIP) (NRF-2016R1A3B1908431, NRF-2014M3A6A7060583, 2017R1A2A1A17069511)