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Proton-transfer-induced 3D/2D hybrid perovskites suppress ion migration and reduce luminance overshoot
Cited 89 time in
Web of Science
Cited 115 time in Scopus
- Authors
- Issue Date
- 2020-07
- Publisher
- Nature Publishing Group
- Citation
- Nature Communications, Vol.11 No.1, p. 3378
- 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.
- ISSN
- 2041-1723
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