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Transcending the slow bimolecular recombination in lead-halide perovskites for electroluminescence
Open accessAbstract
The slow bimolecular recombination that drives three-dimensional lead-halide perovskites’ outstanding photovoltaic performance is conversely a fundamental limitation for electroluminescence. Under electroluminescence working conditions with typical charge densities lower than 10 15 cm−3, defect-states trapping in three-dimensional perovskites competes effectively with the bimolecular radiative recombination. Herein, we overcome this limitation using van-der-Waals-coupled Ruddlesden-Popper perovskite multi-quantum-wells. Injected charge carriers are rapidly localized from adjacent thin few layer (n≤4) multi-quantum-wells to the thick (n≥5) multi-quantum-wells with extremely high efficiency (over 85%) through quantum coupling. Light emission originates from excitonic recombination in the thick multi-quantum-wells at much higher decay rate and efficiency than bimolecular recombination in three-dimensional perovskites. These multi-quantum-wells retain the simple solution processability and high charge carrier mobility of two-dimensional lead-halide perovskites. Importantly, these Ruddlesden-Popper perovskites offer new functionalities unavailable in single phase constituents, permitting the transcendence of the slow bimolecular recombination bottleneck in lead-halide perovskites for efficient electroluminescence.
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Metadata
- Authors
- Xing, G., Wu, B., Wu, X., Li, M., Du, B., Wei, Q., Guo, J., Yeow, E. K. L., Sum, T. C., & Huang, W.
- Venue
- Nature Communications
- Published
- 2017-02-27
- Volume
- 8
- Issue
- 1
- Pages
- 14558-14558
- ISSN
- 2041-1723 (ISSN-L)
- OpenAlex
- W2592943572
- Cited by
- 601
- References
- 35
- FWCI
- 26.29
- Type
- journal article
- Language
- en
- Open access
- gold
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