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Title: Transcending the slow bimolecular recombination in lead-halide perovskites for electroluminescence
Authors: Huang, Wei
Xing, Guichuan
Wu, Bo
Wu, Xiangyang
Li, Mingjie
Du, Bin
Wei, Qi
Guo, Jia
Yeow, Edwin K. L.
Sum, Tze Chien
Keywords: Materials for Devices
Optical Physics
Issue Date: 2017
Source: Xing, G., Wu, B., Wu, X., Li, M., Du, B., Wei, Q., et al. (2017). Transcending the slow bimolecular recombination in lead-halide perovskites for electroluminescence. Nature Communications, 8, 14558-.
Series/Report no.: Nature Communications
Abstract: 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 1015 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.
ISSN: 2041-1723
DOI: 10.1038/ncomms14558
Schools: School of Physical and Mathematical Sciences 
Rights: © 2017 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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