Suppressing Auger Recombination in Cesium Lead Bromide Perovskite Nanocrystal Film for Bright Light-Emitting Diodes

doi:10.1021/acs.jpclett.0c02777

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	Suppressing Auger Recombination in Cesium Lead Bromide Perovskite Nanocrystal Film for Bright Light-Emitting Diodes
	J. S. Yao,J. C. Zhang,L. Wang,K. H. Wang,X. C. Ru,J. N. Yang,J. J. Wang,X. Chen,Y. H. Song,Y. C. Yin,Y. F. Lan,Q. Zhang and H. B. Yao
	2020
发表期刊	Journal of Physical Chemistry Letters
ISSN	1948-7185
卷号	11 期号:21 页码:9371-9378
摘要	All-inorganic cesium lead halide perovskite colloidal nanocrystals are attractive for next-generation light-emitting diodes because of their high color purity, but the nonradiative Auger recombination in perovskite nanocrystal film limits the efficiency and brightness of the fabricated devices. Here, we introduce a surface-engineering process to exchange the original long-chain oleic acid/oleylamine ligands by the cerium-tributylphosphine oxide hybrid ligands to suppress nonradiative Auger recombination in CsPbBr3 NC film for bright and low-efficiency roll-off light-emitting diodes. Using ultrafast transient absorption and time-resolved photoluminescence spectroscopy, we demonstrate that the hybrid ligand passivation can efficiently remove surface trap states to enhance radiative recombination and homogenize the exciton concentration to suppress nonradiative Auger recombination in the CsPbBr3 nanocrystal thin film. Consequently, we fabricate a light-emitting diode with efficient charge injection into the CsPbBr3 nanocrystal emitting layer, achieving a pronounced improvement of electroluminescence with an external quantum efficiency from 5.5% to 9.1%. More importantly, the efficiency roll-off characteristics of high-brightness light-emitting diodes is effectively mitigated. Our reported hybrid ligand passivation suppressed Auger recombination strategy shows a great potential for fabricating high-brightness cesium lead halide perovskite light-emitting diodes.
DOI	10.1021/acs.jpclett.0c02777
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收录类别	SCI ; EI
语种	英语
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/64929
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	J. S. Yao,J. C. Zhang,L. Wang,K. H. Wang,X. C. Ru,J. N. Yang,J. J. Wang,X. Chen,Y. H. Song,Y. C. Yin,Y. F. Lan,Q. Zhang and H. B. Yao. Suppressing Auger Recombination in Cesium Lead Bromide Perovskite Nanocrystal Film for Bright Light-Emitting Diodes[J]. Journal of Physical Chemistry Letters,2020,11(21):9371-9378.
APA	J. S. Yao,J. C. Zhang,L. Wang,K. H. Wang,X. C. Ru,J. N. Yang,J. J. Wang,X. Chen,Y. H. Song,Y. C. Yin,Y. F. Lan,Q. Zhang and H. B. Yao.(2020).Suppressing Auger Recombination in Cesium Lead Bromide Perovskite Nanocrystal Film for Bright Light-Emitting Diodes.Journal of Physical Chemistry Letters,11(21),9371-9378.
MLA	J. S. Yao,J. C. Zhang,L. Wang,K. H. Wang,X. C. Ru,J. N. Yang,J. J. Wang,X. Chen,Y. H. Song,Y. C. Yin,Y. F. Lan,Q. Zhang and H. B. Yao."Suppressing Auger Recombination in Cesium Lead Bromide Perovskite Nanocrystal Film for Bright Light-Emitting Diodes".Journal of Physical Chemistry Letters 11.21(2020):9371-9378.

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