High-Efficiency Violet-Emitting All-Inorganic Perovskite Nanocrystals Enabled by Alkaline-Earth Metal Passivation

doi:10.1021/acs.chemmater.9b00442

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	High-Efficiency Violet-Emitting All-Inorganic Perovskite Nanocrystals Enabled by Alkaline-Earth Metal Passivation
	J.K.Chen; J.P.Ma; S.Q.Guo; Y.M.Chen; Q.Zhao; B.B.Zhang
	2019
发表期刊	Chemistry of Materials
ISSN	0897-4756
卷号	31 期号:11 页码:3974-3983
摘要	Cesium lead halide perovskite nanocrystals (NCs) have emerged as promising luminescent materials for a range of applications. However, the creation of highly luminescent violet-emitting CsPbCl3 NCs mostly relies on doping of a limited number of small-sized metal ions or post-synthetic surface treatment of NCs. Alkaline-earth (AE) metals (e.g., Ca2+, Sr2+, and Ba2+) have been proposed to be able to substitute Pb2+ in halide perovskites, yet it remains incompletely understood whether AE metal ions can be incorporated into the perovskite lattice or can be merely situated at the surface. Here, we explore the possibility of using AE metal ions for the suppression of the formation of trap centers, which leads us to develop a one-pot synthetic passivation strategy to boost the violet-emitting efficiency of CsPbCl3 NCs through the creation of a Ca2+/Sr2+ involved passivation layer. The photoluminescence quantum yield of violet emission reaches 77.1% by incorporating an optimal amount of Ca2+. A wide range of optical and structural characterizations, coupled with first-principles calculations, aid in clarifying the underlying mechanism for the AE-metal-dependent passivation of CsPbCl3 NCs. Specifically, based on the experimental and theoretical results, a model is proposed for the observed abnormal incorporation phenomenon of AE(2+) ions in NCs (i.e., Ba2+ can be incorporated into the core of NCs, Ca2+/Sr2+ can only be at/near the surface, while Mg2+ can neither be in the core nor at the surface). We believe that the knowledge gained here may not only offer a new perspective to obtain high-efficiency violet-emitting perovskite NCs through a one-pot synthetic passivation but can also help elucidate the functions that AE(2+) ions play in the optimization of perovskite optoelectronic devices.
关键词	single-photon emission,halide perovskites,quantum dots,optical-properties,anion-exchange,diodes
DOI	10.1021/acs.chemmater.9b00442
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收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/63457
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.K.Chen,J.P.Ma,S.Q.Guo,et al. High-Efficiency Violet-Emitting All-Inorganic Perovskite Nanocrystals Enabled by Alkaline-Earth Metal Passivation[J]. Chemistry of Materials,2019,31(11):3974-3983.
APA	J.K.Chen,J.P.Ma,S.Q.Guo,Y.M.Chen,Q.Zhao,&B.B.Zhang.(2019).High-Efficiency Violet-Emitting All-Inorganic Perovskite Nanocrystals Enabled by Alkaline-Earth Metal Passivation.Chemistry of Materials,31(11),3974-3983.
MLA	J.K.Chen,et al."High-Efficiency Violet-Emitting All-Inorganic Perovskite Nanocrystals Enabled by Alkaline-Earth Metal Passivation".Chemistry of Materials 31.11(2019):3974-3983.

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