Improving Broadband White-light Emission Performances of 2D Perovskites by Subtly Regulating Organic Cations.
Improving Broadband White-light Emission Performances of 2D Perovskites by Subtly Regulating Organic Cations.
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DOI：
10.1002/chem.202001178
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发表时间：
2020-05
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通讯作者：
Chang‐Qing Jing;Juan Wang;Hui-Fang Zhao;Wen-Xin Chu;Yun Yuan;Zhi Wang;Meng‐Fei Han;T. Xu;Jian‐Qiang Zhao;X. Lei
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作者：
Chang‐Qing Jing;Juan Wang;Hui-Fang Zhao;Wen-Xin Chu;Yun Yuan;Zhi Wang;Meng‐Fei Han;T. Xu;Jian‐Qiang Zhao;X. Lei
近年来，二维（2D）有机-无机杂化卤化铅钙钛矿作为单组分白光发光材料在固态发光领域受到广泛关注，通过精确的结构设计策略合理优化其光致发光性能仍具有重要意义。本文通过精心选择同源脂肪族胺作为模板，合理设计了[DMEDA]PbCl 4(1)和[DMPDA]PbCl 4(2)两种同型钙钛矿，表现出可调、稳定的宽带蓝白光发射特性。有趣的是，有机阳离子的微妙调节导致2D [PbCl 4] 2-层的畸变水平更高，光致发光量子效率（PLQEs）提高（1 <1%,2 < 4.9%）。基于结构表征、时间分辨PL、温度依赖PL发射、理论计算等方面的详细研究，可以将宽带光发射归因于自捕获激子（STEs）。本研究为合理优化低维卤化物钙钛矿的PL性能提供了新的指导，并为探讨结构-性能关系提供了平台。
Recently, two-dimensional (2D) organic-inorganic hybrid lead halide perovskites have attracted intensive attentions in solid state luminous fields as single-component white light emitters, and it is still significant to rationally optimize the photoluminescence (PL) performances through accurate structural design strategies. Herein, by carefully choosing homologous aliphatic amines as templates, we rationally designed two isotypical perovskites, [DMEDA]PbCl 4 ( 1 ) and [DMPDA]PbCl 4 ( 2 ), displaying tunable and stable broadband bluish white-light emission properties. Intriguingly, the subtle regulation on organic cations leads to higher distortion levels of 2D [PbCl 4 ] 2- layers and enhanced photoluminescence quantum efficiencies (PLQEs) (<1% for 1 and 4.9% for 2 ). The broadband light emissions can be ascribed to the self-trapped excitons (STEs) based on detailed studies of structural characterizations, time-resolved PL, temperature-dependent PL emissions, theoretical calculation and so on. This work gives a new guidance to rationally optimize the PL properties of low-dimensional halide perovskites and affords a platform to probe into the structure-property relationship.