Low Temperature Solution-Processable Cesium Lead Bromide Microcrystals for Light Conversion
Low Temperature Solution-Processable Cesium Lead Bromide Microcrystals for Light Conversion
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DOI：
10.1021/acs.cgd.8b00264
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发表时间：
2018-04
影响因子：
3.8
通讯作者：
Q. Le;Jong Won Lee;W. Sohn;Ho Won Jang;J. Kim;S. Y. Kim
中科院分区：
文献类型：
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作者：
Q. Le;Jong Won Lee;W. Sohn;Ho Won Jang;J. Kim;S. Y. Kim
在这篇报告中，我们提出了一种新的方法来制备和应用的Cs4 PbBr 6微晶（Cs4 PbBr 6 MCs）。通过引入HBr（HBr，48%水溶液），经由PbBr 2：CsBr的反溶剂诱导结晶直接在二甲基亚砜（DMSO）中合成Cs4 PbBr 6 MCs。HBr和DMSO的比例在Cs4 PbBr 6的形成中起着至关重要的作用。通过控制HBr/DMSO的比例，可以获得纯Cs4 PbBr 6或CsPbBr 3相。最初通过将HBr添加到CsBr：PbBr 2/DMSO中获得Cs4 PbBr 6 MC。然而，随着添加的HBr的量的增加，Cs 4PbBr 6 MCs转化为Cs PbBr 3 MCs，光致发光（PL）消失。还发现，通过简单地向干燥的CsPbBr 3 MCs中加入DMSO，CsPbBr 3 MCs可以转化为Cs4 PbBr 6 MCs。Cs_4PbBr_6微胶囊在516 nm处有较强的荧光，半峰全宽为25 nm，与晶体尺寸无关（5-10 μm）。研究了Cs4 PbBr 6微胶囊作为紫外发光二极管的光转换体时，荧光强度的变化规律。
In this report, we present a new approach for the fabrication and application of Cs4PbBr6 microcrystals (Cs4PbBr6 MCs). The Cs4PbBr6 MCs are synthesized via an anti-solvent induced crystallization of PbBr2:CsBr directly in dimethylsulfoxide (DMSO) by introducing HBr (HBr, 48% aqueous solution). The ratio of HBr and DMSO plays a vital role in the formation of Cs4PbBr6. By controlling the HBr/DMSO ratio, pure Cs4PbBr6 or the CsPbBr3 phase can be obtained. The Cs4PbBr6 MCs were initially obtained by adding HBr to CsBr:PbBr2/DMSO. However, on increasing the amount of the added HBr, Cs4PbBr6 MCs were converted to CsPbBr3 MCs and the photoluminescence (PL) disappeared. It was also found that CsPbBr3 MCs can be transformed to Cs4PbBr6 MCs by simply adding DMSO to the dried CsPbBr3 MCs. The Cs4PbBr6 MCs exhibit a strong PL at 516 nm with a full width at half-maximum of 25 nm regardless of the crystal size (5–10 μm). On using Cs4PbBr6 MCs as a light converter in ultraviolet light emitting diodes, a PL intensity th...