Cs4PbX6 (X = Cl, Br, I) Nanocrystals: Preparation, Water-Triggered Transformation Behavior, and Anti-Counterfeiting Application
Cs4PbX6 (X = Cl, Br, I) Nanocrystals: Preparation, Water-Triggered Transformation Behavior, and Anti-Counterfeiting Application
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Cs4PbX6 (X = Cl, Br, I) 纳米晶体的制备、水触发转化行为和防伪应用
DOI：
10.1021/acs.langmuir.8b01683
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发表时间：
2018-09-04
期刊：
影响因子：
3.9
通讯作者：
Zhang, Qiao
中科院分区：
文献类型：
--
作者：
Yu, Xiaoya;Wu, Linzhong;Zhang, Qiao
作为一种有前景的材料，Cs4PbX6（X=Cl、Br、I）纳米晶（NCs）引起了广泛关注。然而，它们的发光特性仍然存在争议。在这项工作中，我们首先系统地研究了Cs4PbX6 NCs的胶体制备。研究发现Cs4PbX6 NCs形成的关键参数是Cs和Pb的比例。纯 Cs4PbX6 NC 不发光。之前报道的Cs4PbX6 NCs的发光特性可能来自于发光CsPbX3 NCs的杂质。在一个纳米颗粒中没有发现 Cs4PbX6 和 CsPbX3 相共存。定量研究了水引发的从不发光 Cs4PbX6 NC 到发光 CsPbX3 NC 的转变。 Cs4PbX6 NCs在湿度传感器和防伪方面的潜在应用已经得到证实。这项工作很重要，因为它不仅证实了 Cs4PbX6 NC 的不发光性质，而且证明了此类 NC 的潜在应用。
As a promising material, Cs4PbX6 (X = Cl, Br, I) nanocrystals (NCs) have attracted much attention. However, their luminescent property is still under debate. In this work, we first systematically studied the colloidal preparation of Cs4PbX6 NCs. It is found that the critical parameter for the formation of Cs4PbX6 NCs is the ratio between Cs and Pb. Pure Cs4PbX6 NCs are nonluminescent. The luminescence property of previous reported Cs4PbX6 NCs may come from the impurity of luminescent CsPbX3 NCs. No coexistence of both Cs4PbX6 and CsPbX3 phase has been found in one single nanoparticle. The water triggered transformation from nonluminescent Cs4PbX6 NCs to luminescent CsPbX3 NCs has been quantitatively studied. The potential application of Cs4PbX6 NCs in humidity sensor and anticounterfeiting have been demonstrated. This work is important because it not only confirmed the nonluminescent nature of Cs4PbX6 NCs but also demonstrated the potential application of such NCs.