Fast Anion-Exchange in Highly Luminescent Nanocrystals of Cesium Lead Halide Perovskites (CsPbX3, X = Cl, Br, I).
Fast Anion-Exchange in Highly Luminescent Nanocrystals of Cesium Lead Halide Perovskites (CsPbX3, X = Cl, Br, I).
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DOI：
10.1021/acs.nanolett.5b02404
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发表时间：
2015-08-12
期刊：
影响因子：
10.8
通讯作者：
Kovalenko MV
中科院分区：
文献类型：
--
作者：
Nedelcu G;Protesescu L;Yakunin S;Bodnarchuk MI;Grotevent MJ;Kovalenko MV
胶体纳米晶体的合成后化学转化，如离子交换反应，提供了一种途径，以组成微调或以其他方式难以获得的材料和形态。虽然阳离子交换是容易和常见的，但阴离子交换反应尚未得到实质性的部署。在这里，我们报告快速，低温，故意部分，或完全的阴离子交换在高度发光的半导体纳米晶体的铯铅卤化物钙钛矿（CsPbX 3，X = Cl，Br，I）。通过调节胶体荧光溶液中的卤化物比例，可以在整个可见光谱区域（410-700 nm）内调节明亮的光致发光，同时保持20-80%的高量子产率和10-40 nm的窄发射线宽（从蓝色到红色）。此外，快速的离子间阴离子交换被证明，导致均匀的CsPb（Cl/Br）3或CsPb（Br/I）3组成简单地通过混合CsPbCl 3，CsPbBr 3，和CsPbI 3纳米晶体以适当的比例。
Postsynthetic chemical transformations of colloidal nanocrystals, such as ion-exchange reactions, provide an avenue to compositional fine-tuning or to otherwise inaccessible materials and morphologies. While cation-exchange is facile and commonplace, anion-exchange reactions have not received substantial deployment. Here we report fast, low-temperature, deliberately partial, or complete anion-exchange in highly luminescent semiconductor nanocrystals of cesium lead halide perovskites (CsPbX3, X = Cl, Br, I). By adjusting the halide ratios in the colloidal nanocrystal solution, the bright photoluminescence can be tuned over the entire visible spectral region (410–700 nm) while maintaining high quantum yields of 20–80% and narrow emission line widths of 10–40 nm (from blue to red). Furthermore, fast internanocrystal anion-exchange is demonstrated, leading to uniform CsPb(Cl/Br)3 or CsPb(Br/I)3 compositions simply by mixing CsPbCl3, CsPbBr3, and CsPbI3 nanocrystals in appropriate ratios.