Synthesis of Composition Tunable and Highly Luminescent Cesium Lead Halide Nanowires through Anion-Exchange Reactions

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• 作者：Dandan Zhang ; Yiming Yang ; Yehonadav Bekenstein ; Yi Yu ; Natalie A. Gibson ; Andrew B. Wong ; Samuel W. Eaton ; Nikolay Kornienko ; Qiao Kong ; Minliang Lai ; A. Paul Alivisatos ; Stephen R. Leone ; Peidong Yang
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：June 15, 2016
• 年：2016
• 卷：138
• 期：23
• 页码：7236-7239
• 全文大小：343K
• 年卷期：0
• ISSN：1520-5126

文摘

Here, we demonstrate the successful synthesis of brightly emitting colloidal cesium lead halide (CsPbX₃, X = Cl, Br, I) nanowires (NWs) with uniform diameters and tunable compositions. By using highly monodisperse CsPbBr₃ NWs as templates, the NW composition can be independently controlled through anion-exchange reactions. CsPbX₃ alloy NWs with a wide range of alloy compositions can be achieved with well-preserved morphology and crystal structure. The NWs are highly luminescent with photoluminescence quantum yields (PLQY) ranging from 20% to 80%. The bright photoluminescence can be tuned over nearly the entire visible spectrum. The high PLQYs together with charge transport measurements exemplify the efficient alloying of the anionic sublattice in a one-dimensional CsPbX₃ system. The wires increased functionality in the form of fast photoresponse rates and the low defect density suggest CsPbX₃ NWs as prospective materials for optoelectronic applications.