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Evolution and Mechanism of Cesium Lead Bromide Nanostructures in Oleylamine-Rich System by Hot-Injection Method
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2022-10-20 , DOI: 10.1002/admi.202201916 Huazheng Li 1 , Wangwei Lu 1 , Gaoling Zhao 1 , Bin Song 2 , Weixia Dong 1, 3 , Gaorong Han 1
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2022-10-20 , DOI: 10.1002/admi.202201916 Huazheng Li 1 , Wangwei Lu 1 , Gaoling Zhao 1 , Bin Song 2 , Weixia Dong 1, 3 , Gaorong Han 1
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Due to the ultrafast nucleation and growth rates of perovskite nanostructures during the synthesis, the products are difficult to control, such as its derivatives (e.g., Cs4PbBr6) often appear. Here, the hot-injection method is ameliorated by using oleylamine (OAm) instead of octadecene as solvent. The results reveal that in OAm-rich system, the pure nanostructures with different Pb/Br ratios (CsBr, Cs4PbBr6, and CsPbBr3) can be obtained at different reaction temperatures, and thus controlling the Pb-Br linkage and the interconnection of [PbBr6]4− octahedra, and resulting in the formation of different nanostructures. As the reaction temperature increases from 120 to 180 °C, the products change from lead-free CsBr nanocrystals to poor-lead Cs4PbBr6 nanocrystals and finally to normal CsPbBr3 nanocubes and nanowires. Moreover, the synthesized CsPbBr3 nanowires exhibit an emission peak at 521 nm, full width at half maximum (FWHM) of 19 nm, with photoluminescence quantum yields (PLQY) of 64.9%, and high stability. Furthermore, the white light-emitting diode (WLED) devices are successfully fabricated based on the obtained CsPbBr3 nanowires, showing high-intensity white light and high stability without any encapsulation. Remarkably, this work provides a new approach for elucidating the synthesis mechanism of perovskite nanomaterials and their applications.
中文翻译：
热注入法富油胺体系中溴化铯铅纳米结构的演化与机理
由于钙钛矿纳米结构在合成过程中超快的成核和生长速率，产物难以控制，例如其衍生物（例如Cs 4 PbBr 6）经常出现。在这里，通过使用油胺 (OAm) 代替十八碳烯作为溶剂改进了热注射方法。结果表明，在富含OAm的体系中，可以在不同的反应温度下获得具有不同Pb/Br比（CsBr、Cs 4 PbBr 6和CsPbBr 3 ）的纯纳米结构，从而控制Pb-Br键和互连[PbBr 6 ] 4−八面体，并导致形成不同的纳米结构。随着反应温度从120℃升高到180℃，产物从无铅CsBr纳米晶转变为贫铅Cs 4 PbBr 6纳米晶，最后转变为普通的CsPbBr 3纳米立方体和纳米线。此外，合成的CsPbBr 3纳米线在521 nm处具有发射峰，半峰全宽（FWHM）为19 nm，光致发光量子产率（PLQY）为64.9%，稳定性高。此外，基于获得的 CsPbBr 3成功制造了白光发光二极管 (WLED) 器件纳米线，显示高强度白光和高稳定性，无需任何封装。值得注意的是，这项工作为阐明钙钛矿纳米材料的合成机理及其应用提供了一种新方法。
更新日期：2022-10-20
中文翻译：
热注入法富油胺体系中溴化铯铅纳米结构的演化与机理
由于钙钛矿纳米结构在合成过程中超快的成核和生长速率，产物难以控制，例如其衍生物（例如Cs 4 PbBr 6）经常出现。在这里，通过使用油胺 (OAm) 代替十八碳烯作为溶剂改进了热注射方法。结果表明，在富含OAm的体系中，可以在不同的反应温度下获得具有不同Pb/Br比（CsBr、Cs 4 PbBr 6和CsPbBr 3 ）的纯纳米结构，从而控制Pb-Br键和互连[PbBr 6 ] 4−八面体，并导致形成不同的纳米结构。随着反应温度从120℃升高到180℃，产物从无铅CsBr纳米晶转变为贫铅Cs 4 PbBr 6纳米晶，最后转变为普通的CsPbBr 3纳米立方体和纳米线。此外，合成的CsPbBr 3纳米线在521 nm处具有发射峰，半峰全宽（FWHM）为19 nm，光致发光量子产率（PLQY）为64.9%，稳定性高。此外，基于获得的 CsPbBr 3成功制造了白光发光二极管 (WLED) 器件纳米线，显示高强度白光和高稳定性，无需任何封装。值得注意的是，这项工作为阐明钙钛矿纳米材料的合成机理及其应用提供了一种新方法。
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