α-Halo Ketone for Polyhedral Perovskite Nanocrystals: Evolutions, Shape Conversions, Ligand Chemistry, and Self-Assembly,Journal of the American Chemical Society

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α-Halo Ketone for Polyhedral Perovskite Nanocrystals: Evolutions, Shape Conversions, Ligand Chemistry, and Self-Assembly
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-11-25 , DOI: 10.1021/jacs.0c10688
Suman Bera ₁ , Rakesh Kumar Behera ₁ , Narayan Pradhan ₁

Affiliation

Bright lead halide perovskite nanocrystals, which have been extensively studied in the past 5 years, are mostly confined to a six faceted hexahedron (cube/platelet) shape. With variations of ligand, precursor, reaction temperature, and surface modification, their brightness has been enhanced and phase became stable, but ultimate nanocrystals still retained the hexahedron cube or platelet shape in most of the hot injection reactions. In contrast, by exploration of α-halo ketone in amine as a halide precursor, different shaped nanocrystals without compromising the photoluminescence quantum yield (PLQY) are reported. Confining to orthorhombic CsPbBr3, the obtained nanocrystals are stabilized by 12 facets ({200}, {020}, {112}) and led to 12 faceted rhombic dodecahedrons. These facets are absolutely different from six ({110}, {002}) equivalent facets of widely reported orthorhombic cube shaped CsPbBr3 nanocrystals. These also retained the colloidal and phase stability, as well as showed near unity PLQY. With further annealing, these are transformed to 26 faceted rhombicuboctahedrons by dissolving all their vertices. Importantly, these 12 faceted nanocrystals showed wide area self-assembly in most of the reactions. It has also been concluded that primary ammonium ions led to six faceted nanocrystals, but tertiary ammonium ions obtained in this case stabilized different group of facets. While perovskite nanocrystals were broadly confined to only nanocubes, these new nanocrystals with intense emission would certainly provide a new avenue for continuing their further research.

中文翻译：

用于多面体钙钛矿纳米晶体的 α-卤代酮：进化、形状转换、配体化学和自组装

明亮的卤化铅钙钛矿纳米晶体在过去 5 年中得到了广泛的研究，但大多局限于六面体（立方体/片状）形状。随着配体、前体、反应温度和表面改性的变化，它们的亮度得到增强，相变得稳定，但最终的纳米晶体在大多数热注射反应中仍保持六面体立方体或片晶形状。相比之下，通过探索胺中的 α-卤代酮作为卤化物前体，报道了不同形状的纳米晶体，而不会影响光致发光量子产率 (PLQY)。限于正交CsPbBr3，获得的纳米晶体由12个面（{200}、{020}、{112}）稳定并形成12个面菱形十二面体。这些方面完全不同于六个 ({110}, {002}) 广泛报道的正交立方体形 CsPbBr3 纳米晶体的等效面。这些还保留了胶体和相稳定性，并显示出接近统一的 PLQY。通过进一步退火，这些通过溶解所有顶点被转化为 26 个多面菱形八面体。重要的是，这 12 个多面纳米晶体在大多数反应中显示出大面积自组装。还得出结论，伯铵离子导致六面纳米晶体，但在这种情况下获得的叔铵离子稳定了不同的面群。虽然钙钛矿纳米晶体广泛地仅限于纳米立方体，但这些具有强烈发射的新纳米晶体肯定会为他们的进一步研究提供新的途径。这些还保留了胶体和相稳定性，并显示出接近统一的 PLQY。通过进一步退火，这些通过溶解所有顶点被转化为 26 个多面菱形八面体。重要的是，这 12 个多面纳米晶体在大多数反应中显示出大面积自组装。还得出结论，伯铵离子导致六面纳米晶体，但在这种情况下获得的叔铵离子稳定了不同的面群。虽然钙钛矿纳米晶体广泛地仅限于纳米立方体，但这些具有强烈发射的新纳米晶体肯定会为他们的进一步研究提供新的途径。这些还保留了胶体和相稳定性，并显示出接近统一的 PLQY。通过进一步退火，这些通过溶解所有顶点被转化为 26 个多面菱形八面体。重要的是，这 12 个多面纳米晶体在大多数反应中显示出大面积自组装。还得出结论，伯铵离子导致六面纳米晶体，但在这种情况下获得的叔铵离子稳定了不同的面群。虽然钙钛矿纳米晶体广泛地仅限于纳米立方体，但这些具有强烈发射的新纳米晶体肯定会为他们的进一步研究提供新的途径。这 12 个多面纳米晶体在大多数反应中显示出大面积自组装。还得出结论，伯铵离子导致六面纳米晶体，但在这种情况下获得的叔铵离子稳定了不同的面群。虽然钙钛矿纳米晶体广泛地仅限于纳米立方体，但这些具有强烈发射的新纳米晶体肯定会为他们的进一步研究提供新的途径。这 12 个多面纳米晶体在大多数反应中显示出大面积自组装。还得出结论，伯铵离子导致六面纳米晶体，但在这种情况下获得的叔铵离子稳定了不同的面群。虽然钙钛矿纳米晶体广泛地仅限于纳米立方体，但这些具有强烈发射的新纳米晶体肯定会为他们的进一步研究提供新的途径。

更新日期：2020-11-25

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