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首页> 美国卫生研究院文献>ACS AuthorChoice >Dismantlingthe Red Wall of ColloidalPerovskites: Highly Luminescent Formamidinium and Formamidinium–CesiumLead Iodide Nanocrystals
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Dismantlingthe Red Wall of ColloidalPerovskites: Highly Luminescent Formamidinium and Formamidinium–CesiumLead Iodide Nanocrystals

机译：拆解胶体的红墙钙钛矿：高度发光的甲ami和甲ami铯碘化铅纳米晶体

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Colloidal nanocrystals (NCs) of APbX3-type lead halide perovskites [A = Cs+, CH3NH3+ (methylammonium or MA+) or CH(NH2)2+ (formamidinium or FA+); X = Cl–, Br–, I–] have recently emerged as highly versatile photonic sources for applications ranging from simple photoluminescence down-conversion (e.g., for display backlighting) to light-emitting diodes. From the perspective of spectral coverage, a formidable challenge facing the use of these materials is how to obtain stable emissions in the red and infrared spectral regions covered by the iodide-based compositions. So far, red-emissive CsPbI3 NCs have been shown to suffer from a delayed phase transformation into a nonluminescent, wide-band-gap 1D polymorph, and MAPbI3 exhibits very limited chemical durability. In this work, we report a facile colloidal synthesis method for obtaining FAPbI3 and FA-doped CsPbI3 NCs that are uniform in size (10–15 nm) and nearly cubic in shape and exhibit drastically higher robustness than their MA- or Cs-only cousins with similar sizes and morphologies. Detailed structural analysis indicated that the FAPbI3 NCs had a cubic crystal structure,while the FA0.1Cs0.9PbI3 NCs hada 3D orthorhombic structure that was isostructural to the structureof CsPbBr3 NCs. Bright photoluminescence (PL) with highquantum yield (QY > 70%) spanning red (690 nm, FA0.1Cs0.9PbI3 NCs) and near-infrared (near-IR, ca. 780 nm, FAPbI3 NCs) regions was sustainedfor several months or more in both the colloidal state and in films.The peak PL wavelengths can be fine-tuned by using postsynthetic cation-and anion-exchange reactions. Amplified spontaneous emissions withlow thresholds of 28 and 7.5 μJ cm–2 wereobtained from the films deposited from FA0.1Cs0.9PbI3 and FAPbI3 NCs, respectively. Furthermore,light-emitting diodes with a high external quantum efficiency of 2.3%were obtained by using FAPbI3 NCs.
机译：APbX3型卤化铅钙钛矿的胶体纳米晶体[A = Cs + ，CH3NH3 + （甲基铵或MA + ）或CH（ NH2）2 + （甲酰胺或FA + ）； X = Cl – ，Br – ，I – ]最近成为高度通用的光子源，其应用范围包括简单的光致发光下转换（例如，用于显示器背光）。从光谱覆盖的角度来看，使用这些材料面临的巨大挑战是如何在基于碘化物的组合物覆盖的红色和红外光谱区域中获得稳定的发射。到目前为止，已经证明红色发射的CsPbI3 NC具有延迟相转变成不发光，宽带隙一维多晶型物的作用，而MAPbI3的化学耐久性非常有限。在这项工作中，我们报告了一种简便的胶体合成方法，用于获得FAPbI3和FA掺杂的CsPbI3 NC，它们的大小均一（10–15 nm），形状接近立方，并且比仅MA或Cs的表亲表现出更高的耐用性具有相似的大小和形态。详细的结构分析表明，FAPbI3 NC具有立方晶体结构，而FA0.1Cs0.9PbI3 NC具有与该结构同构的3D正交结构CsPbBr3 NC的数量。高亮度的光致发光（PL）跨越红色（690 nm，FA0.1Cs0.9PbI 3 NCs）和近红外（近红外，约780 nm，FAPbI 3 70％） sub> NCs）地区得以持续在胶体状态和薄膜中持续数月或更长时间。峰值PL波长可以使用合成后阳离子微调。和阴离子交换反应。自发辐射放大阈值分别为28和7.5μJcm –2 分别从FA 0.1 Cs 0.9 PbI 3 和FAPbI 3 NC沉积的薄膜中获得。此外，外部量子效率高达2.3％的发光二极管通过使用FAPbI 3 NC获得。

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