Ligand-mediated synthesis of chemically tailored two-dimensional all-inorganic perovskite nanoplatelets under ambient conditions
Ligand-mediated synthesis of chemically tailored two-dimensional all-inorganic perovskite nanoplatelets under ambient conditions
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DOI：
10.1039/d1tc02931b
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发表时间：
2021-09-17
影响因子：
6.4
通讯作者：
Zheng, Weiwei
中科院分区：
文献类型：
--
作者：
Davis, Andrew H.;Li, Shuya;Zheng, Weiwei
全无机卤化物钙钛矿纳米晶体 (NC) 为光捕获、能量转换和光氧化还原应用提供了令人印象深刻的光电特性，而二维 (2D) 钙钛矿纳米晶体由于其改进的光致发光 (PL) 可调谐性、令人印象深刻的色纯度、高面内电荷传输和有利于器件集成的大横向尺寸，进一步增加了这些前景。然而，二维钙钛矿的合成仍然具有挑战性，特别是对于大规模应用。在这项研究中，通过控制短配体（辛酸和辛胺，8碳链）和长配体（油酸和油胺，18碳链）混合物的表面配体组成和浓度，我们开发了一种在室温下在开放容器中极其简便的配体介导合成2D CsPbX3（X = Cl、Br或其混合物）纳米片（NPL）的方法。此外，所开发的方法具有高度通用性，可用于合成锰掺杂的CsPbX3 NPL，显示出随着Mn和Cl浓度的增加，总PL量子产率（QY）和600 nm左右的Mn掺杂剂发射系统性增加。该反应通过在环境条件下引入 CsX、PbX2 和 MnX2 前体在甲苯中发生，不需要刺激性酸，避免过多的铅浪费，热能输入很少，并且有可能扩展到工业应用。
All-inorganic halide perovskite nanocrystals (NCs) offer impressive optoelectronic properties for light harvesting, energy conversion, and photoredox applications, with two-dimensional (2D) perovskite NCs further increasing these prospects due to their improved photoluminescence (PL) tuneability, impressive color purity, high in-plane charge transport, and large lateral dimensions which is advantageous for device integration. However, the synthesis of 2D perovskites is still challenging, especially toward large-scale applications. In this study, through the control of surface ligand composition and concentration of a mixture of short (octanoic acid and octylamine, 8-carbon chain) and long (oleic acid and oleylamine, 18-carbon chain) ligands, we have developed an extremely facile ligand-mediated synthesis of 2D CsPbX3 (X = Cl, Br, or mixture thereof) nanoplatelets (NPLs) at room temperature in an open vessel. In addition, the developed method is highly versatile and can be applied to synthesize Mn-doped CsPbX3 NPLs, showing a systematic increase in the total PL quantum yield (QY) and the Mn-dopant emission around 600 nm with increasing Mn and Cl concentrations. The reaction occurs in toluene by the introduction of CsX, PbX2, and MnX2 precursors under ambient conditions, which requires no harsh acids, avoids excessive lead waste, little thermal energy input, and is potentially scalable toward industrial applications.