卤化铅钙钛矿及其他金属卤化物配合物作为胶体纳米晶体的无机封端配体。
Lead halide perovskites and other metal halide complexes as inorganic capping ligands for colloidal nanocrystals.
作者信息
Dirin Dmitry N, Dreyfuss Sébastien, Bodnarchuk Maryna I, Nedelcu Georgian, Papagiorgis Paris, Itskos Grigorios, Kovalenko Maksym V
机构信息
Institute of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich , CH-8093 Zürich, Switzerland.
出版信息
J Am Chem Soc. 2014 May 7;136(18):6550-3. doi: 10.1021/ja5006288. Epub 2014 Apr 22.
Lead halide perovskites (CH3NH3PbX3, where X = I, Br) and other metal halide complexes (MX(n), where M = Pb, Cd, In, Zn, Fe, Bi, Sb) have been studied as inorganic capping ligands for colloidal nanocrystals. We present the methodology for the surface functionalization via ligand-exchange reactions and the effect on the optical properties of IV-VI, II-VI, and III-V semiconductor nanocrystals. In particular, we show that the Lewis acid-base properties of the solvents, in addition to the solvent dielectric constant, must be properly adjusted for successful ligand exchange and colloidal stability. High luminescence quantum efficiencies of 20-30% for near-infrared emitting CH3NH3PbI3-functionalized PbS nanocrystals and 50-65% for red-emitting CH3NH3CdBr3- and (NH4)2ZnCl4-capped CdSe/CdS nanocrystals point to highly efficient electronic passivation of the nanocrystal surface.
卤化铅钙钛矿（CH3NH3PbX3，其中X = I、Br）以及其他金属卤化物配合物（MX(n)，其中M = Pb、Cd、In、Zn、Fe、Bi、Sb）已被研究用作胶体纳米晶体的无机封端配体。我们介绍了通过配体交换反应进行表面功能化的方法以及对IV-VI、II-VI和III-V族半导体纳米晶体光学性质的影响。特别是，我们表明，除了溶剂介电常数外，溶剂的路易斯酸碱性质也必须进行适当调整，以实现成功的配体交换和胶体稳定性。对于近红外发射的CH3NH3PbI3功能化的PbS纳米晶体，发光量子效率高达20-30%；对于红色发射的CH3NH3CdBr3和(NH4)2ZnCl4封端的CdSe/CdS纳米晶体，发光量子效率为50-65%，这表明纳米晶体表面具有高效的电子钝化作用。
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