Vybornyi Oleh, Yakunin Sergii, Kovalenko Maksym V
ETH Zürich - Swiss Federal Institute of Technology Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland.
Nanoscale. 2016 Mar 28;8(12):6278-83. doi: 10.1039/c5nr06890h.
A novel synthesis of hybrid organic-inorganic lead halide perovskite nanocrystals (CH3NH3PbX3, X = Br or I) that does not involve the use of dimethylformamide or other polar solvents is presented. The reaction between methylamine and PbX2 salts is conducted in a high-boiling nonpolar solvent (1-octadecene) in the presence of oleylamine and oleic acid as coordinating ligands. The resulting nanocrystals are characterized by high photoluminescence quantum efficiencies of 15-50%, outstanding phase purity and tunable shapes (nanocubes, nanowires, and nanoplatelets). Nanoplatelets spontaneously assemble into micrometer-length wires by face-to-face stacking. In addition, we demonstrate amplified spontaneous emission from thin films of green-emitting CH3NH3PbBr3 nanowires with low pumping thresholds of 3 μJ cm(-2).
本文介绍了一种新型的有机-无机杂化卤化铅钙钛矿纳米晶体（CH3NH3PbX3，X = Br或I）的合成方法，该方法不使用二甲基甲酰胺或其他极性溶剂。甲胺与PbX2盐之间的反应在高沸点非极性溶剂（1-十八烯）中进行，同时存在油胺和油酸作为配位配体。所得纳米晶体的特征在于具有15-50%的高光致发光量子效率、出色的相纯度和可调节的形状（纳米立方体、纳米线和纳米片）。纳米片通过面对面堆叠自发组装成微米长的线。此外，我们展示了从绿色发光的CH3NH3PbBr3纳米线薄膜中实现的放大自发发射，其低泵浦阈值为3 μJ cm(-2)。
