Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai, China.
Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai, China.
J Colloid Interface Sci. 2018 Nov 1;529:575-581. doi: 10.1016/j.jcis.2018.06.053. Epub 2018 Jun 21.
The solvent-induced precipitation in a mixture of good and poor solvents was often used to synthesize organometal halide perovskite nanocrystals (OMHP NCs). Here we investigate the formation of OMHP NCs by using HBr based precursors in various solvents. Various emission colors and morphologies of perovskite NCs were obtained depending on the solvents used. The nanoplatelets with blue emission were produced for the low polar solvents, such as toluene, PhCl and EtOAc. The increase in polarity of poor solvents results in the red shift of emission of obtained NCs. The much more polar solvents like acetone and CHCN lead to formation of CHNHPbBr NCs (MaPbBr) with cubic phase. The dispersion behaviors of MaPbBr NCs in different solvents was also investigated. MaPbBr NCs can exist stably in most unpolar solvents. However, they will be dissolved in polar solvents, like acetone and acetonitrile, to give rise to a clear solution with red emission of Pb. By injecting this clear solution to unpolar solvents, OMHP NCs can be reproduced.
在良溶剂和不良溶剂的混合溶剂中，会发生溶剂诱导沉淀，通常用于合成有机金属卤化物钙钛矿纳米晶体（OMHP NCs）。在这里，我们研究了使用基于 HBr 的前体在各种溶剂中合成 OMHP NCs 的过程。根据所使用的溶剂，获得了具有各种发射颜色和形态的钙钛矿 NCs。对于低极性溶剂，如甲苯、PhCl 和 EtOAc，会生成具有蓝色发射的纳米板。不良溶剂的极性增加会导致所得 NCs 的发射红移。极性更大的溶剂，如丙酮和 CHCN，会导致形成具有立方相的 CHNHPbBr NCs（MaPbBr）。我们还研究了 MaPbBr NCs 在不同溶剂中的分散行为。MaPbBr NCs 在大多数非极性溶剂中可以稳定存在。然而，它们会溶解在极性溶剂中，如丙酮和乙腈，产生具有红色 Pb 发射的澄清溶液。通过将这种澄清溶液注入非极性溶剂中，可以重新获得 OMHP NCs。
