Welyab Getachew, Abebe Mulualem, Mani Dhakshnamoorthy, Thankappan Aparna, Thomas Sabu, Aga Fekadu Gochole, Kim Jung Yong
Faculty of Materials Science and Engineering, Jimma Institute of Technology, Jimma University, Jimma P.O. Box 378, Ethiopia.
Department of Physics, College of Natural and Computational Science, Mizan-Tepi University, Mizan P.O. Box 260, Ethiopia.
Micromachines (Basel). 2023 Jun 29;14(7):1332. doi: 10.3390/mi14071332.
Room temperature (RT) synthesis of the ternary cesium lead bromide CsPbBr quantum dots with oleic acid and oleylamine ligands was developed by Zeng and coworkers in 2016. In their works, the supersaturated recrystallization (SR) was adopted as a processing method without requiring inert gas and high-temperature injection. However, the oleic acid ligand for haloplumbate is known to be relatively unstable. Hence, in this work, we employed the eco-friendly olive oil to replace the oleic acid portion for the SR process at RT. Resultantly, we found that the cube-shaped nanocrystal has a size of ~40-42 nm and an optical bandgap of ~2.3 eV independent of the surface ligands, but the photoluminescence lifetime (τ) and crystal packing are dependent on the ligand species, e.g., τ = 3.228 ns (olive oil and oleylamine; here less ordered) vs. 1.167 ns (oleic acid and oleylamine). Importantly, we explain the SR mechanism from the viewpoint of the classical LaMer model combined with the solvent engineering technique in details.
2016年，曾及其同事开发了在室温（RT）下用油酸和油胺配体合成三元溴化铯铅（CsPbBr）量子点的方法。在他们的工作中，采用了过饱和重结晶（SR）作为一种处理方法，无需惰性气体和高温注入。然而，已知卤化铅酸盐的油酸配体相对不稳定。因此，在这项工作中，我们采用环保的橄榄油替代油酸部分用于室温下的SR过程。结果，我们发现立方体形纳米晶体的尺寸约为40-42nm，光学带隙约为2.3eV，与表面配体无关，但光致发光寿命（τ）和晶体堆积取决于配体种类，例如，τ = 3.228ns（橄榄油和油胺；此处有序性较低）与1.167ns（油酸和油胺）相比。重要的是，我们从经典的LaMer模型结合溶剂工程技术的角度详细解释了SR机制。
