Laboratoire Réactions et Génie des Procédés (LRGP), UPR 3349, Nancy-University, CNRS, 1 rue Grandville, 54001 Nancy Cedex, France.
Inorg Chem. 2010 Dec 6;49(23):10940-8. doi: 10.1021/ic101302q. Epub 2010 Nov 4.
Relatively monodisperse and highly luminescent Mn(2+)-doped zinc blende ZnSe nanocrystals were synthesized in aqueous solution at 100 °C using the nucleation-doping strategy. The effects of the experimental conditions and of the ligand on the synthesis of nanocrystals were investigated systematically. It was found that there were significant effects of molar ratio of precursors and heating time on the optical properties of ZnSe:Mn nanocrystals. Using 3-mercaptopropionic acid as capping ligand afforded 3.1 nm wide ZnSe:Mn quantum dots (QDs) with very low surface defect density and which exhibited the Mn(2+)-related orange luminescence. The post-preparative introduction of a ZnS shell at the surface of the Mn(2+)-doped ZnSe QDs improved their photoluminescence properties, resulting in stronger emission. A 2.5-fold increase in photoluminescence quantum yield (from 3.5 to 9%) and of Mn(2+) ion emission lifetime (from 0.62 to 1.39 ms) have been observed after surface passivation. The size and the structure of these QDs were also corroborated by using transmission electron microscopy, energy dispersive spectroscopy, and X-ray powder diffraction.
采用成核掺杂策略，在 100°C 的水溶液中合成了具有相对单分散性和高光致发光性的 Mn(2+)掺杂闪锌矿 ZnSe 纳米晶体。系统研究了实验条件和配体对纳米晶体合成的影响。研究发现，前驱体的摩尔比和加热时间对 ZnSe:Mn 纳米晶体的光学性质有显著影响。使用 3-巯基丙酸作为封端配体，得到了具有非常低的表面缺陷密度的 3.1nm 宽的 ZnSe:Mn 量子点（QDs），并表现出 Mn(2+)相关的橙色发光。在 Mn(2+)掺杂的 ZnSe QDs 表面进行后制备的 ZnS 壳层的引入改善了它们的光致发光性能，从而导致更强的发射。表面钝化后，光致发光量子产率（从 3.5%增加到 9%）和 Mn(2+)离子发射寿命（从 0.62ms 增加到 1.39ms）增加了 2.5 倍。还通过使用透射电子显微镜、能量色散光谱和 X 射线粉末衍射来证实这些 QDs 的尺寸和结构。
