Quantum-confined emission and fluorescence blinking of individual exciton complexes in CdSe nanowires.
Quantum-confined emission and fluorescence blinking of individual exciton complexes in CdSe nanowires.
复制标题
DOI：
10.1021/nl503331t
复制
发表时间：
2014-11
期刊：
影响因子：
10.8
通讯作者：
D. Franz;Aina Reich;C. Strelow;Zhe Wang;A. Kornowski;T. Kipp;A. Mews
中科院分区：
文献类型：
--
作者：
D. Franz;Aina Reich;C. Strelow;Zhe Wang;A. Kornowski;T. Kipp;A. Mews
一维半导体纳米结构联合收割机结合电子迁移率在长度方向上的可能性，定制的物理性能，通过限制效应在径向方向上。在这里，我们表明，薄的CdSe量子纳米线表现出低温荧光光谱与几个尖锐的线的特定的通用结构。该结构非常类似于体光谱的图案，但由于限制效应而显示出直径依赖的移位。此外，荧光显示出明显的复杂闪烁行为，在同一光谱中不同发射线具有非常不同的闪烁动力学。时间和空间分辨的光学光谱与高分辨率透射电子显微镜相结合的非常相同的量子纳米线，建立一个详细的结构-性能关系。广泛的数值模拟强烈表明，激子复合物涉及供体和受体网站的起源的功能丰富的光谱。
One-dimensional semiconductor nanostructures combine electron mobility in length direction with the possibility of tailoring the physical properties by confinement effects in radial direction. Here we show that thin CdSe quantum nanowires exhibit low-temperature fluorescence spectra with a specific universal structure of several sharp lines. The structure strongly resembles the pattern of bulk spectra but show a diameter-dependent shift due to confinement effects. Also the fluorescence shows a pronounced complex blinking behavior with very different blinking dynamics of different emission lines in one and the same spectrum. Time- and space-resolved optical spectroscopy are combined with high-resolution transmission electron microscopy of the very same quantum nanowires to establish a detailed structure-property relationship. Extensive numerical simulations strongly suggest that excitonic complexes involving donor and acceptor sites are the origin of the feature-rich spectra.