Exciton Fine Structure of CdSe/CdS Nanocrystals Determined by Polarization Microscopy at Room Temperature.
Exciton Fine Structure of CdSe/CdS Nanocrystals Determined by Polarization Microscopy at Room Temperature.
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DOI：
10.1021/acsnano.5b01354
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发表时间：
2015-07
期刊：
影响因子：
17.1
通讯作者：
S. Vezzoli;M. Manceau;G. Leménager;Q. Glorieux;E. Giacobino;L. Carbone;M. de Vittorio;A. Bramati
中科院分区：
文献类型：
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作者：
S. Vezzoli;M. Manceau;G. Leménager;Q. Glorieux;E. Giacobino;L. Carbone;M. de Vittorio;A. Bramati
我们提出了一种方法，可以确定的带边激子精细结构的CdSe/CdS点在棒样品的基础上在室温下的单粒子偏振测量。考虑到精细结构特性、各向异性壳层引起的介电效应和测量配置，我们对这种单粒子的测量发射偏振进行了建模。我们用这种方法来表征各种棒中点样品的带边激子精细结构分裂。我们发现，当直径的CdSe核心的增加，从一个球形的带边激子对称性的棒状带边激子对称性的过渡发生。这解释了与球形CdSe/CdS发射体相比，经常报道的这种颗粒的大发射偏振。
We present a method that allows determining the band-edge exciton fine structure of CdSe/CdS dot-in-rods samples based on single particle polarization measurements at room temperature. We model the measured emission polarization of such single particles considering the fine structure properties, the dielectric effect induced by the anisotropic shell, and the measurement configuration. We use this method to characterize the band-edge exciton fine structure splitting of various samples of dot-in-rods. We show that, when the diameter of the CdSe core increases, a transition from a spherical like band-edge exciton symmetry to a rod-like band edge exciton symmetry occurs. This explains the often reported large emission polarization of such particles compared to spherical CdSe/CdS emitters.