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Excitation wavelength and intensity dependence of photo-spectral blue shift in single CdSe/ZnS quantum dots

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Abstract

The influence of excitation wavelength and intensity on core/shell CdSe/ZnS quantum dots (QDs) photo-spectral blue shift was investigated by spectral imaging. Analysis of the evolution of the distance between the zeroth-order spot and the first-order spectral streak, we found that the extent of blue shift strongly depends on the excitation wavelength and QDs sizes, but not on the excitation intensity. Converted the extent of blue shift into the decreased QDs volume at a series of time, the core oxidation kinetics of CdSe/ZnS QDs was uncovered that provided a quantitative comparison method for study the excitation wavelength and intensity dependence of single QDs blue shift. The core oxidation rate is almost proportional to the excitation intensity. These results are explained by a fact that higher energy excitation wavelength can accelerate individual exciton formation and higher excitation intensity can induce more amount of exciton formation per a unit time.

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Acknowledgments

The authors are grateful to the Natural Science Foundation of China (NSFC, 31301484), and Youth Foundation of Hunan Agricultural university (12YJ09).

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Authors and Affiliations

  1. Hunan Provincial Key Laboratory of Food Science and Biotechnology, College of Food Science and Technology, Hunan Agricultural University, Changsha, 410128, Hunan, People’s Republic of China

    Xingbo Shi, Shu Zheng, Wenli Gao, Wei Wei, Meiling Chen, Fangming Deng, Xia Liu & Qian Xiao

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  1. Xingbo Shi
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Correspondence to Xingbo Shi.

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Shi, X., Zheng, S., Gao, W. et al. Excitation wavelength and intensity dependence of photo-spectral blue shift in single CdSe/ZnS quantum dots. J Nanopart Res 16, 2741 (2014). https://doi.org/10.1007/s11051-014-2741-3

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