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Journal of Nanoparticle Research

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01.12.2014 | Research Paper

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

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

Erschienen in: Journal of Nanoparticle Research | Ausgabe 12/2014

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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.

Vorheriger Artikel Gold nanoparticle assemblies of controllable size obtained by hydroxylamine reduction at room temperature

Nächster Artikel Poly(lactic-co-glycolic) acid nanoparticles uptake by Vitis vinifera and grapevine-pathogenic fungi

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Titel: Excitation wavelength and intensity dependence of photo-spectral blue shift in single CdSe/ZnS quantum dots
verfasst von: Xingbo Shi
Shu Zheng
Wenli Gao
Wei Wei
Meiling Chen
Fangming Deng
Xia Liu
Qian Xiao
Publikationsdatum: 01.12.2014
Verlag: Springer Netherlands
Erschienen in: Journal of Nanoparticle Research / Ausgabe 12/2014
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-014-2741-3

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