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Journal of Nanoparticle Research

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01-03-2011 | Research Paper

Upconversion luminescent characteristics and peak shift of CdSeS nanocrystals under different wavelength laser excitation

Authors: Wenzhi Wu, Yachen Gao, Qing Chang, Hongan Ye, Zhiren Zheng, Weilong Liu, Aihua Li, Yanqiang Yang

Published in: Journal of Nanoparticle Research | Issue 3/2011

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Abstract

Upconversion luminescence was obtained from CdSeS nanocrystals (NCs) under 800 nm femtosecond laser excitation. The structural and optical characteristics of the CdSeS NCs were investigated experimentally by use of UV–visible absorption spectroscopy, transmission electron microscopy, X-ray diffractometry, and time-resolved luminescence dynamics. Peak shift of luminescence in CdSeS NCs can be readily observed under different wavelength femtosecond excitation. The pump power dependence of the luminescence intensity and time-resolved decay revealed that one, two, and three-photon absorption occur. It was found that upconversion luminescence is composed of photoinduced trapping and a band-edge excitonic state, and two types of species are involved in the biexponential luminescence decay kinetics. With increasing Se-doped composition, luminescence lifetimes of CdSeS NCs with similar sizes become shorter. This is not consistent with the changes of undoped CdS NCs and is ascribed to impurity level increased doping in the energy gap, which is favorable for trapping luminescence. A simple energy level of doping NCs is used to interpret upconversion luminescence and the peak shift of steady-state emission.

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Title: Upconversion luminescent characteristics and peak shift of CdSeS nanocrystals under different wavelength laser excitation
Authors: Wenzhi Wu
Yachen Gao
Qing Chang
Hongan Ye
Zhiren Zheng
Weilong Liu
Aihua Li
Yanqiang Yang
Publication date: 01-03-2011
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 3/2011
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-010-0094-0

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