Ultrafast optical properties of type-II CdZnS/ZnSe core-shell quantum dots

In this study, the ultrafast optical properties of type-II CdZnS/ZnSe core-shell quantum dots were investigated using the Z-scan and transient absorption technique with femtosecond pulses. With 800-nm wavelength excitation, the CdZnS/ZnSe quantum dots exhibited two-photon absorption, and the two-pho...

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Published in:Optics express 2018-07, Vol.26 (14), p.18480-18491
Main Authors: Ran, Lingling, Li, Haiyang, Wu, Wenzhi, Gao, Yachen, Chai, Zhijun, Xiao, Jin, Li, Qinghua, Kong, Degui
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container_title Optics express
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creator Ran, Lingling
Li, Haiyang
Wu, Wenzhi
Gao, Yachen
Chai, Zhijun
Xiao, Jin
Li, Qinghua
Kong, Degui
description In this study, the ultrafast optical properties of type-II CdZnS/ZnSe core-shell quantum dots were investigated using the Z-scan and transient absorption technique with femtosecond pulses. With 800-nm wavelength excitation, the CdZnS/ZnSe quantum dots exhibited two-photon absorption, and the two-photon absorption cross section was obtained as about 3.37 × 10 GM. In addition, the transfer time of electrons and the recombination lifetime of a single exciton were obtained. For the photoluminescence of the CdZnS/ZnSe quantum dots at temperatures from 80 to 280 K, the peak position redshifted by 60 meV, width broadened by 3 meV, and intensity decreased by a factor of four.
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