Journal
OPTICS EXPRESS
Volume 26, Issue 14, Pages 18480-18491Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.018480
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Funding
- National Natural Science Fund of China [61275117, 11774141]
- Natural Scientific Foundation of Heilongjiang Province [QC2015068]
- Scientific Foundation of the Returned Overseas Scholars by Heilongjiang Province [LC2017030]
- Heilongjiang Postdoctoral Scientific Research Development Fund [LBH-Q15117]
- Heilongjiang Creative Talents Plan [UNPYSCT-2017117]
- Heilongjiang Basic Scientific Research Service Fund [HDRCCX-201603]
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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 x 10(6) 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. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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