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Optics Letters

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  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 9 — May. 1, 2007
  • pp: 1174–1176

Upconversion luminescence of CdTe nanocrystals by use of near-infrared femtosecond laser excitation

W. Z. Wu, Z. R. Zheng, W. L. Liu, J. P. Zhang, Y. X. Yan, Q. H. Jin, Y. Q. Yang, and W. H. Su  »View Author Affiliations


Optics Letters, Vol. 32, Issue 9, pp. 1174-1176 (2007)
http://dx.doi.org/10.1364/OL.32.001174


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Abstract

We study the steady-state and time-resolved luminescent properties of CdTe nanocrystals by one- and two-photon excitation with a femtosecond laser. We observe that 1208 nm excitation causes a shift of the emission peak of about 20 nm to the infrared compared with 400 nm laser excitation. It is found that upconversion luminescence is composed of a photoinduced trapping and a band edge excitonic state and produces the observation of biexponential decay kinetics. We conclude that the redshift of the emission peak is caused by the relative change in luminescence intensity between excitonic and trapping states.

© 2007 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(260.2510) Physical optics : Fluorescence
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(300.6500) Spectroscopy : Spectroscopy, time-resolved

ToC Category:
Spectroscopy

History
Revised Manuscript: January 7, 2007
Manuscript Accepted: December 18, 2006
Published: April 3, 2007

Citation
W. Z. Wu, Z. R. Zheng, W. L. Liu, J. P. Zhang, Y. X. Yan, Q. H. Jin, Y. Q. Yang, and W. H. Su, "Upconversion luminescence of CdTe nanocrystals by use of near-infrared femtosecond laser excitation," Opt. Lett. 32, 1174-1176 (2007)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-9-1174


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