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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 4 — Feb. 15, 2010
  • pp: 3364–3369

Controllable energy transfer in fluorescence upconversion of NdF3 and NaNdF4 nanocrystals

M. Li, Z.-H. Hao, X.-N. Peng, J.-B. Li, X.-F. Yu, and Q.-Q. Wang  »View Author Affiliations


Optics Express, Vol. 18, Issue 4, pp. 3364-3369 (2010)
http://dx.doi.org/10.1364/OE.18.003364


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Abstract

The synthesized Nd fluoride nanocrystals exhibited different upconversion behaviors as dispersed and aggregated samples due to the different energy transfer mechanisms. When they were dispersed in water, the NaNdF4 nanocrystals exhibited ~400 times stronger upconversion fluorescence than the NdF3 nanocrystals. Remarkable upconversion behaviors were found when the nanocrystals were aggregated in the films. For the NdF3 nanocrystals, the energy transfer processes 4I13/24F3/24G7/2 in the films generated avalanche upconversion emissions with a high slope of ~12.0, which could be due to the large avalanche cross relaxation rates and spectral broadening effect. In contrast, the spectral broadening effect in the NaNdF4 NCs films increased the energy transfer 4I15/24F3/24G5/2 of the Nd3+ ions, and induced a new upconversion emission at ~680 nm with the slope increased from 1.0 to 3.2.

© 2010 OSA

OCIS Codes
(190.7220) Nonlinear optics : Upconversion
(300.2530) Spectroscopy : Fluorescence, laser-induced
(160.4236) Materials : Nanomaterials

ToC Category:
Nonlinear Optics

History
Original Manuscript: November 23, 2009
Revised Manuscript: December 26, 2009
Manuscript Accepted: January 20, 2010
Published: February 2, 2010

Citation
M. Li, Z.-H. Hao, X.-N. Peng, J.-B. Li, X.-F. Yu, and Q.-Q. Wang, "Controllable energy transfer in fluorescence upconversion of NdF3 and NaNdF4 nanocrystals," Opt. Express 18, 3364-3369 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-4-3364


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