In:
Journal of Nanoscience and Nanotechnology, American Scientific Publishers, Vol. 8, No. 3 ( 2008-03-01), p. 1437-1442
Abstract:
Upconversion emission of different nanocrystalline YVO 4 :Er 3+ , Yb 3+ synthesized by a hydrothermal process at low temperature was studied under 980 nm excitation where green [( 2 H 11/2 , 4 S 3/2 ) → 4 I 15/2 ]
and red ( 4 F 9/2 → 4 I 15/2 ) emissions demonstrate sensitivity to the local environments of Er 3+ . Small particle size, high Yb 3+ concentration, or high temperature favors the emission of the 2 H 11/2 → 4 I 15/2 transition. Both XRD patterns and Raman spectra have confirmed that crystal lattice distortion of YVO 4 :Er 3+ , Yb 3+ nanocrystals is more serious when the nanoparticle size is decreasing or Yb 3+ concentration is increasing.
This distortion is thought to play a key role in the observed spectral properties, which might lead to a new route to improve the monochromatic upconversion emission efficiency in these nanocrystals.
Type of Medium:
Online Resource
ISSN:
1533-4880
DOI:
10.1166/jnn.2008.18210
Language:
English
Publisher:
American Scientific Publishers
Publication Date:
2008
SSG:
11
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