Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 427, Issue 1-2, Pages 333-340Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2006.03.014
Keywords
nanostructured materials; chemical synthesis; luminescence
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Efficient near-infrared (NIR) upconversion Yb and Tm codoped NaYF4 nanocrystal reporter was prepared by synthesis at room temperature via wet-chemical route and then heat-treatment at elevated temperature. Several parameters such as pH value of solution, sequence of reactant addition, and annealing temperature, which have strong impacts on the structure and morphology of the nanoparticles, were investigated. Upconversion mechanism and factors that affect the fluorescent performance of the NaYF4:Yb, Tm nanoparticles were discussed. Besides the strong emission around 474 nm, a much more intense emission at about 800 nm was observed emitted by NaYF4:Yb, Tm nanoparticles under 980 nm IR excitation. This strong NIR emission is favorable for the highly sensitive label used in biological detection or in vivo NIR fluorescence imaging. (c) 2006 Elsevier B.V. All rights reserved.
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