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J Mater Chem. 2011;21(46):18530-18533. Epub 2011 Oct 26.

Control of Green and Red Upconversion in NaYF4:Yb3+,Er3+ Nanoparticles by Excitation Modulation.

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1
Department of Biomedical Engineering, The University of Arizona, P.O. Box 210240, Tucson, Arizona 85721, United States of America.

Abstract

Control of the two strongest upconversion emission lines in NaYF4:Yb3+, Er3+ nanoparticles is demonstrated by varying the excitation repetition rate. This technique may enable new multiplexed sensing modalities based on multicolor luminescent nanoparticles, currently contemplated for biomedical imaging and diagnostics.

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