title: Control of Green and Red Upconversion in NaYF4:Yb3+,Er3+Nanoparticles by Excitation Modulation.
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.
authors.affiliation: Department of Biomedical Engineering, The University of Arizona, P.O. Box 210240, Tucson, Arizona 85721, United States of America.
authors.forename: Christian F
authors.initials: CF
authors.lastname: Gainer
authors.forename: Gihan S
authors.initials: GS
authors.lastname: Joshua
authors.forename: Channa R
authors.initials: CR
authors.lastname: De Silva
authors.forename: Marek
authors.initials: M
authors.lastname: Romanowski