title: Absolute quantum yield measurements of colloidal NaYF4: Er3+, Yb3+ upconverting nanoparticles.
abstract: In this communication we describe a technique for measuring the absolute quantum yields (QYs) of upconverting nanomaterials based on the use of a commercially available fluorimeter and an integrating sphere. Using this setup, we have successfully acquired luminescence efficiency data (pump laser, absorbed pump, and visible emitted intensities) for lanthanide-doped upconverting nanoparticles. QYs in the range of 0.005% to 0.3% were measured for several NaYF(4): 2% Er(3+), 20% Yb(3+) nanoparticles with particle sizes ranging from 10 to 100 nm while a QY of 3% was measured for a bulk sample.
authors.affiliation: University of Victoria, Department of Chemistry, P.O. Box 3065, Victoria, British Columbia, Canada.
authors.forename: John-Christopher
authors.initials: JC
authors.lastname: Boyer
authors.forename: Frank C J M
authors.initials: FC
authors.lastname: van Veggel
mesh_terms: D004871:Erbium / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D005470:Fluorometry; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011789:Quantum Theory; D015018:Ytterbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*
chemical_list: C525362:sodium yttriumtetrafluoride; D015019:Yttrium; D004871:Erbium; D015018:Ytterbium; D005459:Fluorides