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Bright Green Upconversion Fluorescence of Yb3+, Er3+-Codoped NaYF4 Nanocrystals

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Uniform hexagonal NaYF4: Yb3+, Er3+ nanocrystals (NCs) with bright green upconversion fluorescence were prepared. The nanocrystals were highly hydrophobic and dispersed in cyclohexane forming a transparent colloidal solution due to the use of oleic acid as a capping ligand. Temperature dependence for emission of Er3+ ions in this sample was also studied. The green emission intensity of Er3+ ions had a maximum at 160 K under 980 nm excitation, which was attributed to the thermally activated distribution of electrons and the thermal quenching effect. The transparent colloidal solution is expected to be a good candidate for research in biological imaging or display applications.
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Document Type: Research Article

Publication date: 2010-03-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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