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A Solvothermal Route to Size- and Phase-Controlled Highly Luminescent NaYF4:Yb,Er Up-Conversion Nanocrystals

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Size-controlled hexagonal- and cubic-phase NaYF4:Yb,Er nanocrystals with bright fluorescent emission were successfully synthesized via a solvothermal approach at a relatively low temperature (<300 °C). A mixture of ethanol and ethylene glycol or pure ethylene glycol was used as a solvent, whereby changing the ethanol concentration. It is found that, besides reaction temperature and time, the reactant concentration is an important factor to control crystal phase. High reactant concentration, high reaction temperature, high concentration of ethanol and long reaction durations are favorable to the formation of brightly emitting hexagonal-phase nanocrystals. The effects of these reaction conditions on the size and the luminescent properties of the as-prepared nanocrystals are discussed. It is found that 30–120 nm hexagonal NaYF4:Yb,Er nanoparticles can be prepared using 0.04 M reactant concentration in 0–60% ethanol solution at 220 °C for 24 h.
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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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