Mechanochemical preparation of nanocrystalline NaYF4:Gd3+/Yb3+/Tm3+: An efficient upconversion phosphor

Jun Zhang, Hans Riesen

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14 Citations (Scopus)


We report on a mechanochemical preparation route for NaYF 4:Gd 3+/Yb 3+/Tm 3+ nanoparticles by ball-milling NaF, YF 3, GdF 3, YbF 3 and TmF 3 at room temperature. An analysis by XRD and TEM demonstrates that the resulting materials are mainly (∼88% after 4 h ball-milling) in the hexagonal phase and are on the nanoscale with an average crystallite size of ∼20 nm. The prepared nanoparticles display efficient upconversion emission; upon excitation by a 980 nm laser diode, bright visible blue light emission can be observed. However, in accord with previous results, the strongest emission is observed in the NIR at 800 nm.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalChemical Physics Letters
Publication statusPublished - 16 Nov 2015
Externally publishedYes


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