| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5368087 | Applied Surface Science | 2011 | 4 Pages |
Well oil-dispersible SrF2:Yb3+/Er3+ upconversion (UC) nanocrystals (NCs) were easily synthesized in the water-ethanol-oleic acid-sodium oleate complex systems. The as-prepared NCs all show size-uniformity, and their sizes, morphologies can be controlled by varying the solvent and reaction time, and rectangular SrF2:Yb3+/Er3+ nanosheets with the sizes of 5-25Â nm can be obtained. The possible mechanism on the nucleation and growth of nanocrystals occurred at the oleic acid/sodium oleate interface was also discussed. The size and morphology dependent UC luminescence behaviors have been observed in SrF2:Yb3+/Er3+ NCs, and their UC luminescence transitions were proposed. The as-prepared UC nanocrystals are expected to fulfill the demand for biological applications.
Research highlightsⶠIn this paper, to our knowledge, it is first time that well oil-dispersible SrF2:Yb3+/Er3+ nanocrystals have been successfully prepared in the water-ethanol-oleic acid-sodium oleate complex systems. ⶠThe size and shape of the NCs were controlled by adjusting the amount of OA/NaOA, temperature and reaction time. ⶠA systematic study on the photoluminescence of Yb3+/Er3+-doped SrF2 samples with different size and shapes has shown that the optical properties of products are strongly dependent on their size.
