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- W2892387859 abstract "Ultrasmall pure hexagonal phase NaYF4:Yb,Er is successfully prepared via the solvothermal method. The upconversion (UC) luminescence of hexagonal phase NaYF4:Yb,Er nanocrystals is ten times stronger than that of cubic phase nanocrystals with the same size of 6 nm. XRD results reveal that heating above 673 K leads to conversion of the hexagonal phase to the high-temperature cubic phase, whereas the cubic nanocrystals undergo phase transformation from normal cubic at room temperature to hexagonal at 673 K and further to high-temperature cubic above 773 K. The hexagonal nanocrystals exhibit emission enhancement after heat treatment up to 573 K. Further heating above 773 K induces a decreasing trend in emission due to the phase transition to the high-temperature cubic phase. The cubic phase exhibits decreasing luminescence with temperature due to strong cross relaxation and then increasing luminescence above the temperature of 673 K due to the hexagonal phase transformation. The luminescent properties of both the normal cubic phase and high-temperature cubic phase indicate that different crystal fields exist in these two phases due to the rearrangement of ligands around Er3+ at high temperature." @default.
- W2892387859 created "2018-10-05" @default.
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- W2892387859 date "2018-09-25" @default.
- W2892387859 modified "2023-10-16" @default.
- W2892387859 title "Na<sup>+</sup>-Driven Nucleation of NaYF<sub>4</sub>:Yb,Er Nanocrystals and Effect of Temperature on Their Structural Transformations and Luminescent Properties" @default.
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- W2892387859 doi "https://doi.org/10.1021/acs.jpcc.8b09327" @default.
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