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NaYF4:Yb,Er nanocrystals with different structures and sizes have been synthesized via a hydrothermal method. Structures and sizes of the NaYF4:Yb,Er nanocrystals are carefully investigated by changing the Gd3+ ion concentrations and reaction temperatures. It is found that the change of Gd3+ doping concentration and reaction temperature not only induces the phase transition but also causes the size...
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