Abstract
Hexagonal NaYF4:Yb3+/Er3+ nanowire arrays were successfully synthesized via a hydrothermal method assisted by AAO template. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED) have been used to study the morphologies and crystal structures of the products. The formation of NaYF4:Yb3+/Er3+ nanowire arrays was investigated in detail, and one possible mechanism was proposed. The hexagonal NaYF4:Yb3+/Er3+ nanowire arrays show characteristic upconversion fluorescence at green(520–570nm) and red (630–680nm) corresponding to the 4f–4f transition of Er3+. Compared with the hexagonal NaYF4:Yb3+/Er3+ microprisms, the intensity of the red light is obviously improved due to size-dependent nonradiative relaxation.
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