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NaY(WO 4 ) 2 :Yb 3+ /Er 3+  upconversion phosphors with different Yb 3+ /Er 3+  doping concentrations were synthesized by high temperature solid-state reaction at 1200 °C for 4 h. The phase structure, surface morphology and luminescent properties were characterized by X-ray diffraction, scanning electron microscope and fluorescence spectroscopy. The sample composed of 7% Yb 3+  and 2.5% Er 3+  has the best luminescent properties. At 980 nm excitation, the emission peak of all the samples locates at the green area. The energy transfer of Yb 3+ →Er 3+  is dominant in the energy transfer. The results demonstrate NaY(WO 4 ) 2 :Yb 3+ /Er 3+  can be used as the feasible materials for biomarkers and upconversion white light-emitting diodes.

Structure, morphology and upconversion luminescence properties of Yb 3+ /Er 3+ Co-doped NaY(WO 4 ) 2 phosphors