Tetragonal $$\text {NaY}(\text {MoO}_{4})_{2}$$ (NYM) phosphors co-doped with $$\hbox {Yb}^{3+}$$ and $$\hbox {Tm}^{3+}$$ ions were synthesized through microwave hydrothermal method followed by calcining treatment. Powder X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and photoluminescence spectra were used to characterize the properties of as-prepared samples. The results show that $$\hbox {Yb}^{3+}$$ / $$\hbox {Tm}^{3+}$$ co-doped NYM displayed bright blue emission near 472 and 476 nm ( $$^{1}\hbox {G}_{4}\rightarrow {}^{3}\hbox {H}_{6}$$ transition), strong near-infrared upconversion (UC) emission around 795 nm ( $$^{3}\hbox {H}_{4}\rightarrow {}^{3}\hbox {H}_{6}$$ transition). The optimum doping concentrations of $$\hbox {Yb}^{3+}$$ and $$\hbox {Tm}^{3+}$$ for the most intense UC luminescence were obtained, and the related UC mechanism of $$\hbox {Yb}^{3+}$$ / $$\hbox {Tm}^{3+}$$ co-doped NYM depending on pump power was studied in detail. [ABSTRACT FROM AUTHOR]
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