Abstract
Tm3+ doped β-NaYbF4 with different aspect ratios has been synthesized by a facile hydrothermal method. A different morphology and size of β-NaYbF4 microrods were obtained by changing the NaF/RE (RE=Yb,Tm, 99.5% Yb3+, 0.5% Tm3+) molar ratio. The morphology and size of products were explored by SEM, and the influences of the NaF/RE molar ratio on the microrod size were evidenced by XRD. It is shown that the size and morphology of the products can be precisely controlled by modulation of the NaF/RE molar ratio. β-NaYbF4 microrods with 35μm in length and 7.5μm in diameter were prepared when NaF/RE molar ratio is 6. Intense ultraviolet emissions at 290nm, 345, and 361nm and visible emissions at 451 and 494nm were observed in Tm3+ doped NaYbF4 microrods with an excitation of a 980nm diode laser. The effect of NaF/RE ratio on growth rate has been proposed.
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