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Hydrothermal Synthesis and Microstructural, Optical Properties Characterization of YVO_4 Phosphor Powder

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Zhang S., Liang Y., Gao X., Liu H.

Acta Physica Polonica A

2014

vol. 125

issue 1

105-110

The phonon energy of YVO_4 crystal is lower than other usual compounds of salt. So it is suitable as host material for down-conversion materials. Hydrothermal method was adopted to synthesize YVO_4 phosphor powder with the use of yttrium oxide and sodium vanadate as raw material. The change in the relative integral intensity of the (200) and (112) diffraction peaks indicates that macroscopic stress in the lattice obviously changes with the elevated hydrothermal reaction temperature. The YVO_4 phosphor powder synthesized involves a certain agglomeration of small particles. The phonon vibration in the YVO_4 originates mainly from the internal vibrations in the vanadium-oxygen tetrahedron, in addition to the Y-O and O-H vibrations. Due to a low phonon energy of only 2.8188 × 10^{-21} J, YVO_4 helps to improve the down-conversion efficiency of rare-earth ions. A bandgap value of approximately 3.8 eV for the synthesized YVO_4 powders leads to good absorption properties in the ultraviolet region. Upon excitation by the 320 nm ultraviolet photon, the intrinsic emission of YVO_4 powders is annihilated, and a broadband emission of VO_4^{3-} near 450 nm is observed at room temperature. The YVO_4 phosphor powder synthesized at 180C exhibits the maximum photoluminescence intensity because of its excellent crystallization.

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1 Acta Physica Polonica A

1 2014

1 Gao X.

1 Liang Y.

1 Liu H.

1 Zhang S.

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Hydrothermal Synthesis and Microstructural, Optical Properties Characterization of YVO_4 Phosphor Powder