Hydrothermal Synthesis and Microstructural, Optical Properties Characterization of YVO4 Phosphor Powder
S. Zhanga, Y. Liangb, X.-Y. Gaoa and H.-T. Liua
aKey Laboratory of Materials Physics of Ministry of Education, School of Physics and Engineering, Zhengzhou University, 450052 Zhengzhou, China
bCollege of Information Science and Engineering, Henan University of Technology, 450001 Zhengzhou, China
Received: June 13, 2013; In final form: November 20, 2013
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The phonon energy of YVO4 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 YVO4 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 YVO4 phosphor powder synthesized involves a certain agglomeration of small particles. The phonon vibration in the YVO4 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, YVO4 helps to improve the down-conversion efficiency of rare-earth ions. A bandgap value of approximately 3.8 eV for the synthesized YVO4 powders leads to good absorption properties in the ultraviolet region. Upon excitation by the 320 nm ultraviolet photon, the intrinsic emission of YVO4 powders is annihilated, and a broadband emission of VO43- near 450 nm is observed at room temperature. The YVO4 phosphor powder synthesized at 180°C exhibits the maximum photoluminescence intensity because of its excellent crystallization.

DOI: 10.12693/APhysPolA.125.105
PACS numbers: 78.55.-m, 42.70.Hj, 78.67.-n