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

• Authors: S. Zhang , Y. Liang , X. Gao , H. Liu
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

78.55.-m; 42.70.Hj; 78.67.-n

Discipline

• 42.70.Hj: Laser materials
• 78.55.-m: Photoluminescence, properties and materials(for time resolved luminescence, see 78.47.jd)
• 78.67.-n: Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures(for magnetic properties of nanostructures, see 75.75.-c; for electronic transport in nanoscale structures, see 73.63.-b; for mechanical properties of nanoscale systems, see 62.25.-g)

• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 1
• Pages: 105-110

Dates

published

2014-01

received

2013-06-13

(unknown)

2013-11-20

Contributors

author

S. Zhang

• Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Engineering, Zhengzhou University, 450052 Zhengzhou, China

author

Y. Liang

• College of Information Science and Engineering, Henan University of Technology, 450001 Zhengzhou, China

author

X. Gao

• Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Engineering, Zhengzhou University, 450052 Zhengzhou, China

author

H. Liu

• Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Engineering, Zhengzhou University, 450052 Zhengzhou, China

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Identifiers

DOI

10.12693/APhysPolA.125.105