[Spectral studies of nanosized LnVO4:Eu (Ln = La, Gd, Y)].
Nanosized LnVO4:Eu (Ln = La, Gd, Y) with diameters ranging from 20 to 50 nm were synthesized by complex sol-gel technique. The structures and spectral properties of LnVO4:Eu were studied by X-ray powder diffraction (XRD), Fourier transform (FT-IR) spectroscopy, luminescence spectra and ultraviolet spectroscopy (UV). The experimental results show that YVO4:Eu and GdVO4:Eu have similar spectral properties because they both have the structure of xenotime, while the structure of LaVO4:Eu belongs to monazite, whose symmetry is inferior to the former vanadates. Consequently the spectral properties of LaVO4:Eu are obviously different from the other two luminescence materials, as the peaks of infrared spectrum and emission spectrum become wider and the number of peaks in UV-Vis spectrum increases.
Zhang
Hong-wu
HW
Dalian Institute of Chemical Physics, DMFC, Chinese Academy of Science, Dalian 116023, China.
Fu
Xiao-yan
XY
Niu
Shu-yun
SY
Han
Yan
Y
Sun
Gong-quan
GQ
Xin
Qin
Q