Journal
CRYSTENGCOMM
Volume 13, Issue 2, Pages 474-482Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0ce00161a
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Funding
- National Basic Research Program of China [2007CB935502, 2010CB327704]
- National Natural Science Foundation of China (NSFC) [60977013, 50872131, 20901074, 20921002]
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Lanthanide orthovanadate LnVO(4) (Ln = La to Lu) nano-/microcrystals with multiform crystal structures (monoclinic and tetragonal) and morphologies (separated nanoparticles, micropancake, microdoughnut and spherical aggregates) were successfully synthesized by a facile, effective, and environmentally friendly hydrothermal method. X-Ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, photoluminescence spectra, low-voltage cathodoluminescence, and kinetic decays were used to characterize the samples. The experimental results indicated that the use of the organic additive trisodium citrate (Cit(3-)) has an obvious impact on the morphologies of the products. The possible formation mechanisms for LnVO(4) nano-/microcrystals with diverse well-defined morphologies have been presented in detail. Additionally, we systematically investigate the luminescent properties of the LuVO4:Ln(3+) (Ln = Eu, Sm and Dy). Due to an efficient energy transfer from vanadate groups to the dopants, LuVO4:Ln(3+) (Ln = Eu, Sm and Dy) phosphors showed the strong characteristic emission of Ln3+ under ultraviolet excitation and low-voltage electron beam excitation. Furthermore, the PL emission color of LuVO4:Ln(3+) (Ln = Eu, Sm and Dy) phosphors can be tuned from blue to red, orange-red, and green easily by partial replacement VO43- with PO43- and changing the doping concentrations (x) of Ln(3+.)
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