Abstract
Large-scale well-aligned rod-like and flower-like YVO 4:Eu 3+ crystals were prepared on glass substrates by a hydrothermal method in a controllable way with additive ethylenediamine tetraacetic acid disodium salt [Na 2H 2L·2H 2O]. No extra surfactants or templates were used. In the synthesis process, well-aligned YVO 4:Eu 3+ microrods were fabricated on YVO 4:Eu 3+-seed-coated substrates. The YVO 4:Eu 3+ seed precursor was prepared by a sol–gel reaction. And well-defined flower-like YVO 4:Eu 3+ microstructures were fabricated on bare substrates. The products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and photoluminescence (PL). TEM and SEM studies reveal that the flower-like superstructure is composed of dozens of radially oriented rhombus-shaped microrods and the crystalline microrods with rectangle cross-sections and well-defined crystallographic faces are grown directly onto the substrates. This convenient method may be applicable to prepare other orthovanadate phosphors with 3D morphologies.
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