Synthesis and photoluminescent properties of nanoerythrocyte-shaped ytterbium orthovanadate and erbium ion-doped ytterbi
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Nanoerythrocyte-shaped ytterbium orthovanadate (YbVO4) with substantially uniform size have been successfully synthesized by a simple and facile trisodium citrate-assisted hydrothermal method. The erythrocyte-shaped YbVO4 nanocrystals with self-assembled spherical and biconcave structure have a diameter of ;500 nm, which were characterized by x-ray diffraction, x-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, high-resolution transmission electron microscopy and photoluminescence. The luminescent properties of erbium ion-doped ytterbium orthovanadate nanocrystals with different morphologies by different complexing agents were different in the relative intensity under identical measurement conditions, which exhibited the interesting morphology-dependent optical properties. The different energy transfer mechanisms and photoluminescence intensities might be the result of the greatly reduced defect centers.
I. INTRODUCTION
Morphology-selective synthesis of lanthanide orthovanadate nanomaterials is important due to their promising application in optical,1 electrical,2 magnetic3 and catalytic fields.4 Therefore, great effort has been devoted to the synthesis of lanthanide orthovanadates of various morphologies, including rods,5 wires,6 spheres,7 plates,8 cube-like9 and persimmons-like.10 In addition, quite a few methods have been developed for preparing these compounds, such as sol–gel, microwave-assisted chemical synthesis, Czochralski method and solid-state reaction.11–16 However, most of the above methods need severe reaction conditions such as high temperature.15,17 Compared with the synthetic techniques listed above, the hydrothermal method is very mild (the reaction temperature is often below 200 °C). Additionally, the hydrothermal strategy is simple, convenient, safe and scalable, which can affect the crystallization of single particles and allow the control of structures and morphologies of the final product. Organic complexing agents are often used to prepare inorganic materials with uniform and special morphologies for different applications. For instance, Ferrari et al.18 obtained neodymium ion-doped gadolinium (III) oxide (Gd2O3:Nd31) with different particle size by increasing the amount of ethylene diamine tetraacetic acid (EDTA). Fu et al.19 reported the controllable preparation a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2013.6 856
J. Mater. Res., Vol. 28, No. 6, Mar 28, 2013
http://journals.cambridge.org
Downloaded: 14 Mar 2015
of hollow-structured bismuth molybdate (Bi2MoO6) spheres as high-performance visible-light-driven photocatalysts with the aid of ethylene glycol. Besides, our group recently reported that erythrocyte-like holmium vanadate (HoVO4) and lutetium vanadate (LuVO4) nanocrystals could be successfully fabricated via the complexing agentassisted hydrothermal method.20,21 Although the synthesis and properties of rare earth orthovanadate nanomaterials have been well documented, m
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