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A facile single-step procedure for the synthesis of luminescent Ln 3+:YVO4 (Ln = Eu or Er + Yb)-silica nanocomposites

机译:合成发光Ln 3+:YVO4(Ln = Eu或Er + Yb)-二氧化硅纳米复合材料的简便单步程序

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摘要

A simple and single-step method for the production of Ln-doped YVO 4 nanocrystals and their simultaneous encapsulation in a silica network based on the pyrolysis of liquid aerosols at 800 °C is reported. The procedure is illustrated for Yb,Er:YVO4-silica nanocomposites consisting of spherical particles, which present up-converted green luminescence after IR excitation whose efficiency increased on annealing up to 1000 °C due to the release of impurities (adsorbed water, and residual anions). XPS spectroscopy and TEM observations revealed that the surface of the composite particles was enriched in silica, which would facilitate their functionalisation required to use them in biological applications. The procedure can also be used to prepare other rare earth doped systems as illustrated for the case of Eu-doped YVO4/silica having down-converted red luminescence. © 2010 Elsevier B.V. All rights reserved.
机译:报道了一种简单而一步的方法来生产Ln掺杂的YVO 4纳米晶体,并基于在800°C的液体气溶胶的热解将它们同时包封在二氧化硅网络中。说明了由球形粒子组成的Yb,Er:YVO4-二氧化硅纳米复合材料的程序,该复合物在IR激发后呈现上转换的绿色发光,由于杂质(吸附的水和残留物)的释放,在高达1000°C的退火下效率有所提高阴离子)。 XPS光谱和TEM观察表明,复合颗粒的表面富含二氧化硅,这将有助于其在生物学应用中使用所需的功能化。该过程还可以用于制备其他稀土掺杂系统,如具有向下转换的红色发光的Eu掺杂YVO4 /二氧化硅的情况所示。 ©2010 Elsevier B.V.保留所有权利。

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