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Emission enhancement of Eu(III) and/or Tb(III) ions entrapped in silica xerogels with ZnO nanoparticles by energy transfer

机译:ZnO纳米粒子通过能量转移增强包裹在二氧化硅干凝胶中的Eu(III)和/或Tb(III)离子的发射

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摘要

Luminescent materials consisting of Eu(III) and/or Tb(III) ions and quantum dots of the ZnO semiconductor were immobilized in oxide xerogels by the impregnation method. The material's excitation spectra showed the characteristic absorption bands of lanthanide(III) ions and sharp bands at low wavelengths attributed to excitons in the semiconductor nanoparticles. The luminescence emission of Ln(III) ions (Ln = Tb and/or Eu) showed very low intensity when typical excitation wavelengths for both ions were used (lambda(exc) = 394 for Eu(III), 350 nm for Tb(III)). In three-component materials (ZnO quantum dots and Ln(III) ions in oxide xerogels) only the Tb(III) emission could be improved by using an excitation wavelength corresponding to the position of one of the exciton absorption bands. The energy transfer enhancing the Eu(III) emission was possible in the four-component system (ZnO quantum dots plus Tb(III) and Eu(III) incorporated into the oxide matrix). The best results of the Eu(III) emission intensity were obtained when the silica xerogel served as the matrix of the four-component material thermally treated at 80 degrees C. (c) 2006 Elsevier B.V. All rights reserved.
机译:通过浸渍法将由Eu(III)和/或Tb(III)离子和ZnO半导体的量子点组成的发光材料固定在氧化物干凝胶中。该材料的激发光谱显示了镧系元素(III)离子的特征吸收带和归因于半导体纳米粒子中激子的低波长的锐带。当使用两种离子的典型激发波长时,Ln(III)离子(Ln = Tb和/或Eu)的发光发射显示出非常低的强度(Eu(III)的λ(exc)= 394,Tb(III)的350 nm ))。在三组分材料(氧化物干凝胶中的ZnO量子点和Ln(III)离子)中,通过使用与激子吸收带之一的位置相对应的激发波长,只能提高Tb(III)的发射。在四组分系统中(ZnO量子点加Tb(III)和Eu(III)掺入氧化物基质中),可以进行增强Eu(III)发射的能量转移。当二氧化硅干凝胶用作在80摄氏度下热处理的四组分材料的基质时,可获得Eu(III)发射强度的最佳结果。(c)2006 Elsevier B.V.保留所有权利。

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