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Structural and photoluminescent properties of EuF_3 nanoparticles in zeolite A

机译：沸石A中EuF_3纳米粒子的结构和光致发光特性

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摘要

We report the structural and photoluminescence studies on EuF3-doped zeolite A samples, which were prepared by a diffusion method from liquid to solid state phase. The samples were studied by transmission electron microscopy and by room and low temperature photoluminescence measurements. The microstructural analysis shows that EuF_3 crystalline nanoparticles were formed inside the zeolites matrix. The photo-luminescence properties of the EuF_3 enclosed in the zeolites show some remarkable differences with those of isolated EuF_3 powder. The emission spectra of EuF_3-doped zeolite A show a dependence on the excitation wavelength, which was related to excitonic size effects. It was observed emission of the Eu~(3+)-ion excited at a wavelength not corresponding to any excitation line in the excitation spectrum of the Eu~(3+)-ion, as consequence of an energy transfer mechanism. The emission of Eu~(3+) ions resulting from this energy transfer process indicates that Eu~(3+)-ions have a different symmetry.
机译：我们报告了EuF3掺杂的沸石A样品的结构和光致发光研究，这些样品是通过从液相到固态的扩散方法制备的。通过透射电子显微镜以及通过室温和低温光致发光测量来研究样品。微观结构分析表明，EuF_3晶体纳米颗粒形成在沸石基质内部。包围在沸石中的EuF_3的光致发光性质与分离的EuF_3粉末有一些显着差异。 EuF_3掺杂的沸石A的发射光谱显示出对激发波长的依赖性，这与激子尺寸效应有关。观察到由于能量转移机理，发射了在与Eu〜（3 +）-离子的激发光谱中的任何激发线都不对应的波长处激发的Eu〜（3 +）-离子。由这种能量转移过程产生的Eu〜（3+）离子的发射表明Eu〜（3+）离子具有不同的对称性。

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