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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Influence of the Matrix on the Red Emission in Europium Self-Activated Orthoceramics
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Influence of the Matrix on the Red Emission in Europium Self-Activated Orthoceramics

机译：基质对Euro自活化正交陶瓷中红色发射的影响

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摘要

Different oxide host matrices of ABO(4) with A(3+) (Eu) and B5+ (Nb, Ta, and Sb) were prepared to investigate the solid state luminescence behavior of Eu3+ as a self-activated emitter in orthoceramics. Crystal structures, phonon modes, metal valence states, optical excitation, and emission luminescence properties including emission decay curves, colorimetry, and nonstoichiometry defects were studied using X-ray diffraction (XRD), Raman spectroscopy, photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR). Classical intraconfigurational (f-f transitions), interconfigurational (4f(n-1)5d -> 4f(n)), and charge transfer bands (X5+-O2-) were observed, besides split Stark levels indicating low local symmetry. The influence of host matrices on the optical behavior of orthocompounds was noticed by changes in the energy of the typical Eu3+ transitions. In this case, the larger blue-shifted peaks were observed for EuSbO4 and the larger red-shifted positions for EuNbO4, with respect to emission spectra of orthocompounds studied here. These results were correlated to the respective fifth ionization energies and covalent fraction as well as to the crystal structures exhibited by the different host matrices (I2/a: Nb, Ta; P(2)1/c: Sb). The presence of more than one component for the D-5(0) -> F-7(0) transition in each compound was observed at low temperature, and it could be justified by nonstoichiometric defects like the oxygen vacancy and Eu2+. These typical defects are observed in nonstoichiometric oxide materials, and they were analyzed in the orthoceramics by EPR and XPS spectroscopy. Finally, the lifetime of the D-5(0) state and chromaticity diagrams confirmed our orthoceramics as good optical emitters in the red-end region.
机译：制备了具有A（3+）（Eu）和B5 +（Nb，Ta和Sb）的ABO（4）的不同氧化物基质，以研究Eu3 +作为自激活发射体在固态陶瓷中的固态发光行为。使用X射线衍射（XRD），拉曼光谱，光致发光（PL），X射线光电子来研究晶体结构，声子模式，金属价态，光激发和包括发光衰减曲线，比色法和非化学计量缺陷在内的发射发光特性光谱（XPS）和电子顺磁共振（EPR）。观察到经典的构内（f-f跃迁），构间（4f（n-1）5d-> 4f（n））和电荷转移带（X5 + -O2-），以及分开的Stark水平表明局部对称性低。通过典型的Eu3 +跃迁的能量变化，可以注意到基质对邻位化合物光学行为的影响。在这种情况下，就此处研究的邻位化合物的发射光谱而言，对于EuSbO4观察到较大的蓝移峰，对于EuNbO4观察到较大的红移峰。这些结果与各自的第五电离能和共价分数以及由不同基质（I2 / a：Nb，Ta; P（2）1 / c：Sb）表现出的晶体结构相关。在低温下观察到每种化合物中存在一个以上的D-5（0）-> F-7（0）过渡组分，这可以通过非化学计量缺陷（如氧空位和Eu2 +）来证明。这些典型缺陷在非化学计量的氧化物材料中观察到，并通过EPR和XPS光谱在原陶瓷中进行了分析。最终，D-5（0）状态和色度图的寿命证实了我们的原陶瓷在红端区域中是良好的光发射器。

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