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Li-self doping effect on the LiAl_5O_8 luminescent properties

机译：Li自掺杂对LiAl_5O_8发光性能的影响

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摘要

The influence of Li self-doping effect on the structural and optical properties of LiAl5O8 was investigated. X-ray diffraction (XRD) results indicated the samples present high crystalliny degree and single crystalline phase. Scanning Electron Microscopy (SEM) images showed nanosized particles disposed in agglomerates. X-ray Absorption Near Edge Spectroscopy (XANES) indicated that the Al local geometry is similar for both sets of samples, independent on the Li excess. X-ray Fluorescence (XRF) mapped intrinsic contaminants (Fe and Cr) from the precursors. Photoluminescence (PL) and X-ray Excited Optical Luminescence (XEOL) emission spectra presented broad bands and transitions associated with Fe3+, Cr3+ and defects from the host. XEOL excitation spectra presented positive edge and luminescent grow tendency with the increase of the excitation energy around the Al K-edge. The observed optical transitions by the excitation with X-rays, ultraviolet and visible were more expressive in the redear infrared range.
机译：研究了Li自掺杂效应对LiAl5O8结构和光学性能的影响。 X射线衍射（XRD）结果表明样品具有高结晶度和单晶相。扫描电子显微镜（SEM）图像显示纳米颗粒以团聚形式分布。 X射线吸收近边缘光谱法（XANES）表明，两组样品的Al局部几何形状相似，而与Li过量无关。 X射线荧光（XRF）绘制了前体中的固有污染物（Fe和Cr）。光致发光（PL）和X射线激发光致发光（XEOL）发射光谱显示了与Fe3 +，Cr3 +和主体缺陷相关的宽谱带和跃迁。 XEOL激发光谱随着Al K边缘周围激发能的增加呈现出正边缘和发光增长趋势。在红/近红外范围内，通过X射线，紫外线和可见光激发观察到的光学跃迁更具表现力。

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