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Crystal structures and enhancement of photoluminescence intensities by effective doping for lithium tantalate phosphors

机译：通过有效掺杂钽酸锂磷光体来增强晶体结构并增强光致发光强度

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摘要

Crystal structures of (Li0.925Eu0.0253+)TaO3, (Li0.968Eu0.0323+)(Ta0.81Ti0.19)O-2.937, (Li0.967Sm0.0333+) (Ta0.89Ti0.11)O-2.978, and (Li0.950Sm0.0333+Mg0.017)(Ta0.89Ti0.11)O-2.987 were investigated by X-ray powder diffraction. The initial structural parameters, taken from those of the isomorphous compound (Li0.977Eu0.0233+)(Ta0.89Ti0.11)O-2.968 (space group R3c and Z = 6), were refined by the Rietveld method. A pattern-fitting method based on the maximum-entropy method was subsequently used to determine the three-dimensional electron-density distributions (EDDs) that are free from the structural bias. We confirmed that the EDDs are in accord with the resulting structural models, each of which was composed of the [(Ta, Ti)O-6] octahedron and [(Li, Eu, Sm, Mg)O-12] polyhedron. We compared these polyhedra and found that the prominent difference among these compounds was the centroid-to-(Li, Eu, Sm, Mg) distance (eccentricity) of [(Li, Eu, Sm, Mg)O-12]. The high correlation was demonstrated between the magnitude of eccentricity and photoluminescence intensity under near ultraviolet excitation. (C) 2015 International Centre for Diffraction Data.
机译：（Li0.925Eu0.0253 +）TaO3，（Li0.968Eu0.0323 +）（Ta0.81Ti0.19）O-2.937，（Li0.967Sm0.0333 +）（Ta0.89Ti0.11）O-2.978的晶体结构通过X射线粉末衍射研究了（Li0.950Sm0.0333 + Mg0.017）（Ta0.89Ti0.11）O-2.987。初始结构参数取自同构化合物（Li0.977Eu0.0233 +）（Ta0.89Ti0.11）O-2.968（空间群R3c，Z = 6），并通过Rietveld方法精制。随后使用基于最大熵方法的图案拟合方法来确定没有结构偏差的三维电子密度分布（EDD）。我们确认，EDD与所得结构模型一致，每个结构模型均由[（Ta，Ti）O-6]八面体和[（Li，Eu，Sm，Mg）O-12]多面体组成。我们比较了这些多面体，发现这些化合物之间的主要区别是[（Li，Eu，Sm，Mg）O-12]的质心到（Li，Eu，Sm，Mg）的距离（偏心率）。在近紫外线激发下，偏心率的大小与光致发光强度之间具有高度相关性。 （C）2015年国际衍射数据中心。

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