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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Luminous Characteristics and ~(89)Y-Static NMR in Red Phosphor, Eu-Doped Y_2O_3
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Luminous Characteristics and ~(89)Y-Static NMR in Red Phosphor, Eu-Doped Y_2O_3

机译：Eu掺杂Y_2O_3的红色荧光粉的发光特性和〜（89）Y-静态NMR

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摘要

Luminous properties of a red phosphor, Eu-Y_2O_3 (Eu-doped Y_2O_3) have been studied by ~(89)Y (nuclear spin 1/2)-static NMR. Pure Y_2O_3 showed an anisotropic pattern with the peak centered at 299 ppm assigned to the Y atom in the site, where none of the 12 nearest neighbouring Y atoms are substituted by an Eu atom. The signal became broader with increasing doped Eu content. Additionally, a shoulder peak assigned to the Y atom in the site where one of the 12 nearest neighbouring Y atoms was replaced by one Eu atom appeared around 100-110 ppm in the samples with more than 1 mol/% Eu content. The spin-spin relaxation of the centered signal was mainly dominated by the dipole-dipole interaction mechanism between the ~(89)Y nucleus and the paramagnetic electrons of Eu~(3+) with 4f~6 electron configuration which substituted at the second nearest and further neighbouring Y. In conclusion, the line-broadening of ~(89)Y signal at constant Eu content was correlated with the Eu distribution on the basis of the facts that the phosphor sample with higher brightness showed broader linewidth and the intensity of the ESR signal corresponding to the lattice defects has no relation to the brightness.
机译：通过〜（89）Y（核自旋1/2）-静态NMR研究了红色荧光粉Eu-Y_2O_3（Eu掺杂的Y_2O_3）的发光特性。纯的Y_2O_3表现出各向异性模式，该峰的中心位置为299 ppm，该位置的Y原子位于该位置，其中12个最邻近的Y原子均未被Eu原子取代。随着掺杂Eu含量的增加，信号变得更宽。此外，在样品中Eu含量超过1 mol /％的样品中，在12个最邻近的Y原子之一被一个Eu原子取代的位点上，分配给Y原子的肩峰出现在100-110 ppm左右。居中信号的自旋自旋弛豫主要受〜（89）Y原子核与Eu〜（3+）具有4f〜6电子构型的顺磁性电子之间的偶极-偶极相互作用机制所支配，该电子在第二近位取代。总之，基于以下事实，在恒定Eu含量下〜（89）Y信号的线展宽与Eu分布相关，这是基于以下事实：较高亮度的磷光体样品显示出较宽的线宽和强度。与晶格缺陷相对应的ESR信号与亮度无关。

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