Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex, UB8 3PH, UK.
Nanoscale. 2013 Sep 21;5(18):8640-6. doi: 10.1039/c3nr01034a.
Y2O2S and Gd2O2S phosphor lattices activated with a range of Tb(3+) concentrations have been successfully prepared as nanoparticles and their emission properties have been characterized using SEM, XRPD, photoluminescence spectroscopy and cathodoluminescence. (5)D3-(5)D4 cross relaxation processes between Tb(3+) cations were observed in both Y2O2S and Gd2O2S as a function of Tb(3+) concentration. In the Y2O2S host lattice, the predominant emission colour shifts from blue to green with increased Tb(3+) concentration. In contrast, green emission is always predominant in Gd2O2S at Tb(3+) concentrations from 0.1 mol% to 5 mol%. This finding is explained in accordance with previous reports on the bulk materials that found the Gd2O2S lattice has a lower charge transfer state than the Y2O2S host lattice.
已成功制备出一系列 Tb(3+)浓度的 Y2O2S 和 Gd2O2S 荧光粉纳米晶，并通过扫描电子显微镜、X 射线粉末衍射、荧光光谱和阴极发光对其发射特性进行了表征。随着 Tb(3+)浓度的增加，观察到 Y2O2S 和 Gd2O2S 中 Tb(3+)阳离子之间的(5)D3-(5)D4 交叉弛豫过程。在 Y2O2S 基质晶格中，随着 Tb(3+)浓度的增加，主要发射颜色从蓝色变为绿色。相比之下，在 Tb(3+)浓度从 0.1 mol%到 5 mol%时，Gd2O2S 中总是呈现绿色发射。这一发现与关于体材料的先前报告一致，该报告发现 Gd2O2S 晶格的电荷转移态低于 Y2O2S 基质晶格。
