Effects of the host lattice and doping concentration on the colour of Tb3+ cation emission in Y2O2S:Tb3+ and Gd2O2S:Tb3+ nanometer sized phosphor particles
Effects of the host lattice and doping concentration on the colour of Tb3+ cation emission in Y2O2S:Tb3+ and Gd2O2S:Tb3+ nanometer sized phosphor particles
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DOI：
10.1039/c3nr01034a
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发表时间：
2013-01-01
期刊：
影响因子：
6.7
通讯作者：
Silver, Jack
中科院分区：
文献类型：
--
作者：
Yan, Xiao;Fern, George R.;Silver, Jack
成功制备了在一定Tb3+浓度下活化的Y2O2S和Gd2O2S荧光粉晶格，并利用SEM、XRPD、光致发光光谱和阴极发光对其发射特性进行了表征。在Y2O2S和Gd2O2S中均观察到Tb3+阳离子之间的D-5(3)-D-5(4)交叉弛豫过程，并与Tb3+浓度有关。在Y2O2S主晶格中，随着Tb3+浓度的增加，主发射色由蓝色变为绿色。相比之下，Tb3+浓度在0.1 ~ 5 mol%范围内，Gd2O2S的绿色发光占主导地位。这一发现与先前关于块体材料的报道一致，发现Gd2O2S晶格比Y2O2S主晶格具有更低的电荷转移状态。
Y2O2S and Gd2O2S phosphor lattices activated with a range of Tb3+ concentrations have been successfully prepared as nanoparticles and their emission properties have been characterized using SEM, XRPD, photoluminescence spectroscopy and cathodoluminescence. D-5(3)-D-5(4) cross relaxation processes between Tb3+ cations were observed in both Y2O2S and Gd2O2S as a function of Tb3+ concentration. In the Y2O2S host lattice, the predominant emission colour shifts from blue to green with increased Tb3+ concentration. In contrast, green emission is always predominant in Gd2O2S at Tb3+ 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.