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Na3GdSi2O7∶Tb3+荧光粉发光特性及Gd3+→Tb3+之间的能量传递

Luminescent Properties of Phosphor Na3GdSi2O7∶Tb3+∶Tb3+ and Gd3+→Tb3+ Energy Transfer

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摘要

采用高温固相法合成了Na3Gd1-xTbxSi2O7(x=0.01,0.02,0.04, 0.06, 0.08, 0.1)系列荧光粉。研究了荧光粉的真空紫外-可见发光光谱和荧光寿命, 讨论了Tb3+在扭曲八面体结构(标示为Gd(1)3+)和正三棱柱构型(标示为Gd(2)3+)两种格位中的最低5d轨道能级。同时研究了Gd3+→Tb3+ 之间无辐射能量传递速率K和无辐射能量传递效率η。研究结果表明: Tb3+在Gd(1)3+格位中的最低允许跃迁和禁戒跃迁的5d轨道能级分别位于235 nm和280 nm, 在Gd(2)3+格位中的最低允许跃迁和禁戒跃迁的5d轨道能级分别位于224 nm和256 nm。随着Tb3+浓度的增加, 能量传递效率及速率显著增大, 说明在Na3Gd1-xTbxSi2O7中存在有效的Gd3+-Tb3+能量传递。

Abstract

Tb3+ doped sodium gadolinium pyrosilicate phosphors Na3Gd1-xTbxSi2O7 were prepared using a high-temperature solid-state reaction technique. The spectroscopic properties of Na3Gd1-x-TbxSi2O7 in VUV-UV-Vis range and fluorescent lifetimes were investigated. The lowest 5d orbitals of Tb3+ in two sites both 6-fold distorted octahedron coordination (trigonal antiprism tap) (Gd3+(1)) and 6-fold regular trigonal prism coordination (tp) (Gd3+(2)) were discussed. The lowest 5d orbitals of Tb3+ in Gd3+(1) is 235 nm for allowed transition, and 280 nm for forbidden transition. The lowest 5d orbitals of Tb3+ in Gd3+(2) is 224 nm for allowed transition, and 256 nm for forbidden transition. The nonradiative energy-transfer rate K and energy-transfer efficiency η were also investigated. The results show that there is efficient Gd3+-Tb3+ energy-transfer in Na3Gd1-xTbxSi2O7, for K and η increasing with the increasing of Tb3+concentration.

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中图分类号:O482.31

DOI:10.3788/fgxb20133408.0970

基金项目:广州市珠江科技新星项目(2011J2200034); 广东省战略新兴产业项目(粤财工[2010]633号)资助项目

收稿日期:2013-05-01

修改稿日期:2013-05-31

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倪海勇:广州有色金属研究院 稀有金属研究所, 广东 广州510650
梁宏斌:中山大学 化学与化学工程学院, 广东 广州510275
王灵利:广州有色金属研究院 稀有金属研究所, 广东 广州510650
张秋红:广州有色金属研究院 稀有金属研究所, 广东 广州510650

联系人作者:倪海勇(nhygd@163.com)

备注:倪海勇(1976-), 男, 浙江上虞人, 主要从事稀土发光材料的研究。

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引用该论文

NI Hai-yong,LIANG Hong-bin,WANG Ling-li,ZHANG Qiu-hong. Luminescent Properties of Phosphor Na3GdSi2O7∶Tb3+∶Tb3+ and Gd3+→Tb3+ Energy Transfer[J]. Chinese Journal of Luminescence, 2013, 34(8): 970-975

倪海勇,梁宏斌,王灵利,张秋红. Na3GdSi2O7∶Tb3+荧光粉发光特性及Gd3+→Tb3+之间的能量传递[J]. 发光学报, 2013, 34(8): 970-975

被引情况

【1】肖林久,耿艳丽,谢颖,姜新东,崔永强,汪书东. 紫外激发Ba2SiO4∶Gd3+,Tb3+的发光性能. 发光学报, 2016, 37(6): 644-649

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