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Tb3+掺杂Y2O3纳米晶体中Tb3+离子4f5d跃迁及能量传递的研究

4f5d Transition and Energy Transfer of Tb3+Doped Y2O3Nanocrystalline

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摘要

采用燃烧法制备了不同Tb3+掺杂浓度和不同粒径的Y2O3:Tb纳米晶体粉末样品, 并通过高温退火获得了相应Tb3+掺杂浓度的体材料样品。测量了纳米和体材料样品的发射光谱、激发光谱、X射线衍射谱和荧光衰减曲线, 并拍摄了不同粒径样品的透射电子显微镜(TEM)照片。研究纳米Y2O3:Tb晶体粉末中Tb3+离子的4f5d跃迁发现, 由于在近表面的低结晶度环境和颗粒内部的高结晶度环境中Tb3+离子4f5d跃迁对应的激发峰位置不同, 不同粒径样品中处于这两种环境的Tb3+离子比例也不同, 激发谱的谱线形状存在较大差别, 还对Tb3+离子的能量传递进行了研究, 发现 Y2O3:Tb 晶体粉末中Tb3+的 (5D3, 7F6) →(5D4, 7F0)能量传递类型为受纳米限域效应影响很大的电偶极电偶极相互作用;引起5D4→7F5(543 nm)发光浓度猝灭的是不同Tb3+离子5D4能级之间交换相互类型的能量传递, 此类型的能量传递受纳米限域效应影响较小。

Abstract

Nanocrystal powders of Y2O3:Tb with different Tb3+ doping concentrations and average sizes were prepared by chemical self-combustion, and the bulk samples of corresponding concentrations were also obtained by annealing nano-materials at high temperatures. The emission spectra, excitation spectrum, X-ray diffraction, transmission electron microscopy images and fluorescence decay curves of Y2O3:Tb nanomaterials and bulk materials were measured. Then the 4f8 →4f75d1 transition of Tb3+ ions in Y2O3:Tb nanocrystal powders was studied. Great difference in the excitation spectral line shapes for different sized Y2O3:Tb nanocrystal powders was observed. The change of excitation spectral line shapes is because that the Tb3+ ions exist in two very different local environments——the low crystallization degree of close surface and high crystallization degree inside the particles. The absorption peaks of 4f5d transition are different in these two environments. Also the 5D3→5D4 and 5D4→5D4 energy transfer and luminescence concentration quenching caused by energy transfer were investigated. The (5D3, 7F6) →(5D4, 7F0) energy transfer is caused by interaction of electric dipoles, which is greatly affected by the quantum confinement effect. The concentration quenching of 5D4→7F5 luminescence is resulted by the energy transfer of exchange interaction among 5D4 (Tb) energy levels of different Tb3+ ions. The quantum confinement showed little influence on this type of energy transfer.

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中图分类号:O482.31

所属栏目:材料

基金项目:国家自然科学基金(50572102, 50502031, 10274083)资助课题。

收稿日期:2006-03-16

修改稿日期:2006-06-05

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孟庆裕:中国科学院长春光学精密机械与物理研究所 激发态物理重点实验室, 长春 130033中国科学院研究生院, 北京 100039
陈宝玖:中国科学院长春光学精密机械与物理研究所 激发态物理重点实验室, 长春 130033大连海事大学物理系, 大连 116026
赵晓霞:中国科学院长春光学精密机械与物理研究所 激发态物理重点实验室, 长春 130033中国科学院研究生院, 北京 100039
颜斌:中国科学院长春光学精密机械与物理研究所 激发态物理重点实验室, 长春 130033中国科学院研究生院, 北京 100039
王晓君:中国科学院长春光学精密机械与物理研究所 激发态物理重点实验室, 长春 130033
吕少哲:中国科学院长春光学精密机械与物理研究所 激发态物理重点实验室, 长春 130033
许武:中国科学院长春光学精密机械与物理研究所 激发态物理重点实验室, 长春 130033中国科学技术大学物理系, 合肥 230026

联系人作者:孟庆裕(qingyumeng@yahoo.com.cn)

备注:孟庆裕(1978-), 男, 黑龙江哈尔滨人, 博士研究生, 主要从事稀土掺杂发光材料和纳米材料的制备及其光学性质研究。

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引用该论文

孟庆裕,陈宝玖,赵晓霞,颜斌,王晓君,吕少哲,许武. 4f5d Transition and Energy Transfer of Tb3+Doped Y2O3Nanocrystalline[J]. Acta Optica Sinica, 2007, 27(2): 295-301

孟庆裕,陈宝玖,赵晓霞,颜斌,王晓君,吕少哲,许武. Tb3+掺杂Y2O3纳米晶体中Tb3+离子4f5d跃迁及能量传递的研究[J]. 光学学报, 2007, 27(2): 295-301

被引情况

【1】王进贤,车红锐,董相廷,刘莉,刘桂霞. 静电纺丝技术制备Gd2O3:Eu3+发光纳米纤维与表征. 光学学报, 2010, 30(2): 473-479

【2】廖金生,邱报,温和瑞,刘良彬,陈景林. 单分散球形BaWO4:Tb3+绿色荧光粉合成及光谱性能. 光学学报, 2010, 30(3): 839-843

【3】杨志平,闻建伟,马欣,李立虎,宋兆丰,王凤和,郭颖楠. Ba5CaAl4O12:Tb3+荧光粉的制备与发光特性. 激光与光电子学进展, 2010, 47(5): 51602--1

【4】赵芬,江中伟,冯文林,王柯,冯序. 基于ZnS: Eu2+气敏薄膜的荧光猝灭型硫化氢气体传感器研究. 光学学报, 2015, 35(9): 916001--1

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