Pr3+/Tm3+共掺LaOF纳米体系中能量转移的光谱学研究-陕西师范大学学报期刊社网站

陕西师范大学学报（自然科学版）

物理学

Pr3+/Tm3+共掺LaOF纳米体系中能量转移的光谱学研究

张喜生，雷瑜，何恩节，朱刚强，伏振兴，郑海荣*

(陕西师范大学物理与信息技术学院，陕西西安 710062)

张喜生，男，助教，研究方向为纳米材料发光.* 通信作者：郑海荣，女，教授，博士研究生导师.Email: hrzheng@snnu.edu.cn.

摘要:

在较低温度下，利用水热法和溶剂热法两种不同方法，分别制备了Pr3+/Tm3+共掺的六方相和四方相晶体结构LaOF纳米颗粒.在波长为355 nm激光激发下，研究了LaOF∶Pr3+/Tm3+共掺纳米体系中Tm3+离子到Pr3+离子的能量转移效应,以及由此产生的Pr3+的荧光辐射.运用光谱学方法对共掺纳米体系荧光辐射性质进行了分析，并对相应的能量转移机理进行了探讨.结果表明：从Tm3+到Pr3+的能量转移源于Tm3+的1D2-3F4与Pr3+的3H4-3P0之间的交叉弛豫.同时，分析讨论了制作方法、样品环境温度、掺杂浓度等因素对能量转移效率和荧光光谱性质所产生的影响.

关键词：

能量转移；交叉弛豫；荧光辐射；稀土离子；纳米晶体

收稿日期：

2010-01-24

中图分类号：

O433.2

文献标识码：

文章编号：

1672-4291(2010)03-0024-05

基金项目：

国家自然科学基金资助项目(10875075)；陕西省自然科学基金资助项目(SJ08-ZT 13).

Doi:

Spectroscopic study of the energy transfer effect in Pr3+/Tm3+ co-doped with LaOF nanocrystals system

ZHANG Xi-sheng, LEI Yu, HE En-jie, ZHU Gang-qiang, FU Zhen-xing, ZHENG Hai-rong*

(College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)

Abstract:

Hexagonal and tetragonal LaOF nanocrystals co-doped with Pr3+ and Tm3+ ions were synthesized at lower temperatures with hydrothermal and solvothermals techniques. By pumping Tm3+ ions with 355 nm Laser in Tm3+ and Pr3+ co-doped with LaOF nanoparticles, the energy transfer effect from Tm3+ to Pr3+ and the fluorescence emission of Pr3+ were studied. The luminescence properties and the mechanism of the energy transfer were investigated with laser spectroscopic method. The results showed that the energy transfer from Tm3+ to Pr3+ was originated from the cross-relaxation of 1D2-3F4 of Tm3+ and 3H4-3P0 of Pr3+. The influence of environmental temperature, concentration of dopant ions and the crystal structure of nanoparticles on the energy transfer efficiency and luminescence properties were discussed also.

KeyWords:

energy transfer； cross relaxation； fluorescence emission； rare earth ions； nanocrystals