共掺杂效应对Y2O3：Eu3+和Gd2O3：Eu3+发光影响的理论研究

张睿; 顾牡; 刘小林; 刘冰洁

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共掺杂效应对Y₂O₃：Eu³⁺和Gd₂O₃：Eu³⁺发光影响的理论研究

材料合成及性能 | 更新时间：2020-08-11

- 共掺杂效应对Y₂O₃：Eu³⁺和Gd₂O₃：Eu³⁺发光影响的理论研究
- Theoretical Study of the Co-doped Ions on the Luminescence of Rare-earth Oxides Y₂O₃：Eu³⁺ and Gd₂O₃：Eu³⁺
- 发光学报 2007年28卷第3期页码：383-388
- 作者机构：
  
  同济大学, 波耳固体物理研究所, 波与材料微结构实验室, 上海, 200092
- 作者简介：
- 基金信息：
  
  上海市科委基础研究重点项目(05JC14062)();高等学校优秀青年教师教学科研奖励计划(JRS-2002-123)();上海市教育委员会曙光计划(02SG19)()
- DOI：
  中图分类号： O482.31
- 收稿日期：2006-08-16，
  
  修回日期：2007-01-12，
  
  纸质出版日期：2007-05-20
- 稿件说明：
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张睿, 顾牡, 刘小林, 刘冰洁. 共掺杂效应对Y2O3：Eu3+和Gd2O3：Eu3+发光影响的理论研究[J]. 发光学报, 2007,28(3): 383-388

ZHANG Rui, GU Mu, LIU Xiao-lin, LIU Bing-jie. Theoretical Study of the Co-doped Ions on the Luminescence of Rare-earth Oxides Y2O3：Eu3+ and Gd2O3：Eu3+[J]. Chinese Journal of Luminescence, 2007,28(3): 383-388
张睿, 顾牡, 刘小林, 刘冰洁. 共掺杂效应对Y2O3：Eu3+和Gd2O3：Eu3+发光影响的理论研究[J]. 发光学报, 2007,28(3): 383-388 DOI：

ZHANG Rui, GU Mu, LIU Xiao-lin, LIU Bing-jie. Theoretical Study of the Co-doped Ions on the Luminescence of Rare-earth Oxides Y2O3：Eu3+ and Gd2O3：Eu3+[J]. Chinese Journal of Luminescence, 2007,28(3): 383-388 DOI：

摘要

通过在Y

:Eu

和Gd

:Eu

发光材料中掺入Li

等离子能有效地提高材料的发光强度

根据分子动力学和密度泛函计算的结果

认为这些离子多倾向于形成

格位附近的间隙缺陷对

导致部分Y(Gd)O的键长增加

提高了材料的量子效率的同时使得激发峰位出现红移

是引起材料发光增强的一个原因.

Abstract

Rare earth oxide is widely used in X-ray imaging and cathode-ray imaging technology. In experiment

it is found that co-doped ions

such as Li

with luminescence center Eu

could increase the light yield of rare earth oxide. However the mechanism for this effect is still under debates. It is well known that the co-doped ions may have the flux effect

which will have an influence on the size of the particle. But other mechanism may coexist to enhance the light output of the material. Based on molecular dynamics and density functional simulation (ADF2005)

the defect forming mechanism associated with co-doped ions and its influence on light emission yield of rare earth oxide luminescent material were studied. The results show that the co-doped ions (Li

) tend to form interstitial pairs around

site in rare earth oxide (Y

)

and caused the increase of Y(Gd)O bond length of host lattice. This factor leads to the decrease of phonon energy and non-radiation transition rate for the rare earth oxide

thus causesd the increase of host's quantum efficiency and light emission yield of luminescence center Eu

doped into the host material. With the extension of Y(Gd)O bonds

the deformed host lattice also causes the band gap of the material narrower and the small red shift of HL peaks in the excitation spectrum. However

limited by the simulation power of our computer system and the methods we adopted

our results here can only give qualitative explain to the experimental results. In case of X-ray excitation

smaller band gap will leads to more electron-hole pairs producing in the excitation process and larger absorption efficiency

which means the light emission yield will be increased even greater compared with the undoped samples. The result of simulation also shows that the optimal molar concentration ratio for co-doped ions and rare earth element is 5.77%

which is close to the experimental result. On conclusion

the co-doping effect of Li

Al in rare earth oxide produce the deform in the host lattice

the deform will cause the increase of quantum efficiency of the material. This might be one of factors that may cause the increase in light emission yield.

关键词

Keywords

references

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