Valence-change of Eu and Its Effect on the Luminescent Properties&lt;br/&gt;of Long Afterglow Phosphor SrAl&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;∶Eu,Dy

CHEN Xue-hua; HU Yi-hua; WANG Yin-hai; LIU Cheng; CHEN Ren; LIAO Feng

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Valence-change of Eu and Its Effect on the Luminescent Properties of Long Afterglow Phosphor SrAl2O4∶Eu,Dy

paper | 更新时间：2020-08-12

- Valence-change of Eu and Its Effect on the Luminescent Properties of Long Afterglow Phosphor SrAl2O4∶Eu,Dy
- Chinese Journal of Luminescence Vol. 30, Issue 1, Pages: 40-46(2009)
- 作者机构：
 
 广东工业大学物理与光电工程学院,广东广州,510006
- 作者简介：
- 基金信息：
- DOI：
 CLC： O482.31;O614.33
- Received：22 May 2008，
 
 Revised：02 January 1900，
 
 Published Online：20 February 2009，
 
 Published：20 February 2009
- 稿件说明：
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CHEN Xue-hua, HU Yi-hua, WANG Yin-hai, et al. Valence-change of Eu and Its Effect on the Luminescent Properties of Long Afterglow Phosphor SrAl2O4∶Eu,Dy[J]. Chinese journal of luminescence, 2009, 30(1): 40-46.
DOI：

CHEN Xue-hua, HU Yi-hua, WANG Yin-hai, et al. Valence-change of Eu and Its Effect on the Luminescent Properties of Long Afterglow Phosphor SrAl2O4∶Eu,Dy[J]. Chinese journal of luminescence, 2009, 30(1): 40-46. DOI：

摘要

采用高温固相法

先在空气气氛下制备了SrAl

∶ Eu

后对其进行还原→氧化→还原处理。X射线衍射结果表明

经过还原→氧化→还原处理后样品的晶体结构没有改变。样品的发射光谱测试表明

在高温空气气氛下有少量的Eu

还原成Eu

。Eu

和Eu

有不同的发光特性

产生的是线状特征光谱

发射峰值在592

616 nm。Eu

产生的是带状光谱

带的中心位置在513 nm。经过还原处理的样品和经过氧化处理的样品相比

的浓度得到显著提高

而Eu

的浓度则急剧下降。对Eu

的氧化、Eu

的还原的机理进行了细致地讨论。另外

样品的热释光谱测试表明

经过氧化气氛处理和经过还原气氛处理过的样品的热释光峰值有很大的变化

但陷阱能级深度基本不变

在0.65 eV左右。这表明

对长余辉材料SrAl

∶ Eu

Dy进行还原→氧化→还原处理

Eu离子价态和发光强度会产生变化

并不影响其中Dy离子的陷阱能级。

Abstract

As novel functional materials

long afterglow phosphors have drawn more and more attention in recent years because of a constantly growing market for their applications in traffic signs

emergency signage

watches and clocks

textile printing

among others. Amid the newly developed long afterglow materials which have already found commercial use

green-emitting SrAl2O4∶Eu2+

Dy3+ is of special interest because of its high quantum efficiency

good stability and excellent persistent luminescence combined with an easy proces-sability. However the mechanism of afterglow phosphors is still unclear

even the effect of the reductive using on the producing process on the luminescence is not well studied. In this paper

compounds of SrAl2O4∶Eu

Dy were prepared in air atmosphere by high temperature solid state reaction firstly

and then were treated in weak reductive atmosphere (95%N2+5%H2).Thirdly

in air atmosphere again

and finally

in weak reductive atmosphere (95%N2+5%H2). The effect of this process on the structure

luminescent properties

and themoluminescent spectra of the samples were studied by X-ray diffraction (XRD)

fluorescent spectrophoto-meter and thermoluminescence dosimeter (TLD) respectively. The monoclinic structure remains the same irrespective of the process

and is in good agreement with that of the powder diffraction file (JCPDS) 34-0379 (SrAl2O4). The reduction of Eu3+→Eu2+ was firstly observed in the aluminate phosphor of SrAl2O4∶Eu

Dy synthesized in air condition and the reductive mechanism was also discussed in this paper. Eu3+ shows completely different luminescent properties with Eu2+ in SrAl2O4. Eu3+ has two narrow

intense spectra peaking at 592 nm and 612 nm

which resulted from the 5D0→7F1 transition and 5D0→7F4 transition respectively

implied that the Eu3+ may occupy two different lattice sites in the host crystal lattice; while Eu2+ has only one broad band spectra peaking at 513 nm

which resulted from the 4f65d→4f7 transition. The emission of Dy3+ was not found in all the four samples

indicated that the Dy3+ ions play a roll as trap centre in the phosphor

but not the luminescence centre. The concentration of Eu2+ in the samples treated in weak reductive atmosphere greatly increased whereas the concentration of Eu3+greatly decreased when compared to the samples treated in air atmosphere. The samples treated in weak reductive atmosphere have much higher thermoluminescent peak than that of the samples treated in air atmosphere. But all the samples

irrespective being treated in air atmosphere or reductive atmosphere

have the same trap depth (about 0.65 eV)

which derived from Dy3+. All these phenomena indicated that

for the long after-glow phosphor material of SrAl2O4∶Eu

Dy prepared in air atmosphere

the process of being treated in weak reductive atmosphere

air atmosphere and weak reductive atmosphere orderly

changes the valence of Eu ion and luminescence intensity

but doesnt change the trap depth in the material.

关键词

Keywords

references

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Valence-change of Eu and Its Effect on the Luminescent Properties<br/>of Long Afterglow Phosphor SrAl<sub>2</sub>O<sub>4</sub>∶Eu,Dy

DOI：

摘要

Abstract

关键词

Keywords

references