Luminescent Properties of the Rare Earth Ions in Long Afterglow Phosphor Sr2MgSi2O7：Eu2+,Dy3+

CHEN Yong-hu; SHI Chao-shu; KIRM M; TRUE M; VIELHAUER S; ZIMMERER G

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Luminescent Properties of the Rare Earth Ions in Long Afterglow Phosphor Sr₂MgSi₂O₇：Eu²⁺,Dy³⁺

更新时间：2020-08-11

- Luminescent Properties of the Rare Earth Ions in Long Afterglow Phosphor Sr₂MgSi₂O₇：Eu²⁺,Dy³⁺
- Chinese Journal of Luminescence Vol. 27, Issue 1, Pages: 41-46(2006)
- 作者机构：
  
  1. 中国科学技术大学, 物理系, 安徽, 合肥, 230026
  2. Institut f&uuml
  3. r Experimentalphysikder Uuniversitt Hamburg, Luruper Chaussee 149, 22761 Hamburg, German
- 作者简介：
- 基金信息：
- DOI：
  CLC： O482.31
- Received：22 August 2004，
  
  Revised：15 December 2004，
  
  Published：20 January 2006
- 稿件说明：
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陈永虎, 施朝淑, KIRM M, TRUE M, VIELHAUER S, ZIMMERER G. 长余辉材料Sr2MgSi2O7：Eu2+,Dy3+中稀土离子的发光特性[J]. 发光学报, 2006,27(1): 41-46

CHEN Yong-hu, SHI Chao-shu, KIRM M, TRUE M, VIELHAUER S, ZIMMERER G. Luminescent Properties of the Rare Earth Ions in Long Afterglow Phosphor Sr2MgSi2O7：Eu2+,Dy3+[J]. Chinese Journal of Luminescence, 2006,27(1): 41-46
陈永虎, 施朝淑, KIRM M, TRUE M, VIELHAUER S, ZIMMERER G. 长余辉材料Sr2MgSi2O7：Eu2+,Dy3+中稀土离子的发光特性[J]. 发光学报, 2006,27(1): 41-46 DOI：

CHEN Yong-hu, SHI Chao-shu, KIRM M, TRUE M, VIELHAUER S, ZIMMERER G. Luminescent Properties of the Rare Earth Ions in Long Afterglow Phosphor Sr2MgSi2O7：Eu2+,Dy3+[J]. Chinese Journal of Luminescence, 2006,27(1): 41-46 DOI：

摘要

利用同步辐射光源(德国HASYLAB实验室的SUPERLUMI实验站)和真空紫外激光(157.6nm)对新型蓝光发射长余辉材料Sr

MgSi

:Eu

(0.2%)

(8%)进行了光谱研究。在170nm同步辐射光源激发下

观察到对应Eu

:5d-4f跃迁的477nm发射带和对应Dy

:4f-4f跃迁的两组线谱发射

其中只有来自Eu

的5d-4f发射对长余辉光谱有贡献。在157.6nm激光激发下

除了上述发射外

还明显观察到对应Eu

的红色线谱(590

614

626nm)。结合这些光谱特性

对Sr

MgSi

:Eu

中稀土离子的发光特性以及长余辉发光机理进行了讨论

并提出了Eu

充当空穴陷阱的可能性。

Abstract

As novel functional materials

long afterglow phosphors are drawing 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

blue-emitting Sr

MgSi

:Eu

is of special interest because of its excellent persistent luminescence combined with an easy processability. In this paper

the luminescent properties and long afterglow of Sr

MgSi

:Eu

were investigated using synchrotron radiation and VUV laser (157.6 nm) as excitation sources.The emission spectra of Sr

MgSi

:Eu

under 170 nm synchrotron radiation excitation consists of a 477 nm broad band corresponding to 5d-4f transitions of the Eu

ions and two group of line spectra corresponding to

9/2

15/2

transitions (478

483 and 493 nm) and

9/2

13/2

transitions (574

576

579

581 and 585 nm) of Dy

respectively. The excitation spectra of 477 nm emission is dominated by an excitation band at wavelengths longer than 220 nm

which shows a complicated structure

comprising at least three sub-bands (around 250

280 and 310nm)

corresponding to the transition from

7/2

to the higher crystal field components of 4f

states of Eu

.The relatively weaker 170 nm excitation band was ascribed to spin allowed f-d transition of Dy

. At different temperature

the long afterglow emission after irradiation of 170 nm synchrotron radiation was measured 30 seconds after closing the beam-shutter. As in the case of Eu

and Dy

codoped MAl

(M=Ca and Sr)

the long afterglow emission of Sr

MgSi

:Eu

is due to the 5d-4f transitions of the Eu

ions. The laser excited emission spectra exhibit some new features comparing to the synchrotron radiation excited emission spectra. The most obvious new features are three groups of sharp emission lines centred around 590

614 and 626 nm

which are known to be the red emissions of trivalent europium corresponding to intraconfigurational 4f-4f transitions. The strong emission from Eu

indicates an efficient photon-induced process

promoting Eu

to Eu

caused by the much higher excitation density of laser source.The high efficiency of Eu

-Eu

conversion by laser perhaps implies a high possibility of Eu

ions acting as hole traps("Eu

+h")

which is neglected by now in the study of Eu

doped long afterglow phosphors

but may play an important role in the process of the persistent luminescence. At room temperature

the holes are thermally released continuously from these hole traps at Eu site

preparing the Eu

ions to accept the energy released by the electron-hole recombination (perhaps via cross relaxation)

and finally yielding the long afterglow emission from Eu

ions.

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Keywords

references

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