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Journal of Materials Science

, Volume 42, Issue 15, pp 6240–6245 | Cite as

Roles of doping ions in persistent luminescence of SrAl2O4:Eu2+, RE3+ phosphors

  • Xingdong LüEmail author
  • Wangen Shu
  • Qin Fang
  • Quanmao Yu
  • Xinqiang Xiong
Article

Abstract

The polycrystalline Eu2+ and RE3+ co-doped strontium aluminates SrAl2O4:Eu2+, RE3+ were prepared by solid state reactions. The UV-excited photoluminescence, persistent luminescence and thermo-luminescence of the SrAl2O4:Eu2+, RE3+ phosphors with different composition and doping ions were studied and compared. The results showed that the doped Eu2+ ion in SrAl2O4:Eu2+, Dy3+ phosphors works as not only the UV-excited luminescent center but also the persistent luminescent center. The doped Dy3+ ion can hardly yield any luminescence under UV-excitation, but can form a electron trap with appropriate depth and greatly enhance the persistent luminescence and thermo-luminescence of SrAl2O4:Eu2+. Different co-doping RE3+ ions showed different effects on persistent luminescence. Only the RE3+ ion (e.g. Dy3+, Nd3+), which has a suitable optical electro-negativity, can form the appropriate electron trap and greatly improve the persistent luminescence of SrAl2O4:Eu2+. Based on above observations, a persistent luminescence mechanism, electron transfer model, was proposed and illustrated.

Keywords

Electron Trap Luminescent Center Hole Trap SrAl2O4 Crystal Matrix 

Notes

Acknowledgements

The financial support from the University of Jiangxi Finance and Economy as well as Jiangxi Provincial Department of Education (project [2007]260) is gratefully acknowledged.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Xingdong Lü
    • 1
    Email author
  • Wangen Shu
    • 2
  • Qin Fang
    • 1
  • Quanmao Yu
    • 1
  • Xinqiang Xiong
    • 1
  1. 1.Institute of Functional MaterialsJiangxi University of Finance and EconomyNanchangP.R. China
  2. 2.College of Chemistry and Chemical EngineeringCentral South UniversityChangshaP.R. China

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