Roles of doping ions in persistent luminescence of SrAl2O4:Eu, RE phosphors
The polycrystalline Eu and RE co-doped strontium aluminates SrAl2O4:Eu, RE were prepared by solid state reactions. The UV-excited photoluminescence, persistent luminescence and thermo-luminescence of the SrAl2O4:Eu, RE phosphors with different composition and doping ions were studied and compared. T...
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Published in | Journal of materials science Vol. 42; no. 15; pp. 6240 - 6245 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
01.08.2007
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Online Access | Get full text |
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Summary: | The polycrystalline Eu and RE co-doped strontium aluminates SrAl2O4:Eu, RE were prepared by solid state reactions. The UV-excited photoluminescence, persistent luminescence and thermo-luminescence of the SrAl2O4:Eu, RE phosphors with different composition and doping ions were studied and compared. The results showed that the doped Eu ion in SrAl2O4:Eu, Dy phosphors works as not only the UV-excited luminescent center but also the persistent luminescent center. The doped Dy 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:Eu. Different co-doping RE ions showed different effects on persistent luminescence. Only the RE ion (e.g. Dy, Nd), which has a suitable optical electro-negativity, can form the appropriate electron trap and greatly improve the persistent luminescence of SrAl2O4:Eu. Based on above observations, a persistent luminescence mechanism, electron transfer model, was proposed and illustrated. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 content type line 23 ObjectType-Feature-1 |
ISSN: | 0022-2461 |
DOI: | 10.1007/s10853-006-1097-1 |