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.
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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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Lü, X., Shu, W., Fang, Q. et al. Roles of doping ions in persistent luminescence of SrAl2O4:Eu2+, RE3+ phosphors. J Mater Sci 42, 6240–6245 (2007). https://doi.org/10.1007/s10853-006-1097-1
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DOI: https://doi.org/10.1007/s10853-006-1097-1