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- W2364222356 abstract "Some former researches revealed that the composition of Eu,Dy co-doped alkaline earth aluminate plays an important role on the persistent luminescence.However,the researches about the effect of composition on luminescence of phosphors was not systemically carried out up to now,and the relevant mechanisms were not clearly given out.In this paper,Eu,Dy co-doped strontium aluminate phosphors with different composition were synthesized by solid-state reaction,crystal phase composition of phosphors was investigated by XRD technology,emission and excitation spectra and afterglow decay curve were measured via fluorescent(photometer.) The influence of strontium aluminate composition on phosphorescent properties was studied.The(results) of XRD and persistent luminescent properties showed that three crystal phases(SrAl_2O_4Eu~(2+),Dy~(3+);Sr_4Al_(14)O_(25)Eu~(2+),Dy~(3+) and SrAl_4O_7Eu~(2+),Dy~(3+)) with good persistent luminescent properties could be formed by changing Al_2O_3/SrO ratio.From excitation and emission spectra and afterglow decay properties,it can be concluded that with the decreasing of Sr/Al ratio,excitation spectra extend to short wavenumber side,emission peaks take blue-shift,initial afterglow luminance is increased and afterglow life is prolonged.The effect mechanisms were investigated and discussed.There are more O~(2-) ions around the Eu~(2+) ions in Sr~(2+)-poor(phases,) so the effect of crystal field on electron levels of Eu~(2+) ions is bigger(maybe due to the high electro-negativity of oxygen),the electron levels are split more.It is this reason that makes emission peaks blue-shift.Thermoluminescence results showed there were bigger trap depth and higher trap density in Sr~(2+)-poor phases so that the Sr~(2+)-poor phosphors showed better persistent luminescence." @default.
- W2364222356 created "2016-06-24" @default.
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- W2364222356 date "2005-01-01" @default.
- W2364222356 modified "2023-09-25" @default.
- W2364222356 title "Effect of Phase Composition on Luminescent Properties of Eu,Dy Co-doped Strontium Aluminate" @default.
- W2364222356 hasPublicationYear "2005" @default.
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