Abstract
Abstract Eu 2+ /Dy 3+ -doped Sr 2 MgSi 2 O 7 powders were synthesized using a solid-state reaction method with flux (NH 4 Cl). Thebroad photoluminescence (PL) excitation spectra of Sr 2 MgSi 2 O 7 :Eu 2+ were assigned to the 4f 7 -4f 6 5d transition of the Eu 2+ ions,showing strong intensities in the range of 375 to 425 nm. A single emission band was observed at 470 nm, which was the resultof two overlapping subbands at 468 and 507 nm owing to Eu(I) and Eu(II) sites. The strongest emission intensity ofSr 2 MgSi 2 O 7 :Eu 2+ was obtained at the Eu concentration of 3 mol%. This concentration quenching mechanism was attributableto dipole-dipole interaction. The Ba 2+ substitution for Sr 2+ caused a blue-shift of the emission band; this behavior was discussedby considering the differences in ionic size and covalence between Ba 2+ and Sr 2+ . The effects of the Eu/Dy ratios on thephosphorescence of Sr 2 MgSi 2 O 7 :Eu 2+ /Dy 3+ were investigated by measuring the decay time; the longest afterglow was obtainedfor 0.01Eu
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