| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1610001 | Journal of Alloys and Compounds | 2015 | 4 Pages |
•SrAlSi4N7:Ce3+, Eu2+ phosphors were prepared successfully.•The efficient energy transfer from Ce3+ to Eu2+ in SrAlSi4N7 were confirmed.•The energy transfer mechanism from Ce3+ to Eu2+ was proved to be dipole–dipole interaction.•The emitting color of phosphors can be tuned based on different Eu2+/Ce3+ ratios.
A series of Ce3+- and Eu2+-coactivated SrAlSi4N7 phosphors have been synthesized by the solid-state reaction method and their luminescence properties have been investigated as a function of activator and co-activator concentrations for the first time. The energy transfer from Ce3+ to Eu2+ has been verified by directly observing the significant spectra overlap and the systematic relative intensity variation of emission bands of Ce3+ and Eu2+. The energy transfer from Ce3+ to Eu2+ has been demonstrated to be a resonant type, via dipole–dipole mechanism. The critical distance of Ce3+ and Eu2+ has also been calculated. The emitting color of phosphors can be tuned from yellow to red with increasing Eu2+/Ce3+ ratio. These results indicate SrAlSi4N7:Eu2+, Ce3+ phosphor with appropriate tuning of activator and co-activator content might be promising as an UV or blue-convertible color-tunable phosphor for white LEDs.
