Abstract
A novel phosphor, Sr2LaNbO6:Mn4+, is synthesized by conventional solid-state reaction. The phosphor can be excited at 300–500nm and emit a deep-red light. An emission band peak of 694nm is observed from the spin-forbidden transition 2E→4A2 of Mn4+ ions. Energy transfer between the Mn4+–Mn4+ pairs decreases fluorescence decay time from 0.815ms to 0.512ms. The resistance of luminescence against thermal impact is also investigated by emission spectroscopy at heating temperatures from 300K to 500K. The calculated activation energy ΔE (∼0.345eV) demonstrate good thermal stability of the phosphors. All these results indicate that the phosphor can be applied in white-light-emitting diodes.
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