Study on the luminescence enhancement of NaLaMgWO

Eu3+ doped NaLaMgWO6 red phosphors were prepared by solid state sintering method. The electronic structures of the phosphors are evaluated through density functional theory calculation. The band structure and density of states are studied. Y3+ or Lu3+ ions were adopted to enhance the luminescence properties of the red phosphors. When excited at 465 nm, these phosphors present strong red emission at 618 nm. The octahedral distortion leads to the improvement of the luminescence performance of the NaLaMgWO6: Eu3+ phosphors. The photoluminescence intensity at 150 °C is 77% of that at room temperature. The chromaticity coordinates of prepared phosphors are in the red region and near the standard value for red color. These results indicate that this series of tungstate phosphors can serve as a potential red emitting material for lighting devices.