Eu -Eu -doped xAl O -ySiO and xAl O -zMgO composites phosphors.

In this paper, the Eu -Eu (4%, molar ratio)-doped xAl O -ySiO (x = 0-2.5, y = 1-5) and xAl O -zMgO (x = 0-1.5, z = 0-3) composites phosphors with different Al O to SiO (A/S) and Al O to MgO (A/M) ratios were prepared using a high-temperature solid-state reaction under air atmosphere. The effects of the A/S and A/M on luminescence properties, crystal structure, electron spin resonance, and Commission Internationale de l'Eclairage chromaticity coordinates of the samples were systematically analyzed. These results indicated that the different A/S and A/M ratios in the matrix effectively affected the crystal phase, degrees of self-reduction of Eu , and led the relative emission intensity of Eu /Eu to change and adjust.