Eu 3+ –Eu 2+ ‐doped xAl 2 O 3 –ySiO 2 and xAl 2 O 3 –zMgO composites phosphors

In this paper, the Eu 3+ –Eu 2+ (4%, molar ratio)‐doped xAl 2 O 3 –ySiO 2 (x = 0–2.5, y = 1–5) and xAl 2 O 3 –zMgO (x = 0–1.5, z = 0–3) composites phosphors with different Al 2 O 3 to SiO 2 (A/S) and Al 2 O 3 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 3+ , and led the relative emission intensity of Eu 2+ /Eu 3+ to change and adjust.