Crystal structure and photoluminescence of Mn²⁺ - Mg ²⁺ codoped gamma aluminum oxynitride (γ-AlON): A promising green phosphor for white light-emitting diodes

This letter reports on the crystal structure and luminescence of a green gamma aluminum oxynitride phosphor. This phosphor, codoped with Mn²⁺ and Mg²⁺, shows a single cubic spinel phase, with Mn²⁺ and Mg²⁺ substituting Al3+ in the tetrahedral sites. It shows a broad emission band centered at 520 nm and a full width at half maximum of 44 nm. The green phosphor exhibits a small thermal quenching and high internal quantum efficiency of 62% under the blue light irradiation, enabling it to be used in high color rendering white light-emitting diodes.