Enhanced luminescence properties of Sr3−xEuxAlO4−yNyF phosphors

Luminescent materials with the chemical formula Sr 3− x Eu x AlO 4− y N y F were prepared by a solid-state reaction. X-ray diffraction (XRD) patterns, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), photoluminescence emission and excitation spectra, the lifetime, the temperature-dependent luminescence, and the effects of Eu 3+ and N 3− concentrations were investigated in detail. Partial substitution of Sr 2+ by Eu 3+ and O 2− by N 3− in Sr 3− x Eu x AlO 4− y N y F contributes to form quadrangular crystals, and enhance the thermal stability against the temperature quenching effect. After the partial replacement of Sr 2+ by Eu 3+ and O 2− by N 3− ions in the Sr 3 AlO 4 F host structure, the emission intensity was enhanced and the charge-transfer band of O 2p →Eu 4f shifted to higher wavelength.