Effects of flux concentration on the structural and luminescent properties of Eu2+-doped SrAl2O4

Eu 2+ -doped SrAl 2 O 4 phosphors were synthesized using a solid-state reaction method. The structural and the luminescent properties of the phosphors were investigated by using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and photoluminescence (PL) excitation and emission spectra. SrAl 2 O 4 :Eu 2+ phosphors with H 3 BO 3 showed a pure monoclinic phase and exhibited a broad green-emission band with a maximum at 520 nm. The luminescence of the phosphors originates from the transition of Eu 2+ ions from the 4f 6 5d 1 excited state to the 4f 7 ground state. These results indicate that SrAl 2 O 4 :Eu 2+ phosphors exhibit potential applications as efficient green emitting phosphors for use in near-ultraviolet light-emitting diodes.