Ion beam induced luminescence studies of LiAlO2 using negative ions

Lithium aluminate (LiAlO₂) is the candidate material for solid tritium breeder applied in the developing fusion reactors. The research of its defect behavior under ion irradiation was proceeded in the negative ions induced luminescence setup of the GIC4117 Tandem accelerator in Beijing Normal University. The ion beam induced luminescence (IBIL) measurement was performed by 20 keV H⁻ ions at room temperature. The luminescence spectra showed seven emission bands: the 4.55 eV may due to a self-trapped exciton (STE), the 4.06 eV and the 1.72 eV may due to impurity or intrinsic defect, the 3.54 eV due to F center, the 3.20 eV due to F⁺ center, the 2.93 eV due to F₂ center, the 2.30 eV due to F-center aggregates (F_n center), respectively. The intensity evolutions of each band with fluence were presented and the corresponding mechanisms were discussed.