Spectral property of SrLaAlO4 by 350 MeV 56Fe21+ ion beam irradiation

Abstract SrLaAlO4 materials irradiated with 350 MeV 56Fe21+ ions have been studied by Raman spectroscopy, Potoluminescence (PL) spectra and X-ray diffraction (XRD). A wide luminous band appeared after 56Fe21+irons irradiation; and it increase with irradiation dose. The PL peaks intensity of SrLaAlO4 crystal increased rapidly; and the peaks intensity reached the maximum threshold dose at 5 × 1010 ions/cm2. A series of relatively sharp emission peaks are caused by the transition from 2Eg to 4A2g at the spectrum of 1.82eV–2.14eV. In the oxide fluorescent material, the high level excitation transitions (4A2g → 2T2g) are parity and spin forbidden. The peaks caused by the 4A2g → 2T2g transitions is not clearly observed in many fluoride phosphors; while, after high-energy 56Fe21+ ion irradiation, the parity and spin-forbidden transitions have been observed at 2.25eV–2.48eV. It was found that the spin forbidden transition was allowed to somewhat extent due to the lattice vibration; and, the spin orbital coupling caused by mixing 4A2, 2E, 2T2 and 4T2 states.