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Our calculations reveal that the self-activated luminescence is mainly attributed to the optical transitions of the excitons bound to the oxygen vacancies (VO), along with their transformation of the charge states 0 ↔ 1+. Furthermore, the eight excitation bands observed in the synchrotron radiation excitation spectra of SPOC Ce3+, Na+ phosphors are successfully assigned according to the ab initio calculated energies and relative oscillator strengths of the 4f1 → 5d1-5 transitions for the Ce3+ ions at both the Sr(1) and Sr(2) sites in the