Luminescence in Ce3+ doped mixed sulphate fluoride phosphors [ NaMgSO4F and Na3SO4F] S. C. Gedam, S. J. Dhoble and S. V. Moharil Eur. Phys. J. Appl. Phys., 37 1 (2007) 73-78 Published online: 15 November 2006 DOI: 10.1051/epjap:2006132