AX- type (CaS,SrS) phosophors were synthesized through sulfurizing flux and sulfurizing techniques. The optical properties of CaS:Eu, CaS:Bi, SrS:Eu and CaS:Eu+Ce were investigated, New luminescence centers, valence state of europium and energy transfer of Ce→Eu will be presented along with the first synthesis of oxysulfides in these phosphors, i.e., CaSOx:Eu and SrSOx:Eu. The promising usage of these phosphors in H-D T.V. application will be also presented and discussed.