A series of new red phosphors, NaEu(MoO 4 ) 2−2x (SO 4 ) 2x , were prepared by the conventional solid state reaction. Their excitation spectra, emission spectra and decay curves were measured at room temperature. When the SO 4 2− content is in excess of 20%, other phases appear. With the introduction of SO 4 2− , the Mo–O charge transfer band of NaEu(MoO 4 ) 2−2x (SO 4 ) 2x shows red shift, and the excitation intensities of the 4f – 4f transitions of Eu 3+ are strengthened, compared with that of NaEu(MoO 4 ) 2 . The single red light-emitting diodes-based these phosphors were fabricated. The light-emitting diode fabricated with the phosphor NaEu(MoO 4 ) 1.80 (SO 4 ) 0.20 exhibited higher red emission relative to that with NaEu(MoO 4 ) 2 . Bright red light can be observed by naked eyes from the light-emitting diode-based NaEu(MoO 4 ) 1.80 (SO 4 ) 0.20 .