A series of red phosphors EC+-doped MMgP2O7 (M=Ca,Sr,Ba ) were synthesized by solid-state reaction method.X-ray powder diffraction (XRD) analysis confirmed the formation of pure CaMgP2O7,SrMgP2O7 and BaMgP2O7 phase.Photoluminescence spectra of MMge2O7 (M=Ca,Sr,Ba):Eu3+ phosphors showed a strong excitation peak at around 400 nm,which was coupled with the characteristic emission (350-400 nm) from UV light-emitting diode.The CaMgP2O7:Eu3+,SrMgP2O7:Eu3+ and BaMgP2O7:Eu3+ phosphors showed strong emission bands peaking at 612,593 and 587 nm,respectively.Due to the difference of the ion sizes between Ba2+ (0.142 nm),Sr2+ (0.126 nm),Ca2+ (0.112 nm),Mg2+ (0.072 nm) and Eu3+ (0.107 nm),Eu3+ ions were expected to substitute for different sites m CaMgP2O7,SrMgP2O7 and BaMgP2O7 lattice.