Whitlockite　β-Ca3(PO4)2-type　materials　have　multiple　crystallographic　sites　for　occupying　by　rare　earth　ions　to　achieve　a　strong　and　broadband　emitting　covering　the　spectra　from　cyan　to　deep　red　and　various　abundant　heterogeneous　substitution　ability　to　develop　new　luminescent　materials.　In　this　work,　a　broadband　emitting　Sr8MgGa(PO4)7:Eu2+　(SMGP)　phosphor,　deriving　from　β-Ca3(PO4)2　host　by　cations　substitution,　was　prepared　by　solid　state　reaction　at　high　temperature.　Based　on　the　Rietveld　refinement　results,　SMGP　host　possesses　a　monoclinic　system　with　a　space　group　C2/m.　The　optimized　doping　concentration　was　determined　to　be　0.04.　The　SMGP:　0.04Eu2+　sample　exhibit　strong　absorption　at　the　wavelength　of　250–500 nm,　and　a　broadband　emission　from　450　to　800 nm　covering　the　spectra　from　cyan　to　deep　red.　However,　the　SMGP:　0.04Eu2+　phosphors　exhibit　poor　thermal　stability　with　activation　energy　as　0.156 eV.　By　adjusting　the　composition　of　the　trivalent　ions　Ga3+/Lu3+,　controllable　emission　color　from　green　to　yellow　can　be　achieved　in　the　Sr8MgGa1-xLux(PO4)7:Eu2+　solid　solution　phosphors.　Finally,　a　white　light-emitting　diodes　(LED)　lamp　was　prepared　by　coating　the　mixtures　of　SMGP:　0.04Eu2+　phosphors　and　BaMgAl10O17:Eu2+　phosphors　on　the　surface　of　400 nm　near-ultraviolet　chip.　The　optimized　white　LED　lamp　exhibits　a　correlated　color　temperature　of　2991 K　and　a　good　color　rendering　index　of　90.2.　These　results　demonstrate　the　commercialized　prospect　of　SMGP:　Eu2+　materials　as　a　broadband　emitting　phosphor　for　application　in　solid　state　lighting.　©　2021,　The　Author(s),　under　exclusive　licence　to　Springer-Verlag　GmbH,　DE　part　of　Springer　Nature.