The　site　occupation　engineering　of　activators　in　the　phosphor　directly　affects　its　luminescence　properties;　thus,　revealing　the　relationship　between　the　site　occupation　and　the　activator　luminescence　is　of　great　significance.　In　this　work,　a　high　efficiency　green　phosphor　Sr8CaLu(PO4)7:　Eu2+　(SCLP:　Eu2+)　was　successfully　constructed　based　on　the　model　of　whitlockite　β-Ca3(PO4)2　host,　and　its　phase　structure,　morphology　features　and　optical　properties　were　systemically　investigated.　The　as-prepared　SCLP:　Eu2+　phosphor　had　a　monoclinic　symmetry　and　a　broad　green　emission　from　420　to　730　nm　with　a　quantum　yield　as　high　as　77%.　The　SCLP　host　offered　five　types　of　Sr2+　ions　sites　for　Eu2+　ions　occupation;　and　the　PL　spectra　were　divided　into　three　sub-peaks　locating　at　501　(19960.08　cm−1),　527　(18975.33　cm−1)　and　566　nm　(17667.84　cm−1),　which　were　proved　to　the　emission　of　Eu2+　ions　at　the　nine-coordinated　Sr(1,　3,　5)O9,　eight-coordinated　Sr(2)O8　and　special　vacant　Sr(4)O6　sites,　respectively.　The　thermal　stability　was　improved　through　the　package　of　SiO2,　and　the　activation　energy　was　enhanced　from　0.1098　to　0.1457　eV.　Eventually,　the　SCLP:　xEu2+　phosphors　were　applied　in　white　light-emitting　diode,　showing　high　color　rendering　index　(Ra　=　94.4　and　R9　=　81.7)　and　moderate　correlated　color　temperature　(CCT　=　4902　K).　This　work　could　help　to　understand　the　mechanism　behind　the　site-controlled　activator　emission　and　offer　some　meaningful　ideas　to　design　a　new　whitlockite　phosphor　with　desirable　spectral　emission　for　application　in　high　quality　lighting　source.　©　2021　Elsevier　Ltd　and　Techna　Group　S.r.l.