The　development　of　a　single-ion　activated　single-phased　white-light　phosphor　is　of　great　importance　in　the　field　of　near　ultraviolet　based　w-LED　lighting.　In　this　work,　a　Ba2Y3(SiO4)(3)F:　Eu　fluoride　apatite,　which　shows　a　broad　emission　band　covering　the　entire　visible　region　with　tunable　color　rendition,　was　successfully　synthesized　via　a　high-temperature　solid-state　route.　The　microstructure　and　composition　of　the　phosphor　were　carefully　examined　with　the　aid　of　XRD　Rietveld　refinement,　HRTEM　and　SEM　analyses,　as　well　as　XPS　measurement.　Spectroscopic　studies　revealed　the　site　occupancy　conditions　of　Eu2+,　i.　e.,　the　Eu2+(I)　band　centering　at　470　nm　originates　from　the　[BaO9]　4f　site,　while　the　Eu2+(II)　one　peaking　at　600　nm　comes　from　the　[BaO6F]　6h　site.　Interestingly,　the　obtained　white　light　can　be　readily　tuned　from　cool　to　warm　just　by　varying　the　Eu　doping　content.　The　brightest　luminescence　was　achieved　when　the　Eu　concentration　reached　1　mol%,　beyond　which　the　d-d　interaction-based　energy　transfer　between　Eu2+　ions　would　result　in　concentration　quenching.　The　underlying　mechanism　of　the　incomplete　conversion　from　Eu3+　to　Eu2+　under　a　reducing　atmosphere　was　explored,　which　was　believed　to　be　caused　by　the　rigid　framework　of　the　crystal　structure.　After　coupling　Ba2Y3(SiO4)(3)F:　Eu　with　a　commercial　3W　370　nm　UV　chip,　the　constructed　w-LED　yielded　warm　white　light　with　a　CIE　coordinate　of　(0.402,　0.371),　CCT　of　3530　K,　and　CRI　of　83.5,　upon　being　driven　by　a　350　mA　forward-biased　current.