A　new　cadmium-rare　earth　(Dy)　oxyborate　Cd4DyO(BO3)(3)　has　been　prepared　by　a　high-temperature　solution　reaction　at　950　degrees　C.　The　compound　crystallizes　in　the　space　group　Cm　with　a　=　7.9549(2)　angstrom,　b　=　15.7792(3)　angstrom,　c　=　3.4738(1)　angstrom,　beta　=　100.183(2)degrees,　V　=　429.166(17)　angstrom(3),　and　Z　=　2.　Its　crystal　structure　consists　of　1D　[Dy2O6](n)(5n-),　nchains　of　edge-sharing　DyO6　octahedra　and　1D　[Cd2O6](n)(8n-)　double　chains　formed　by　corner-　or　edge-sharing　CdO5　and　CdO6　polyhedra.　These　chains　are　held　together　via　common　O　atoms　leading　to　a　3D　[Cd4DyO10](n)(9n),　n　network,　with　B　atoms　residing　in　channels　of　the　network　to　balance　charge,　thus　the　final　3D　network　of　Cd4DyO(BO3)(3)　is　formed.　IR　and　Raman　studies　support　the　presence　of　BO3　groups　in　the　structure.　Solid　solutions　of　Cd4Dy1-xSmxO(BO3)(3)　(0　＜=　x　＜=　0.8)　were　prepared　via　solid-state　reaction　method　and　their　photoluminescence　properties　were　studied.　It　was　found　that　under　near-UV　excitation,　the　luminescence　color　of　Cd4Dy1-xSmxO(BO3)(3)　fluorescent　powders　can　be　tuned　from　yellowish　white　through　white　to　purplish　white　by　rationally　controlling　the　Sm3+/Dy3+　concentration　ratio.　The　Cd4Dy0.8Sm0.2O(BO3)(3)　phosphor　excited　at　364　nm　has　CIE　coordinates　(0.338,0.328)　and　a　CCT　value　of　5240　K,　which　indicates　that　it　has　the　potential　to　be　used　as　a　single-component　while-emitting　phosphor　for　commercial　W-LEDs.　Moreover,　XPS　and　UV-vis　absorption　spectra　of　Cd4DyO(BO3)(3)　have　also　been　investigated.