Two　new　alkali-earth　and　rare-earth　metal　borates,　Sr2Tb3B27-delta　O46　and　Ba2Eu3B27-delta　O46　(delta　=　2/3),　have　been　prepared　by　high-temperature　solution　reactions　at　950　degrees　C.　The　single-crystal　XRD　analysis　showed　that　the　borates　crystallize　in　the　rhombohedral　space　group　R3　with　the　cell　parameters　a　=　7.7468(1)　angstrom,　c　=　46.3657(5)　angstrom,　V　=　2409.75(3)　angstrom(3),　Z　=　3　and　a　=　7.7964(1)　angstrom,　c　=　46.5086(6)　angstrom,　V　=　2448.23(7)　angstrom(3),　Z　=　3,　respectively,　which　further　confirms　that　＂LnMB(9)O(16)＂　has　the　right　formula　of　M(2)Ln(3)B(27-delta)O(46)　(delta　=　2/3).　Their　crystal　structures　consist　of　3D　networks　constructed　by　Tb(Eu)O-6　trigonal　prisms,　BO3　planar　triangles,　and　BO4　tetrahedra,　with　large　cavities　accommodating　Sr2+　(Ba2+)　cations.　Furthermore,　the　phase　composition,　morphology,　IR,　Raman,　and　XPS　spectra　as　well　as　photoluminescence　properties　of　these　two　compounds　were　studied.　Upon　excitation　by　ultraviolet　radiation,　Sr2Tb3B27-delta　O46　exhibits　the　characteristic　emission　lines　originating　from　Tb3+　corresponding　to　D-5(4)-F-7(6,5,4,3,2,1,0)　transitions,　whereas　Ba2Eu3B27-delta　O46　displays　bright　red　emission　from　Eu3+　with　four　groups　of　emission　bands　associated　with　D-5(0)　-＞　F-7(1,2,3,4)　transitions.　Both　phosphors　show　stable　luminescence　and　color　purity　at　elevated　temperatures.　As　it　may　be　expected,　Sr2Tb3B27-delta　O46　and　Ba2Eu3B27-delta　O46　(delta　=　2/3)　are　promising　green　(Tb)　and　red　(Eu)　components　for　use　in　WLEDs.