Two　novel　phosphors　LiBa4(1-x)Eu4xTa3O12　(H-LBTO:xEu(3+))　and　Li0.25Ba1-xEuxTa0.75O3　(C-LBTO:xEu(3+))　were　prepared　successfully　by　a　molten　salt　method.　The　transformation　between　these　two　structures　was　realized　by　changing　the　sintering　temperature　or　changing　the　Eu3+　ions　concentration,　which　was　also　demonstrated　by　the　X-ray　diffraction　(XRD),　scanning　electron　microscopy　(SEM),　diffuse　reflectance　spectra　(DRS),　and　photoluminescence　excitation　(PLE)　analyses.　Both　the　sintering　temperature　and　the　Eu3+　ions　doping　concentration　have　significant　impact　on　the　formation　of　the　crystal　phase.　All　these　phosphors　sintered　at　1023　K　exhibit　two　major　luminescence　lines　at　594　and　614　nm　under　near-UV　light　of　395　nm　excitation,　corresponding　to　Eu3+　ions　typical　transitions　of　D-5(0)-＞　F-7(1)　and　D-5(0)-＞　F-7(2).　The　optimum　concentration　of　Eu3+　ions　is　9　mol%　for　C-LBTO:xEu(3+)　samples　and　the　quenching　interaction　type　is　the　nearest-neighbor　ion　interaction.　The　thermal　stability　of　the　C-LBTO:0.09Eu(3+)　sample　was　investigated　in　detail　and　the　device　application　further　suggests　that　C-LBTO:0.09Eu(3+)　can　be　used　as　a　red　phosphor　for　near-UV　excited　w-LEDs　in　lighting.　(c)　2023　Chinese　Society　of　Rare　Earths.　Published　by　Elsevier　B.V.　All　rights　are　reserved,　including　those　for　text　and　data　mining,　AI　training,　and　similar　technologies.