A　set　of　novel　red　phosphors　Li8CaLa2Ta2O13:xEu3+　(LCLTO:xEu3+)　were　successfully　prepared　using　a　solid-state　reaction　method.　The　properties　of　the　prepared　samples,　including　phase　purity,　elemental　composition,　and　morphology,　were　systematically　investigated　using　X-ray　diffraction,　scanning　electron　microscopy,　and　diffuse　reflectance　spectroscopy　analyses.　The　610　nm　maximum　emission　peak　is　attributed　to　the　5D0→7F2　transition　of　Eu3+　ion　under　394　nm　irradiation.　Among　all　the　LCLTO:xEu3+　phosphors,　LCLTO:0.6Eu3+　showed　the　strongest　emission　intensity　because　of　the　concentration　quenching　effect　of　the　electric　dipole–dipole　interaction　among　the　Eu3+　ions,　which　was　also　demonstrated　by　the　decay　curves.　Remarkably,　the　emission　intensity　of　the　optimal　LCLTO:0.6Eu3+　phosphor,　which　exhibited　a　high　internal　quantum　efficiency　of　49.30%　and　excellent　color　purity　of　96.79%,　was　approximately　2.29　times　higher　than　that　of　commercial　Y2O3:Eu3+　red　phosphors.　The　thermal　stability　of　the　LCLTO:0.6Eu3+　sample　with　good　color　stability　was　meticulously　investigated.　The　fabricated　white-light-emitting　diode　(WLED)　exhibited　a　superior　color-rendering　index　of　Ra　=　82　and　chromaticity　coordinates　of　(0.3260,　0.3639),　suggesting　that　LCLTO:0.6Eu3+　has　potential　applicability　in　developing　efficient　and　high-quality　WLEDs.　Moreover,　the　prepared　LCLTO:0.6Eu3+/PDMS　composite　film　demonstrated　exceptional　flexural　resistance　and　chemical　stability,　indicating　considerable　promise　for　practical　anti-counterfeiting　applications.　©　2023