Introduction　Amid　the　growing　emphasis　on　energy　conservation　and　environmental　protection,　designing　phosphors　with　multifunctional　applications　has　become　an　urgent　challenge.　The　traditional　approach　of　combining　blue　light-emitting　diode　(LED)　chips　with　yellow　phosphors　to　produce　white　light　suffers　from　drawbacks　such　as　low　color　rendering　index　(CRI)　and　high　color　temperature.　To　address　the　pressing　demands　of　lighting　and　display　technologies,　developing　high-efficiency　red　phosphors　that　can　be　excited　by　near-ultraviolet　(near-UV)　light　is　crucial　for　applications　in　white　LEDs　and　flexible　display　technologies.　Building　upon　the　garnet-like　structure　of　Ca3Zn3(TeO6)2,　a　series　of　CaNaLaZn3(TeO6)2:xEu3+　(CNLZT:xEu3+)　red　phosphors,　capable　of　being　effectively　excited　by　near-UV　light,　were　designed　and　synthesized　using　a　chemical　unit　co-substitution　strategy.　In　this　approach,　the　[Na+−La3+]　ion　pair　replaces　the　[Ca2+−Ca2+]　ions.　This　co-substitution　significantly　enhances　the　luminescence　properties　of　the　CNLZT:0.15Eu3+　sample.　White　LED　devices　fabricated　with　this　material　exhibit　excellent　luminous　performance　and　stability.　Moreover,　the　CNLZT:0.15Eu3+/polydimethylsiloxane　(PDMS)　flexible　film　demonstrates　promising　luminance,　making　it　well-suited　for　applications　in　flexible　display　technologies.　Methods　A　series　of　CNLZT:xEu3+　red　phosphors　were　synthesized　using　a　high-temperature　solid-state　reaction　method.　Raw　materials　were　accurately　weighed　according　to　stoichiometric　ratios　and　thoroughly　ground　in　an　agate　mortar　for　25　min.　The　resulting　mixture　was　loaded　into　alumina　crucibles　and　sintered　for　10　h　in　an　air　atmosphere　at　1323　K.　After　cooling,　the　samples　were　reground　to　obtain　fine　powders.　The　prepared　CNLZT:0.15Eu3+　red　phosphor　was　then　mixed　with　BaMgAl10O17:Eu2+　(BAM:Eu2+,　blue)　and　(Ba,Sr)2SiO4:Eu2+　(BSS:Eu2+,　green)　in　a　specific　mass　ratio.　This　mixture,　along　with　ZWL8820　organic　silicone　gel,　was　applied　to　a　395　nm　near-UV　chip　and　encapsulated　to　fabricate　a　white　LED　device.　Additionally,　a　CNLZT:0.15Eu3+/PDMS　flexible　film　was　prepared　by　combining　the　CNLZT:0.15Eu3+　phosphor　with　PDMS　in　a　predetermined　mass　ratio　and　cutting　it　to　the　desired　size　for　subsequent　testing.　Results　and　discussion　X-ray　diffraction　(XRD)　analysis　and　Rietveld　structural　refinements　reveal　that　substituting　[Ca2+–Ca2+]　ion　pairs　with　[Na+–La3+]　does　not　alter　the　matrix　structure.　The　Eu3+　replace　La3+　in　the　matrix,　causing　lattice　contraction　and　a　slight　shift　in　XRD　diffraction　peaks　toward　higher　angles.　The　main　absorption　peak　at　394　nm　aligns　well　with　the　near-UV　LED　chip.　When　x=0.15,　the　luminescence　intensity　of　the　optimal　sample　CNLZT:0.15Eu3+　reaches　its　maximum,　1.135　times　higher　than　the　commercial　red　phosphor　Y2O3:Eu3+　and　1.908　times　greater　than　the　pre-substitution　Ca3Zn3(TeO6)2:0.12Eu3+.　The　color　purity　is　99.78%,　and　the　CIE　color　coordinates　are　(0.649　2,　0.350　4),　close　to　the　ideal　red　light　point　(0.670,　0.330),　demonstrating　excellent　red　luminescence.　This　confirms　that　the　chemical　unit　co-substitution　strategy　effectively　enhances　luminescence　properties.　At　elevated　temperatures,　the　CNLZT:0.15Eu3+　sample　exhibits　good　color　stability.　The　packaged　white　LED　device　has　a　correlated　color　temperature　(CCT)　of　6414　K　and　a　CRI　(Ra)　of　87.3.　Its　CIE　coordinates　(0.314　9,　0.325　0)　lie　in　the　white　light　region.　Even　after　100　minutes　of　continuous　operation　at　50　mA,　the　white　LED　maintains　stable　performance　and　luminescence.　Furthermore,　the　CNLZT:0.15Eu3+/PDMS　film　remains　intact　and　efficiently　luminescent　after　bending　tests,　demonstrating　potential　for　flexible　display　applications.　Conclusions　A　series　of　CNLZT:xEu3+　red　phosphors,　excitable　by　near-UV　light,　were　synthesized　using　a　high-temperature　solid-state　reaction　method.　By　employing　the　chemical　unit　co-substitution　strategy　of　[Na+−La3+]　replacing　[Ca2+−Ca2+],　the　optimized　doping　concentration　of　Eu3+　in　the　CNLZT　matrix　was　effectively　elevated　to　15%　(in　mole).　The　luminous　intensity　of　the　CNLZT:0.15Eu3+　sample　is　1.908　times　that　of　the　pre-substitution　Ca3Zn3(TeO6)2:0.12Eu3+　sample　and　1.135　times　that　of　the　commercial　Y2O3:Eu3+.　The　color　purity　of　the　CNLZT:0.15Eu3+　sample　is　99.78%,　and　its　color　coordinates　(0.649　2,　0.350　4)　are　close　to　the　ideal　red　point　(0.670,　0.330).　The　chemical　unit　co-substitution　strategy　effectively　regulates　the　luminescent　properties.　Temperature-dependent　fluorescence　spectroscopy　confirms　that　CNLZT:0.15Eu3+　possesses　excellent　color　stability,　with　a　chromaticity　shift　of　only　0.008　52　at　420　K.　The　packaged　white　LED　achieves　CIE　coordinates　of　(0.314　9,　0.325　0)　with　a　CRI　(Ra)　of　87.3,　demonstrating　precise　color　rendering　and　stable　performance　after　100　min　of　continuous　operation　at　50　mA.　Moreover,　the　CNLZT:0.15Eu3+/PDMS　flexible　film　shows　promising　luminance,　making　it　suitable　for　applications　in　flexible　display　technologies.　©　2025　Chinese　Ceramic　Society.　All　rights　reserved.