Here　we　designed　and　synthesized　the　red　NaxCa1−2xMoO4:Eux3+　phosphors　with　fluorescence　enhancement　via　high　temperature　solid　state　reaction.　Phase　purity　analysis,　which　had　been　checked　by　the　X-ray　powder　diffraction　(XRD),　showed　that　all　the　obtained　samples　crystallized　in　a　scheelite　structure　with　the　space　group　of　I41/a　(No.　88).　In　these　samples,　we　found　that　increasing　the　x　value　enabled　shifting　the　XRD　position　to　the　low　angle　direction.　For　the　photoluminescence　(PL)　properties,　the　charge　transfer　(CT)　band　as　the　x　value　increases　exhibited　an　initial　intensity　increase　followed　by　a　subsequent　decrease,　and　the　optimal　x　value　for　the　maximum　CT　band　intensity　was　experimentally　found　to　be　0.25.　In　sharp　difference,　directly　exciting　at　the　excitations　of　Eu3+,　viz.　393　and　464 nm,　allowed　the　Eu3+　emission　to　constantly　increase　the　emission　intensity.　In　order　to　further　enhance　the　red　fluorescence　intensity,　the　WO3　was　selected　to　co-dope　into　the　NaxCa1−2xMoO4:Eux3+　(x　=　0.5)　sample　in　order　to　form　the　Na0.50(MoO4)1−y(WO4)y:Eu0.503+　solid　solution　compounds.　Upon　excitation　at　393　and　464 nm,　the　y　value　that　corresponded　to　optimal　Eu3+　fluorescence　intensity　was　found　to　be　0.5.　To　illustrate　our　experimental　observations,　feasible　mechanism　profile　was　also　given　in　this　work.　Our　results　have　demonstrated　that　the　Eu3+　fluorescence　in　CaMoO4　matrix　could　be　enhanced　by　using　the　charge　compensation　and　at　the　same　time　the　WO3,　which　provided　new　insight　into　enhancing　Eu3+　doped　crystals　for　ultraviolet　converted　white-LEDs.　©　2017,　Springer　Science+Business　Media　New　York.