Metal　halides　can　produce　a　broadband　emission　spectrum　of　self-trapped　excitons　(STEs)　with　a　large　stokes　shift　because　they　have　strong　electron-phonon　coupling　and　soft　lattice.　In　this　study,　CsCdCl3:xSb3+　perovskite　microcrystals　were　prepared　using　a　simple　co-precipitation　strategy　at　room-temperature.　Their　composition,　morphology　and　phase　structure　were　characterized　by　EDS,　XPS,　SEM　and　XRD.　The　result　showed　that　the　structure　of　the　CsCdCl3:xSb3+　perovskite　microcrystals　was　hexagonal.　In　terms　of　luminescence,　the　un-doped　CsCdCl3　sample　showed　a　quite　broadband　emission　from　the　host　STEs　with　a　large　Stokes　shift　of　340　nm.　The　PLE　and　PL　of　the　CsCdCl3:0.007Sb3+　sample　show　two　absorptions　at　the　wavelength　of　300　and　355　nm,　which　is　because　of　the　1S0　→　1P1　and　1S0　→　3P1　transitions　of　Sb3+　ions　and　the　enhanced　cyan　emission　from　STEs　emission　of　[SbCl6]　octahedra　induced　by　a　heterovalent　doping　strategy,　respectively.　In　addition,　in　the　PL　spectra,　there　are　two　luminescence　centers　in　the　CsCdCl3:xSb3+　samples.　The　emission　peak　at　500　nm　is　higher　than　that　at　600　nm,　which　can　be　attributed　to　the　STEs　of　[SbCl6]　and　the　two　face-sharing　octahedra　[Sb2Cl9],　respectively.　The　formation　of　STEs　can　be　demonstrated　by　the　large　S　value.　The　CsCdCl3:xSb3+　samples　undergo　two　thermal　processes,　with　an　activation　energy　of　127　meV　(Ea2)　at　a　high　temperature　and　101　meV　(Ea1)　at　a　low　temperature.　Finally,　they　have　good　thermal　and　anti-water　stability,　and　thus　can　be　possibly　applied　in　white　LED　with　CIE　color　coordinates　of　0.4119　and　0.3897,　the　CCT　of　3227　K　and　CRI　of　79.3.　©　2022　Elsevier　Ltd　and　Techna　Group　S.r.l.