The　commercial　applications　of　lead　halide　perovskites　are　limited　by　their　adverse　environmental　hazards　and　intrinsic　instability.　One　promising　strategy　to　mitigate　the　Pb2+　content　is　the　doping　of　X2+　transition　metal　ions　into　cesium　lead　halide　CsPbX3　(where　X　=　Cl,　Br,　I)　perovskite　nanocrystals　(PNCs).　In　this　study,　an　ultrafast　high-power　ultrasonic　synthesis　method　is　employed　to　ensure　uniform　nucleation　and　growth　of　co-doped　(Zn,　Mn):　CsPbCl3　PNCs.　Various　analytical　techniques　are　utilized　to　investigate　the　phase　purity,　microstructure,　chemical　composition,　and　photo-luminescence　properties　of　the　co-doped　PNCs.　Density　functional　theory　(DFT)　calculations　reveal　that　the　significantly　enhanced　optical　performance　of　co-doped　(Zn,　Mn):　CsPbCl3　PNCs　is　primarily　due　to　the　increased　formation　energy　resulting　from　the　successful　incorporation　of　Zn2+　into　Mn-doped　CsPbCl3　PNCs,　without　introducing　new　defect　states.　Additionally,　the　co-doped　(Zn,　Mn):　CsPbCl3　PNCs　exhibit　high　sensitivity　and　selectivity　in　detecting　Cu2+　ions.　Our　findings　propose　a　novel　approach　for　tuning　the　optical　properties　of　co-doped　(Zn,　Mn):　CsPbCl3　PNCs,　highlighting　their　potential　for　applications　in　fluorescence　sensors.　©　2025