Herein,　we　present　a　new　strategy　in　which　highly　emissive　thermally　activated　delayed　fluorescence　(TADF)　materials　can　be　obtained　from　modifying　or　tuning　a　non-TADF　donor　(D)-acceptor　(A)-type　organic　molecule　via　coordination　of　the　metal　ionic　fragment.　Theoretical　calculation　and　photophysical　properties　reveal　that　the　D-A-type　free　ligand　emits　both　weak　fluorescence　and　dual　roomerature　phosphorescence,　whereas　the　two　Ag(I)　complexes　display　efficient　blue　TADF,　exhibiting　photoluminescence　quantum　yields　nearly　100%　in　films　with　short　decay　lifetimes　(τ　≈　6　μs).　This　is　attributed　to　the　four　optimized　parameters　induced　by　Ag(I)　coordination:　(1)　narrow　singlet　(S1)-triplet　(T1)　energy　gaps　(Î＇EST).　(2)　T1　states　have　a　hybrid　local　excitation　and　charge　transfer　(CT)　character,　and　S1　states　have　a　predominant　CT　character.　Both　the　parameters　facilitate　reverse　intersystem　crossing.　(3)　Radiative　rate　constant　(kr(S1→S0))　is　increased.　(4)　Molecular　rigidity　is　strengthened.　For　the　first　time,　this　work　shows　a　powerful　method　to　design　efficient　ligand-centered　TADF　in　Ag(I)　complexes　based　on　the　conventional　D-A-type　molecule,　which　significantly　enriches　the　chemical　space　for　the　development　of　TADF　materials.　©　2019　American　Chemical　Society.