Thermally　activated　delayed　fluorescence　(TADF)　materials　have　attracted　significant　attention　in　the　field　of　organic　light-emitting　diodes　(OLEDs)　due　to　their　tremendous　application　potential.　The　outermost　electronic　configuration　of　the　Ag(I)　complex　is　d10　configuration,　with　d　orbitals　always　being　filled.　There　is　no　metal-centred　(MC)　state,　therefore　the　quenching　effect　caused　by　the　MC　state　does　not　occur.　This　renders　it　an　appropriate　choice　for　the　design　and　development　of　TADF　materials.　In　this　study,　we　designed　and　synthesized　a　novel　D-A　ligand,　9-(4＇-(4,6-diphenyl-1,3,5-triazin-2-yl)-4-(3-(pyridin-2-yl)-1H-pyrazole-1-yl)-[1,1＇-biphenyl]-2-yl)-3,6-dimethoxy-9H-carbazole　(L).　The　ligand　employs　3,6-dimeth-oxy-9H-carbazole　as　the　electron　donor　and　comprises　a　bis-electron-donating　group　comprising　triazine　and　pyridyl　pyrazole　as　the　electron　acceptor.　An　ionic　Ag(I)　complex,　Ag(L)(POP)(BF4)　(1),　was　synthesised　utilising　L　as　a　nitrogen-containing　bidentate　ligand　and　bis[2-(diphenylphosphino)phenyl]　ether　(POP)　as　a　phosphorus-containing　bidentate　ligand.　The　ligand　L　and　complex　1　were　characterised　by　1H　and　13C　nuclear　magnetic　resonance　spectrometry,　elemental　analysis　and　X-ray　single　crystal　diffraction　analysis.　The　complex　1　belongs　to　the　triclinic　crystal　system　with　space　group　P-1,　with　a＝1.30213(4)　nm,　b＝1.63383(4)　nm,　and　c＝1.93108(5)　nm,　α＝92.941(2)°,　β＝105.247(3)°,　γ＝98.591(2)°,　V＝3.90076(18)　nm3.　The　Ag+　ion　in　complex　1　is　tetrahedrally　coordinated　with　a　twisted　tetrahedral　coordination　geometry.　At　room　temperature,　complex　1　in　solid　form　emits　strong　green　light　under　UV　light,　with　a　maximum　at　490　nm.　The　fluorescence　lifetime　is　23.0　ns,　the　thermally　activated　delayed　fluorescence　(TADF)　lifetime　is　503.9　μs,　and　the　photoluminescence　quantum　yield　(PLQY)　is　43.8%.　The　steady-state　emission　spectra　and　time-dependent　photoluminescent　spectra　of　complex　1　at　different　temperatures　demonstrate　that　complex　1　exhibits　TADF　characteristics　at　room　temperature.　©　2024　Shanghai　Institute　of　Organic　Chemistry,　Chinese　Academy　of　Sciences.