Photoluminescence and electroluminescence of cationic PtAu2 heterotrinuclear complexes with aromatic acetylides

摘要: Cationic PtAu2 heterotrinuclear complexes [PtAu2(dpmp)2(C[triple bond, length as m-dash]CR)2]2+ (dpmp = bis(diphenylphosphinomethyl)phenylphosphine, R aryl) of aromatic acetylides were prepared. The structures are supported through doubly bridging dpmp and stabilized by a significant Pt-Au interaction. They highly phosphorescent in fluid CH2Cl2 solution (Φem 23.5%-78.9%), the solid state 15.4%-70.2%), PMMA film 39.9%-71.7%) doping 61% TCTA : 31% OXD-7 : 8% complex 16.9%-67.9%). phosphorescence arises mainly from 3[π (C[triple m-dash]CR) → π* (dpmp)] 3LLCT s/p (PtAu2)] 3LMCT triplet excited states for carbazole-acetylide complexes, whereas other display character mixed with noticeable centered 3[d s/p] parentage. Utilizing host composed hole-transporting TCTA electron-transporting OXD-7 doped 8% species light-emitting layer CuSCN an orthogonal process, devices exhibit efficient electrophosphorescence highest current efficiency (CEmax) 51.7 cd A-1 external quantum (EQEmax) 14.5%. roll-off is small practical brightness range 500-5000 m-2. carbazole-acetylides higher electroluminescence ascribed to their better well more facile energy transfer materials.