Dinuclear platinum(Ⅱ)complexes of a new,ditopic,bis-tridentate NCN-NCN-coordinating ligand,appended with four mesityl groups,are reported.The high radiative rate constants and correspondingly efficient luminescence o...Dinuclear platinum(Ⅱ)complexes of a new,ditopic,bis-tridentate NCN-NCN-coordinating ligand,appended with four mesityl groups,are reported.The high radiative rate constants and correspondingly efficient luminescence of the complexes involves thermally activated delayed fluorescence(TADF),thanks to a near-zero energy gap between the S_(1) and T_(1) states.The mesityl groups also serve to hinder the aggregation that was detrimental to electroluminescence efficiency in previous studies,allowing a~4-fold increase in OLED efficiency to be achieved(i.e.from 2.3% previously to 10% in this work).Oxidation of one of the Pt(Ⅱ)complexes led to a dinuclear Pt(Ⅳ)complex of unprecedented structure.展开更多
基金the National Science Centre,Poland for funding under grant no.2022/47/D/ST4/01496the Rector’s pro-quality grant,Silesian University of Technology,Poland,grant no:04/040/RGJ24/0279+1 种基金funding from EPRSC(grant ref.EP/S012788/1)Durham University Chemistry for partial support of a PhD studentship.
文摘Dinuclear platinum(Ⅱ)complexes of a new,ditopic,bis-tridentate NCN-NCN-coordinating ligand,appended with four mesityl groups,are reported.The high radiative rate constants and correspondingly efficient luminescence of the complexes involves thermally activated delayed fluorescence(TADF),thanks to a near-zero energy gap between the S_(1) and T_(1) states.The mesityl groups also serve to hinder the aggregation that was detrimental to electroluminescence efficiency in previous studies,allowing a~4-fold increase in OLED efficiency to be achieved(i.e.from 2.3% previously to 10% in this work).Oxidation of one of the Pt(Ⅱ)complexes led to a dinuclear Pt(Ⅳ)complex of unprecedented structure.
