In this work,4-substituted phenylacetylides with electron-rich N,N’-diarylamine groups are used for the design of triphosphine-supported PtAu_(2) complexes with red phosphorescence.Although PtAu_(2) complex 1 with 4-...In this work,4-substituted phenylacetylides with electron-rich N,N’-diarylamine groups are used for the design of triphosphine-supported PtAu_(2) complexes with red phosphorescence.Although PtAu_(2) complex 1 with 4-ethynyl-N,N’-diphenylaniline displays orange emission in CH_(2)Cl_(2) solution,highly efficient red phosphorescence is attained upon using 5-ethynyl-N,N’-diphenylthiophen-2-amine(2)or 2-ethynyl-4-phenyl-4H-dithieno[3,2-b:2’,3’-d]pyrrole(3)in place of 4-ethynyl-N,N-diphenylaniline(1).In contrast to the intense phosphorescence of complexes 1 and 3 in degassed CH_(2)Cl_(2) solution at ambient temperature,complex 2 shows a quite weak phosphorescence as well as fluorescence of the acetylide ligand due to incomplete energy transfer from acetylide ligands to PtAu_(2) centres.Since the phosphorescence efficiency of the doping films is as high as 98.3%,complexes 1–3 are excellent phosphorescent dopants in organic light-emitting diodes(OLEDs).Solution-processed OLEDs showed high-efficiency yellow emission for complex 1(λ_(EL)=567 nm),whereas orange-red phosphorescence for 2(λ_(EL)=624 nm)and deep red emission for 3(λ_(EL)=625 nm)with a peak external quantum efficiency of 16.5%,8.4%and 13.6%,respectively.展开更多
基金support from the National Natural Science Foundation of China(Grants 92061202 and 21801242)the Fujian Science and Technology Project(Grant 2020L3022)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant XDB20000000).
文摘In this work,4-substituted phenylacetylides with electron-rich N,N’-diarylamine groups are used for the design of triphosphine-supported PtAu_(2) complexes with red phosphorescence.Although PtAu_(2) complex 1 with 4-ethynyl-N,N’-diphenylaniline displays orange emission in CH_(2)Cl_(2) solution,highly efficient red phosphorescence is attained upon using 5-ethynyl-N,N’-diphenylthiophen-2-amine(2)or 2-ethynyl-4-phenyl-4H-dithieno[3,2-b:2’,3’-d]pyrrole(3)in place of 4-ethynyl-N,N-diphenylaniline(1).In contrast to the intense phosphorescence of complexes 1 and 3 in degassed CH_(2)Cl_(2) solution at ambient temperature,complex 2 shows a quite weak phosphorescence as well as fluorescence of the acetylide ligand due to incomplete energy transfer from acetylide ligands to PtAu_(2) centres.Since the phosphorescence efficiency of the doping films is as high as 98.3%,complexes 1–3 are excellent phosphorescent dopants in organic light-emitting diodes(OLEDs).Solution-processed OLEDs showed high-efficiency yellow emission for complex 1(λ_(EL)=567 nm),whereas orange-red phosphorescence for 2(λ_(EL)=624 nm)and deep red emission for 3(λ_(EL)=625 nm)with a peak external quantum efficiency of 16.5%,8.4%and 13.6%,respectively.
