Abstract
A carbazole-functionalized bis-β-diketone as ancillary ligand, 1,1'-(9-(heptan-3-yl)-9H-carbazole-3,6-diyl)bis(4,4,4-trifluorobutane-1,3-dione) (H2L), which contains two trifluorinated alkyl groups, has been prepared for the synthesis of two green and red emitting dinuclear Ir(III) complexes with the general formula Ir2(CˆN)4L [CˆN = 3-(pyridine-2-yl)coumarinato (1L) and 2-(1-naphthyl)benzothiazole (2L)]. The photophysical and electrochemical properties and thermal stabilities of two dinuclear Ir(III) complexes were investigated systematically. The results showed that two dinuclear Ir(III) complexes not only exhibit excellent thermal stabilities, but also emit stronger green and red emissions, respectively. Furthermore, based on two dinuclear Ir(III) complexes, the solution-processed organic light-emitting devices have been successfully fabricated, in which the devices fabricated from the green emissive Ir(III) complex exhibited a maximum brightness of 6057 cd/m2 and a maximum luminous efficiencies of 16.39 cd/A and the devices fabricated from the red emissive Ir(III) complex displayed a maximum brightness of 1949 cd/m2 and a maximum luminous efficiencies of 2.52 cd/A.
Published Version
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