Dinuclear cyclometalated iridium (III) complex containing functionalized triphenylamine core: synthesis, photophysics and application in the single-emissive-layer WOLEDs. Issue 45 (10th November 2016) - He, Keqi
Abstract: To obtain highly efficient white-emitting devices, a novel functionalized dinuclear iridium (III) complex of C8 TPA(FIrpic)2 was successfully synthesized and characterized. In this phosphor, FIrpic is a blue-emitting phosphorescent chromophore of iridium(III) bis[(4, 6-difluorophenyl)pyridinato-N, C2′] picolate and C8 TPA is a blue-emitting fluorescent chromophore of triphenylamine as bridging donor. Its optophysical and electro-phosphorescent properties were primarily investigated. White emission with an increasing current efficiency of 1.31 cd/A at 15.3 mA/cm 2 and brightness of 1770 cd/m 2 at 656.3 mA/cm 2 was obtained in its single-emissive-layer OLEDs with a configuration of ITO/PEDOT:PSS/C8 TPA(FIrpic)2 (10 wt %):TCTA/TPBi/LiF/Al. The results indicate that an introduction of triphenylamine group into dinuclear iridium (III) complexes as bridged donor can improve the performance of its iridium (III) complexes-doped OLEDs. Graphical abstract: A novel triphenylamine-functionalized dinuclear iridium (III) complex of C8 TPA(FIrpic)2 was synthesized and characterized. White emission with a rising brightness of 1770 cd/m 2 and current efficiency of 1.31 cd/A was obtained in the single-emissive-layer OLEDs with a configuration of ITO/PEDOT:PSS/C8 TPA(FIrpic)2 (10 wt %):TCTA/TPBi/LiF/Al using C8 TPA(FIrpic)2 as a single-component emitter.