Synthesis and optoelectronic properties of novel fluorene-bridged dinuclear cyclometalated iridium (III) complex with A-D-A framework in the single-emissive-layer WOLEDs

Novel fluorene-bridged dinuclear cyclometalated Ir (III) complex of (dfppy)4Ir2(dipic-FL) was synthesized for a single component white emission material. White emission was obtained in single-emissive-layer device with the configuration of ITO/PEDOT:PSS/(dfppy)4Ir2(dipic-FL):TCTA (10 wt%)/TPBi/LiF/Al. The devices revealed a maximum luminance of 1040 cd/m2 and current efficiency of 1.2 cd/A.171