Red polymer electrophosphorescent devices based on iridium complex with reduced self-quenching effect

A highly efficient red-emitting phosphorescent polymer light-emitting diode(Ph-PLED) with a new iridium complex of bis(2-benzo[b]thiophen-2-yl-5-trifluoromethyl-pyridinato-N,C3) iridium(Ⅲ)(acetylacetonate) [(btfmp)2Ir(acac)] using poly(n-vinylcarbazole)(PVK) as host material was demonstrated.The PLED offers a maximum external quantum efficiency of 4.5% with an emission peak of 648 nm.The CIE coordinates are(0.71,0.29) and independent from driving current density,indicating an efficient reduction of self-quenching effect at high doping concentrations.