摘要
Photo-physical properties of iridium complexes bis(1-(2',4'-difluorobiphenyl-4-yl)isoquinoline)iridium(Ⅲ)(5-(4-(bis(4-methoxyphenyl)amino)phenyl)picolinic acid)used as phosphorescent dopant in polymer light-emitting devices with a blend of poly(9,9-dioctylfluorene)and 2-tert-butyl-phenyl-5-biphenyl-1,3,4-oxadiazole as a host matrix are investigated.The iridium complex exhibits distinct UV-vis absorption bands around 300-450 nm and intense red photoluminescent emissions peaked at around 618 nm in dichloromethane.The devices display a maximum external quantum efficiency of 4.8%and luminous efficiency of 3.1 cd·A^(-1) at current density of 3.2 mA·cm^(-2) with a dominant red emission peak around 620 nm and a shoulder around 660 nm.At 100 mA·cm^(-2),the devices still display a maximum external quantum efficiency as high as 3.9%.
基金
Supported by the Science and Technology Program of Educatioal Committee of Hunan Province under Grant No 10C0818.
