A Novel Efficient Red Emitting Iridium Complex for Polymer Light Emitting Diodes

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2012,（12）
• 页码范围: 211-214
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/29/12/127801

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 618nm 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 3.2mA·cm-2 with a dominant red emission peak around 620nm and a shoulder around 660nm.At 100mA·cm-2,the devices still display a maximum external quantum efficiency as high as 3.9％.