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

作者：Hu Zheng-Yong^*; Yang Jian-Kui; Luo Jing; Liang Min; Wang Jing

来源：Chinese Physics Letters, 2012, 29(12): 127801.

DOI：10.1088/0256-307X/29/12/127801

• GREEN ELECTROPHOSPHORESCENCE
• ELECTROLUMINESCENCE
• GUEST

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 300-450nm 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 3.2 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%.

• 出版日期2012-12
• 单位湖南农业大学