| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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A Novel Efficient Red Emitting Iridium Complex for Polymer Light Emitting Diodes |
| HU Zheng-Yong**, YANG Jian-Kui, LUO Jing, LIANG Min, WANG Jing |
Science College, Hunan Agricultural University, Changsha 410128
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| Cite this article: |
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HU Zheng-Yong, YANG Jian-Kui, LUO Jing et al 2012 Chin. Phys. Lett. 29 127801 |
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Abstract 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%.
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Received: 05 June 2012
Published: 04 March 2013
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