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Red Electrophosphorescence from Oxadiazoles-Functionalized Iridium Complexes in Polymer Light-Emitting Devices |
| WU Zhong-Lian1,2;LUO Cui-Ping1;HU Zheng-Yong1;JIANG Chang-Yun2;HUANG Feng-Liang1;ZHU Ke-Ming1;ZHU Mei-Xiang1,
ZHU Wei-Guo1 |
| 1College of Chemistry, Xiangtan University, Xiangtan 411105
2IPOMD, South China University of Technology, Guangzhou 510640 |
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| Cite this article: |
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WU Zhong-Lian, LUO Cui-Ping, HU Zheng-Yong et al 2006 Chin. Phys. Lett. 23 3091-3093 |
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Abstract A type of oxadiazole-functionalized iridium complex is newly employed as red phosphor emitter in polymer light-emitting devices (PLEDs) using a blend of poly (9,9-dioctylfluorene)(PFO) and 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole (PBD) as a host matrix. The devices show bright red electrophosphorescence with dominant peaks at about 593nm and shoulders at about 642nm. The highest luminance efficiency of 3.3cd/A at 9.3V and maximum luminance of 2912cd/m2 at 14.0V are achieved in the devices. At current density of 100mA/cm2, the devices still exhibit luminance efficiency of 2.2cd/A and luminance of 2300cd/m2. This indicates that the oxadiazole-functionalized iridium complexes have improved optoelectronic properties in the devices at high current density.
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| Keywords:
78.60.Fi
78.66.Qn
85.06.Jb
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Published: 01 November 2006
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