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Enhanced Green Electrophosphorescence from Oxadiazole-Functionalized Iridium Complex-Doped Devices Using Poly(9,9-Dioctylfluorene) Instead of Poly(N-Vinylcarbazole) as a Host Matrix |
LUO Cui-Ping1;ZHOU Ji1;WANG Lei2;Deng Ji-Yong1;QIN Zhi-Jun1,
ZHU Mei-Xiang1;ZHU Wei-Guo 1,3 |
| 1College of Chemistry, Xiangtan University, Xiangtan 4111052IPOMD, South China University of Technology, Guangzhou 5106403Key Laboratory of Low-Dimensional Materials and Application Technology (Ministry of Education), Xiangtan University, Xiangtan 411105 |
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| Cite this article: |
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LUO Cui-Ping, ZHOU Ji, WANG Lei et al 2007 Chin. Phys. Lett. 24 1386-1389 |
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Abstract Optoelectronic properties of the oxadiazole-functionalized iridium complex-doped polymer light-emitting devices (PLEDs) are demonstrated with two different polymeric host matrices at the dopant concentrations 1--8%. The devices using a blend of poly(9,9-dioctylfluorene)(PFO) and 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) as a host matrix exhibited a maximum luminance efficiency of 11.3cd/A at 17.6mA/cm2. In contrast, the devices using a blend of poly(N-vinylcarbazole) (PVK) and PBD as a host matrix reveal only a peak luminance efficiency of 6.5cd/A at 4.1mA/cm2. The
significantly enhanced electrophosphorescent emissions are observed in the devices with the PFO-PBD blend as a host matrix. This indicates that choice of polymers in the host matrices is crucial to achieve highly efficient phosphorescent dye-doped PLEDs.
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| Keywords:
78.60.Fi
78.66.Qn
85.06.Jb
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Received: 06 October 2006
Published: 23 April 2007
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