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Enhanced Electroluminescent Efficiency Based on Functionalized Europium Complexes in Polymer Light-Emitting Diodes |
| ZHANG Yong;WANG Lei;LI Chun;ZENG Wen-Jin;SHI Hua-Hong;CAO Yong |
| Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Special Functional Materials (Ministry of Education), South China University of Technology, Guangzhou 510640 |
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| Cite this article: |
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ZHANG Yong, WANG Lei, LI Chun et al 2007 Chin. Phys. Lett. 24 1376-1379 |
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Abstract Efficient red polymer light-emitting diodes are fabricated with the single active layer from the blends of poly(N-vinylcarbazole) (PVK) in the presence of 30wt.% electron-transporting compound 2-(4-biphenylyl)-5-(p-tert-butylphenyl)-1,3,4-oxadiazole (PBD) and europium complexes. The polyphenylene functionalized europium complex shows an enhanced electroluminescent efficiency due to the large site-isolation effect. For the polyphenylene functionalized europium complex, the maximum external quantum efficiency of 1.90% and luminous efficiency of 2.01cd A-1 are achieved with emission peak at 612nm. The maximum brightness is more than 300cd m-2.
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| Keywords:
78.60.Fi
78.66.Qn
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Received: 18 January 2007
Published: 23 April 2007
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