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20 November 2007 Synthesis, characterization, and electroluminescent properties of a new rare earth europium complex
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This Electroluminescence(EL) of organic materials has been known since the 1960s. Resulting devices are commonly called "organic light-emitting diodes" (OLED). Organic light-emitting devices have attracted much attention owing to their potential application for flat-panel displays. Rare earth complexes containing β-diketonate ligands have attracted very much attention, because their special properties in organic light-emitting diodes, like narrow emission bands and nearly 100% quantum efficiency in theory. How to improve their efficiency and stability are important problems which people study. Thin film OLEDs usually consist of multiple organic and metallic layers on an ITO-covered glass plate. In this paper, a novel Europium Complex , Eu(DBM)3L[L= 4,4'-bis(4-methyphenyl-1,3,4-oxadiazole)-2,2'-bipyridine] functionalized by a carbozole fragment, was synthesized and used as emitting material in organic electroluminescent (EL) devices. Their absorption spectrum , luminescence properties were studied. The light-emitting units were based on 4,4'-bipyridine and oxadiazole derivatives. It was found that the EL performance based on lanthanide complex can be effectively improved by chemical modification on the second ligand.
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Fan Wei, Baoshan Wang, Binbin Wang, Bin Li, and Demin Xie "Synthesis, characterization, and electroluminescent properties of a new rare earth europium complex", Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 68280E (20 November 2007);

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