The complex tris(thenoyltrifluoracetonate)(2,2'-bipyridine)europium(III), Eu(tta)3bipy, was synthesized and assessed for luminescence behavior. The emission of its blends with poly(9-vinyl carbazole) (PVK-Eu), varying in composition from 1 to 8% (Eu(tta)3bipy/PVK, m/m) showed PL at 425 nm and at 613 nm, with intensities which depended on the blend composition. Double-layer LED devices with configuration ITO/PEDOT-PSS/Blend/Ca-Al emitted red light with turn-on voltages of 9 V and emission maxima at 617 nm; its luminance efficiency was 0.04 cd A-1. Time resolved measurements indicated that the microstructure of the matrix had practically no effect on the electro-optical properties of the blends.
europium; PVK; electroluminescence
