Photo- and electroluminescent behavior of Eu3+ ions in blends with poly(vinyl-carbazole)

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2007-01-01
Deichmann, V. A. F.
Novo, J. B. M.
Çırpan, Ali
Karasz, F. E.
Akcelrud, L.
The complex tris(thenoyltrifluoracetonate)(2,2'-bipyridine) europium(III), Eu(tta)(3)bipy, 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)(3)bipy/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 9V 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.