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

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Deichmann V. A. F., Novo J. B. M., Cirpan A., Karasz F. E., Akcelrud L.

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY, vol.18, no.2, pp.330-336, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 18 Issue: 2
  • Publication Date: 2007
  • Doi Number: 10.1590/s0103-50532007000200013
  • Journal Name: JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.330-336
  • Keywords: europium, PVK, electroluminescence, ENERGY-TRANSFER, EUROPIUM COMPLEX, LUMINESCENCE, EMISSION, COPOLYMERS, POLYMER
  • Middle East Technical University Affiliated: No

Abstract

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.