High-electric-field quantum yield roll-off in efficient europium chelates-based light-emitting diodes (Articolo in rivista)

Type
Label
  • High-electric-field quantum yield roll-off in efficient europium chelates-based light-emitting diodes (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.1948512 (literal)
Alternative label
  • J. Kalinowski, W. Stampor, M. Cocchi, D. Virgili, V. Fattori (2005)
    High-electric-field quantum yield roll-off in efficient europium chelates-based light-emitting diodes
    in Applied physics letters
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • J. Kalinowski, W. Stampor, M. Cocchi, D. Virgili, V. Fattori (literal)
Pagina inizio
  • 241106 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 86 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 24 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • J. Kalinowski, W. Stampor; Gdansk Tech Univ, Dept Mol Phys, PL-80952 Gdansk, Poland - M. Cocchi, D. Virgili, V. Fattori; CNR ISOF, I-40129 Bologna, Italy (literal)
Titolo
  • High-electric-field quantum yield roll-off in efficient europium chelates-based light-emitting diodes (literal)
Abstract
  • The europium chelates-based light-emitting-diodes (LEDs) have been fabricated showing the maximum electroluminescence (EL) quantum efficiency (QE) up to 5% photons/carrier at electric fields slightly below F=1 MV/cm and current density j congruent to 0.01 mA/cm(2). Their line-like emission QE drops, however, rapidly within the high drive voltage range. This roll-off effect, exceeding one order of magnitude at F congruent to 1.6 MV/cm (j congruent to 15 mA/cm(2)), is shown to be underlain by the electric field-assisted dissociation of electron-hole pair precursors of europium ion-localized emissive states. The high field dependence of EL QE fits the Onsager model of geminate recombination well. This is at variance with triplet-triplet annihilation mechanism assumed previously to reduce QE in such LEDs. (literal)
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