Efficient green light emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene)

F. Cacialli*, R. H. Friend, N. Haylett, R. Daik, W. J. Feast, D. A. Dos Santos, Jean-Luc Bredas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We have used polyvinylcarbazole, PVK, in combination with poly(p-phenylenevinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene), PDPV, to fabricate triple-layer light-emitting diodes ITO/PPV/PVK/PDPV/Metal. We report luminances in excess of 1300 cd/m2 with Al cathodes, turn-on voltages of ∼8V in structures 300 nm thick, and internal efficiencies in the range 0.4-0.8 % for Al and Ca cathodes; at least 10 times higher than for single-layer PDPV devices. In addition, the efficiencies for Ca or Al electrodes are only a factor 1.5 different. The improvements over single-layer PDPV devices are interpreted as due to better hole-injection by PPV and to the formation of a hole-barrier at the PPV/PVK interface, which forces a better balance of the electron- and hole-currents.

Original languageEnglish (US)
Pages (from-to)643-644
Number of pages2
JournalSynthetic Metals
Volume84
Issue number1-3
StatePublished - Jan 1 1997

Keywords

  • Efficiency
  • Hole-barrier
  • Light-emitting diodes
  • Poly(p-phenylene vinylene)
  • Polyvinylcarbazole

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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