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

57 Scopus citations

Abstract

We have used polyvinylcarbazole, PVK, in combination with poly(p-phenylene vinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene) or briefly PDPV, to fabricate triple-layer light-emitting diodes PPV/PVK/PDPV/metal, with indium tin oxide as the anode. We report luminances in excess of 1300 cd/m2 with Al cathodes, turn-on voltages of ∼8 V in structures 300 nm thick, and internal efficiencies in the range 0.4%-0.8% for Al and Ca cathodes; at least ten times higher than for single-layer PDPV devices. Quantum efficiencies for Ca or Al electrodes are only a factor 1.5 different. The improvements over single-layer PDPV devices are considered to be 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)3794-3796
Number of pages3
JournalApplied Physics Letters
Volume69
Issue number25
DOIs
StatePublished - Dec 16 1996

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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