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

F. Cacialli, R. H. Friend, N. Haylett, Rusli Daik, W. J. Feast, D. A. Dos Santos, J. L. Brédas

Research output: Contribution to journalArticle

57 Citations (Scopus)

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
Pages (from-to)3794-3796
Number of pages3
JournalApplied Physics Letters
Volume69
Issue number25
Publication statusPublished - 16 Dec 1996
Externally publishedYes

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light emitting diodes
cathodes
luminance
indium oxides
tin oxides
quantum efficiency
anodes
injection
electrodes
electric potential
metals
electrons

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Cacialli, F., Friend, R. H., Haylett, N., Daik, R., Feast, W. J., Dos Santos, D. A., & Brédas, J. L. (1996). Efficient green light-emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene). Applied Physics Letters, 69(25), 3794-3796.

Efficient green light-emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene). / Cacialli, F.; Friend, R. H.; Haylett, N.; Daik, Rusli; Feast, W. J.; Dos Santos, D. A.; Brédas, J. L.

In: Applied Physics Letters, Vol. 69, No. 25, 16.12.1996, p. 3794-3796.

Research output: Contribution to journalArticle

Cacialli, F, Friend, RH, Haylett, N, Daik, R, Feast, WJ, Dos Santos, DA & Brédas, JL 1996, 'Efficient green light-emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene)', Applied Physics Letters, vol. 69, no. 25, pp. 3794-3796.
Cacialli F, Friend RH, Haylett N, Daik R, Feast WJ, Dos Santos DA et al. Efficient green light-emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene). Applied Physics Letters. 1996 Dec 16;69(25):3794-3796.
Cacialli, F. ; Friend, R. H. ; Haylett, N. ; Daik, Rusli ; Feast, W. J. ; Dos Santos, D. A. ; Brédas, J. L. / Efficient green light-emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene). In: Applied Physics Letters. 1996 ; Vol. 69, No. 25. pp. 3794-3796.
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