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

7 Citations (Scopus)

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
Pages (from-to)643-644
Number of pages2
JournalSynthetic Metals
Volume84
Issue number1-3
Publication statusPublished - Jan 1997
Externally publishedYes

Fingerprint

Light emitting diodes
Cathodes
light emitting diodes
Derivatives
cathodes
Luminance
Metals
luminance
ITO (semiconductors)
Electrodes
Electrons
Electric potential
injection
electrodes
electric potential
metals
poly(4-phenylenevinylene)
electrons

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Cacialli, F., Friend, R. H., Haylett, N., Daik, R., Feast, W. J., Dos Santos, D. A., & Brédas, J. L. (1997). Efficient green light emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene). Synthetic Metals, 84(1-3), 643-644.

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: Synthetic Metals, Vol. 84, No. 1-3, 01.1997, p. 643-644.

Research output: Contribution to journalArticle

Cacialli, F, Friend, RH, Haylett, N, Daik, R, Feast, WJ, Dos Santos, DA & Brédas, JL 1997, 'Efficient green light emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene)', Synthetic Metals, vol. 84, no. 1-3, pp. 643-644.
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). Synthetic Metals. 1997 Jan;84(1-3):643-644.
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: Synthetic Metals. 1997 ; Vol. 84, No. 1-3. pp. 643-644.
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