Effect of poly(3,4-ethylene dioxythiophene) on the built-in field in polymer light-emitting diodes probed by electroabsorption spectroscopy

T. M. Brown, J. S. Kim, R. H. Friend, F. Cacialli, Rusli Daik, W. J. Feast

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Here we report electroabsorption (EA) measurements on light-emitting diodes (LEDs), fabricated with poly(4,4′-diphenylene diphenylvinylene) (PDPV) as the emissive layer in indium-tin oxide (ITO)/poly(3,4-ethylene dioxythiophene) (PEDOT):polystyrene sulfonic acid (PSS)/PDPV/Ca-Al and ITO/PDPV/Ca-Al structures. In the latter structure, the built-in potential, determined from nulling the EA signal, corresponds to the difference between the work functions of the electrodes. By incorporating a PEDOT:PSS film between the ITO electrode and the emissive layer we find that such a built-in voltage increases by 0.5 V. The correspondent lowering of the anodic barrier height at the PDPV interface is likely to be responsible for the improvement in device performance.

Original languageEnglish
Pages (from-to)285-287
Number of pages3
JournalSynthetic Metals
Volume111
DOIs
Publication statusPublished - 1 Jun 2000
Externally publishedYes

Fingerprint

Tin oxides
indium oxides
Indium
tin oxides
Light emitting diodes
Polymers
Ethylene
ethylene
light emitting diodes
sulfonic acid
Spectroscopy
Polystyrenes
polystyrene
polymers
spectroscopy
Electrodes
electrodes
Acids
ITO (semiconductors)
Electric potential

ASJC Scopus subject areas

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

Cite this

Effect of poly(3,4-ethylene dioxythiophene) on the built-in field in polymer light-emitting diodes probed by electroabsorption spectroscopy. / Brown, T. M.; Kim, J. S.; Friend, R. H.; Cacialli, F.; Daik, Rusli; Feast, W. J.

In: Synthetic Metals, Vol. 111, 01.06.2000, p. 285-287.

Research output: Contribution to journalArticle

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AU - Friend, R. H.

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AU - Daik, Rusli

AU - Feast, W. J.

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AB - Here we report electroabsorption (EA) measurements on light-emitting diodes (LEDs), fabricated with poly(4,4′-diphenylene diphenylvinylene) (PDPV) as the emissive layer in indium-tin oxide (ITO)/poly(3,4-ethylene dioxythiophene) (PEDOT):polystyrene sulfonic acid (PSS)/PDPV/Ca-Al and ITO/PDPV/Ca-Al structures. In the latter structure, the built-in potential, determined from nulling the EA signal, corresponds to the difference between the work functions of the electrodes. By incorporating a PEDOT:PSS film between the ITO electrode and the emissive layer we find that such a built-in voltage increases by 0.5 V. The correspondent lowering of the anodic barrier height at the PDPV interface is likely to be responsible for the improvement in device performance.

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