Built-in field electroabsorption spectroscopy of polymer light-emitting diodes incorporating a doped poly(3,4-ethylene dioxythiophene) hole injection layer

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

Research output: Contribution to journalArticle

502 Citations (Scopus)

Abstract

We report electroabsorption measurements of polymer light-emitting diodes, (LEDs), fabricated with poly(4-4′-diphenylene diphenylvinylene), PDPV, as the emissive layer, Ca-Al cathodes, and indium tin oxide (ITO) anodes, with and without a doped conducting polymer hole injection/ transport layer, namely poly(3,4-ethylene dioxythiophene), PEDOT, doped with poly(styrene sulfonate), PSS-. In these structures, the bias at which the electroabsorption signal is null corresponds to the difference between the electrodes' work functions. We find that such a built-in voltage increases by 0.5 V when a PEDOT:PSS film is incorporated between the ITO electrode and the emissive layer. This leads to a marked reduction of the anode barrier height at the hole-injecting interface, and accounts for a variety of improvements brought about by the PEDOT insertion, namely: (a) the increase of luminescence efficiency, (b) the reduction of the turn-on voltage, and (c) the increase of the device lifetime.

Original languageEnglish
Pages (from-to)1679-1681
Number of pages3
JournalApplied Physics Letters
Volume75
Issue number12
Publication statusPublished - 20 Sep 1999
Externally publishedYes

Fingerprint

ethylene
light emitting diodes
injection
indium oxides
tin oxides
polymers
anodes
spectroscopy
electrodes
conducting polymers
electric potential
sulfonates
insertion
polystyrene
cathodes
luminescence
life (durability)

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Built-in field electroabsorption spectroscopy of polymer light-emitting diodes incorporating a doped poly(3,4-ethylene dioxythiophene) hole injection layer. / Brown, T. M.; Kim, J. S.; Friend, R. H.; Cacialli, F.; Daik, Rusli; Feast, W. J.

In: Applied Physics Letters, Vol. 75, No. 12, 20.09.1999, p. 1679-1681.

Research output: Contribution to journalArticle

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