Protonated metal-oxide electrodes for organic light emitting diodes

F. Nüesch, K. Kamarás, L. Zuppiroli

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Protonation of the indium tin oxide (ITO) electrode surface by nitric acid vapor gives rise to an ionic double layer producing an important increase in the effective electrode workfunction. This shift of ~0.8 eV can be determined from the photoresponse of single layer diodes consisting of tris (8-hydroxyquinoline) aluminium (Alq) sandwiched between protonated ITO and aluminium electrodes. Due to the chemical treatment, the contact between the protonated hole injecting oxide electrode and Alq becomes ohmic. Under an applied electric field, the efficient injection of holes produces a positive space charge in the organic layer which enhances the emission of electrons from the cathode.

Original languageEnglish
Pages (from-to)194-200
Number of pages7
JournalChemical Physics Letters
Volume283
Issue number3-4
Publication statusPublished - Feb 6 1998

Fingerprint

Organic light emitting diodes (OLED)
Oxides
metal oxides
light emitting diodes
Metals
Electrodes
electrodes
indium oxides
tin oxides
aluminum
Nitric Acid
Protonation
nitric acid
Aluminum
Electric space charge
space charge
Diodes
Cathodes
cathodes
Vapors

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Protonated metal-oxide electrodes for organic light emitting diodes. / Nüesch, F.; Kamarás, K.; Zuppiroli, L.

In: Chemical Physics Letters, Vol. 283, No. 3-4, 06.02.1998, p. 194-200.

Research output: Contribution to journalArticle

Nüesch, F. ; Kamarás, K. ; Zuppiroli, L. / Protonated metal-oxide electrodes for organic light emitting diodes. In: Chemical Physics Letters. 1998 ; Vol. 283, No. 3-4. pp. 194-200.
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