Polymer interfaces studied by photoelectron spectroscopy: Li on polydioctylfluorene and Alq3

G. Greczynski*, M. Fahlman, W. R. Salaneck, N. Johansson, D. A. Dos Santos, Jean-Luc Bredas

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

24 Scopus citations

Abstract

The behavior of lithium atoms deposited on the surfaces of ultra-thin spin-coated films of poly(dioctylfluorene), and of condensed molecular solid films of tris(8-hydroxyquinoline) aluminum, have been studied through a combined experimental-theoretical approach. The Li-atoms donate charges to the organic systems, leading to doping-induced electronic states in the otherwise forbidden energy gap. The changes in the electronic structure induced by charge transfer from the Li-atoms are different in the two materials studied, and depend upon the localization of the electronic states to which the electrons are transferred. In the case of the delocalized wave functions of the π-system of poly(dioctylfluorene), at low doping levels, the added charges lead to the formation of polaron states, while at higher doping concentrations, bipolaron states are formed. In the case of the tris(8-hydroxyquinoline) aluminum, however, up to a level of three added electrons per molecule, the added electrons reside in states localized on each of the three ligands.

Original languageEnglish (US)
Pages (from-to)322-326
Number of pages5
JournalThin Solid Films
Volume363
Issue number1
DOIs
StatePublished - Mar 1 2000
EventThe Asia-Pacific Symposium on Organic Electroluminescent Materials and Devices - Hong Kong, Hong Kong
Duration: Jun 8 1999Jun 11 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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