UV photoemission study of 8-hydroxyquinoline aluminum (ALQ3) / metal interfaces

K. Sugiyama, D. Yoshimura, E. Ito, T. Miyazaki, Y. Hamatani, I. Kawamoto, Y. Ouchi, K. Seki, H. Ishii

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Abstract

Electronic structure of tris(8-hydroxyquinolino) aluminum (Alq3) / metal interface was directly investigated as a model interface of electroluminescent (EL) devices by UV photoemission spectroscopy (UPS). Simulated spectrum of Alq3 calculated by a MNDO / PM3 molecular orbital calculation showed a good correspondence with the observed UPS spectrum. Highest occupied molecular orbitals (HOMOs) of Alq3 was assigned to HOMO of the ligands. At Alq3 / metal interfaces, shift of the vacuum level was observed, in contrast to the traditional assumption with common vacuum level at the interface. Interfacial energy diagrams determined by the results of UPS corresponds well to actual carrier-injecting character at the interface.

Original languageEnglish
Pages (from-to)239-244
Number of pages6
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume285-286
Publication statusPublished - Dec 1 1996
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Sugiyama, K., Yoshimura, D., Ito, E., Miyazaki, T., Hamatani, Y., Kawamoto, I., Ouchi, Y., Seki, K., & Ishii, H. (1996). UV photoemission study of 8-hydroxyquinoline aluminum (ALQ3) / metal interfaces. Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, 285-286, 239-244.