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Proceedings Paper

Interfacial electronic structures of organic/metal interfaces studied by UV photoemission
Author(s): Hisao Ishii; Kiyoshi Sugiyama; Kazuhiko Seki
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Paper Abstract

The electronic structures of model interfaces of organic electroluminescent (EL) devices were investigated with UV photoemission spectroscopy (UPS). At model interfaces of an Al/Alq3/TPD/Au device aluminum, TPD: N,N'-diphenyl-N- N'-(3-methylphenyl)-1,1'-biphenyl-4,4PRM-diamine) and DP-NTCI/metal interfaces , the vacuum level shifts were observed, indicating the invalidity of the traditional energy level alignment model where a common vacuum level is assumed at organic/metal interface. On the other hand, the results for Alq3/TPD interface showed little vacuum level shift, leading to apparent applicability of the traditional model. The observed interfacial electronic structures corresponds well to the injecting nature of the interface. The effect of air exposure to the interfacial electronic structure work function were discussed, together with the results for porphyrin/metal interfaces.

Paper Details

Date Published: 1 December 1997
PDF: 10 pages
Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); doi: 10.1117/12.279342
Show Author Affiliations
Hisao Ishii, Nagoya Univ. (Japan)
Kiyoshi Sugiyama, Nagoya Univ. (Japan)
Kazuhiko Seki, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 3148:
Organic Light-Emitting Materials and Devices
Zakya H. Kafafi, Editor(s)

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