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Proceedings Paper

Interfaces between poly(9,9-dioctylfluorene) and alkali metals as affected by molecular weight and oxygen
Author(s): Man Keung Fung; S. L. Lai; S. N. Bao; C. S. Lee; James J. O'Brien; Michael Inbasekaran; Weishi W. Wu; Shuit-Tong Lee
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Paper Abstract

The electronic structure of poly(9,9-dioctylfluorene)(PFO) in different molecular weights coated with alkali metals (K and Cs) has been studied by x-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). No significant differences on the electronic structures were observed for all combinations of alkali metals and PFO in different molecular weights. These metals led to low injection barrier at the K/PFO or Cs/PFO interfaces and induced bipolaron gap states in the PFO. With increasing coverage of the alkali metals, the bipolaron states and the highest-occupied molecular orbitals gradually broadened, and the two shake-up peaks of Cls XPS peaks associated with the lowest-unoccupied molecular orbitals of PFO also broadened and greatly diminished. Upon slight oxygen exposure, the two bipolaron states disappeared and the deformed features in the UPS and XPS spectra were partially recovered.

Paper Details

Date Published: 27 February 2002
PDF: 7 pages
Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); doi: 10.1117/12.457480
Show Author Affiliations
Man Keung Fung, City Univ. of Hong Kong (Hong Kong)
S. L. Lai, City Univ. of Hong Kong (Hong Kong)
S. N. Bao, City Univ. of Hong Kong and Zhejiang Univ. (Hong Kong)
C. S. Lee, City Univ. of Hong Kong (Hong Kong)
James J. O'Brien, Dow Chemical Co. (United States)
Michael Inbasekaran, Dow Chemical Co. (United States)
Weishi W. Wu, Dow Chemical Co. (United States)
Shuit-Tong Lee, City Univ. of Hong Kong (Hong Kong)

Published in SPIE Proceedings Vol. 4464:
Organic Light-Emitting Materials and Devices V
Zakya H. Kafafi, Editor(s)

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