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Influence of star-like iridium complexes in the graphoepitaxy of polyfluorene thin films.

Knaapila, M.; Torkkeli, M; Lyons, B.P.; Hunt, M.R.C.; Hase, T.P.A.; Seeck, O.H.; Bouchenoire, L.; Serimaa, R.; Monkman, A.P.


M. Knaapila

M Torkkeli

B.P. Lyons

T.P.A. Hase

O.H. Seeck

L. Bouchenoire

R. Serimaa


We report on the impact on the equatorial and meridional orientation in hairy-rod poly[9,9-bis(2-ethylhexyl)-fluorene-2,7-diyl] thin films when blended with tris-cyclometalated oligo-fluorenylpyridine iridium(III) complex. The presence of this transition-metal complex does not alter the underlying helical motif of the polymer chain or the hexagonal unit-cell intermolecular packing. However, systematic changes in the resulting texture patterning of the crystallites are observed. Crystallites with two preferred a-b orientations, so called type I and II and differing by 30 degrees, are superimposed on an isotropic background that is designated as type III. The extent of meridional alignment for all three is found to be similar.

Journal Article Type Article
Publication Date 2006-12
Journal Physical Review B
Print ISSN 1098-0121
Electronic ISSN 1550-235X
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 74
Pages 1-5
Public URL
Publisher URL