Polyfluorenes with polyphenylene dendron side chains: toward non-aggregating, light-emitting polymers

S Setayesh; A C Grimsdale; T Weil; V Enkelmann; K Müllen; F Meghdadi; E J List; G Leising

doi:10.1021/ja0031220

Polyfluorenes with polyphenylene dendron side chains: toward non-aggregating, light-emitting polymers

J Am Chem Soc. 2001 Feb 7;123(5):946-53. doi: 10.1021/ja0031220.

Authors

S Setayesh¹, A C Grimsdale, T Weil, V Enkelmann, K Müllen, F Meghdadi, E J List, G Leising

Affiliation

¹ Contribution from the Max-Planck-Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.

PMID: 11456629
DOI: 10.1021/ja0031220

Abstract

A polyfluorene 12 has been prepared in which bulky polyphenylene dendrimer substituents suppress formation of long wavelength emitting aggregates, thus giving a polymer with pure blue emission. Absorption- and emission spectra and molecular modeling confirm that the bulky dendrimer side chains do not cause extra torsion between the fluorene units. New polyfluorenes with 9,9-diaryl substituents have been prepared to determine the minimum size of substituent necessary for aggregation suppression. An LED using 12 has been demonstrated to produce blue emission with onset voltages below 4 V.