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Proceedings Paper

Chiral liquid-crystalline poly(9.9-dialkflourene)s for circularly polarized electroluminescence
Author(s): Heinz-Georg Nothofer; Masao Oda; Dieter Neher; Ullrich Scherf
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Paper Abstract

Light-emitting diodes based on chiral substituted, liquid crystalline (pi) -conjugated poly(fluorene)s have been built up which emit bluish light with a significant circularly- polarized component, despite the sub-micrometer thickness of the active layer. After proper annealing absolute values of the dissymmetry factor exceed 0.15 in absorption, and up to 0.25 in emission are measured. Compared to the first demonstration of CPEL in a conjugated polymer, a 200-fold increase in the degree of circular polarization in emission is achieved. Since polyfluorenes have been proven to be efficient and stable emitters in polymer light-emitting diodes, this concept has the potential for the construction of large-area circularly-polarized light sources for use in LCD displays and all-plastic optical storage devices.

Paper Details

Date Published: 24 October 2000
PDF: 5 pages
Proc. SPIE 4107, Liquid Crystals IV, (24 October 2000); doi: 10.1117/12.405324
Show Author Affiliations
Heinz-Georg Nothofer, Max-Planck-Institut fuer Polymerforschung (Germany)
Masao Oda, Univ. Potsdam (Germany)
Dieter Neher, Univ. Potsdam (Germany)
Ullrich Scherf, Max-Planck-Institut fuer Polymerforschung (Germany)

Published in SPIE Proceedings Vol. 4107:
Liquid Crystals IV
Iam-Choon Khoo, Editor(s)

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