Chiral liquid-crystalline poly(9.9-dialkflourene)s for circularly polarized electroluminescence

Heinz-Georg Nothofer; Masao Oda; Dieter Neher; Ullrich Scherf

doi:10.1117/12.405324

24 October 2000 Chiral liquid-crystalline poly(9.9-dialkflourene)s for circularly polarized electroluminescence

Heinz-Georg Nothofer, Masao Oda, Dieter Neher, Ullrich Scherf

Proceedings Volume 4107, Liquid Crystals IV; (2000) https://doi.org/10.1117/12.405324
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

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.

Citation Download Citation

Heinz-Georg Nothofer, Masao Oda, Dieter Neher, and Ullrich Scherf "Chiral liquid-crystalline poly(9.9-dialkflourene)s for circularly polarized electroluminescence", Proc. SPIE 4107, Liquid Crystals IV, (24 October 2000); https://doi.org/10.1117/12.405324

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