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Proceedings Paper

Optical properties of cross-linkable fluorene copolymers
Author(s): Jorge Morgado; Ana Charas; Helena Alves; Luis Alcácer; Franco Cacialli
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Paper Abstract

Three fluorene-based copolymers carrying reactive side groups (oxetanes) were synthesised and characterised. Their optical properties are essentially controlled by the introduction of either fluorene or lower energy gap (benzothiadiazole or terthiophene) comonomers, randomly distributed along the polymer chain. We show that, in the presence of a small amount of a photoacid dispersed in the polymer films, these are converted into insoluble polymeric networks upon UV irradiation and heating. Absorption and emission spectra of the polymeric networks are similar to those of the starting polymers, showing that the cross-linking, due to the polymerisation of the oxetane groups, does not interfere. This ability to induce their insolubility upon UV irradiation is used to fabricate multi-layer light-emitting diodes. Using a transmission electron microscope grid as a shadow mask we show that micrometer-size patterns can be created.

Paper Details

Date Published: 20 April 2006
PDF: 7 pages
Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619224 (20 April 2006); doi: 10.1117/12.663123
Show Author Affiliations
Jorge Morgado, Instituto Superior Técnico (Portugal)
Ana Charas, Instituto Superior Técnico (Portugal)
Helena Alves, Instituto Superior Técnico (Portugal)
Luis Alcácer, Instituto Superior Técnico (Portugal)
Franco Cacialli, Univ. College London and London Ctr. for Nanotechnology (United Kingdom)

Published in SPIE Proceedings Vol. 6192:
Organic Optoelectronics and Photonics II
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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