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Erschienen in:
01.10.2007
Inverse conjugated polymer opals and their luminescent spectra
Erschienen in: Journal of Materials Science: Materials in Electronics | Sonderheft 1/2007
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Abstract
Colloidal silica spheres are usually used for making opal photonic crystals. With the aim to create tunable or otherwise functional opals we have coated colloidal SiO2 spheres with conjugated polymers, including: polyaniline sulfonic acid, polypyrrole and MEH-PPV (poly [2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene]). Spheres coated with MEH-PPV were dispersed in H2O and coated with polyelectrolytes that charged the colloidal surfaces allowing the polymer coated spheres to self-assemble by sedimentation under gravity into close packed structures with well ordered crystalline domains. Inverse MEH-PPV/polypropylene photonic crystals were fabricated and their photoluminescence was blue shifted compared to a uniform MEH-PPV film.