Morphology and Environment-Dependent Fluorescence in Blends Containing a Phenylenevinylene Conjugated Polymer.
2007 (English)In: Thin Solid Films, Vol. 515, 8412-8418 p.Article in journal (Refereed) Published
Near-field scanning optical microscopy and single molecule spectroscopy have been employed to study a large number of blends containing a highly fluorescent and amorphous conjugated polymer, ‘superyellow’ (a phenylenevinylene copolymer). We find that blend films with a non-fluorescent and semi-crystalline polymer, poly(ethylene oxide) (PEO), with a superyellow content between 9 and 50 mass% exhibit phase separation with no evidence for admixing of the two components, while films with a lower superyellow content of ≤ 1 mass% content comprise a solid-state solution of superyellow within a crystalline PEO matrix. Interestingly, films with approximately the same amount of superyellow as PEO (similar to those used in, e.g., light-emitting electrochemical cells) exhibit a bi-continuous network morphology. We also report that the superyellow fluorescence spectrum shows a remarkable sensitivity to the physical and chemical environment of superyellow.
Place, publisher, year, edition, pages
2007. Vol. 515, 8412-8418 p.
IdentifiersURN: urn:nbn:se:umu:diva-6542OAI: oai:DiVA.org:umu-6542DiVA: diva2:146211