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Phase-Separated Thin Film Structures for Efficient Polymer Blend Light-Emitting Diodes
University of Cambridge.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry . Linköping University, The Institute of Technology.
National Physics Lab, Teddington .
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2010 (English)In: NANO LETTERS, ISSN 1530-6984, Vol. 10, no 2, 385-392 p.Article in journal (Refereed) Published
Abstract [en]

We report laterally and vertically phase-separated thin film structures in conjugated polymer blends created by polymer molecular weight variation. We find that micrometer-scale lateral phase separation is critical in achieving high initial device efficiency of light-emitting diodes, whereas improved balance of charge carrier mobilities and film thickness uniformity are important in maintaining high efficiency at high voltages. The optoelectronic properties of these blend thin films and devices are strongly influenced by the polymer chain order/disorder and the interface state formed at polymer/polymer heterojunctions.

Place, publisher, year, edition, pages
2010. Vol. 10, no 2, 385-392 p.
Keyword [en]
Organic semiconductors, conjugated polymer blends, polymer light-emitting diodes, phase separation, thin film morphology
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-54060DOI: 10.1021/nl9025105ISI: 000274338800005OAI: oai:DiVA.org:liu-54060DiVA: diva2:298316
Available from: 2010-02-22 Created: 2010-02-22 Last updated: 2010-02-22

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Doherty, Walter JSalaneck, William R

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