Phase-Separated Thin Film Structures for Efficient Polymer Blend Light-Emitting Diodes
2010 (English)In: NANO LETTERS, ISSN 1530-6984, Vol. 10, no 2, 385-392 p.Article in journal (Refereed) Published
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.
Organic semiconductors, conjugated polymer blends, polymer light-emitting diodes, phase separation, thin film morphology
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-54060DOI: 10.1021/nl9025105ISI: 000274338800005OAI: oai:DiVA.org:liu-54060DiVA: diva2:298316