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Light-emitting diodes with variable colours from polymer blends
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology. null.ORCID iD: 0000-0001-5154-0291
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology. null.
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology. null.
Chalmers Tekniska Högskola.
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1994 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 372, no 6505, 444-446 p.Article in journal (Refereed) Published
Abstract [en]

THE range of materials now available for polymer-based light-emitting diodes (LEDs) is such that electroluminescence can be obtained throughout the visible spectrum(1-12). Here we show that, by blending polymers with different emission and charge-transport characteristics, LEDs can be fabricated in which the emission colour varies as a function of the operating voltage. This phenomenon arises from the self-organizing properties of the blends, in which entropy drives phase separation of the constituent polymers and gives rise to submicrometre-sized domains having a range of compositions and emission characteristics. Emission from domains of different composition is controlled by the ease with which charge is injected, which in turn depends on the applied voltage.

Place, publisher, year, edition, pages
Nature Publishing Group , 1994. Vol. 372, no 6505, 444-446 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-74936DOI: 10.1038/372444a0ISI: A1994PV01200050OAI: oai:DiVA.org:liu-74936DiVA: diva2:497090
Available from: 2012-02-10 Created: 2012-02-10 Last updated: 2017-12-07

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Berggren, MagnusInganäs, Olle

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