(WAKA:ref) pers:(Inganäs Olle) pers:(Andersson Mats)
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Light-emitting diodes with variable colours from polymer blends
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- Berggren, Magnus (author)
- Linköpings universitet,Tillämpad Fysik,Tekniska högskolan
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- Inganäs, Olle (author)
- Linköpings universitet,Tillämpad Fysik,Tekniska högskolan
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- Gustafsson, Göran (author)
- Linköpings universitet,Tillämpad Fysik,Tekniska högskolan
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- (creator_code:org_t)
- Nature Publishing Group, 1994
- 1994
- English.
- In: Nature. - : Nature Publishing Group. - 0028-0836 .- 1476-4687. ; 372:6505, s. 444-446
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Keyword
- TECHNOLOGY
- TEKNIKVETENSKAP
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