An efficient electron-transporting polymer for light-emitting diodes
S Dailey; M Halim; E Rebourt; L E Horsburgh; I D W Samuel; A P Monkman; S Dailey; Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK; M Halim; Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK; E Rebourt; Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK; L E Horsburgh; Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK; I D W Samuel; Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK; A P Monkman; Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK
Журнал:
Journal of Physics: Condensed Matter
Дата:
1998-06-15
Аннотация:
The efficient operation of polymer light-emitting diodes (LEDs) requires balanced injection and transport of electrons and holes. This has stimulated much research into suitable electron-injecting and transporting materials. We report the use of polypyridine as an efficient electron-transporting polymer. We have achieved much-improved LED performance by incorporating polypyridine as an electron-transporting layer in a poly(p-phenylene vinylene) (PPV) LED and optimizing layer thicknesses to balance transport of electrons and holes. The external quantum efficiency of these LEDs is 0.25%, 60 times greater than similar devices without the electron-transporting layer.
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