Polypyridine as an efficient electron-transporting polymer for light-emitting diodes

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Abstract
In polymer light-emitting diodes (LEDs), a pre-requisite for efficient operation is the balance of 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 layer in polymer LEDs. We have achieved much improved LED performance by incorporating polypyridine as an electron-transporting polymer in LEDs using either poly(p-phenylenevinylene) or poly(2-methoxy, 5- (2' ethyl-hexyloxy)-p-phenylenevinylene) as the hole- transporting and emitting layer. the optimization of the layer thickness leads to increases in efficiency of up to a factor 60 over comparable single layer devices.

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