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The response times of light-emitting electrochemical cells (LEC) can be decreased to several microseconds by minimising phase separations in the active layer. This e.g. can be realised by optimising the phase morphology of the blend of an ion conductive polyethylene oxide and an electronic conductive laddertype PPP or by using a single polymer combining electron- and ion conduction properties, so...
Polypyrrole (PPy) films processed from solution have been used as semi-transparent anodes in polymer light-emitting diodes. An external quantum efficiency of 0.5% was achieved with poly (2-methoxy,5-(2′-ethyl-hexyloxy)-1,4-phenylene-vinylene) (MEH—PPV) as the luminescent polymer. The hole-injection potential barrier between PPy and MEH—PPV, as determined by Fowler—Nordheim analysis, is≈ 0.23 eV.
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