Light-emitting electrochemical cells with microsecond response times basedon PPPs and novel PPVs

The response times of light-emitting electrochemical cells (LEC) can be dec reased to several microseconds by minimising phase separations in the activ e layer. This e.g. can be realised by optimising the phase morphology of th e blend of an ion conductive polyethylene oxide and an electronic conductiv e laddertype PPP or by using a single polymer combining electron- and ion c onduction properties, so that phase separations are excluded. Latter can be realised by a PPV with ionic conductive sidechains. We present efficient L ECs yielding extremely low onset voltages.