Abstract
Light-emitting polymer electrochemical cells (LECs) emit brighter light at lower voltages in comparison to conventional LEDs. The fundamental mode of operation of LECs is investigated here: The internal electrical field distribution was determined for LECs based on methyl-substituted ladder-type poly(p-phenylene) (mLPPP) using electroabsorption measurements as a function of an external bias voltage. These results were compared to measurements on mLPPP LEDs, and a model for the working principle of both types of devices is presented, showing that electrochemical doping is important in LECs.
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