Abstract
Optical absorption in organic semiconductors creates tightly bound electron-hole pairs, known as excitons. Generation of charge carriers occurs when the excitons break into positive and negative polarons;1 this process is relevant to the performance of photovoltaic devices. Exciton dissociation can be affected by an external electric field and limits the electroluminescence efficiency in organic light-emitting diodes (LEDs), being a nonradiative decay channel. Transient measurements of field-induced photoluminescence quenching in poly-(para-phenylene) films have shown that the primary step of charge generation occurs in the picosecond time domain.2 Such experiments are indirect probes and cannot monitor the state produced by the exciton dissociation, the nature of which is currently under debate.2-3
© 1998 Optical Society of America
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