Exciton Dynamics in Organic Semiconductor Devices: Investigation of Exciton-Charge Carrier Interactions as Revealed by Photoluminescence Responses

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Abstract
We measured the photoluminescence decay curves of an organic semiconductor device when the device was electrically driven, and we investigated its exciton dynamics when there were a large number of electrons. The device consisted of a transparent electrode (indium tin oxide), a tris (8-quinolinolato) aluminum layer (Alq, 100 nm), and a metal cathode (Mg:Ag or Al, 200 nm). It was demonstrated experimentally that a singlet exciton of Alq was quenched by electrons through a bimolecular process. The rate constant of the PL quenching was estimated to be of the order of 10-9∼10-10 cm3/s.