Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS
Volume 40, Issue 10A, Pages L1068-L1070Publisher
INST PURE APPLIED PHYSICS
DOI: 10.1143/JJAP.40.L1068
Keywords
exciton dynamics; exciton-charge interaction; exciton quenching; organic semiconductor device; organic light-emitting diode
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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) similar to 10(-10) cm(3)/s.
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