Journal
ORGANIC ELECTRONICS
Volume 14, Issue 11, Pages 3117-3122Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2013.07.022
Keywords
OLED; Delayed electroluminescence; Transient electroluminescence; Recombination; Trapping; Trap assisted recombination
Funding
- German ministry of education and research [FKZ 13N10883]
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We show that after voltage turn-off the recombination of the charges which are stored in the on-state may follow a trap-assisted mechanism instead of the Langevin formula in organic light-emitting diodes. A microscopic model based on this form of recombination is introduced, which not only fits the transient electroluminescence very well in the whole range of the off-state but also provides parameters quantitatively characterizing the stored charges in the on-state. In the last part, we briefly compare the work by Weichsel et al. [1] and our model, trying to constitute a comprehensive picture of the stored charges in OLEDs. As an OLED model system we have chosen a host/guest system co-doped with red and green phosphorescent emitters. (C) 2013 Elsevier B.V. All rights reserved.
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