Transient luminescence in organic light-emitting diodes explained by trap-assisted recombination of stored charges |
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Authors: | Dong Zhao Hans-Peter Loebl Volker Van Elsbergen |
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Affiliation: | 1. Karlsruhe Institute of Technology, Schlossplatz 19, D-76131 Karlsruhe, Germany;2. Philips Technologie GmbH, Innovative Technologies, Research Laboratories, Philipsstrasse 8, D-52068 Aachen, Germany |
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Abstract: | 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. |
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Keywords: | OLED Delayed electroluminescence Transient electroluminescence Recombination Trapping Trap assisted recombination |
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