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Suppression of the keto-emission in polyfluorene light-emitting diodes : Experiments and models

  • The spectral characteristics of polyfluorene (PF)-based light-emitting diodes (LEDs) containing a defined low concentration of either keto-defects or of the polymer poly(9.9-octylfuorene-co-benzothiadiazole) (F8BT) are preseneted. Both types of blend layers were tested in different device configurations with respect to the relative and absolute intensities of green blue emission components. It is shown that blending hole-transporting molecules into the emission layer at low concentration or incorporation of a suitable hole-transport layer reduces the green emission contribution in the electroluminescence (EL) spectrum of the PF:F8BT blend, which is similar to what is observed for the keto- containing PF layer. We conclude that the keto-defects in PF homopolymer layers mainly constitute weakly emissive electron traps, in agreement with the results of quantum-mechanical calculations

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Author:Xiao Hui Yang, Frank Jaiser, Dieter NeherORCiDGND, PaDreyia V. Lawson, Jean-Luc Brédas, Egbert Zojer, Roland Güntner, Patricia Scanduicci de Freitas, Michael Forster, Ulli Scherf
ISSN:1616-301X
Document Type:Article
Language:English
Year of first Publication:2004
Year of Completion:2004
Release Date:2017/03/24
Source:Advanced Functional Materials. - ISSN 1616-301X. - 14 (2004), 11, S. 1097 - 1104
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert
Institution name at the time of publication:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik