Molecular Origin of Balanced Bipolar Transport in Neat Layers of the Emitter CzDBA

Wenlan Liu, Naresh B. Kotadiya, Paul W. M. Blom, Gert-Jan A. H. Wetzelaer, Denis Andrienko

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Recently, an efficient single-layer organic light-emitting diode has been reported, consisting of a neat layer of the diboron-based thermally activated delayed fluorescence emitter 5,10-bis(4-(9H-carbazol-9-yl)-2,6-dimethylphenyl)-5,10-dihydroboranthrene, exhibiting remarkably balanced bipolar electron and hole transport. Here, the donor–acceptor–donor architecture of the molecule is linked to the transport characteristics of its neat amorphous films. It is found that energetic disorder is larger for holes than for electrons, explaining the experimentally observed difference in temperature activation of the mobility. Although a difference in energetic disorder would suggest unbalanced charge transport, it is demonstrated that it is partly counteracted by larger coupling elements for holes.
Original languageEnglish (US)
Pages (from-to)2000120
JournalAdvanced Materials Technologies
Volume6
Issue number2
DOIs
StatePublished - Jul 6 2020
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2021-11-21
Acknowledged KAUST grant number(s): CRG
Acknowledgements: This project received funding from the European Union Horizon 2020 research and innovation programme under Grant Agreement No. 646176 (EXTMOS). D.A. thanks the BMBF grant InterPhase (FKZ 13N13661) and the European Union Horizon 2020 research and innovation programme “Widening materials models” under Grant Agreement No. 646259 (MOSTOPHOS). This research was supported by the King Abdullah University of Science and Technology (KAUST), via the Competitive Research Grants (CRG) Program. D.A. acknowledges KAUST for hosting his sabbatical.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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