Emissive semi-interpenetrating polymer networks for ink-jet printed multilayer OLEDs
Description
Solution-processing of multilayered Organic Light Emitting Diodes (OLEDs) remains a challenge that is often addressed by cross-linking polymer precursors into insoluble networks. Herein, we blend an emissive polymer carrying a Thermally Activated Delayed Fluorescence (TADF) emitter and a host species with a photo-cross-linkable polymer containing ortho-methylbenzaldehyde and maleimide groups as reactive cross-linkers to form a Semi-Interpenetrating Polymer Network (SIPN) upon irradiation at 365 nm. The progress of the cross-linking via Diels–Alder [4 + 2]-cycloaddition is monitored by FT-IR-spectroscopy and is correlated with the solvent resistance of the SIPN. Furthermore, the influence of the molecular weight and the cross-linker content on the efficiency of the cross-linking are investigated. The resulting polymer films show a high solvent resistance evidenced by photoluminescence and AFM measurements and are thus suitable for a successive solution-processed layer. Furthermore, a comonomer carrying the commercial host molecule 1,3-bis(N-carbazolyl)benzene (mCP) was synthesized in high yields, copolymerized and integrated in the emissive SIPN with good resistance against organic solvents. Lastly, the polymer blends were processed with an ink-jet printer and turned into an insoluble SIPN.
Impact and interest:
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ID Code: | 212953 | ||||||||
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Item Type: | Contribution to Journal (Journal Article) | ||||||||
Refereed: | Yes | ||||||||
ORCID iD: |
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Additional Information: | Acknowledgements: C. B.-K., J. B., P. S., and S. Y. acknowledge funding in the context of an Australian Research Council (ARC) Linkage project LP160101230. C. B.-K. is grateful for an ARC Laureate Fellowship enabling his photochemical research program as well as continued key support from the Queensland University of Technology (QUT). P. S. is thankful for an ARC Future Fellowship. The Central Analytical Research Facility (CARF) at QUT is gratefully acknowledged for access to analytical instrumentation. S. V. K. would like to thank E. Graham (QUT) for TGA measurements and P. Kamm (QUT) for helpful discussions. The authors thank P. Shaw (University of Queensland) for the TRPL measurements. | ||||||||
Measurements or Duration: | 7 pages | ||||||||
DOI: | 10.1039/D1PY00794G | ||||||||
ISSN: | 1759-9954 | ||||||||
Pure ID: | 97957402 | ||||||||
Divisions: | Current > Research Centres > Centre for Materials Science Current > Research Centres > Centre for a Waste Free World Current > QUT Faculties and Divisions > Faculty of Science Current > Schools > School of Chemistry & Physics |
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Copyright Owner: | © The Royal Society of Chemistry 2021 | ||||||||
Copyright Statement: | This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au | ||||||||
Deposited On: | 02 Sep 2021 04:30 | ||||||||
Last Modified: | 29 Feb 2024 11:35 |
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