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Goll FD, Schelhorn A, Litvinas D, Tenopala-Carmona F, Kazak L, Jelezko F, Lambert C, Gather MC, Kuehne AJC, Ziener U. Revealing the Origin of Fast Delayed Fluorescence in a Donor Functionalized Bisterpyridine. Chemistry 2024; 30:e202303067. [PMID: 37902606 DOI: 10.1002/chem.202303067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 10/27/2023] [Accepted: 10/30/2023] [Indexed: 10/31/2023]
Abstract
A new carbazole-substituted bisterpyridine with pronounced delayed fluorescence is presented. While the molecular donor-acceptor-donor design suggests the origin of this to be thermally activated delayed fluorescence (TADF), results from various photophysical characterizations, OLED characteristics, temperature-dependent NMR spectroscopy, and DFT calculations all point against the involvement of triplet states. The molecule exhibits blue emission at about 440 nm with two or more fast decay channels in the lower nanosecond range in both solution and thin films. The delayed emission is proposed to be caused by rotational vibrational modes. We suggest that these results are generally applicable, especially for more complex molecules, and should be considered as alternative or competitive emissive relaxation pathways in the field of organic light emitting materials.
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Affiliation(s)
- Felix D Goll
- Institute of Organic Chemistry III -, Macromolecular Chemistry and Organic Materials, Ulm University, 89081, Ulm, Germany
| | - Andreas Schelhorn
- Institute of Organic Chemistry III -, Macromolecular Chemistry and Organic Materials, Ulm University, 89081, Ulm, Germany
| | - Džiugas Litvinas
- Humboldt Centre for Nano- and Biophotonics, Department of Chemistry, University of Cologne, Greinstraße 4-6, 50939, Köln, Germany
| | - Francisco Tenopala-Carmona
- Humboldt Centre for Nano- and Biophotonics, Department of Chemistry, University of Cologne, Greinstraße 4-6, 50939, Köln, Germany
| | - Lev Kazak
- Institute for Quantum Optics, Ulm University, 89081, Ulm, Germany
| | - Fedor Jelezko
- Institute for Quantum Optics, Ulm University, 89081, Ulm, Germany
| | - Christoph Lambert
- Institut für Organische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Malte C Gather
- Humboldt Centre for Nano- and Biophotonics, Department of Chemistry, University of Cologne, Greinstraße 4-6, 50939, Köln, Germany
- SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, KY16 9SS, St Andrews, Fife, UK
| | - Alexander J C Kuehne
- Institute of Organic Chemistry III -, Macromolecular Chemistry and Organic Materials, Ulm University, 89081, Ulm, Germany
| | - Ulrich Ziener
- Institute of Organic Chemistry III -, Macromolecular Chemistry and Organic Materials, Ulm University, 89081, Ulm, Germany
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