Revealing the Origin of Fast Delayed Fluorescence in a Donor Functionalized Bisterpyridine-Reference-Cited by-同舟云学术

Revealing the Origin of Fast Delayed Fluorescence in a Donor Functionalized Bisterpyridine

Published:2023-11-13 Issue:2 Volume:30 Page:
ISSN:0947-6539
Container-title:Chemistry – A European Journal
language:en
Short-container-title:Chemistry A European J

Author:

Goll Felix D.¹,Schelhorn Andreas¹,Litvinas Džiugas²^ORCID,Tenopala‐Carmona Francisco²^ORCID,Kazak Lev³^ORCID,Jelezko Fedor³,Lambert Christoph⁴,Gather Malte C.²⁵,Kuehne Alexander J. C.¹,Ziener Ulrich¹^ORCID

Affiliation:

1. Institute of Organic Chemistry III – Macromolecular Chemistry and Organic Materials Ulm University 89081 Ulm Germany

2. Humboldt Centre for Nano- and Biophotonics Department of Chemistry, University of Cologne Greinstraße 4–6 50939 Köln Germany

3. Institute for Quantum Optics Ulm University 89081 Ulm Germany

4. Institut für Organische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany

5. SUPA School of Physics and Astronomy University of St Andrews North Haugh KY16 9SS St Andrews, Fife UK

Abstract

AbstractA 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.

Funder

HORIZON EUROPE Marie Sklodowska-Curie Actions

Alexander von Humboldt-Stiftung

Publisher

Wiley

Subject

General Chemistry,Catalysis,Organic Chemistry

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