Revealing the origin of fast delayed fluorescence in a donor functionalized bisterpyridine

Felix D. Goll; Andreas Schelhorn; Dziugas Litvinas; Francisco Carmona; Lev Kazak; Fedor Jelezko; Christoph Lambert; Malte Gather; Alexander J. C. Kuehne; Ulrich Ziener

doi:10.1002/chem.202303067

Revealing the origin of fast delayed fluorescence in a donor functionalized bisterpyridine

Felix D. Goll, Andreas Schelhorn, Dziugas Litvinas, Francisco Carmona, Lev Kazak, Fedor Jelezko, Christoph Lambert, Malte Gather, Alexander J. C. Kuehne, Ulrich Ziener^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	e202303067
Number of pages	9
Journal	Chemistry - A European Journal
Volume	Early View
Early online date	30 Oct 2023
DOIs	https://doi.org/10.1002/chem.202303067
Publication status	E-pub ahead of print - 30 Oct 2023

Keywords

Donor-acceptor
Fluorescence
Isomerization
Lifetime
Oligopyridine

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Goll_2023_CEJ_Revealing_CCBY
Copyright © 2023 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Final published version, 3.09 MBLicence: CC BY

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title = "Revealing the origin of fast delayed fluorescence in a donor functionalized bisterpyridine",

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.",

keywords = "Donor-acceptor, Fluorescence, Isomerization, Lifetime, Oligopyridine",

author = "Goll, {Felix D.} and Andreas Schelhorn and Dziugas Litvinas and Francisco Carmona and Lev Kazak and Fedor Jelezko and Christoph Lambert and Malte Gather and Kuehne, {Alexander J. C.} and Ulrich Ziener",

note = "This project has been partly funded by the European Union Horizon 2021 research and innovation programme under grant agreement No. 101073045 (TADFsolutions). M. C. G. acknowledges financial support by the Alexander von Humboldt Stiftung (Humboldt professorship). F. J. acknowledges support by BMBF and EU via QSens, H2020 ERC HyperQ project (856432), QCIRCLE (101059999, HORIZON), QuMicro (101046911, HORIZON), and FLORIN (101086142, HORIZON). Open Access funding enabled and organized by Projekt DEAL.",

year = "2023",

month = oct,

day = "30",

doi = "10.1002/chem.202303067",

language = "English",

volume = "Early View",

journal = "Chemistry - A European Journal",

issn = "0947-6539",

publisher = "John Wiley & Sons, Ltd",

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T1 - Revealing the origin of fast delayed fluorescence in a donor functionalized bisterpyridine

AU - Goll, Felix D.

AU - Schelhorn, Andreas

AU - Litvinas, Dziugas

AU - Carmona, Francisco

AU - Kazak, Lev

AU - Jelezko, Fedor

AU - Lambert, Christoph

AU - Gather, Malte

AU - Kuehne, Alexander J. C.

AU - Ziener, Ulrich

N1 - This project has been partly funded by the European Union Horizon 2021 research and innovation programme under grant agreement No. 101073045 (TADFsolutions). M. C. G. acknowledges financial support by the Alexander von Humboldt Stiftung (Humboldt professorship). F. J. acknowledges support by BMBF and EU via QSens, H2020 ERC HyperQ project (856432), QCIRCLE (101059999, HORIZON), QuMicro (101046911, HORIZON), and FLORIN (101086142, HORIZON). Open Access funding enabled and organized by Projekt DEAL.

PY - 2023/10/30

Y1 - 2023/10/30

N2 - 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.

AB - 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.

KW - Donor-acceptor

KW - Fluorescence

KW - Isomerization

KW - Lifetime

KW - Oligopyridine

U2 - 10.1002/chem.202303067

DO - 10.1002/chem.202303067

M3 - Article

SN - 0947-6539

VL - Early View

JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

M1 - e202303067

ER -

Revealing the origin of fast delayed fluorescence in a donor functionalized bisterpyridine

Abstract

Keywords

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