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Delayed Blue Fluorescence via Upper-Triplet State Crossing from C–C Bonded Donor–Acceptor Charge Transfer Molecules with Azatriangulene Cores

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Delayed Blue Fluorescence via Upper-Triplet State Crossing from C–C Bonded Donor–Acceptor Charge Transfer Molecules with Azatriangulene Cores. / Ward, Jonathan S.; Kukhta, Nadzeya A.; Santos, Paloma L. dos et al.
In: Chemistry of Materials, Vol. 31, No. 17, 10.09.2019, p. 6684-6695.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Ward, JS, Kukhta, NA, Santos, PLD, Congrave, DG, Batsanov, AS, Monkman, AP & Bryce, MR 2019, 'Delayed Blue Fluorescence via Upper-Triplet State Crossing from C–C Bonded Donor–Acceptor Charge Transfer Molecules with Azatriangulene Cores', Chemistry of Materials, vol. 31, no. 17, pp. 6684-6695. https://doi.org/10.1021/acs.chemmater.9b01184

APA

Ward, J. S., Kukhta, N. A., Santos, P. L. D., Congrave, D. G., Batsanov, A. S., Monkman, A. P., & Bryce, M. R. (2019). Delayed Blue Fluorescence via Upper-Triplet State Crossing from C–C Bonded Donor–Acceptor Charge Transfer Molecules with Azatriangulene Cores. Chemistry of Materials, 31(17), 6684-6695. https://doi.org/10.1021/acs.chemmater.9b01184

Vancouver

Ward JS, Kukhta NA, Santos PLD, Congrave DG, Batsanov AS, Monkman AP et al. Delayed Blue Fluorescence via Upper-Triplet State Crossing from C–C Bonded Donor–Acceptor Charge Transfer Molecules with Azatriangulene Cores. Chemistry of Materials. 2019 Sept 10;31(17):6684-6695. Epub 2019 May 22. doi: 10.1021/acs.chemmater.9b01184

Author

Ward, Jonathan S. ; Kukhta, Nadzeya A. ; Santos, Paloma L. dos et al. / Delayed Blue Fluorescence via Upper-Triplet State Crossing from C–C Bonded Donor–Acceptor Charge Transfer Molecules with Azatriangulene Cores. In: Chemistry of Materials. 2019 ; Vol. 31, No. 17. pp. 6684-6695.

Bibtex

@article{f1825efd87a446a982a65afc17fd13a6,
title = "Delayed Blue Fluorescence via Upper-Triplet State Crossing from C–C Bonded Donor–Acceptor Charge Transfer Molecules with Azatriangulene Cores",
abstract = "We report the synthesis and structural and photophysical characterization of two series of molecules with functionalized azatriangulene electron donor cores and three pendant electron acceptor units. The presented donor and acceptor units are joined by C–C bonds, instead of the usual C–heteroatom bonds often found in thermally activated delayed fluorescence (TADF) emitters. The effects of the donor–acceptor strength and donor–acceptor dihedral angle on the emission properties are assessed. The data establish that the singlet–triplet energy gap is >0.3 eV and that delayed emission is present in only specific host matrices, irrespective of host polarity. Specific host behavior is atypical of many TADF materials, and we suggest the delayed emission in this work does not occur by a conventional vibronically coupled TADF mechanism, as the ΔEST value is too large. Detailed photophysical analysis and supporting density functional theory calculations suggest that some presented azatriangulene molecules emit via an upper-triplet state crossing mechanism. This work highlights that several different mechanisms can be responsible for delayed emission, often with highly similar photophysics. Detailed photophysical analysis is required to establish which delayed emission mechanism is occurring. Our results also highlight a clear future direction toward vibronically coupled C–C bonded TADF materials.",
author = "Ward, {Jonathan S.} and Kukhta, {Nadzeya A.} and Santos, {Paloma L. dos} and Congrave, {Daniel G.} and Batsanov, {Andrei S.} and Monkman, {Andrew P.} and Bryce, {Martin R.}",
year = "2019",
month = sep,
day = "10",
doi = "10.1021/acs.chemmater.9b01184",
language = "English",
volume = "31",
pages = "6684--6695",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "AMER CHEMICAL SOC",
number = "17",

}

RIS

TY - JOUR

T1 - Delayed Blue Fluorescence via Upper-Triplet State Crossing from C–C Bonded Donor–Acceptor Charge Transfer Molecules with Azatriangulene Cores

AU - Ward, Jonathan S.

AU - Kukhta, Nadzeya A.

AU - Santos, Paloma L. dos

AU - Congrave, Daniel G.

AU - Batsanov, Andrei S.

AU - Monkman, Andrew P.

AU - Bryce, Martin R.

PY - 2019/9/10

Y1 - 2019/9/10

N2 - We report the synthesis and structural and photophysical characterization of two series of molecules with functionalized azatriangulene electron donor cores and three pendant electron acceptor units. The presented donor and acceptor units are joined by C–C bonds, instead of the usual C–heteroatom bonds often found in thermally activated delayed fluorescence (TADF) emitters. The effects of the donor–acceptor strength and donor–acceptor dihedral angle on the emission properties are assessed. The data establish that the singlet–triplet energy gap is >0.3 eV and that delayed emission is present in only specific host matrices, irrespective of host polarity. Specific host behavior is atypical of many TADF materials, and we suggest the delayed emission in this work does not occur by a conventional vibronically coupled TADF mechanism, as the ΔEST value is too large. Detailed photophysical analysis and supporting density functional theory calculations suggest that some presented azatriangulene molecules emit via an upper-triplet state crossing mechanism. This work highlights that several different mechanisms can be responsible for delayed emission, often with highly similar photophysics. Detailed photophysical analysis is required to establish which delayed emission mechanism is occurring. Our results also highlight a clear future direction toward vibronically coupled C–C bonded TADF materials.

AB - We report the synthesis and structural and photophysical characterization of two series of molecules with functionalized azatriangulene electron donor cores and three pendant electron acceptor units. The presented donor and acceptor units are joined by C–C bonds, instead of the usual C–heteroatom bonds often found in thermally activated delayed fluorescence (TADF) emitters. The effects of the donor–acceptor strength and donor–acceptor dihedral angle on the emission properties are assessed. The data establish that the singlet–triplet energy gap is >0.3 eV and that delayed emission is present in only specific host matrices, irrespective of host polarity. Specific host behavior is atypical of many TADF materials, and we suggest the delayed emission in this work does not occur by a conventional vibronically coupled TADF mechanism, as the ΔEST value is too large. Detailed photophysical analysis and supporting density functional theory calculations suggest that some presented azatriangulene molecules emit via an upper-triplet state crossing mechanism. This work highlights that several different mechanisms can be responsible for delayed emission, often with highly similar photophysics. Detailed photophysical analysis is required to establish which delayed emission mechanism is occurring. Our results also highlight a clear future direction toward vibronically coupled C–C bonded TADF materials.

U2 - 10.1021/acs.chemmater.9b01184

DO - 10.1021/acs.chemmater.9b01184

M3 - Journal article

VL - 31

SP - 6684

EP - 6695

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 17

ER -