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Exceptionally Fast Radiative Decay of a Dinuclear Platinum Complex Through Thermally Activated Delayed Fluorescence

Pander, Piotr Henryk; Daniels, Ruth; Zaytsev, Andrey; Horn, Ashleigh; Sil, Amit; Penfold, Thomas; Williams, Gareth; Kozhevnikov, Valery Nikolaevich; Dias, Fernando B.

Exceptionally Fast Radiative Decay of a Dinuclear Platinum Complex Through Thermally Activated Delayed Fluorescence Thumbnail


Authors

Ruth Daniels

Andrey Zaytsev

Ashleigh Horn

Amit Sil

Thomas Penfold

Gareth Williams

Valery Nikolaevich Kozhevnikov



Abstract

A novel dinuclear platinum(II) complex featuring a ditopic, bis-tetradentate ligand has been prepared. The ligand offers each metal ion a planar O^N^C^N coordination environment, with the two metal ions bound to the nitrogen atoms of a bridging pyrimidine unit. The complex is brightly luminescent in the red region of the spectrum with a photoluminescence quantum yield of 83% in deoxygenated methylcyclohexane solution at ambient temperature, and shows a remarkably short excited state lifetime of 2.1 μs. These properties are the result of an unusually high radiative rate constant of around 4 × 105 s–1, a value which is comparable to that of the very best performing Ir(III) complexes. This unusual behaviour is the result of efficient thermally activated reverse intersystem crossing, promoted by a small singlet–triplet energy difference of only 69 ± 3 meV. The complex was incorporated into solution-processed OLEDs achieving EQEmax = 7.4 %. We believe this to be the first fully evidenced report of a Pt(II) complex showing thermally activated delayed fluorescence (TADF) at room temperature, and indeed of a Pt(II)-based delayed fluorescence emitter to be incorporated into an OLED.

Citation

Pander, P. H., Daniels, R., Zaytsev, A., Horn, A., Sil, A., Penfold, T., …Dias, F. B. (2021). Exceptionally Fast Radiative Decay of a Dinuclear Platinum Complex Through Thermally Activated Delayed Fluorescence. Chemical Science, 6172-6180. https://doi.org/10.1039/d1sc00160d

Journal Article Type Article
Acceptance Date Mar 19, 2021
Online Publication Date Mar 22, 2021
Publication Date 2021
Deposit Date Mar 23, 2021
Publicly Available Date Jun 4, 2021
Journal Chemical Science
Print ISSN 2041-6520
Electronic ISSN 2041-6539
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Issue 17
Pages 6172-6180
DOI https://doi.org/10.1039/d1sc00160d
Public URL https://durham-repository.worktribe.com/output/1278575

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Published Journal Article (1.3 Mb)
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Publisher Licence URL
http://creativecommons.org/licenses/by/3.0/

Copyright Statement
P. H. Pander, R. Daniels, A. Zaytsev, A. Horn, A. SIL, T. Penfold, G. Williams, V. N. Kozhevnikov and F. B. Dias, Chem. Sci., 2021, Accepted Manuscript , DOI: 10.1039/D1SC00160D
This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.






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