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

Pander, Piotr Henryk and Daniels, Ruth and Zaytsev, Andrey and Horn, Ashleigh and Sil, Amit and Penfold, Thomas and Williams, Gareth and Kozhevnikov, Valery Nikolaevich and Dias, Fernando B. (2021) 'Exceptionally Fast Radiative Decay of a Dinuclear Platinum Complex Through Thermally Activated Delayed Fluorescence.', Chemical science. (17). pp. 6172-6180.


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.

Item Type:Article
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Publisher 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.
Date accepted:19 March 2021
Date deposited:23 March 2021
Date of first online publication:22 March 2021
Date first made open access:04 June 2021

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