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The Role of Dinuclearity in Promoting Thermally Activated Delayed Fluorescence (TADF) in Cyclometallated, N^C^N-coordinated Platinum(II) Complexes

Pander, Piotr Henryk; Zaytsev, Andrey; Sil, Amit; Williams, J.A. Gareth; Lanoë, Pierre-Henri; Kozhevnikov, Valery Nikolaevich; Dias, Fernando B.

The Role of Dinuclearity in Promoting Thermally Activated Delayed Fluorescence (TADF) in Cyclometallated, N^C^N-coordinated Platinum(II) Complexes Thumbnail


Authors

Andrey Zaytsev

Amit Sil

Pierre-Henri Lanoë

Valery Nikolaevich Kozhevnikov



Abstract

In this work we present synthesis and an in-depth photophysical analysis of a di-Pt(II) complex with a ditopic bis-N^C^N ligand. The complex exhibits a dual luminescent behaviour by emitting simultaneously delayed fluorescence and phosphorescence. By comparing with the mono-Pt(II) analogue, we demonstrate that thermally activated delayed fluorescence (TADF) is turned on in the di-Pt(II) complex due to the occurrence of three main factors which are not verified in the mono-Pt(II) analogue: a larger singlet radiative rate (krS), a smaller singlet-triplet energy gap (ΔEST) and a longer phosphorescence decay lifetime (τPH). We observe similar trends among other di-Pt(II) complexes and concluded that bimetallic structures promote conditions favourable for TADF to occur. The diplatinum(II) complex also shows a long wavelength-emissive excimer which yields near infrared electroluminescence, λel = 805 nm, in a solution-processed OLED device with EQEmax = 0.51 %. We believe this is the highest efficiency reported to date for an excimer Pt(II) emitter with λel > 800 nm in a solution-processed OLED device.

Citation

Pander, P. H., Zaytsev, A., Sil, A., Williams, J. G., Lanoë, P., Kozhevnikov, V. N., & Dias, F. B. (2021). The Role of Dinuclearity in Promoting Thermally Activated Delayed Fluorescence (TADF) in Cyclometallated, N^C^N-coordinated Platinum(II) Complexes. Journal of Materials Chemistry C Materials for optical and electronic devices, 9(32), 10276-10287. https://doi.org/10.1039/d1tc02562g

Journal Article Type Article
Acceptance Date Jul 14, 2021
Online Publication Date Jul 16, 2021
Publication Date Aug 28, 2021
Deposit Date Jul 21, 2021
Publicly Available Date Jul 22, 2021
Journal Journal of Materials Chemistry C Materials for optical and electronic devices
Print ISSN 2050-7526
Electronic ISSN 2050-7534
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 9
Issue 32
Pages 10276-10287
DOI https://doi.org/10.1039/d1tc02562g

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