Exceptionally fast radiative decay of a dinuclear platinum complex through thermally activated delayed fluorescence
| العنوان: | Exceptionally fast radiative decay of a dinuclear platinum complex through thermally activated delayed fluorescence |
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| المؤلفون: | Valery N. Kozhevnikov, Thomas J. Penfold, Amit Sil, Fernando B. Dias, Andrey V. Zaytsev, Ashleigh Horn, J. A. Gareth Williams, Piotr Pander, Ruth Daniels |
| المصدر: | Chemical science, 2021(17), pp.6172-6180 [Peer Reviewed Journal] Chemical Science |
| بيانات النشر: | Royal Society of Chemistry (RSC), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Materials science, Photoluminescence, Ligand, F100, chemistry.chemical_element, Quantum yield, General Chemistry, Photochemistry, Chemistry, chemistry.chemical_compound, Intersystem crossing, chemistry, Excited state, Methylcyclohexane, Platinum, Luminescence |
| الوصف: | 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. Efficient thermally activated delayed fluorescence (TADF) in a brightly luminescent diplatinum(ii) complex results in significant enhancement of the radiative decay rate. |
| وصف الملف: | application/pdf |
| تدمد: | 2041-6539 2041-6520 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1156950f33462073e5e7864d2050547e https://doi.org/10.1039/d1sc00160d |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....1156950f33462073e5e7864d2050547e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20416539 20416520 |
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