Ultrafast structure and dynamics in the thermally activated delayed fluorescence of a carbene-metal-amide

Hall, Christopher R., Romanov, Alexander S., Bochmann, Manfred ORCID: https://orcid.org/0000-0001-7736-5428 and Meech, Stephen R. ORCID: https://orcid.org/0000-0001-5561-2782 (2018) Ultrafast structure and dynamics in the thermally activated delayed fluorescence of a carbene-metal-amide. The Journal of Physical Chemistry Letters, 9. 5873–5876. ISSN 1948-7185

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Abstract

Thermally activated delayed fluorescence has enormous potential for the development of efficient light emitting diodes. A recently discovered class of molecules (the carbene – metal – amides, CMAs) are exceptionally promising as they combine the small singlet - triplet energy gap required for thermal activation with a large transition moment for emission. Calculations suggest that excited state structural dynamics modulate the critical coupling between singlet and triplet states, but do not agree on the nature of those dynamics. Here we report ultrafast time resolved transient absorption and Raman studies of CMA photodynamics. The measurements reveal complex structural evolution following intersystem crossing on the tens to hundreds of picoseconds timescale, and a change in the low frequency vibrational spectrum between singlet and triplet states. The latter is assigned to a change in frequency or amplitude associated with a Raman active mode localized on the metal centre.

Item Type:	Article
Uncontrolled Keywords:	ultrafast dynamics,fluorescence,organic light emitting diode,raman
Faculty \ School:	Faculty of Science > School of Chemistry
UEA Research Groups:	Faculty of Science > Research Groups > Chemistry of Light and Energy Faculty of Science > Research Groups > Chemistry of Materials and Catalysis Faculty of Science > Research Groups > Centre for Photonics and Quantum Science
Depositing User:	LivePure Connector
Date Deposited:	08 Oct 2018 16:30
Last Modified:	09 Feb 2023 13:45
URI:	https://ueaeprints.uea.ac.uk/id/eprint/68428
DOI:	10.1021/acs.jpclett.8b02797

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