Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

Electroabsorption spectroscopy as a tool to probe charge-transfer and state mixing in thermally-activated delayed fluorescence emitters.

De Sa Pereira, Daniel and Menelaou, Christopher and Danos, Andrew and Marian, Christel Maria and Monkman, Andrew P. (2019) 'Electroabsorption spectroscopy as a tool to probe charge-transfer and state mixing in thermally-activated delayed fluorescence emitters.', Journal of physical chemistry letters., 10 (12). pp. 3205-3211.

Abstract

Solid-state electroabsorption is demonstrated as a powerful tool to probe the charge-transfer (CT) character and state mixing in the low energy optical transitions of two structurally similar thermally-activated delayed fluorescent (TADF) materials with divergent photophysical and device performances. The Liptay model is used to fit differentials of the low energy absorption bands to the measured electroabsorption spectra, with both emitters showing CT characteristics and large changes of dipole moments on excitation despite the associated absorption bands appearing structured. High electric fields then reveal transfer of oscillator strength to a state close to the CT in the better performing molecule. With supporting TDDFT-TDA and DFT/MRCI calculations, this state showed ππ* characteristics of a local acceptor triplet that strongly mixes with the σπ* of the CT. The emitter with poor TADF performance showed no evidence of such mixing.

Item Type:Article
Full text:Publisher-imposed embargo
(AM) Accepted Manuscript
File format - PDF
(1663Kb)
Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution.
Download PDF
(1787Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1021/acs.jpclett.9b00999
Publisher statement:This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Date accepted:21 May 2019
Date deposited:24 May 2019
Date of first online publication:22 May 2019
Date first made open access:No date available

Save or Share this output

Export:
Export
Look up in GoogleScholar