Controlling through-space and through-bond intramolecular charge transfer in bridged D–D′–A TADF emitters

Miranda-Salinas, Hector; Hung, Yi-Tzu; Chen, Yi-Sheng; Luo, Dian; Kao, Hao-Che; Chang, Chih-Hao; Wong, Ken-Tsung; Monkman, Andrew

doi:10.1039/d1tc02316k

Controlling through-space and through-bond intramolecular charge transfer in bridged D–D′–A TADF emitters

Miranda-Salinas, Hector; Hung, Yi-Tzu; Chen, Yi-Sheng; Luo, Dian; Kao, Hao-Che; Chang, Chih-Hao; Wong, Ken-Tsung; Monkman, Andrew

Authors

Hector Miranda Salinas hector.g.miranda-salinas@durham.ac.uk
Post Doctoral Research Associate

Yi-Tzu Hung

Yi-Sheng Chen

Dian Luo

Hao-Che Kao

Chih-Hao Chang

Ken-Tsung Wong

Professor Andrew Monkman a.p.monkman@durham.ac.uk
Professor

Abstract

Donor–donor′–acceptor molecules where the donor′ bridges the donor and acceptor have different possible interaction pathways for charge transfer. Here we study a series of donor–donor′–acceptor molecules, having the same acceptor and donor′ but different donors, and donor′–phenyl spacer–acceptor to change the spatial separation and overlap between potential through-space donor–acceptor charge transfer (CT) in competition with donor′–acceptor through-bond CT. We determine that the charge transfer driving force plays a large role in dictating which charge transfer channel is favoured. Strong donors and acceptors with large driving force favour through-space CT. We also find that solid state host packing plays an important role, with small molecule hosts that pack tightly, distorting the guest molecules, reducing D–A separation to stabilise the through-space CT state over the through-bond state. Only the through-space CT states give fast reverse intersystem crossing and efficient TADF. These results give the first insight into the photophysics of through-space CT compared to through-bond states on the same molecule.

Citation

Miranda-Salinas, H., Hung, Y., Chen, Y., Luo, D., Kao, H., Chang, C., …Monkman, A. (2021). Controlling through-space and through-bond intramolecular charge transfer in bridged D–D′–A TADF emitters. Journal of Materials Chemistry C Materials for optical and electronic devices, 9(28), https://doi.org/10.1039/d1tc02316k

Journal Article Type	Article
Acceptance Date	Jun 24, 2021
Online Publication Date	Jun 25, 2021
Publication Date	2021
Deposit Date	Nov 16, 2021
Publicly Available Date	Nov 16, 2021
Journal	Journal of Materials Chemistry C
Print ISSN	2050-7526
Electronic ISSN	2050-7534
Publisher	Royal Society of Chemistry
Peer Reviewed	Peer Reviewed
Volume	9
Issue	28
DOI	https://doi.org/10.1039/d1tc02316k