Bridge control of photophysical properties in benzothiazole-phenoxazine emitters – from thermally activated delayed fluorescence to room temperature phosphorescence

Paredis, Simon; Cardeynaels, Tom; Deckers, Jasper; Danos, Andrew; Vanderzande, Dirk; Monkman, Andrew P.; Champagne, Benoît; Maes, Wouter

Abstract

The bridging phenyl group in a fluorescent phenoxazine-benzothiazole donor–acceptor dyad is replaced by either a naphthalene or a thiophene moiety to probe the influence of a more extended conjugated system or the presence of a sulfur-containing heteroaromatic spacer on the emissive properties. These seemingly small structural alterations strongly affect the relative positions of the excited states, the fluorescence intensity, and the emission mechanism. Consequently, thermally activated delayed fluorescence (TADF) is observed at longer timescales for the materials with phenyl and naphthalene linkers, whereas the thiophene group promotes room temperature phosphorescence (RTP), both in the solid state and in solution, and enhances singlet oxygen generation. Phosphorescence in solution at ambient temperature from a purely organic molecule without heavy halogen functionalisation is quite rare, and this unique property calls for further specific attention.

Citation

Paredis, S., Cardeynaels, T., Deckers, J., Danos, A., Vanderzande, D., Monkman, A. P., Champagne, B., & Maes, W. (2022). Bridge control of photophysical properties in benzothiazole-phenoxazine emitters – from thermally activated delayed fluorescence to room temperature phosphorescence. Journal of Materials Chemistry C Materials for optical and electronic devices, 10(12), 4775-4784. https://doi.org/10.1039/d1tc04885f

• Journal Article Type: Article
• Acceptance Date: Jan 4, 2022
• Online Publication Date: Jan 5, 2022
• Publication Date: Mar 28, 2022
• Deposit Date: Mar 15, 2022
• Publicly Available Date: Jan 5, 2023
• 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: 10
• Issue: 12
• Pages: 4775-4784
• DOI: https://doi.org/10.1039/d1tc04885f
• Public URL: https://durham-repository.worktribe.com/output/1212119