Intramolecular interchromophore singlet-singlet and triplet-singlet energy transfer in a metal-free donor-acceptor emitter

Tavares, Inês G.; Enkvist, Erki; Kaimre, Joosep; Uri, Asko; Dias, Fernando B.

Abstract

In this work we demonstrate the occurrence of singlet to singlet, and triplet to singlet, intramolecular energy transfer between two thiophene-comprising donors (D) and a central perylene bisimide acceptor (A) covalently linked to each other trough a linker that separates the donor and acceptor moieties in a D-A-D structure. The designed metal-free organic tandem luminophore is herein designated as ARC-1467. Energy transfer from the excited triplet state of the thiophene donor to the singlet state of the perylene bisimide acceptor is observed in solution and in solid films of ARC-1467 dispersed in polystyrene. When the perylene bisimide acceptor is directly excited, the fluorescence decays with 4.9 ns lifetime. However, upon excitation of the donor unit in the near-UV region, delayed fluorescence of perylene bisimide with 5.7 μs lifetime is distinctly observed demonstrating the occurrence of energy transfer from the triplet state of the D unit to the perylene bisimide acceptor.

Citation

Tavares, I. G., Enkvist, E., Kaimre, J., Uri, A., & Dias, F. B. (2021). Intramolecular interchromophore singlet-singlet and triplet-singlet energy transfer in a metal-free donor-acceptor emitter. Journal of Luminescence, 237, Article 118183. https://doi.org/10.1016/j.jlumin.2021.118183

• Journal Article Type: Article
• Acceptance Date: May 6, 2021
• Online Publication Date: May 18, 2021
• Publication Date: 2021-09
• Deposit Date: Jul 27, 2021
• Publicly Available Date: May 18, 2023
• Journal: Journal of Luminescence
• Print ISSN: 0022-2313
• Electronic ISSN: 1872-7883
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 237
• Article Number: 118183
• DOI: https://doi.org/10.1016/j.jlumin.2021.118183
• Public URL: https://durham-repository.worktribe.com/output/1244238