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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.

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


Authors

Inês G. Tavares

Erki Enkvist

Joosep Kaimre

Asko Uri



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
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 237
Article Number 118183
DOI https://doi.org/10.1016/j.jlumin.2021.118183

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