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

Tavares, Inês G. and Enkvist, Erki and Kaimre, Joosep and Uri, Asko and Dias, Fernando B. (2021) 'Intramolecular interchromophore singlet-singlet and triplet-singlet energy transfer in a metal-free donor-acceptor emitter.', Journal of luminescence., 237 . p. 118183.


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.

Item Type:Article
Full text:Publisher-imposed embargo until 18 May 2023.
(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives 4.0.
File format - PDF
Publisher Web site:
Publisher statement:© 2021 This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Date accepted:06 May 2021
Date deposited:27 July 2021
Date of first online publication:18 May 2021
Date first made open access:18 May 2023

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