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Optimizing photon upconversion by decoupling excimer formation and triplet triplet annihilation
Univ Gothenburg, Dept Chem & Mol Biol, S-41296 Gothenburg, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Univ Cambridge, Dept Phys, Cavendish Lab, 19 JJ Thompson Ave, Cambridge CB3 0HE, England.ORCID iD: 0000-0001-6583-8654
Univ Gothenburg, Dept Chem & Mol Biol, S-41296 Gothenburg, Sweden.
Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden.
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2020 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 22, no 3, p. 1715-1720Article in journal (Refereed) Published
Abstract [en]

Perylene is a promising annihilator candidate for triplet-triplet annihilation photon upconversion, which has been successfully used in solar cells and in photocatalysis. Perylene can, however, form excimers, reducing the energy conversion efficiency and hindering further development of TTA-UC systems. Alkyl substitution of perylene can suppress excimer formation, but decelerate triplet energy transfer and triplet-triplet annihilation at the same time. Our results show that mono-substitution with small alkyl groups selectively blocks excimer formation without severly compromising the TTA-UC efficiency. The experimental results are complemented by DFT calculations, which demonstrate that excimer formation is suppressed by steric repulsion. The results demonstrate how the chemical structure can be modified to block unwanted intermolecular excited state relaxation pathways with minimal effect on the preferred ones.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2020. Vol. 22, no 3, p. 1715-1720
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Physical Chemistry
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URN: urn:nbn:se:uu:diva-406465DOI: 10.1039/c9cp06561jISI: 000509371400079PubMedID: 31895392OAI: oai:DiVA.org:uu-406465DiVA, id: diva2:1413135
Funder
Swedish Research Council, 2016-03354EU, European Research Council, ERC-2017-StG-757733Knut and Alice Wallenberg FoundationSwedish Research Council, 2018-00238Available from: 2020-03-09 Created: 2020-03-09 Last updated: 2020-03-09Bibliographically approved

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