Triplet transfer from PbS quantum dots to tetracene ligands: is faster always better?

Autor:	Gray V; Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK victor.gray@kemi.uu.se ar525@cam.ac.uk.; Department of Chemistry - Ångström Laboratory, Uppsala University Box 523 751 20 Uppsala Sweden., Drake W; Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK victor.gray@kemi.uu.se ar525@cam.ac.uk., Allardice JR; Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK victor.gray@kemi.uu.se ar525@cam.ac.uk., Zhang Z; Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK victor.gray@kemi.uu.se ar525@cam.ac.uk., Xiao J; Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK victor.gray@kemi.uu.se ar525@cam.ac.uk., Congrave DG; Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK., Royakkers J; Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK., Zeng W; Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK., Dowland S; Cambridge Photon Technology J. J. Thomson Avenue Cambridge CB3 0HE UK., Greenham NC; Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK victor.gray@kemi.uu.se ar525@cam.ac.uk., Bronstein H; Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK., Anthony JE; University of Kentucky Center for Applied Energy Research 2582 Research Park Dr Lexington Kentucky 40511 USA., Rao A; Cavendish Laboratory, University of Cambridge J. J. Thomson Avenue Cambridge CB3 0HE UK victor.gray@kemi.uu.se ar525@cam.ac.uk.
Jazyk:	angličtina
Zdroj:	Journal of materials chemistry. C [J Mater Chem C Mater] 2022 Oct 11; Vol. 10 (43), pp. 16321-16329. Date of Electronic Publication: 2022 Oct 11 (Print Publication: 2022).
DOI:	10.1039/d2tc03470k
Abstrakt:	Quantum dot-organic semiconductor hybrid materials are gaining increasing attention as spin mixers for applications ranging from solar harvesting to spin memories. Triplet energy transfer between the inorganic quantum dot (QD) and organic semiconductor is a key step to understand in order to develop these applications. Here we report on the triplet energy transfer from PbS QDs to four energetically and structurally similar tetracene ligands. Even with similar ligands we find that the triplet energy transfer dynamics can vary significantly. For TIPS-tetracene derivatives with carboxylic acid, acetic acid and methanethiol anchoring groups on the short pro- cata side we find that triplet transfer occurs through a stepwise process, mediated via a surface state, whereas for monosubstituted TIPS-tetracene derivative 5-(4-benzoic acid)-12-triisopropylsilylethynyl tetracene (BAT) triplet transfer occurs directly, albeit slower, via a Dexter exchange mechanism. Even though triplet transfer is slower with BAT the overall yield is greater, as determined from upconverted emission using rubrene emitters. This work highlights that the surface-mediated transfer mechanism is plagued with parasitic loss pathways and that materials with direct Dexter-like triplet transfer are preferred for high-efficiency applications. Competing Interests: There are no conflicts to declare. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
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