Resonant Energy Transfer of Triplet Excitons from Pentacene to PbSe Nanocrystals
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Authors
Tabachnyk, Maxim
Ehrler, Bruno
Gélinas, Simon
Böhm, Marcus L
Walker, Brian J
Musselman, Kevin P
Publication Date
2014-10-05Journal Title
Nature Materials
ISSN
1476-1122
Publisher
NPG
Volume
13
Pages
1033-1038
Language
en_US
Type
Article
Metadata
Show full item recordCitation
Tabachnyk, M., Ehrler, B., Gélinas, S., Böhm, M. L., Walker, B. J., Musselman, K. P., Greenham, N., et al. (2014). Resonant Energy Transfer of Triplet Excitons from Pentacene to PbSe Nanocrystals. Nature Materials, 13 1033-1038. https://doi.org/10.1038/nmat4093
Abstract
The efficient transfer of energy between organic and inorganic semiconductors is a widely sought after property, but has to date been limited to the transfer of spin singlet excitons. Here we report efficient resonant-energy transfer of molecular spin triplet excitons from organic semiconductors to inorganic semiconductors. We use ultrafast optical absorption spectroscopy to track the dynamics of triplets, generated in pentacene via singlet exciton fission, at the interface with lead selenide (PbSe) nanocrystals. We show that triplets transfer to PbSe rapidly (<1ps) and efficiently, with 1.9 triplets transferred for every photon absorbed in pentacene, but only when the bandgap of the nanocrystals is close to resonance (±0.2 eV) with the triplet energy. Following triplet transfer, the excitation can undergo either charge separation, allowing photovoltaic operation, or radiative recombination in the nanocrystal, enabling luminescent harvesting of triplet exciton energy in light emitting structures.
Sponsorship
EPSRC (EP/M005143/1)
EPSRC (EP/G060738/1)
Identifiers
External DOI: https://doi.org/10.1038/nmat4093
This record's URL: https://www.repository.cam.ac.uk/handle/1810/246345
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