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Triplet Excitation and Electroluminescence from a Supramolecular Monolayer Embedded in a Boron Nitride Tunnel Barrier

Svatek, Simon A.; Kerfoot, James; Summerfield, Alex; Nizovtsev, Anton S.; Korolkov, Vladimir V.; Taniguchi, Takashi; Watanabe, Kenji; Antolín, Elisa; Besley, Elena; Beton, Peter H.

Authors

Simon A. Svatek

James Kerfoot

Alex Summerfield

Anton S. Nizovtsev

Vladimir V. Korolkov

Takashi Taniguchi

Kenji Watanabe

Elisa Antolín

ELENA BESLEY Elena.Besley@nottingham.ac.uk
Professor of Theoretical Computational Chemistry



Abstract

© 2019 American Chemical Society. We show that ordered monolayers of organic molecules stabilized by hydrogen bonding on the surface of exfoliated few-layer hexagonal boron nitride (hBN) flakes may be incorporated into van der Waals heterostructures with integral few-layer graphene contacts forming a molecular/two-dimensional hybrid tunneling diode. Electrons can tunnel through the hBN/molecular barrier under an applied voltage VSD, and we observe molecular electroluminescence from an excited singlet state with an emitted photon energy hν > eVSD, indicating upconversion by energies up to ∼1 eV. We show that tunneling electrons excite embedded molecules into singlet states in a two-step process via an intermediate triplet state through inelastic scattering and also observe direct emission from the triplet state. These heterostructures provide a solid-state device in which spin-triplet states, which cannot be generated by optical transitions, can be controllably excited and provide a new route to investigate the physics, chemistry, and quantum spin-based applications of triplet generation, emission, and molecular photon upconversion.

Citation

Svatek, S. A., Kerfoot, J., Summerfield, A., Nizovtsev, A. S., Korolkov, V. V., Taniguchi, T., …Beton, P. H. (2020). Triplet Excitation and Electroluminescence from a Supramolecular Monolayer Embedded in a Boron Nitride Tunnel Barrier. Nano Letters, 20(1), 278-283. https://doi.org/10.1021/acs.nanolett.9b03787

Journal Article Type Article
Acceptance Date Dec 10, 2019
Online Publication Date Dec 10, 2019
Publication Date Jan 8, 2020
Deposit Date Jan 8, 2020
Publicly Available Date Feb 29, 2020
Journal Nano Letters
Print ISSN 1530-6984
Electronic ISSN 1530-6992
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 20
Issue 1
Pages 278-283
DOI https://doi.org/10.1021/acs.nanolett.9b03787
Keywords Mechanical Engineering; General Materials Science; Bioengineering; General Chemistry; Condensed Matter Physics
Public URL https://nottingham-repository.worktribe.com/output/3610841
Publisher URL https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.9b03787

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