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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

Peter H. Beton



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.

Journal Article Type Article
Publication Date Jan 8, 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
APA6 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
DOI https://doi.org/10.1021/acs.nanolett.9b03787
Keywords Mechanical Engineering; General Materials Science; Bioengineering; General Chemistry; Condensed Matter Physics
Publisher URL https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.9b03787

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