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dc.contributor.authorBeton, Peter
dc.contributor.otherKerfoot, James
dc.contributor.otherNizovtsev, Anton S.
dc.contributor.otherSummerfield, Alex
dc.contributor.otherKorolkov, Vladimir V.
dc.contributor.otherTaniguchi, Takashi
dc.contributor.otherWatanabe, Kenji
dc.contributor.otherAntolín, Elisa
dc.contributor.otherBesley, Elena
dc.description.abstractWe 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/2D hybrid tunneling diode. Electrons can tunnel from 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 > eVSD, indicating up-conversion by energies up to ~ 1 eV. We show that tunnelling 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 up-conversion.en_UK
dc.publisherThe University of Nottinghamen_UK
dc.subject.lcshMonomolecular filmsen_UK
dc.subject.lcshTunnel diodesen_UK
dc.titleTriplet excitation and electroluminescence from a supramolecular monolayer embedded in a boron nitride tunnel barrieren_UK
dc.subject.freeElectroluminescence, Van der Waas Heterostructure, Up-conversion, Molecular Self-Assemblyen_UK
dc.subject.jacsPhysical sciencesen_UK
dc.subject.lcQ Science::QD Chemistry::QD450 Physical and theoretical chemistryen_UK
dc.subject.lcT Technology::TK Electrical engineering. Electronics Nuclear engineering::TK7800 Electronicsen_UK
dc.subject.lcQ Science::QC Physics::QC501 Electricity and magnetismen_UK - 01.07.2019en_UK
uon.divisionUniversity of Nottingham, UK Campus::Faculty of Science::School of Physics and Astronomyen_UK
uon.funder.controlledEngineering & Physical Sciences Research Councilen_UK
uon.datatypeRaw data files: AFM images (.ibw), photoluminescence and electroluminescence spectra (.ls6 and .txt), current vs. voltage measurement files (.txt), optical microscopy images (.jpg)en_UK
uon.funder.freeLeverhulme Trusten_UK
uon.collectionmethodOptical microscopy, Fluorescence microscopy, Atomic force microscopy, probe station current-voltage measurementsen_UK

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