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We report on experimental investigations of an electrically driven WSe2 basedlight-emitting van der Waals heterostructure. We observe a threshold voltagefor electroluminescence significantly lower than the corresponding singleparticle band gap of monolayer WSe2. This observation can be interpreted byconsidering the Coulomb interaction and a tunneling process involving excitons,well beyond the picture of independent charge carriers. An applied magneticfield reveals pronounced magneto-oscillations in the electroluminescence of thefree exciton emission intensity with a 1/B-periodicity. This effect is ascribedto a modulation of the tunneling probability resulting from the Landauquantization in the graphene electrodes. A sharp feature in the differentialconductance indicates that the Fermi level is pinned and allows for anestimation of the acceptor binding energy.

Sub-bandgap voltage electroluminescence and magneto-oscillations in a WSe2 light-emitting van der Waals heterostructure