▎ 摘　　要

NOVELTY - Operation of a device involves providing a device comprising a substrate (210) comprising a tunnel barrier (220) arranged on an active region defined on the substrate, a monolayer of graphene (230) arranged on the tunnel barrier, a dielectric (240) material arranged on the monolayer of graphene and an electrode (250) arranged on the dielectric material, applying a voltage (V1) across the electrode and the monolayer of graphene to adjust a Fermi level within the monolayer of graphene to a Fermi level position within a valence band of the monolayer of graphene based upon a predetermined photonic emission wavelength and applying a voltage (V2) across the substrate and the monolayer of graphene to inject a current into a conduction band of the monolayer of graphene to cause the monolayer of graphene to emit photons at the emission wavelength. USE - Operation of device. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the device. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the device and its operational procedure. Substrate (210) Tunnel barrier (220) Graphene (230) Dielectric (240) Electrode (250)