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Plasma functionalization of graphene is one of the facile ways to tune itsdoping level without the need for wet chemicals making graphenephotoluminescent. Microscopic corrugations in the two-dimensional structure ofbilayer CVD graphene having a quasi-free-suspended top layer, such as grapheneripples, nanodomes, and bubbles, may significantly enhance local reactivityleading to etching effects on exposure to plasma. Here, we discovered thatbilayer CVD graphene treated with nitrogen plasma exhibits efficientUV-green-red emission, where the excitation at 250 nm leads tophotoluminescence with the peaks at 390, 470, and 620 nm, respectively. Byusing Raman scattering and spectroscopic ellipsometry, we investigated dopingeffects induced by oxygen or nitrogen plasma on the optical properties ofsingle- and bilayer CVD graphene. The surface morphology of the samples wasstudied by atomic force microscopy. It is revealed that the top sheet ofbilayer graphene becomes perforated after the treatment by nitrogen plasma. Ourcomprehensive study indicates that the dominant green emission is associatedwith the edge defect structure of perforated graphene filled with nitrogen. Thediscovered efficient emission appearing in nitrogen plasma treated perforatedgraphene may have a significant potential for the development of advancedoptoelectronic materials.

Efficient Green Emission from Edge States in Graphene Perforated by Nitrogen Plasma Treatment