ABOUT THE MECHANISM OF MECHANOLUMINESCENCE OF GRAPHITE AND GRAPHENE

Mechanoluminescence covers the phenomena of luminescence arising from various types of mechanical effects (friction, impact, stretching, compression, etc.) on metals, crystals, polymers, etc. There are two main points of view on the occurrence of mechanoluminescence during the destruction of dielectrics: some authors attribute it to a gas discharge between the edges of growing cracks, while others attribute it to electron-excited free radicals on the edges of cracks. The purpose of this article is to propose a new mechanism for the occurrence of mechanoluminescence in solids using graphite and graphene as an example. We have shown that the energy of deformation under external influence is spent on heat, acoustic emission, field emission, and mechanoluminescence. It was found that the mechanoluminescence spectra of graphite contain a peak at 2.27 eV (547 nm) and for graphene – 2.0 eV (620 nm).