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We report pure carbon-based superlattices that exhibit direct band gaps andexcellent optical absorption and emission properties at the threshold energy.The structures are nearly identical to that of cubic diamond except thatdefective layers characterized by five- and seven-membered rings areintercalated in the diamond lattice. The direct band gaps lie in the range of5.6~5.9 eV, corresponding to wavelengths of 210~221 nm. The dipole matrixelements of direct optical transition are comparable to that of GaN, suggestingthat the superlattices are promising materials as an efficient deep ultravioletlight emitter. Molecular dynamics simulations show that the superlattices arethermally stable even at a high temperature of 2000 K. We provide a possibleroute to the synthesis of superlattices through wafer bonding of diamond (100)surfaces.

Direct band gap carbon superlattices with efficient optical transition