5. Conclusion

Near-infrared photoluminescence, or fluorescence, is one of the original intrinsic properties of single-leaf carbon nanotubes, involving excitonic transitions between the energy states associated with van Hove singularities. The excitation and emission wavelengths depend not only on the nanotube structure (diameter, chiral angle) but also on the nanotubes' dielectric environment. PL intensity is low, but can be optimized by controlling nanotube individualization and avoiding doping and defects. The photoluminescence of single-leaf carbon nanotubes opens up new applications in the field of photonics, thanks to coupling with optical resonators and the resulting improvement in properties, which can be implemented in the photonic components of the future.