Topological defects in semiconducting carbon nanotubes as triplet exciton traps and single-photon emitters <jats:p>First-principles calculations reveal how topological defects in semiconducting carbon nanotubes trap triplet excitons and enable single-photon emission at telecom wavelengths, offering new insights into their potential for photonic devices.</jats:p> 17 11 6884-6891 6884-6891 Royal Society of Chemistry (RSC)