“… ,,,,,− Hereafter, the energy values of the intrinsic exciton PL peak and the red-shifted PL peak are referred to as E 11 and E 11 *, respectively. The red-shifted PL feature of the doped nanotubes has been attributed to a reduced band gap and exciton energy of the dopant-induced local states. ,,,− Microscopically, these defects were attributed to ether- or epoxide-type oxygen adducts ,,, that induce local midgap states with specific energies depending on the details of the local chemical structures (Figure ). This was further confirmed by comparing the experimental results of the individual SWCNTs by density functional theory (DFT) calculations .…”