In pristine SWCNTs excitation and emission nearly completely overlap in the NIR (Stokes shift < 2 nm). Such a small Stokes shift means that it is difficult to separate excitation and emission light efficiently. Interestingly, we find that the Stokes shift in G d -SWCNTs linearly increases with the peak position of fluorescence (Figure ). The linear fit shows that for each nanometer shift in absorption peak position the Stokes shift is increased by 0.87 nmemission/nmabsorbance leading to a maximum Stokes shift of 27.5 nm for G d high-SWCNTs. This is in agreement with a correlation between peak broadening in G d -SWCNTs and fluorescence emission redshift . The large Stokes shift in G d high-SWCNTs allows both excitation and emission readout in the beneficial NIR-tissue transparency window. This promises even deeper tissue penetration and makes g-defects useful for in vivo application of SWCNTs. The extended Stokes shift can be considered as a consequence of elongated exciton lifetimes in the shallow g-defect traps , leading to a loss of energy due to local interactions .