Single-walled carbon nanotubes (SWNTs) with diameters between ～1.1 and ～1.5 nm prepared by the pulsed laser vaporization, dispersed and surfactant-stabilized in D_2O (transparent up to ～1800 nm) show photo- luminescence (PL) from ～1300 up to >1750 nm corresponding to the lowest electronic interband transitions of semiconducting tubes. The characteristic features of this PL such as sharp emission and excitation peaks corresponding to specific (n,m) tubes are similar to those reported recently for SWNTs with smaller diameters around 1 nm. The experimental data are compared with tight-binding model calculations. For the structural assignment of SWNTs we used the empirical relations derived by Bachilo et al.
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