(a) X-ray diffraction pattern of AgInS2 NCs at room temperature. The blue line corresponds to the XRD pattern for tetragonal AgInS2 (PDF Card 03-065-5163). (b) TEM overview image of AgInS2 NC sample featuring mean radius. (c) AgInS2 NC size distribution extracted from (b). (d) Optical absorption (black dashed line), PL (solid red line, excitation at 3.06 eV), and PLE (triangles) spectra for a colloidal NC solution in toluene. (e) Normalized PL decay measured at 1.64 eV. (f) PL spectra of the same NCs under progressively lower energy excitation (from the bottom to top corresponding to the PLE data in panel ‘b’).