Fig. 2. (a) Absorption, (b) PL spectra, and (c) absolute PLQY of nanocrystals of varying size, in toluene solution. We see a sharp band edge absorption in the red spectral region (a) and a PL spectrum (b) with a small Stokes shift and a narrow full width at half maximum (FWHM) around 35 nm. The PLQY was measured at 1.7 W cm⁻². (d) TRPL decays for thin films of NCs of 3 different sizes at a fluence of 0.5 W cm⁻². With an increase in the nanoparticle size, the PL lifetime is shortened.