Extended Data Fig. 3: Effect of ligands on nanocrystal excited-state dynamics.

a, Schematic of TAS procedure. Coloured circles represent photoluminescence measurements before (black) and after (red) illumination with a 405-nm laser. Periodic re-exposure of the sample to the 405-nm laser maintained a stable photoluminescence wavelength during TAS scans without causing additional segregation. The duration of the re-exposure, T, was 10 s and 3 s for neat and E+G treated nanocrystals, respectively. For neat nanocrystals, the photoluminescence wavelength was initially 649 nm and was 669 ± 1 nm after exposure; the photoluminescence of E+G-treated nanocrystals was initially 628 nm and was 632 ± 1 nm after exposure. b–e, TAS of neat (b, c) and E+G-treated (d, e) nanocrystals before (b, d) and after (c, e) illumination. f–m, Transients of neat (f–i) and E+G-treated (j–m) nanocrystals before (f, g, j, k) and after (h, i, l, m) illumination. Traces are average signal in wavelength ranges chosen to highlight wavelength-dependent dynamics. Blue, green, yellow and red traces for the neat nanocrystals and the E+G-treated nanocrystals correspond to 560–600 and 550–580 nm, 600–640 and 580–610 nm, 640–680 and 610–640 nm, 680–720 and 640–670 nm, respectively. Black dashed lines are a global fit to a tri-exponential function. n, Time constants before (after) illumination of each nanocrystal sample, found by a global fit of transient absorption spectra. Colours refer to those in Fig. 2g, h.