Fig. 2.

Fluorescence decay curves and corresponding fits for four different NDs. The four graphs display measured fluorescence decay curves (blue) with corresponding fits (red) obtained from our model (see main text), showing excellent agreement. Note that the curves are normalised to their respective maximum. The different NDs exhibit increasingly faster photo-emission, with corresponding lifetimes of {25, 3.6, 2.2, 1.1} ns for ND#1–4. The shorter lifetimes correspond to larger collective domain sizes of N _max = {2, 7, 10, 50}, respectively (Supplementary Note 2)