Fig. 4: Optical properties of 2D platelets with various defect densities.

a UV-vis absorption and fluorescence spectra under emission at 380 nm of 2D platelets assembled with varying molar ratios of 1 to 2. b Correlation between defect density and the FQY of the 2D platelets. c Correlation between defect density and the fluorescence decay curves of the 2D platelets. d Correlation between defect density and the fluorescence lifetime of the 2D platelets.