Extended Data Fig. 4: In-situ PL monitoring during the synthesis process.
a, Schematic diagram of the in-situ PL monitoring setup, in which 365 nm ultraviolet light is irradiated onto the sample, and the fluorescence signal is collected using a fiber-coupled spectrometer after the injection of cesium precursor. b, c Colour map of spectral evolution of the DSPA-QDs (b) and OA-QDs (c), where the arrows indicate the moment of HI injection. The DSPA-QDs show an obvious spectra blue shift after HI injection while the OA-QDs show no spectra change. Note: The in-situ measured PL spectrum shows a slight redshift compared with the PL spectrum collected in dilute QDs solution, which is caused by the reabsorption effects of the crude QDs solution with a high concentration.
