SHAP summary plot for the XGB model, identifying the impact of synthesis parameters on red fluorescence intensity. Value of the feature represented from low (blue) to high (red). Donor: low, Fe 2 O 3; high, CuO. Precursor: low, N -acetylglucosamine; medium low, glucose; medium, galactose; medium high, glucosamine; high, toluenesulfonic acid. Laser power: eight values from low (31 mW) to high (129 mW) (Supplementary Fig. 16). Concentration: low, 50 mg ml −1; low medium, 100 mg ml −1; high medium, 200 mg ml −1; high, 300 mg ml −1. Laser focus: low, 4.62 mm; high, 4.32 mm. Laser speed: low, 30 mm s −1; low medium, 50 mm s −1; high medium, 100 mm s −1; high, 150 mm s −1. Additives (orange): low, no additive; high, with additive. PVP, polyvinylpyrrolidone.
