“…Further purification by silica gel column chromatography improved the PLQY to 64%. 27 The GQDs also exhibited negative fluorescence solvatochromism, showing blue fluorescence in highly polar solvents and green fluorescence in less polar solvents. 26 Despite the narrow fwhm, high PLQY, and multicolor luminescence achieved, the low product yield (PY) of dialysis-purified GQDs, 3%, remains a problem in the synthesis of GQDs in an open system using PG as a carbon source.…”