Experimental synthesis of dual-emission carbon dots: The role of reaction temperature

Dual-emission carbon dots (DE-CDs) have attracted significant attention from scientists owing to their excellent optical properties. However, the synthesis method is complicated, time-consuming, and frequently uses haz-ardous precursors. Herein, we present a facile method for the synthesis of DE-CDs from environmentally friendly precursors and study the effect of the reaction temperature on the morphology and optical properties of DE-CDs. The prepared samples exhibited two emission peaks at 430 and 520 nm with a large full width at half maximum (FWHM). The change in reaction temperature resulted in an enormous change in the morphology and fluores-cence properties of DE-CDs. Notably, the intensity ratio between the main peak at 430 nm and the sub-peak at 520 nm can be manipulated by varying the reaction temperature, which is beneficial for manufacturing single -component white LEDs, ratiometric sensors, bioimaging, etc.