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Herein,we directly prepared white fluorescent CDs (W-CDs) using 1,6-dihydroxynaphthalene (1,6-DHN) and L-asparagine (L-ASn) as carbon sources through a simple solvent-free method.As-prepared W-CDs can be obtained in high yield (95％).A relative pure white LEDs (WLEDs) were fabricated with Commission lnternationale de L'Eclairage (CIE) coordinates of (0.32,0.31).As-prepared W-CDs will have promising future for a wide range of optoelectronic devices.