Nitrogen‐Oxygen Co‐Functionalized Waste Cassava Peel‐Derived Carbon Dots for White Led

Abstract White light emitting diodes (WLEDs) are most sought after, with the broad spectra ranging from cool to warm white light being skillfully utilized to create various modes of lighting effects. The fabrication of WLEDs is generally sophisticated, involving either multiple components emitting in different regions or single‐component phosphors with complex elemental compositions. In the present work, WLEDs utilizing solvent‐tuned carbon dots derived from waste cassava peel are reported through a facile one‐step microwave‐assisted solvothermal method. The carbon dots show evident UV absorption and correspondingly emit broad visible light spectra when dispersed in a dimethylformamide (DMF)‐polyvinyl alcohol (PVA) blend, making themselves suitable white light–emitting down conversion materials. The successful transformation of a 400 nm UV LED into a WLED with a general colour rendering index (CRI) of 83 and colour correlation temperature (CCT) of 4426 K gives a promising future outlook toward developing eco and economic‐friendly WLEDs.