Ultrabroad-band, red sufficient, solid white emission from carbon quantum dot aggregation for single component warm white light emitting diodes with a 91 high color rendering index.

An ultrabroad-band solid white emission from carbon quantum dot aggregation with a full width at half maximum over 200 nm throughout the entire visible light window and, even better, with a sufficient red component is first reported. UV pumped WLEDs are fabricated by integrating phosphors onto a UV-LED chip, and they show favorable warm white light characteristics with CIE coordinates of (0.42, 0.38) and a 91 high color rendering index.