Fluorescence/phosphorescence dual emissive, single-component dual state (solid/liquid) white-lighting-emission CDs from one precursor-based solvent-free technique

Abstract

Single component and one precursor based white-light carbon dots (SO-WCDs) from solvent-free technique are tremendous potential in white light LED(WLED) lighting. However, no relating work is reported up to now. Using N, N′-methylenebisacrylamide (MBA) as only precursor, we achieved, for the first time, the SO-WCDs by the solvent-free technique. Our SO-WCDs exhibit impressively fluorescent/phosphorescent dual emission and warm (in solid state)/cold (in liquid state) dual mode white light. The warm white light has a low correlated color temperature (CCT = 3765 K) and high color rendering index (CRI = 90.6), making it suitable for natural light-like WLEDs. Based on control experiments and instrumental analysis, it is proposed that the warm white light originated from synergistical contribution of the inherent fluorescence from carbon cores, the red shifted fluorescence from aggregation-induced effect (AIR) and the phosphorescence from carbon cores, while the cold white light from the inherent fluorescence from carbon cores and the red shifted fluorescence from AIR. Our work has provided a new solution for cold/warm white lighting production and further promoted the rapid and large-scale industrial preparation of the single-component white CDs.