pH-Responsive Mn-Doped Carbon Dots for White-Light-Emitting Diodes, Fingerprinting, and Bioimaging

In recent years, the tunable fluorescence emissive carbon dots (CDs) enrich the efficacy and importance via the incorporation of two or more applications. Herein, we report a pyromellitic acid-based pH-responsive multicolor emissive (orange and green) manganese doped CDs. The mechanism behind the tunable fluorescence properties at high pH is proposed based upon the detailed optical and physicochemical study. The result showed that the blue shifts are highly associated with the COO moieties on the surface. Afterward, we have expanded the applications of the synthesized CDs in a white-light-emitting diode (WLED), fingerprinting, fluorescent ink, and bioimaging.