High-Performance green fluorescent carbon Dots: Synthesis, Properties, and applications in temperature Sensing, and information anti-counterfeiting

Abstract

Carbon dots (CDs) possess advantages such as high fluorescence quantum yield and non-toxicity, making them one of the most promising luminescent nanomaterials for anti-counterfeiting applications. In this research, a high-performance green fluorescent carbon dot (G-CDs) was successfully synthesized via a solvothermal method using m-Phenylenediamine and phosphoric acid as precursors. The synthesized G-CDs exhibit remarkable optical properties, with a maximum excitation wavelength of 439 nm and a maximum emission wavelength of 507 nm, accompanied by an impressive quantum yield of 30.92 %. G-CDs demonstrate exceptional stability, retaining their fluorescence characteristics under various environmental conditions, including light exposure, temperature fluctuations, different pH values, and salt concentrations. We further explored the potential applications of G-CDs in fluorescent anti-counterfeiting inks, and temperature sensing.