Synthesis and Photoelectric Properties of Nitrogen‐ and Phosphorus‐Doped Carbon Quantum Dots

Herein, nitrogen‐ and phosphorus‐doped carbon quantum dots (CQDs) are synthesized using a one‐step hydrothermal method that uses glucose and diammonium phosphate as the main raw material to improve bottleneck problems, such as low yield of fluorescent quantum, short‐emission wavelength, and the poor photoelectrical performance of CQDs. The optimal synthesis conditions are found to be a duration of 10 h, optimal synthesis temperature of 240 °C, and optimal raw material ratio of glucose: diammonium phosphate as 3:0.5. The shape, composition, optical properties, and electrochemical properties of the nitrogen‐ and phosphorus‐doped CQDs (N,P‐CQDs) are characterized and studied by means of instruments. The experimental results show that the N,P‐CQDs prepared following the hydrothermal method using glucose and diammonium phosphate as the main raw material produce a higher fluorescence quantum yield (41.7%), longer‐emission wavelength (470 nm), and better photoelectric properties, expanding the applicability of N,P‐CQDs in the field of life science.