Carbon dots (CDs) have gained significant attention in recent years as a next-generation fluorescent material, owing to their unique optical properties, excellent biocompatibility, low toxicity, and ease of synthesis. These nanoscale carbon-based materials offer an environmentally friendly and cost-effective alternative to traditional semiconductor quantum dots and organic dyes. One of the most effective ways to tailor and enhance the photoluminescence of carbon dots is through heteroatom doping, particularly with elements such as nitrogen, which can significantly improve their quantum yield...