Fluorescent quantum dots are widely used in biomedical imaging due to their bright and stable fluorescence, enabling high-resolution tracking of cells and molecules in real time. They are applied in cancer research for tumor detection and imaging, as their tunable emission wavelengths allow for multiplexed imaging of multiple targets simultaneously. In diagnostics, they serve as sensitive probes in assays for detecting biomarkers, viruses, and pathogens. In optoelectronics, they are utilized in the development of high-efficiency displays and LEDs, offering vibrant colors and energy efficiency. Their use in solar cells enhances light absorption and energy conversion rates, improving overall performance. Additionally, they are employed in environmental monitoring to detect pollutants and toxins in water and air, providing rapid and accurate analysis. Their versatility and unique optical properties make them valuable across various scientific and industrial fields.