Fluorescent quantum dots are widely used in biological imaging due to their bright and stable fluorescence. They enable high-resolution tracking of cellular processes and molecular interactions in real-time. In medical diagnostics, they serve as sensitive probes for detecting diseases at early stages, such as cancer biomarkers. Their tunable emission wavelengths allow multiplexed detection, where multiple targets can be identified simultaneously. In optoelectronics, they enhance the performance of devices like LEDs and solar cells by improving light absorption and emission efficiency. Additionally, they are utilized in security inks for anti-counterfeiting measures due to their unique optical properties.