Doping enables precise control of band gaps, shifting emission wavelengths for tailored optical properties. It can introduce magnetic and conductive traits, expanding quantum dots' use in spintronics and advanced sensors. Additionally, doping can reduce toxicity by replacing harmful elements, making quantum dots safer for biomedical and environmental applications.

Overall, doping quantum dot nanoparticles allows researchers to tailor their physical, chemical, and optical properties to better meet the demands of various technological applications, making them versatile materials in nanotechnology.

The doping in bulk materials has direct and measurable control on properties of materials. When we get quantum dot nano-particles, we basically get additional control by changing size. It becomes very interesting to see the relative control due to size and due to external doping in nano-particles. Hence we get even more precise control and applications, namely size dependence and external doping