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https://www.sigmaaldrich.com/techni...ce/nanomaterials/quantum-dots.html#core-shell
Core shell quantum dots are nanoparticles consisting of a semiconductor core surrounded by a shell of another semiconductor material. They are typically several nanometers in size and have unique optical and electronic properties.
Fluorescence occurs when a material absorbs light at a certain wavelength and then re-emits light at a longer wavelength. In core shell quantum dots, the absorption of light causes electrons to move from the core to the shell, and when they return to the core, they emit light at a longer wavelength, resulting in fluorescence.
Core shell quantum dots have several advantages over traditional fluorescent dyes. They have a higher quantum yield, meaning they emit more light per absorbed photon, and they have a narrow emission spectrum, allowing for more precise detection. They are also more photostable, meaning they can be used for longer periods of time without degradation.
Core shell quantum dots are typically synthesized using a wet chemical method, where a precursor solution containing the core and shell materials is heated to form the nanoparticles. The size and properties of the quantum dots can be controlled by adjusting the reaction conditions, such as temperature and reactant concentrations.
Fluorescence from core shell quantum dots has a wide range of potential applications. They are commonly used as fluorescent probes for biological imaging, as they can be targeted to specific cells or tissues. They are also being investigated for use in solar cells, LED displays, and other optoelectronic devices.
