Double shell nano-particles, or better known as quantum dots have a very unique and uniform ability to fluoresce under UV light. This project studied the fluorescent properties of CdSe/ZnSe/ZnS quantum dots, and how those properties changed when an Mn dopant was introduced. The dots were grown and synthesized at temperatures above 190°C. Quantum dots have the ability to change wavelengths depending on how long they are grown at those high temperatures. Three different types of quantum dots were observed. The first set was the undoped CdSe/ZnSe/ZnS dots, second was with a doped ZnSe subshell and the final stage was the doped outer ZnS shell. For each quantum dot, the UV-Vis spectrometer and the fluorimeter were used to observe spectral shifts. Double shell quantum dots are more stable, and have a smaller chance of oxidizing under UV light. Manganese is used as a parallel to test whether or not other molecules can attach onto different shells of the quantum dot.

Double shell CdSe/ZnSe/ZnS nanoparticle spectral shifts before and after a manganese dopant is introduced

249th National Meeting (2015)

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