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Quantum dot synthesis

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Uploaded on Aug 15, 2006

If you'll excuse the ridculously overdramatic soundtrack :) Synthesis of CdSe nanocrystals by injection of cadmium and selenium precursors into a high boiling point coordinating solvent at 360 degrees C. ~3nm particles of CdSe are initially generated. The intense color results from the quantum confinement effect on the electron as a result of the nanocrystal size being less than the Bohr radius of the exciton. Thus, as the particles grow larger, they become redder in color. A size series was generated by allowing the crystals to grow at 280C over a period of ~2 minutes. The visible spectrum from 515nm (green) to 650nm (red) was covered.

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