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Wednesday, October 02, 2013

Excitons in Semiconductor Nanocrystals: Science, Technology, and the Path to Market

Gomberg Physical Lecture
1640 Chemistry
4:00 pm - 5:30 pm

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Speaker:   Moungi Bawendi, Massachusetts Institute of Technology
Abstract:   Semiconductor nanocrystals, aka quantum dots, have become the prototypical material for the emergence of new properties when dimensions are reduced to the nanometer range. The size dependent properties of excitons and multiexcitons in quantum dots, coupled with a material that can be processed from solution, has led to applications in displays, solar energy conversion, and biological and biomedical fluorescence imaging, with products containing quantum dots for sale for research applications and in consumer devices. A fundamental understanding of excitonic processes is essential in any of these applications. Synthesis of well-characterized materials is also crucial, not only of the functional inorganic particle itself, but also the ligand shell that protects it and couples it chemically to molecules and matrices of interest. This talk will explore the chemistry and photophysics of nanocrystal quantum dots, dwelling on fundamental excitonic properties using both ensemble and single nanocrystal fluorescence spectroscopy studies. Examples of applications in color downshifting in displays and multispectral imaging and in biological imaging in vivo will be highlighted.