"Science and Technology of Semiconductor NanocrystalQuantum Dots"
Presented by Professor Moungi Bawendi, MassachusettsInstitute of Technology
Semiconductor nanocrystals, aka quantum dots, have becomethe prototypical material for the emergence of new properties when dimensionsare reduced to the nanometer range. In the case of nanocrystals quantum dots itis the exciton radius in the bulk that determines the size transition frombulk-like electronic behavior to the size dependent properties that have madequantum dots a popular nanomaterial. In the size range of ~2 to 10 nm, theelectronic structure of quantum dots becomes discrete at room temperature,leading to the size dependence of their band gap and of their fluorescence. Thesize dependent properties of excitons and multiexcitons in quantum dots,coupled with a material that can be processed from solution, has led topotential applications in fields that include emissive displays, solar energyconversion, and biological and biomedical fluorescence imaging. A fundamentalunderstanding of exciton processes is critical for any of these applications tobecome realized. Synthesis of well characterized materials is obviously key,not only of the functional inorganic particle itself, but also the ligand shellthat protects it and couples it chemically to molecules and matrices ofinterest. This talk will explore the chemistry and photophysics of nanocrystalquantum dots and then explore the fundamental properties and challenges behindbroadly applying quantum dots as light emitters and light absorbers in devicesand for biological imaging.
Hosted by the Chandler Undergraduate Chemistry Society
Thursday, April 8, 2010
Meet the speaker at 3:00pm in room 328 Havemeyer
Tea & Cookies at 4:00pm in 328 Havemeyer
Seminar at 4:30pm in 209 Havemeyer
