Dual emission in doped core-shell nanocrystals Daniel R. Gamelin, University of Washington, DMR 0906814. We are developing new intermediate-gap doped semiconductor nanocrystals with unique electronic, magnetic, and magneto-optical properties.
TEM image and schematicillustration of a core-shell QD
Temperature-dependentemission of core/shellQDs.ThephotographsshowtheseQDsunderUV irradiation at two different temperatures.
Schematic of theelectronicstructureleading to excitonstorage. After excitation (hn), theexcitedstatepopulationevolves via variouskineticprocesses, denotedbytheir rate constants, k.TtheBoltzmannpopulationdistributionisdepicted to the right.
Article DOI: 10.1021/nl102135k
This research is being conducted by University of Washington graduate and undergraduate students collaborating with researchers from Germany, Canada, and the Netherlands. Participating students are learing skills that transcend the traditional borders of chemistry, physics, and materials science.
The picture at left shows undergraduate Rob Johns and graduate student Vlad Vlaskin preparing to analyze the temperature dependence of recently synthesized dual-emitting nanoparticles by luminescence spectroscopy.