Bimodal Bond-Length Distributions in Cobalt-Doped CdSe, ZnSe, and Cd1-xZnxSe Quantum Dots
Journal of the American Chemical Society2007Vol. 129(13), pp. 3973–3978
Citations Over TimeTop 10% of 2007 papers
Abstract
Electronic absorption spectroscopy has been used to study changes in Co2+ ligand-field parameters as a function of alloy composition in Co2+-doped Cd(1-x)Zn(x)Se nanocrystals. A shift in the energy of the 4T1(P) excited-state with alloy composition is observed. Analysis reveals that Co2+-Se2- bond lengths change relatively little as the host is varied continuously from CdSe to ZnSe, generating a large difference between microscopic and average cation-anion bond lengths in Co2+-doped CdSe nanocrystals but not in Co2+-doped ZnSe nanocrystals. The bimodal bond-length distributions observed here are shown to cause a diameter-dependent enthalpic destabilization of doped semiconductor nanocrystals.
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