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Proceedings Article

Isocrystalline core/shell synthesis of high quality II-VI diluted magnetic semiconductor quantum dots: ligand-field spectroscopic studies

[+] Author Affiliations
Pavle V. Radovanovic, Daniel R. Gamelin

Univ. of Washington (USA)

Proc. SPIE 4807, Physical Chemistry of Interfaces and Nanomaterials, 223 (November 1, 2002); doi:10.1117/12.452426
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From Conference Volume 4807

  • Physical Chemistry of Interfaces and Nanomaterials
  • Jin Z. Zhang; Zhong L. Wang
  • Seattle, WA | July 07, 2002

abstract

Ligand field electronic absorption spectroscopy has been applied as a direct probe of Co2+ dopant ions in II-VI based diluted magnetic semiconductor quantum dots. Synthesis of Co2+-doped CdS (Co2+:CdS) quantum dots by simple coprecipitation in inverted micelle solutions has been found to yield predominantly surface bound dopant ions, which are unstable with respect to solvation in a coordinating solvent (pyridine). The solvation kinetics are biphasic, involving two transient intermediates. In contrast, Co2+ ions are doped much more isotropically in ZnS QDs, and this difference is attributed to the similar ionic radii of Co2+ and Zn2+ ions (0.74 Å), as opposed to Cd2+ ions (0.97 Å). We have developed an isocrystalline core/shell synthetic methodology that enables us to synthesize high quality internally doped Co2+:CdS quantum dots. The effect of Co2+ binding on the surface energies of CdS and ZnS quantum dots is discussed and related to the growth mechanism of diluted magnetic semiconductor quantum dots.

© (2002) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Pavle V. Radovanovic and Daniel R. Gamelin
"Isocrystalline core/shell synthesis of high quality II-VI diluted magnetic semiconductor quantum dots: ligand-field spectroscopic studies", Proc. SPIE 4807, Physical Chemistry of Interfaces and Nanomaterials, 223 (November 1, 2002); doi:10.1117/12.452426; http://dx.doi.org/10.1117/12.452426


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