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

Pavle V. Radovanovic; Daniel R. Gamelin

doi:10.1117/12.452426

15 November 2002 Isocrystalline core/shell synthesis of high quality II-VI diluted magnetic semiconductor quantum dots: ligand-field spectroscopic studies

Pavle V. Radovanovic, Daniel R. Gamelin

Author Affiliations +

Proceedings Volume 4807, Physical Chemistry of Interfaces and Nanomaterials; (2002) https://doi.org/10.1117/12.452426
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

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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, (15 November 2002); https://doi.org/10.1117/12.452426

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