Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals

Turyanska, L and Hill, R. J. A. and Makarovsky, O. and Moro, F. and Knott, A. N. and Larkin, O. J. and Patane, A. and Meaney, A. and Christianen, P. C. M. and Fay, M. W. and Curry, R. J. (2014) Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals. Nanoscale, 6 (15). pp. 8919-8925. ISSN 2040-3364

Full content URL: http://dx.doi.org/10.1039/c4nr02336f

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Abstract

We report on PbS colloidal nanocrystals that combine within one structure solubility in physiological solvents with near-infrared photoluminescence, and magnetic and optical properties tuneable by the controlled incorporation of magnetic impurities (Mn). We use high magnetic fields (B up to 30 T) to measure the magnetization of the nanocrystals in liquid and the strength of the sp-d exchange interaction between the exciton and the Mn-ions. With increasing Mn-content from 0.1 to 7, the mass magnetic susceptibility increases at a rate of �10-7 m3 kg-1 per Mn percentage; correspondingly, the exciton g-factor decreases from 0.47 to 0.10. The controlled modification of the paramagnetism, fluorescence and exciton g-factor of the nanocrystals is relevant to the implementation of these paramagnetic semiconductor nanocrystals in quantum technologies ranging from quantum information to magnetic resonance imaging. This journal is © the Partner Organisations 2014.

Keywords:Excitons, Magnetic resonance imaging, Magnetic susceptibility, Nanocrystals, Paramagnetism, Quantum optics, Colloidal nanocrystals, Controlled modification, Magnetic and optical properties, Near-infrared photoluminescence, Paramagnetic susceptibility, Quantum technologies, Semiconductor nanocrystals, Sp-d Exchange interaction, Manganese, JCOpen
Subjects:F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Chemistry
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ID Code:22511
Deposited On:20 Mar 2016 17:38

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