4.7 Article

Effects of K+ and Na+ ions on the fluorescence of colloidal CdSe/CdS and CdSe/ZnS quantum dots

Journal

SENSORS AND ACTUATORS B-CHEMICAL
Volume 155, Issue 2, Pages 823-830

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.01.055

Keywords

Colloidal quantum dots (QDs); Fluorescence properties of QDs; Electron and hole confinements in QDs; Effects of K+ and Na+ ions

Funding

  1. Swedish Foundation for Strategic Research
  2. Swedish Vinnova [P35914-1]
  3. Swedish National Infrastructure for Computing (SNIC) [001-09-52]

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In this work we studied the effects of K+ and Na+ ions on fluorescence properties of the colloidal quantum dots (QDs). It was found that the fluorescence intensity was enhanced when low concentration of ions was introduced to QD solutions, while it became weakened when ion concentrations reached their physiological levels in many bio environments. Such fluorescence changes can be attributed to interactions between QD surface ligands and ions as well as the Coulomb potential of ions that displaces the wave functions of the electron and hole confined inside the QD. These results are important for understanding the influence of different biological environments, such as extracellular and intracellular compartments, on optical properties of colloidal QDs. (C) 2011 Elsevier B.V. All rights reserved.

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