Luminescence of colloidal CdSe/ZnS nanoparticles: high sensitivity to solvent phase transitions

We investigate nanosecond photoluminescence processes in colloidal core/shell CdSe/ZnS nanoparticles dissolved in water and found strong sensitivity of luminescence to the solvent state. Several pronounced changes have been observed in the narrow temperature interval near the water melting point. Fi...

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Bibliographic Details
Published in:Nanoscale research letters 2011-02, Vol.6 (1), p.142-142, Article 142
Main Authors: Antipov, Andrei, Bell, Matt, Yasar, Mesut, Mitin, Vladimir, Scharmach, William, Swihart, Mark, Verevkin, Aleksandr, Sergeev, Andrei
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Materials Science
Molecular Medicine
Nano Express
Nanochemistry
Nanoscale Science and Technology
Nanotechnology
Nanotechnology and Microengineering
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Summary:We investigate nanosecond photoluminescence processes in colloidal core/shell CdSe/ZnS nanoparticles dissolved in water and found strong sensitivity of luminescence to the solvent state. Several pronounced changes have been observed in the narrow temperature interval near the water melting point. First of all, the luminescence intensity substantially (approximately 50%) increases near the transition. In a large temperature scale, the energy peak of the photoluminescence decreases with temperature due to temperature dependence of the energy gap. Near the melting point, the peak shows N-type dependence with the maximal changes of approximately 30 meV. The line width increases with temperature and also shows N-type dependence near the melting point. The observed effects are associated with the reconstruction of ligands near the ice/water phase transition.
ISSN:1556-276X
1931-7573
1556-276X
DOI:10.1186/1556-276X-6-142