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

Author(s): Antipov Andrei | Bell Matt | Yasar Mesut | Mitin Vladimir | Scharmach William | Swihart Mark | Verevkin Aleksandr | Sergeev Andrei

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 6;
Issue: 1;
Start page: 142;
Date: 2011;
Original page

Abstract 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.

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