Journal
OPTICS AND SPECTROSCOPY
Volume 115, Issue 5, Pages 651-659Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0030400X13110246
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Funding
- Ministry of Education and Science of the Russian Federation [14.V37.21.0248, 14.V37.21.1071]
- program of strategic development of the Voronezh State University for young researchers [PSR-MG/09-12]
- Russian Foundation for Basic Research [11-03-12140-ofi-m-2011]
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Using the spectral methods of induced absorption, luminescence, and photostimulated luminescence flash, we have experimentally investigated processes of decay of electronic excitations in CdS colloidal quantum dots and in CdS/ZnS core-shell systems synthesized in gelatin by the sol-gel method. It has been shown that the decay of electronic excitations in colloidal quantum dots of this type is predominantly related to a fast localization of nonequilibrium charge carriers on surface defects and their subsequent recombination during times on the order of units and tens of picoseconds. The passage to core-shell systems eliminates, to a large extent, surface defects of the core, some of which are luminescence centers. However, upon using the sol-gel synthesis, a noticeable fraction of luminescence centers are formed in the interior of the CdS quantum dot, which, as well as in the case of CdS/ZnS systems, ensures localization of exciton, blocks its direct annihilation, and maintains recombination radiation.
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