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01.11.2017 | Research Paper

Decay of electronic excitations in colloidal thioglycolic acid (TGA)-capped CdS/ZnS quantum dots

verfasst von: M. S. Smirnov, O. V. Buganov, S. A. Tikhomirov, O. V. Ovchinnikov, E. V. Shabunya-Klyachkovskaya, I. G. Grevtseva, T. S. Kondratenko

Erschienen in: Journal of Nanoparticle Research | Ausgabe 11/2017

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Abstract

Investigations of dynamics of exciton relaxation in colloidal thioglycolic acid (TGA)-capped CdS/ZnS core/shell systems with diameter of 3.6 nm by means of femtosecond transient absorption spectroscopy, thermostimulated luminescence (TSL), and decay of luminescence are presented in this paper. It was found that the intensity of trap-state luminescence increases when one and two ZnS monolayers are formed. Also, the lifetime of trap-state luminescence increases. Two types of trap states with different depths were found, using thermostimulated luminescence technique. Localized states of the first type with depth of 0.085 eV do not change their concentration during sell formation. In contrast, trap state of the second type with depth of 0.125 eV are almost completely removed. It was found that the electron lifetime, investigated femtosecond transient absorption is not changed during formation of ZnS shell. It was concluded that localized states are channels of non-radiative recombination, direct quenching the center of trap-state luminescence. The absence of exciton luminescence is caused by rapid localization of holes at luminescence center.

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Nächster Artikel Thermosensitive polymer stabilized core-shell AuNR@Ag nanostructures as “smart” recyclable catalyst

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Titel: Decay of electronic excitations in colloidal thioglycolic acid (TGA)-capped CdS/ZnS quantum dots
verfasst von: M. S. Smirnov
O. V. Buganov
S. A. Tikhomirov
O. V. Ovchinnikov
E. V. Shabunya-Klyachkovskaya
I. G. Grevtseva
T. S. Kondratenko
Publikationsdatum: 01.11.2017
Verlag: Springer Netherlands
Erschienen in: Journal of Nanoparticle Research / Ausgabe 11/2017
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-017-4067-4

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