Luminescence Degradation Mechanisms in CdS/ZnSe Colloidal Nanocrystals

The results of the study of one-photon processes of optically induced degradation of photoluminescence intensity of CdS/ZnSe nanocrystals are presented, and mechanisms of this degradation are determined. It is shown that the nanocrystal photodegradation process consists of three components. The firs...

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Published inBulletin of the Lebedev Physics Institute Vol. 47; no. 6; pp. 185 - 189
Main Authors Zabolotskii, M. S., Katsaba, A. V., Ambrozevich, S. A., Vitukhnovskii, A. G., Vasil’ev, R. B.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.06.2020
Springer Nature B.V
Subjects
Activation
Augers
Chemical bonds
Colloiding
Nanocrystals
Oleic acid
Photodegradation
Photoluminescence
Physics
Physics and Astronomy
surface states
quantum dots
CdS/ZnSe
photodegradation
semiconductor colloidal nanocrystals
Auger recombination
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Summary:The results of the study of one-photon processes of optically induced degradation of photoluminescence intensity of CdS/ZnSe nanocrystals are presented, and mechanisms of this degradation are determined. It is shown that the nanocrystal photodegradation process consists of three components. The first degradation component is caused by Auger recombination activation in photoinduced hole trapping by the trap associated with a surface state; a long-term degradation component can be associated with thermally activated chemical bond breaking between a passivating ligand, i.e., oleic acid, and the nanocrystal surface followed by nonradiative recombination channel activation.
ISSN:1068-3356
1934-838X
DOI:10.3103/S1068335620060020