Abstract
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.
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ACKNOWLEDGMENTS
The authors are grateful to A.S. Selyukov for helpful discussion of the results.
Funding
This work (spectroscopic studies) was supported by the Russian Science Foundation, project no. 17-72-20088 and degradation measurements) by the Russian Foundation for Basic Research, project no. 18-02-00653_a.
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Translated by A. Kazantsev
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Zabolotskii, M.S., Katsaba, A.V., Ambrozevich, S.A. et al. Luminescence Degradation Mechanisms in CdS/ZnSe Colloidal Nanocrystals. Bull. Lebedev Phys. Inst. 47, 185–189 (2020). https://doi.org/10.3103/S1068335620060020
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DOI: https://doi.org/10.3103/S1068335620060020