D. S. Daibagya, O. V. Ovchinnikov, M. S. Smirnov, S. A. Ambrozevich, I. A. Zakharchuk, A. V. Osadchenko, A. S. Selyukov
{"title":"Temporal Dynamics of Exciton and Recombination Luminescence in CdTe/SiO2 (Core/Shell) Quantum Dots","authors":"D. S. Daibagya, O. V. Ovchinnikov, M. S. Smirnov, S. A. Ambrozevich, I. A. Zakharchuk, A. V. Osadchenko, A. S. Selyukov","doi":"10.1134/S0020168525700049","DOIUrl":null,"url":null,"abstract":"<p>In this paper, we report a study of the temporal dynamics of photoluminescence intensity in cadmium telluride quantum dots coated with a silicon dioxide shell under continuous optical illumination. Our results demonstrate that at least two mechanisms influence emission from CdTe/SiO<sub>2</sub> quantum dots. In the early stages of our experiments, the luminescence intensity in CdTe/SiO<sub>2</sub> quantum dots is observed to rise, whereas in the final stage luminescence photodegradation begins to prevail. The former mechanism, related to photoenhancement, is due to passivation of surface defects by water molecules and a decrease in the number of nonradiative recombination centers. The latter mechanism, related to photodegradation, can be accounted for by the photooxidation of the CdTe core under the effect of oxygen.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"60 11","pages":"1307 - 1312"},"PeriodicalIF":0.9000,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Materials","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1134/S0020168525700049","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
In this paper, we report a study of the temporal dynamics of photoluminescence intensity in cadmium telluride quantum dots coated with a silicon dioxide shell under continuous optical illumination. Our results demonstrate that at least two mechanisms influence emission from CdTe/SiO2 quantum dots. In the early stages of our experiments, the luminescence intensity in CdTe/SiO2 quantum dots is observed to rise, whereas in the final stage luminescence photodegradation begins to prevail. The former mechanism, related to photoenhancement, is due to passivation of surface defects by water molecules and a decrease in the number of nonradiative recombination centers. The latter mechanism, related to photodegradation, can be accounted for by the photooxidation of the CdTe core under the effect of oxygen.
期刊介绍：
Inorganic Materials is a journal that publishes reviews and original articles devoted to chemistry, physics, and applications of various inorganic materials including high-purity substances and materials. The journal discusses phase equilibria, including P–T–X diagrams, and the fundamentals of inorganic materials science, which determines preparatory conditions for compounds of various compositions with specified deviations from stoichiometry. Inorganic Materials is a multidisciplinary journal covering all classes of inorganic materials. The journal welcomes manuscripts from all countries in the English or Russian language.
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