The Effect of Temperature on the Photoluminescence of Hybrid Si/SiO x Nanoparticles
Transformation of the photoluminescence (PL) spectra of hybrid Si/SiOx nanoparticles of the crystalline core–oxide shell type has been investigated in the temperature range of 10–320 K upon 325-nm laser excitation. Si/SiOx nanoparticles are synthesized from silicon monoxide and functionalized in dim...
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Published in | Nanotechnologies in Russia Vol. 14; no. 1; pp. 82 - 89 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Heidelberg
Springer Nature B.V
01.01.2019
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Subjects | |
Online Access | Get full text |
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Summary: | Transformation of the photoluminescence (PL) spectra of hybrid Si/SiOx nanoparticles of the crystalline core–oxide shell type has been investigated in the temperature range of 10–320 K upon 325-nm laser excitation. Si/SiOx nanoparticles are synthesized from silicon monoxide and functionalized in dimethyl sulfoxide (DMSO) or octadecene (OD). The PL spectra of the nanoparticles are considered as superpositions of short-wavelength (400–550 nm) and long-wavelength (600–900 nm) bands, which have significantly different ratios of the total intensities of these components in Si/SiOx/OD and Si/SiOx/DMSO samples. For Si/SiOx/DMSO samples, the intensity of the short-wavelength band monotonically decreases with an increase in temperature from 10 K, whereas the intensity of the long-wavelength band first increases; however, then (at approximately 70 K) its slope begins to decrease and levels off. The specific features of the temperature dependence of the long-wavelength PL band intensity can be explained in this case by efficient energy transfer from defect oxygen-containing centers at the core boundary to exciton centers that arise under laser irradiation. In the case of Si/SiOx/OD particles, for which the short-wavelength band intensity is initially low, this effect is not observed. For these particles, the influence of 405-nm cw laser radiation on the kinetics of changes in the intensity of the long-wavelength PL band has been studied beginning with a temperature of 10 K. It has been found that the PL intensity increases at temperatures near 10 K with an increase in the exposure time, which is explained by additional heating of nanoparticles in a vacuum. |
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ISSN: | 1995-0780 1995-0799 |
DOI: | 10.1134/S1995078019010099 |