Tailoring Photoluminescence from Si-Based Nanocrystals Prepared by Pulsed Laser Ablation in He-N2 Gas Mixtures
In: Molecules Molecules, MDPI, 2020, 25 (3), pp.440. ⟨10.3390/molecules25030440⟩, Jg. 25 (2020-02-01), Heft 3, p 440
Online
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Zugriff:
Using methods of pulsed laser ablation from a silicon target in helium (He)-nitrogen (N2) gas mixtures maintained at reduced pressures (0.5&ndash
5 Torr), we fabricated substrate-supported silicon (Si) nanocrystal-based films exhibiting a strong photoluminescence (PL) emission, which depended on the He/N2 ratio. We show that, in the case of ablation in pure He gas, Si nanocrystals exhibit PL bands centered in the &ldquo
red - near infrared&rdquo
(maximum at 760 nm) and &ldquo
green&rdquo
(centered at 550 nm) spectral regions, which can be attributed to quantum-confined excitonic states in small Si nanocrystals and to local electronic states in amorphous silicon suboxide (a-SiOx) coating, respectively, while the addition of N2 leads to the generation of an intense &ldquo
green-yellow&rdquo
PL band centered at 580 nm. The origin of the latter band is attributed to a radiative recombination in amorphous oxynitride (a-SiNxOy) coating of Si nanocrystals. PL transients of Si nanocrystals with SiOx and a-SiNxOy coatings demonstrate nonexponential decays in the micro- and submicrosecond time scales with rates depending on nitrogen content in the mixture. After milling by ultrasound and dispersing in water, Si nanocrystals can be used as efficient non-toxic markers for bioimaging, while the observed spectral tailoring effect makes possible an adjustment of the PL emission of such markers to a concrete bioimaging task.
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Tailoring Photoluminescence from Si-Based Nanocrystals Prepared by Pulsed Laser Ablation in He-N2 Gas Mixtures
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Autor/in / Beteiligte Person: | Sergey V Antonenko ; Andrei V Muratov ; Anastasiya A Fronya ; Dombrovska, Yaroslava I. ; Kabashin, Andrei V. ; Kargin, N. I. ; Yury A Aleschenko ; Nikita V Karpov ; Sergey I Derzhavin ; Garmash, A. A. ; Victor Yu. Timoshenko ; Klimentov, S. M. ; Alexander Yu. Kharin ; The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia] ; P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] (LPI RAS) ; Russian Academy of Sciences [Moscow] (RAS) ; A. M. Prokhorov General Physics Institute (GPI) ; Lomonosov Moscow State University (MSU) ; Laboratoire Lasers, Plasmas et Procédés photoniques (LP3) ; Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU) ; Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS) |
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Zeitschrift: | Molecules Molecules, MDPI, 2020, 25 (3), pp.440. ⟨10.3390/molecules25030440⟩, Jg. 25 (2020-02-01), Heft 3, p 440 |
Veröffentlichung: | HAL CCSD, 2020 |
Medientyp: | unknown |
ISSN: | 1420-3049 (print) |
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