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Ultranarrow Luminescence Linewidth of Silicon Nanocrystals and Influence of Matrix
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.ORCID iD: 0000-0003-2562-0540
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.ORCID iD: 0000-0001-5304-913X
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2014 (English)In: ACS Photonics, ISSN 2330-4022, Vol. 1, no 10, 998-1005 p.Article in journal (Refereed) Published
Abstract [en]

The luminescence linewidth of individual silicon nanocrystals was characterized by single-dot spectroscopy, and an ultranarrow linewidth of similar to 200 mu eV at 10 K was found. This value is, in fact, limited by system resolution and represents only the upper limit of the homogeneous linewidth. In addition, the effect of the matrix was investigated for nanocrystals coated with organic ligands, embedded in silicon dioxide, as well as for nanocrystals with only a thin passivating layer. It was found that, depending on the matrix, the room-temperature bandwidth may vary by an order of magnitude, where values as small as similar to 12 meV (similar to 5 nm) at 300 K were detected for nanocrystals with a thin passivation. The observed values for silicon nanocrystals are similar and even surpass some of those for direct-band-gap quantum dots. The narrow linewidth at room temperature enables the use of silicon nanocrystals for nontoxic narrow-band labeling of biomolecules and for application as phosphors in white-light-emitting devices.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014. Vol. 1, no 10, 998-1005 p.
Keyword [en]
Silicon nanocrystals, photoluminescence, surface passivation, linewidth
National Category
Nano Technology Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-155787DOI: 10.1021/ph500221zISI: 000343276800013OAI: oai:DiVA.org:kth-155787DiVA: diva2:763445
Funder
Swedish Research CouncilCarl Tryggers foundation
Note

QC 20141114

Available from: 2014-11-14 Created: 2014-11-13 Last updated: 2015-03-25Bibliographically approved

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Sychugov, IlyaPevere, FedericoLinnros, Jan

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