A complex study of the fast blue luminescence of oxidized silicon nanocrystals: the role of the core

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10271627" target="_blank" >RIV/00216208:11320/14:10271627 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/14:00428218
Result on the web
<a href="http://dx.doi.org/10.1039/c3nr06454a" target="_blank" >http://dx.doi.org/10.1039/c3nr06454a</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/c3nr06454a" target="_blank" >10.1039/c3nr06454a</a>

Result language
angličtina
Original language name
A complex study of the fast blue luminescence of oxidized silicon nanocrystals: the role of the core
Original language description
Silicon nanocrystals (SiNCs) smaller than 5 nm are a material with strong visible photoluminescence (PL). However, the physical origin of the PL, which, in the case of oxide-passivated SiNCs, is typically composed of a slow-decaying red-orange band (S-band) and of a fast-decaying blue-green band (F-band), is still not fully understood. Here we present a physical interpretation of the F-band origin based on the results of an experimental study, in which we combine temperature (4-296 K), temporally (picosecond resolution) and spectrally resolved luminescence spectroscopy of free-standing oxide-passivated SiNCs. Our complex study shows that the F-band red-shifts only by 35 meV with increasing temperature, which is almost 6 times less than the red-shift ofthe S-band in a similar temperature range. In addition, the F-band characteristic decay time obtained from a stretched-exponential fit decreases only slightly with increasing temperature. These data strongly suggest that the F-band arise
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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