NDLI: Power-dependent spectral shift of photoluminescence from ensembles of silicon nanocrystals.

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Power-dependent spectral shift of photoluminescence from ensembles of silicon nanocrystals.

Content Provider	Europe PMC
Author	Timmerman, Dolf Gregorkiewicz, Tom
Copyright Year	2012
Abstract	Nanocrystals are widely studied for their tunable optical properties, most importantly increased luminescence efficiency and emission energy. Quantum confinement effects are found for many different types of nanocrystals, and these introduce a relation between the emission wavelength and the size of nanocrystals. When ensembles of nanocrystals with a distribution of sizes are studied, this can have profound effects on their luminescence spectra. Here, we show how photoluminescence spectra of ensembles of silicon nanocrystals can shift under different excitation conditions, resulting from differences in absorption cross-section of the individual nanocrystal sizes. This effect, together with the fact that after a pulsed excitation a silicon nanocrystal can only emit a single photon, determines how the distribution of excited nanocrystals changes and leads to the spectral shift for different excitation powers. Next to this effect, the influence of different radiative rates in such ensembles is also addressed. These notions are important for the interpretation of photoluminescence data for silicon nanocrystals but can be extended to any nanoparticle system comprising size-distributed ensembles.
ISSN	19317573
Journal	Nanoscale Research Letters
Volume Number	7
PubMed Central reference number	PMC3466130
Issue Number	1
PubMed reference number	22788829
e-ISSN	1556276X
DOI	10.1186/1556-276x-7-389
Language	English
Publisher	Springer
Publisher Date	2012-07-12
Access Restriction	Open
Rights License	This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Copyright ©2012 Timmerman and Gregorkiewicz; licensee Springer.
Subject Keyword	Nanocrystals Silicon nanocrystal ensemble Photoluminescence
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Condensed Matter Physics Materials Science

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