Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 429831
Title Photophysics of n-Butyl-Capped Silicon Nanoparticles
Author(s) Siekierzycka, J.R.; Rosso-Vasic, M.; Zuilhof, H.; Brouwer, A.M.
Source The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces 115 (2011)43. - ISSN 1932-7447 - p. 20888 - 20895.
DOI http://dx.doi.org/10.1021/jp2055156
Department(s) Laboratory for Organic Chemistry
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) cdse quantum dots - semiconductor nanocrystals - si nanocrystals - porous silicon - optical-transitions - light-emission - dark exciton - luminescence - photoluminescence - fluorescence
Abstract The photophysical properties are described of silicon nanoparticles protected with a shell of n-butyl chains, and with an asymmetric size distribution with a peak between 2 and 3 nm, and a tail extending up to 7 nm. The excited nanoparticles decay via multi-exponential luminescence on a time scale of a few nanoseconds. Longer-lived nonluminescent dark states were observed by nanosecond transient absorption spectroscopy. The average lifetime of the luminescent excited states increased somewhat with increasing wavelengths of excitation and emission. The nanosecond transient absorption spectra shifted to longer wavelengths with time. Probably, these observations are related to the size distribution of the particles: larger particles are excited at longer wavelength, emit at longer wavelength, and have longer-lived and red-shifted nanosecond transient absorption spectra. Two-photon excited luminescence showed broader emission spectra than one-photon excited luminescence at the same excitation energies. The two-photon cross-sections were found to be surprisingly small.
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