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• W2087217529 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." @default.
• W2087217529 created "2016-06-24" @default.
• W2087217529 creator A5000898453 @default.
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• W2087217529 date "2012-07-12" @default.
• W2087217529 modified "2023-09-25" @default.
• W2087217529 title "Power-dependent spectral shift of photoluminescence from ensembles of silicon nanocrystals" @default.
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• W2087217529 doi "https://doi.org/10.1186/1556-276x-7-389" @default.
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