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- W2155934751 abstract "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 of the 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 arises from the core-related quasi-direct radiative recombination governed by slowly thermalizing photoholes." @default.
- W2155934751 created "2016-06-24" @default.
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- W2155934751 date "2014-01-01" @default.
- W2155934751 modified "2023-10-09" @default.
- W2155934751 title "A complex study of the fast blue luminescence of oxidized silicon nanocrystals: the role of the core" @default.
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- W2155934751 doi "https://doi.org/10.1039/c3nr06454a" @default.
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