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- W2907858910 abstract "In this work the temperature-dependent photoluminescence of alkyl-capped silicon nanocrystals with mean diameters of between 3 and 9 nm has been investigated. The nanocrystals were characterized extensively by FTIR, TEM, powder XRD, and X-ray photoelectron spectroscopy prior to low-temperature and time-resolved photoluminescence spectroscopy experiments. The photoluminescence (PL) properties were evaluated in the temperature range of 41-300 K. We found that the well-known temperature-dependent blueshift of the PL maximum decreases with increasing nanocrystal diameter and eventually becomes a redshift for nanocrystal diameters larger than 6 nm. This implies that the observed shifts cannot be explained solely by band-gap widening, as is commonly assumed. We propose that the luminescence of drop-cast silicon nanocrystals is affected by particle ensemble effects, which can explain the otherwise surprising temperature dependence of the luminescence peak." @default.
- W2907858910 created "2019-01-11" @default.
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- W2907858910 date "2019-01-31" @default.
- W2907858910 modified "2023-10-17" @default.
- W2907858910 title "Ensemble Effects in the Temperature-Dependent Photoluminescence of Silicon Nanocrystals" @default.
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- W2907858910 doi "https://doi.org/10.1002/chem.201804986" @default.
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