Silicon nanocrystals as fast and efficient light emitters for optical gain |
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Authors: | Kateřina Kůsová |
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Institution: | Institute of Physics of the Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00 Prague 6, Czech Republic;Nagoya University;Hokkaido University;Tokyo Institute of Technology;Gifu University;Hiroshima University |
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Abstract: | Light-emission and optical gain in a silicon-based material is an intensely studied scientific topic due to its possible application impact. In this article, we study colloidal dispersion of silicon nanocrystals with methyl-based capping. Excellent optical properties of this material include reasonably high luminescence quantum yield (20%) and fast radiative lifetime (10 ns), comparable to direct-bandgap semiconductors. Moreover, luminescence maximum situated in the yellow spectral region (570 nm) indicates lowered free-carrier absorption. Photoluminescence and FTIR measurements combined with ultrafine filtration show that the nanocrystals are dispersed in the solvent as single particles or small clusters, implying that scattering-related losses are also nearly eliminated. |
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