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À propos de : Synthesis and Characterization of Discrete LuminescentErbium-Doped Silicon Nanocrystals        

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  • Synthesis and Characterization of Discrete LuminescentErbium-Doped Silicon Nanocrystals
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  • The preparation of discrete erbium-doped silicon nanoparticles prepared by the co-pyrolysis of disilaneand the volatile complex Er(tmhd)3 (tmhd = 2,2,6,6-tetramethyl-3,5-heptanedionato) is described. Thenanoparticles were characterized by transmission electron microscopy, selected area electron diffraction, X-raydispersive spectroscopy, photoluminescence, and UV−visible absorption spectroscopies. Erbium-doped siliconnanoparticles possess a distinctive dark contrast in the transmission electron microscope, and the presence oferbium is confirmed by X-ray energy dispersive spectroscopy. The mean diameter of the nanoparticle aggregatescan be shifted by altering the length of the pyrolysis oven employed. Chacteristic Er3+ near-infraredphotoluminescence at 1540 nm is detected in these doped nanoparticles; preliminary excitation and powerdependence measurements of this luminescence suggest a carrier-mediated emission mechanism.
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