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Type: Artigo de periódico
Title: Rare earth doped silicon nanocrystals derived from an erbium amidinate precursor
Author: Ji, JM
Senter, RA
Tessler, LR
Back, D
Winter, CH
Coffer, JL
Abstract: We describe the use of Er(tBuNC(CH3)NtBu)(3) as a dopant source in the preparation of silicon nanocrystals, particularly as regards their observed structure, composition, and photophysical properties. These nanocrystals were prepared by the co-pyrolysis of Er(tBuNC(CH3)NtBu)(3) and disilane in a dilute helium stream at 1000 degreesC. Characterization methods include high resolution electron microscopy, selected area electron diffraction, energy dispersive x-ray measurements, extended x-ray absorption spectroscopy, and photoluminescence spectroscopy. In conditions identical to those used previously for beta-diketonate precursors, nanocrystals doped using this amidinate source are larger in size, of a narrower size distribution, and contain more erbium in the nanocrystal on average. Steady state photoluminescence measurements as a function of excitation wavelength confirm that the characteristic 1540 nm emission detected in these nanocrystals emit by a silicon exciton-mediated pathway. These results are a clear example of precursor dopant chemistry exerting a significant effect on resultant nanoparticle properties.
Country: Inglaterra
Editor: Iop Publishing Ltd
Rights: fechado
Identifier DOI: 10.1088/0957-4484/15/5/041
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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