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Photoluminescence of pure silicon quantum dots embedded in amorphous silica wire array

Abstract

Silicon quantum dots (SiQDs) with a mean diameter of 3.9 nm, smaller than the excitonic Bohr radius of silicon, were obtained by a simple and low-cost high temperature decomposition method using Si and O as starting elements without the addition of dopants, surfactants and ligands. These SiQDs were embedded in the highly oriented and fairly long amorphous silica wire array with the diameter of 500 nm and the length up to 2.5 mm. The corresponding Raman peak of the as-prepared products was downshifted and asymmetric broadened, which was attributed to the effect of phonon confinement and may be quantitatively verified with the diameter distribution of SiQDs by a theoretical method. The pure SiQDs, emitting photoluminescence of 800 and 1550 nm at room temperature, were only covered with silica, which may be served as a model to investigate the nature and emission mechanism of SiQDs. These visible and infrared emissions would originate from the intrinsic defects in the SiQDs, suggesting opportunities for developing cheap and novel types of silicon-based optical and waveguide devices in the future.

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Publication details

The article was received on 16 Mar 2017, accepted on 13 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01117B
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Photoluminescence of pure silicon quantum dots embedded in amorphous silica wire array

    S. Lu, B. Wu, Y. Sun, Y. Cheng, F. Liao and M. Shao, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01117B

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