Optical absorption and photoluminescence studies of free-standing porous silicon films with high porosities

Article Abstract:

Noncollapsed free-standing porous silicon (PS) films with more than 90% porosity rate may be created through a combination of electrochemical etching techniques, including supercritical drying, electropolishing and chemical dissolving. It was found that PS films with relatively low porosities possess a linear function photon energy comparable with that of indirect gap semiconductors. On the other hand, PS films with high porosity tend to manifest increased photoluminescence intensity.

Analysis, Monomolecular films, Porosity

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Surface morphology dependent photoluminescence from colloidal silicon nanocrystals

Article Abstract:

Monodisperse 1-2 nm silicon nanocrystals are synthesized in reverse micelles and have their surfaces capped with either allylamine or 1-heptene to produce either hydrophilic or hydrophobic silicon nanocrystals. Optical characterization is performed on colloidal solutions with the two types of surface-capped silicon nanocrystals with identical size distributions.

Micelles

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Environmental effects on photoluminescence of highly luminescent CdSe and CdSe/ZnS core/shell nanocrystals in polymer thin films

Article Abstract:

The systematic studies of the photoluminescence (PL) properties, such as wavelength shift, PL line width, and PL intensity from colloidal CdSe NCs, embedded in acoustic and electronic highly insulating polymer thin films, are presented. Bare-core CdSe NCs and CdSe/ZnS core/shell NCs are used for this study, to determine the PL properties.

Environmental effects

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