White-light photoluminescence and photoactivation in cadmium sulfide embedded in mesoporous silicon dioxide templates studied by confocal laser scanning microscopy

[Display omitted] •Cadmium sulfide (CdS) embedded into SBA-15 and SBA-16 mesoporous silica templates.•Cadmium thioglycolate precursor as a source of mesoporous CdS.•Broad photoluminescence (PL) over the entire visible range and enhanced PL intensity.•SiO2@CdS composites undergo photoactivation under...

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Bibliographic Details
Published in:Journal of colloid and interface science 2013-10, Vol.407, p.47-59
Main Authors: Pellicer, E., Rossinyol, E., Rosado, M., Guerrero, M., Domingo-Roca, R., Suriñach, S., Castell, O., Baró, M.D., Roldán, M., Sort, J.
Format: Article
Language:English
Subjects:
Cadmium
Cadmium sulfides
CdS
Chemistry
Colloidal state and disperse state
Confocal laser scanning microscopy
Exact sciences and technology
General and physical chemistry
Illumination
Lighting
Mesoporous silica
Nanocasting
nanocomposites
nanocrystals
Nanostructure
Photoactivation
Photoluminescence
Porous materials
SBA-15
SBA-16
silica
Silicon dioxide
Three dimensional
white light
White-light photoluminescence
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Summary:[Display omitted] •Cadmium sulfide (CdS) embedded into SBA-15 and SBA-16 mesoporous silica templates.•Cadmium thioglycolate precursor as a source of mesoporous CdS.•Broad photoluminescence (PL) over the entire visible range and enhanced PL intensity.•SiO2@CdS composites undergo photoactivation under continuous UV illumination. SBA-15 and SBA-16 silica templates have been infiltrated with CdS by means of nanocasting using a hybrid precursor. The morphology and structure of both the SiO2@CdS nanocomposites and the silica-free CdS replicas have been characterized. The three-dimensional nanocrystalline CdS networks embedded in SBA-15 and SBA-16 silica templates exhibit broad photoluminescence (PL) spectra over the entire visible range, together with enhanced PL intensity compared to silica-free CdS replicas. These effects result from the role silica plays in passivating the surface of the CdS mesostructures. Furthermore, photoactivation is eventually observed during continuous illumination because of both structural and chemical surface modifications. Owing to this combination of properties, these materials could be appealing for solid-state lighting, where ultra-bright near-white PL emission is indispensable.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2013.06.022