SnO
                  2
           nanocrystals in SiO2: A wide-band-gap quantum-dot system

Chiodini, N.; Палеари, А.; DiMartino, D.; Spinolo, G.

doi:10.1063/1.1503154

Cited by 131 publications

(104 citation statements)

References 14 publications

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“…The fabrication of inorganic glass-based NS films was designed after collecting detailed data on bulk materials about the possible strategies for chemically controlling the nanostructuring of sol-gel-derived inorganic glasses, specifically investigating the effects of co-doping with RE ions or fluorine precursors, as well as the effects of the oxygen partial pressure during thermally activated nanoclustering 26,52,53 . Sols were produced starting from TMOS, DBTDA in THF.…”

Section: Methodsmentioning

confidence: 99%

Fully inorganic oxide-in-oxide ultraviolet nanocrystal light emitting devices

et al. 2012

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The development of integrated photonics and lab-on-a-chip platforms for environmental and biomedical diagnostics demands ultraviolet electroluminescent materials with high mechanical, chemical and environmental stability and almost complete compatibility with existing silicon technology. Here we report the realization of fully inorganic ultraviolet lightemitting diodes emitting at 390 nm with a maximum external quantum efficiency of ~0.3%, based on sno 2 nanoparticles embedded in sio 2 thin films obtained from a solution-processed method. The fabrication involves a single deposition step onto a silicon wafer followed by a thermal treatment in a controlled atmosphere. The fully inorganic architecture ensures superior mechanical robustness and optimal chemical stability in organic solvents and aqueous solutions. The versatility of the fabrication process broadens the possibility of optimizing this strategy and extending it to other nanostructured systems for designed applications, such as active components of wearable health monitors or biomedical devices.

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Section: Methodsmentioning

confidence: 99%

Fully inorganic oxide-in-oxide ultraviolet nanocrystal light emitting devices

et al. 2012

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“…For small enough particles, a quantum confinement of excitons should take place shifting the absorbance edge to higher energies. 3 On the other hand, for degenerated materials, a blueshift given by the Burstein-Moss theory is also to be expected. However, for nondegenerated tin-oxide nanopowders with particle size between 2 and 20 nm a redshift of the absorbance band edge has already been reported.…”

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confidence: 99%

Surface states in template synthesized tin oxide nanoparticles

Cabot

Arbiol

Ferré

et al. 2004

Journal of Applied Physics

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Tin-oxide nanoparticles with controlled narrow size distributions are synthesized while physically encapsulated inside silica mesoporous templates. By means of ultraviolet-visible spectroscopy, a redshift of the optical absorbance edge is observed. Photoluminescence measurements corroborate the existence of an optical transition at 3.2 eV. The associated band of states in the semiconductor gap is present even on template-synthesized nanopowders calcined at 800°C, which contrasts with the evolution of the gap states measured on materials obtained by other methods. The gap states are thus considered to be surface localized, disappearing with surface faceting or being hidden by the surface-to-bulk ratio decrease.

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“…It is usually thought that no band-toband transition luminescence is observed due to the presence of point defects, such as oxygen vacancies. 6,7 Assuming that the maximum intensity photon energy in the PL spectra corresponds to the band gap energy, it was possible to study the effect of the particle radius on the band gap energy of the samples ͑Table I͒. This assumption is quite reasonable, since we are interested in observing the behavior of the mean particle size.…”

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confidence: 99%

Photoluminescence in quantum-confined SnO2 nanocrystals: Evidence of free exciton decay

Lee

Ribeiro

Giraldi

et al. 2004

Applied Physics Letters

248

123

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Nanocrystalline SnO2 quantum dots were synthesized at room temperature by hydrolysis reaction of SnCl2. The addition of tetrabutyl ammonium hydroxide and the use of hydrothermal treatment enabled one to obtain tin dioxide colloidal suspensions with mean particle radii ranging from 1.5 to 4.3 nm. The photoluminescent properties of the suspensions were studied. The particle size distribution was estimated by transmission electron microscopy. Assuming that the maximum intensity photon energy of the photoluminescence spectra is related to the band gap energy of the system, the size dependence of the band gap energies of the quantum-confined SnO2 particles was studied. This dependence was observed to agree very well with the weak confinement regime predicted by the effective mass model. This might be an indication that photoluminescence occurs as a result of a free exciton decay process.

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SnO 2 nanocrystals in SiO2: A wide-band-gap quantum-dot system

Cited by 131 publications

References 14 publications

Fully inorganic oxide-in-oxide ultraviolet nanocrystal light emitting devices

Fully inorganic oxide-in-oxide ultraviolet nanocrystal light emitting devices

Surface states in template synthesized tin oxide nanoparticles

Photoluminescence in quantum-confined SnO2 nanocrystals: Evidence of free exciton decay

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