Ultraviolet photoluminescence of porous silica

Chiodini, N.; Meinardi, F.; Morazzoni, Franca; Палеари, А.; Scotti, Roberto; Martino, Daniela Di

doi:10.1063/1.126631

Cited by 63 publications

(49 citation statements)

References 17 publications

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“…16-19 had a FWHM ജ0.5 eV. Strong UV emissions at ϳ3.7-3.8 eV have also been observed in porous silica samples; 30,31 however, their spectral widths ജ0.5 eV are also much larger than that observed in this study ͑ϳ0.1 eV͒.…”

Section: Discussioncontrasting

confidence: 38%

Ultraviolet emission from porous silicon photosynthesized in aqueous alkali fluoride solutions

Uchida

Tomioka

Adachi

2006

Journal of Applied Physics

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Stable ultraviolet ͑UV͒ photoluminescence ͑PL͒ has been observed at room temperature in porous silicon ͑PSi͒ fabricated by photoetching in aqueous alkali fluoride solutions. The aqueous solutions used are 1 M NaF and 1 M KF. They give an alkaline reaction caused by partial hydrolysis. The PL peaks at ϳ3.3 eV have a full width at half maximum of ϳ0.1 eV, which is much smaller than those reported previously ͑ജ0.5 eV͒. Spectral analyses suggest that both quantum confinement and surface passivation effects enable the observation of UV emission in NaF-and KF-prepared PSi samples.

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Section: Discussioncontrasting

confidence: 38%

Ultraviolet emission from porous silicon photosynthesized in aqueous alkali fluoride solutions

Uchida

Tomioka

Adachi

2006

Journal of Applied Physics

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“…[15][16][17] Beside the PL bands in the visible range, few articles have dealt with ultraviolet ͑UV͒ emissions observed in silicon oxide films, oxidized porous silicon, and mesoporous silica. [18][19][20][21][22][23] In a recent study focused on the emission peaked at about 3.7 eV, [22][23][24] we reported experimental evidence for the presence of two distinct surface centers emitting in the UV range whose spectral features are summarized by the schematic picture shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Thermal quenching properties of ultraviolet emitting centers in mesoporous silica

2007

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We report an investigation of the thermal quenching properties of the ultraviolet emission observed in mesoporous silica. The optical emission is due to the contribution of two emitting centers at 3.7 and 4.0 eV and previously assigned to strong-and weak-interacting silanols ͑Si-OH͒ located at the surface of the material. We investigate the temperature dependence of the lifetimes and the photoluminescence amplitudes of the two centers, in the 10-300 K range, by exciting in the ultraviolet and vacuum ultraviolet region with synchrotron radiation. The analysis of the lifetimes, carried out in the framework of a biexponential model at all the temperatures and excitations, and of the temperature dependence of the photoluminescence amplitude displayed different quenching properties in samples with different pore diameters. In addition, the thermal dependence of the photoluminescence amplitudes shows a distribution of the activation energy as a function of the emission energy in samples with smaller pore diameter.

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“…Interestingly, visible fluorescence was reported for diatoms before, but in some cases with other spectral characteristics [19][20][21][22][23]. The origin of this fluorescence is not clear but can in principle either arise from the organic matrix that may contain heterocyclic moieties [3] or from surface states in mesoporous silica [24,25].…”

Section: Variation Of the Amino Function In Rhodamine Stainsmentioning

confidence: 97%

Staining diatoms with rhodamine dyes: control of emission colour in photonic biocomposites

Kucki

Fuhrmann‐Lieker

2011

J. R. Soc. Interface.

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The incorporation of rhodamine dyes in the cell wall of diatoms Coscinodiscus granii and Coscinodiscus wailesii for the production of luminescent hybrid nanostructures is investigated. By systematic variation of the substitution pattern of the rhodamine core, we found that carbonic acids are considerably better suited than esters because of their physiological compatibility. The amino substitution pattern that controls the optical properties of the chromophore has no critical influence on dye uptake and incorporation, thus a variety of biocomposites with different emission maxima can be prepared. Applications in biomineralization studies as well as in materials science are envisioned.

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Ultraviolet photoluminescence of porous silica

Cited by 63 publications

References 17 publications

Ultraviolet emission from porous silicon photosynthesized in aqueous alkali fluoride solutions

Ultraviolet emission from porous silicon photosynthesized in aqueous alkali fluoride solutions

Thermal quenching properties of ultraviolet emitting centers in mesoporous silica

Staining diatoms with rhodamine dyes: control of emission colour in photonic biocomposites

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