Visible and ultraviolet emission of porous silica excited by synchrotron radiation

Anedda, Alberto; Carbonaro, Carlo Maria; Clemente, Francesca; Corpino, Riccardo; Ricci, Pier Carlo

doi:10.1016/j.jnoncrysol.2005.04.039

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…These effects have been already reported for dye molecules hosted in porous glass materials and are related to surface polarity effect and restriction on the mobility of the molecules. 1,[34][35][36] It is interesting to note that class II samples present a PL band larger at larger wavelength with respect to class I samples.…”

Section: Resultsmentioning

confidence: 99%

Hybrid Materials for Solid-State Dye Laser Applications

et al. 2006

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The quest for a solid-state tunable dye laser can be satisfied by sol-gel prepared organic-inorganic hybrids. A photostability study of porous silica-Rhodamine 6G hybrids prepared via a sol-gel method is presented. The dye molecules can be incorporated into the silica matrix by forming weak or covalent bonds (hybrids of classes I and II, respectively). New class II samples and traditional class I materials prepared by the pre-doping method were synthesized. Samples were characterized by photoluminescence measurements to compare the emission properties and the photostability of the samples. The decay of the fluorescence signal as the cumulative excitation energy increases is reported and interpreted by hypothesizing that the dye molecules can be hosted in different surroundings within the porous glass matrix. The reported photoluminescence and photobleaching features indicate the class II samples as good candidates for solid-state dye lasers.

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Section: Resultsmentioning

confidence: 99%

Hybrid Materials for Solid-State Dye Laser Applications

et al. 2006

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“…This band shows a composite time decay with a fast component comparable to that of the 4.0-eV band. 31 The blue band largely overlaps the 3.7-eV band, especially in the case of large-pore-diameter samples where its activation energy is of about 60 meV. When monitoring the emission at 3.7 eV the contribution of the blue band and that of the 4.0-eV band are comparable and the former increases as the temperature decreases.…”

Section: ͑3͒mentioning

confidence: 92%

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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“…The band around 335 nm (3.7 eV) could not be clearly identified to date. Only a few publications have reported such an emission band in Si-SiO 2 nanoclusters and in porous silica, which were related to the singlet-singlet luminescence (S 0 → S 1 ) of different kinds of ODCs [26]. In fluorescence spectra, we did not observe the typical emission band of NBOHC center centered at 650 nm (1.90 eV), which was restricted by the fluorescence spectrometer we used.…”

Section: Fluorescence Spectramentioning

confidence: 63%

Laser-Induced Point Defects in Fused Silica Irradiated by UV Laser in Vacuum

Zhou

Huang

et al. 2014

Advances in Condensed Matter Physics

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High-purity fused silica irradiated by third harmonic of the Nd:YAG laser in vacuum with different laser pulse parameters was studied experimentally. Laser-induced defects are investigated by UV spectroscopy, and fluorescence spectra and correlated to the structural modifications in the glass matrix through Raman spectroscopy. Results show that, for laser fluence below laser-induced damage threshold (LIDT), the absorbance and intensity of fluorescence bands increase with laser energies and/or number of laser pulses, which indicates that laser-induced defects are enhanced by laser energies and/or number of laser pulses in vacuum. The optical properties of these point defects were discussed in detail.

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Visible and ultraviolet emission of porous silica excited by synchrotron radiation

Cited by 7 publications

References 21 publications

Hybrid Materials for Solid-State Dye Laser Applications

Hybrid Materials for Solid-State Dye Laser Applications

Thermal quenching properties of ultraviolet emitting centers in mesoporous silica

Laser-Induced Point Defects in Fused Silica Irradiated by UV Laser in Vacuum

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