Phonon coupling of non-bridging oxygen hole center with the silica environment: Temperature dependence of the 1.9eV emission spectra

Vaccaro, L.; Cannas, Marco; Boscaino, R.

doi:10.1016/j.jlumin.2007.11.076

Cited by 22 publications

(9 citation statements)

References 20 publications

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“…It is known that the asymmetric PL and PLE spectra are accounted for by the weak electron-phonon coupling characteristics of the NBOHC. As a consequence, these bands can be described by a pekarian curve, which is the convolution of a gaussian and a poissonian and, under the straightforward model of coupling with a single mode of mean Huang-Rhys factor S and effective frequency ω, the lineshape I(E) can be approximated by the function [16]:…”

Section: Discussionmentioning

confidence: 99%

Origin of the visible absorption in radiation-resistant optical fibers

Morana¹,

Cannas²,

Girard³

et al. 2013

Opt. Mater. Express

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Abstract:In this work we investigated the point defects at the origin of the degradation of radiation-tolerant optical fibers used in the visible part of the spectrum for plasma diagnostics in radiation environments. For this aim, the effects of γ-ray irradiation up to the dose of 10 MGy(SiO 2 ) and post-irradiation thermal annealing at 550 • C were studied for a Fluorinedoped fiber. An absorption peaking around 2 eV is mainly responsible for the measured radiation-induced losses, its origin being currently debated in the literature. On the basis of the unchanging shape of this band with the radiation dose, its correlation with the 1.9 eV photoluminescent band and the thermal treatment results we assign the asymmetric absorption around 2 eV to an unique defect, the NBOHC, instead of a set of various defects.

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Section: Discussionmentioning

confidence: 99%

Origin of the visible absorption in radiation-resistant optical fibers

Morana¹,

Cannas²,

Girard³

et al. 2013

Opt. Mater. Express

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“…As evidenced above, these two subbands are not observed in the PL spectra of the bulk NBOHC. A straightforward explanation can be derived by the different influence of the bulk and surface silica network on the PL broadening, both homogenous due to the phonon coupling 34 and inhomogeneous due to the disordered silica network. The second contribution can be singled out by site-selective techniques; 22,35 in the bulk NBOHC it results in a Gaussian curve with ͑FWHM͒ inh ϳ 0.08 eV, it is large enough to prevent the spectral resolution of the two subbands.…”

Section: Discussionmentioning

confidence: 99%

Luminescence of the surface nonbridging oxygen hole center in silica: Spectral and decay properties

et al. 2008

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We investigated the red luminescence in a porous film of silica nanoparticles, originating from surface nonbridging oxygen hole centers. The excitation spectrum was measured from 1.8 to 8.0 eV by a tunable laser system and a synchrotron radiation source; this spectrum evidences a peak at 2.0 eV, nearly overlapping with\ud the emission, and an ultraviolet broadband with peaks at 4.8 and 6.0 eV. The emission is characterized by a spectrum with two subbands split by 0.07 eV, its decay occurs with lifetime longer than 30 microsec and undergoes\ud a thermal quenching by a factor aboout 2 with increasing temperature from 10 to 290 K. The optical characteristics of surface and bulk centers are discussed on the basis of the reported experimental results and quantum\ud chemical calculations

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“…In this case, the problem can be solved using numerical methods by choosing different variants of the distribu tion function. In particular, Vaccaro et al [11] used the…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

Low-temperature luminescence of lead silicate glass

Zatsepin¹,

Kukharenko²,

Бунтов³

et al. 2010

Glass Phys Chem

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Abstract-The temperature quenching of intrinsic luminescence of a lead silicate glass of the 20PbO ⋅ 80SiO 2 composition has been investigated in the temperature range 7-200 K. It has been found that the temperature behavior of the intensity of intrinsic luminescence does not obey the well known Mott's law for intracenter quenching of luminescence but is adequately described by the empirical Street's formula. It has been dem onstrated that, with allowance made for the disorder of the atomic structure, the experimental temperature dependence of the luminescence intensity of the glass can be represented as a superposition of Mott's depen dences for an ensemble of local luminescence centers. The obtained distribution of luminescence centers over the activation energies of quenching has an asymmetric form with prevailing low energy states. It has been assumed that this feature has a general character and, at low temperatures, determines the specificity of the processes of nonradiative relaxation of the electronic subsystem for many oxide glasses.

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Phonon coupling of non-bridging oxygen hole center with the silica environment: Temperature dependence of the 1.9eV emission spectra

Cited by 22 publications

References 20 publications

Origin of the visible absorption in radiation-resistant optical fibers

Origin of the visible absorption in radiation-resistant optical fibers

Luminescence of the surface nonbridging oxygen hole center in silica: Spectral and decay properties

Low-temperature luminescence of lead silicate glass

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