Sub-nanometric metallic Au clusters as efficient Er3+ sensitizers in silica

Trave, Enrico; Mattei, Giovanni; Mazzoldi, P.; Pellegrini, Giovanni; Scian, Carlo; Maurizio, C.; Battaglin, Giancarlo

doi:10.1063/1.2266229

Cited by 75 publications

(39 citation statements)

References 18 publications

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“…The fact that the measured distance is significantly lower of the corresponding one of the metallic phase suggests the presence of metallic aggregates. In this framework, the contraction of the Tl-Tl distance is in agreement with the presence of small metallic aggregates ( [29] and refs. therein); on the other hand, the increase of the Tl-Tl distance for the 1 week exchanged sample could be likely due to an increase of the cluster size.…”

Section: Discussionsupporting

confidence: 59%

Tl ion-exchange borosilicate glass: Investigation of the Tl site by X-ray absorption spectroscopy

Maurizio¹,

d’Acapito²,

Ghibaudo

et al. 2008

Journal of Non-Crystalline Solids

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Section: Discussionsupporting

confidence: 59%

Tl ion-exchange borosilicate glass: Investigation of the Tl site by X-ray absorption spectroscopy

Maurizio¹,

d’Acapito²,

Ghibaudo

et al. 2008

Journal of Non-Crystalline Solids

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“…This assumption is also supported by the observation of a luminescence enhancement of Er 3þ in silicate glasses containing sub-nanometric, non-plasmonic gold clusters. [15] Apparently, most of the aforementioned experiments suffer from the simultaneous appearance of ions, atoms, small particles and larger nanoparticles, which makes unambigous conclusions difficult if not impossible. Our group has just developed a technique to produce gold and silver particles in soda-lime silicate glasses by synchrotron X-ray activation.…”

mentioning

confidence: 99%

Plasmonic Enhancement or Energy Transfer? On the Luminescence of Gold‐, Silver‐, and Lanthanide‐Doped Silicate Glasses and Its Potential for Light‐Emitting Devices

Eichelbaum

Rademann

2009

Adv Funct Materials

298

184

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With the technique of synchrotron X‐ray activation, molecule‐like, non‐plasmonic gold and silver particles in soda‐lime silicate glasses can be generated. The luminescence energy transfer between these species and lanthanide(III) ions is studied. As a result, a significant lanthanide luminescence enhancement by a factor of up to 250 under non‐resonant UV excitation is observed. The absence of a distinct gold and silver plasmon resonance absorption, respectively, the missing nanoparticle signals in previous SAXS and TEM experiments, the unaltered luminescence lifetime of the lanthanide ions compared to the non‐enhanced case, and an excitation maximum at 300–350 nm (equivalent to the absorption range of small noble metal particles) indicate unambiguously that the observed enhancement is due to a classical energy transfer between small noble metal particles and lanthanide ions, and not to a plasmonic field enhancement effect. It is proposed that very small, molecule‐like noble metal particles (such as dimers, trimers, and tetramers) first absorb the excitation light, undergo a singlet‐triplet intersystem crossing, and finally transfer the energy to an excited multiplet state of adjacent lanthanide(III) ions. X‐ray lithographic microstructuring and excitation with a commercial UV LED show the potential of the activated glass samples as bright light‐emitting devices with tunable emission colors.

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“…For this purpose, Tick proposed that the particles size must be less than 15 nm with a narrow distribution size and high density [2]. There are reports on thin films containing semiconductor and metal nanoparticles acting as sensitizers, absorbing the incident light with a high crosssection and exciting erbium co-doped ions in the nanoparticle vicinity through energy transfer [3][4][5][6][7][8]. Here we propose for the first time to incorporate Er into oxide nanoparticles in optical fibers to improve the spectroscopic properties of erbium ions.…”

Section: Introductionmentioning

confidence: 99%

Role of CaO addition in the local order around Erbium in SiO2–GeO2–P2O5 fiber preforms

d’Acapito¹,

Maurizio²,

Paul³

et al. 2008

Materials Science and Engineering: B

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The development of materials for optical signal processing represents a major issue in present technology. In this contribution we present a study on Er-doped fiber preforms where particular attention is devoted on how the addition of CaO in the glass modifies the local environment of the rare earth. The results from photoluminescence and Extended X-ray Absorption Fine Structure (EXAFS) are compared and a clear link between the width of the emission line at 1.5 µm and the amorphous/crystalline local structure around the Er3+ ion is evidenced.Keywords: Optic fibers; EXAFS; Erbium; Nanoparticles 1. Introduction Knowledge of the environment of rare earth ions in glasses is essential for the understanding of the spectral properties of these glasses and the design of new glass compositions for photonics applications. Among the rare earths, erbium is especially interesting because the 4I13/2 − 4I15/2 transition at ≈1.54 µm coincides with the lowest attenuation window of silica glass fiber; hence, erbium doped glasses can be used to amplify attenuated signals in optical fiber telecommunication systems. While Erbium-Doped Fiber Amplifier (EDFA) was developed 20 years ago, extensive studies are still carried out to improve its properties. In particular, linear dimensions should be reduced although the severe limitations imposed by the poor rare earth solubility into silica matrix. Moreover, spectral bandwidth should be increased to improve the Wavelength Division Multiplexing (WDM) applications. To solve these problems, various approaches have been proposed namely Er-Tm co-doping [1] or Er incorporation in nanoparticles (NP). However, to be compatible with optical waveguide applications, Rayleigh scattering must be kept at a minimum. For this purpose, Tick proposed that the particles size must be less than 15 nm with a narrow distribution size and high density [2]. There are reports on thin films containing semiconductor and metal nanoparticles acting as sensitizers, absorbing the incident light with a high crosssection and exciting erbium co-doped ions in the nanoparticle vicinity through energy transfer [3][4][5][6][7][8]. Here we propose for the first time to incorporate Er into oxide nanoparticles in optical fibers to improve the spectroscopic properties of erbium ions. To our knowledge only few studies on nano-structured silica fibers were dedicated to metal ions properties [9]. In our samples, oxide nano-structures are prepared by adjusting the composition of usual modifiers in the core of the fiber. A glass with an immiscibility gap is obtained and two phases are then formed with high and low silica content. The nanoparticles are preserved when the perform is drawn into a fiber. An effective method to study the incorporation of Er in a matrix is by Extended X-ray Absorption Fine Structure (EXAFS) [10] as this technique provides quantitative information on the geometry and chemical composition of the environment of the element under study. The Er site has been successfully studied by this technique in a var...

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Sub-nanometric metallic Au clusters as efficient Er3+ sensitizers in silica

Cited by 75 publications

References 18 publications

Tl ion-exchange borosilicate glass: Investigation of the Tl site by X-ray absorption spectroscopy

Tl ion-exchange borosilicate glass: Investigation of the Tl site by X-ray absorption spectroscopy

Plasmonic Enhancement or Energy Transfer? On the Luminescence of Gold‐, Silver‐, and Lanthanide‐Doped Silicate Glasses and Its Potential for Light‐Emitting Devices

Role of CaO addition in the local order around Erbium in SiO2–GeO2–P2O5 fiber preforms

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