Visible luminescence peculiar to sintered silica nanoparticles: Spectral and decay properties

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3 Citazioni (Scopus)

Abstract

We report that the sintering at 1000 °C of silica nanoparticles an average diameter of 14 nm ) produces a transparent sample that exhibits a bright visible emission under UV excitation. The use of time resolved luminescence spectroscopy and a tunable laser source allows us to single out three contributions centered at 1.96 eV, 2.41 eV and 3.43 eV. The excitation spectra of these emissions evidence bell shaped bands consistent with transitions between localized defects’ states. For each emission we study the intensity and the lifetime in the temperature range from 300 K down to10K, thus evidencing the competition between radiative and non-radiative processes in the optical cycle of luminescent centers. The comparison with the luminescence properties of silica, both nanoparticles and bulk, points out that the observed emissions are peculiar to the sintered silica network.
Lingua originaleEnglish
pagine (da-a)123-129
Numero di pagine7
RivistaJournal of Luminescence
Volume166
Stato di pubblicazionePublished - 2015

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Luminescence
Silicon Dioxide
Nanoparticles
luminescence
silicon dioxide
nanoparticles
Optical Phenomena
decay
Laser tuning
Spectrum Analysis
Lasers
Sintering
tunable lasers
bells
Spectroscopy
excitation
sintering
Defects
Temperature
life (durability)

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

Cita questo

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title = "Visible luminescence peculiar to sintered silica nanoparticles: Spectral and decay properties",
abstract = "We report that the sintering at 1000 °C of silica nanoparticles an average diameter of 14 nm ) produces a transparent sample that exhibits a bright visible emission under UV excitation. The use of time resolved luminescence spectroscopy and a tunable laser source allows us to single out three contributions centered at 1.96 eV, 2.41 eV and 3.43 eV. The excitation spectra of these emissions evidence bell shaped bands consistent with transitions between localized defects’ states. For each emission we study the intensity and the lifetime in the temperature range from 300 K down to10K, thus evidencing the competition between radiative and non-radiative processes in the optical cycle of luminescent centers. The comparison with the luminescence properties of silica, both nanoparticles and bulk, points out that the observed emissions are peculiar to the sintered silica network.",
keywords = "Defect state, Silica nanoparticles, Sintering, Time-resolved Luminescence",
author = "Luisa Spallino and Lavinia Vaccaro and Chiara Cangialosi and Gelardi, {Franco Mario} and Marco Cannas and Cangialosi",
year = "2015",
language = "English",
volume = "166",
pages = "123--129",
journal = "Journal of Luminescence",
issn = "0022-2313",
publisher = "Elsevier",

}

TY - JOUR

T1 - Visible luminescence peculiar to sintered silica nanoparticles: Spectral and decay properties

AU - Spallino, Luisa

AU - Vaccaro, Lavinia

AU - Cangialosi, Chiara

AU - Gelardi, Franco Mario

AU - Cannas, Marco

AU - Cangialosi, null

PY - 2015

Y1 - 2015

N2 - We report that the sintering at 1000 °C of silica nanoparticles an average diameter of 14 nm ) produces a transparent sample that exhibits a bright visible emission under UV excitation. The use of time resolved luminescence spectroscopy and a tunable laser source allows us to single out three contributions centered at 1.96 eV, 2.41 eV and 3.43 eV. The excitation spectra of these emissions evidence bell shaped bands consistent with transitions between localized defects’ states. For each emission we study the intensity and the lifetime in the temperature range from 300 K down to10K, thus evidencing the competition between radiative and non-radiative processes in the optical cycle of luminescent centers. The comparison with the luminescence properties of silica, both nanoparticles and bulk, points out that the observed emissions are peculiar to the sintered silica network.

AB - We report that the sintering at 1000 °C of silica nanoparticles an average diameter of 14 nm ) produces a transparent sample that exhibits a bright visible emission under UV excitation. The use of time resolved luminescence spectroscopy and a tunable laser source allows us to single out three contributions centered at 1.96 eV, 2.41 eV and 3.43 eV. The excitation spectra of these emissions evidence bell shaped bands consistent with transitions between localized defects’ states. For each emission we study the intensity and the lifetime in the temperature range from 300 K down to10K, thus evidencing the competition between radiative and non-radiative processes in the optical cycle of luminescent centers. The comparison with the luminescence properties of silica, both nanoparticles and bulk, points out that the observed emissions are peculiar to the sintered silica network.

KW - Defect state

KW - Silica nanoparticles

KW - Sintering

KW - Time-resolved Luminescence

UR - http://hdl.handle.net/10447/166027

M3 - Article

VL - 166

SP - 123

EP - 129

JO - Journal of Luminescence

JF - Journal of Luminescence

SN - 0022-2313

ER -